Yahoo Protocol Provider Implementation

33 files changed, 5719 insertions, 14 deletions

diff --git a/src/net/java/sip/communicator/impl/gui/resources/protocols/yahoo/yahoo16x16-connecting.gif b/src/net/java/sip/communicator/impl/gui/resources/protocols/yahoo/yahoo16x16-connecting.gif
new file mode 100644
index 0000000..4f07cb7
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/gui/resources/protocols/yahoo/yahoo16x16-connecting.gif
diff --git a/src/net/java/sip/communicator/impl/gui/utils/Constants.java b/src/net/java/sip/communicator/impl/gui/utils/Constants.java
index 8cda9b4..3b9b706 100755
--- a/src/net/java/sip/communicator/impl/gui/utils/Constants.java
+++ b/src/net/java/sip/communicator/impl/gui/utils/Constants.java
@@ -461,7 +461,7 @@ public class Constants {
         }
         else if (protocolName.equals(Constants.YAHOO)) {
             return ImageLoader.getAnimatedImage(
-                    ImageLoader.ICQ_CONNECTING);
+                    ImageLoader.YAHOO_CONNECTING);
         }
         else if (protocolName.equals(Constants.JABBER)) {
             return ImageLoader.getAnimatedImage(
diff --git a/src/net/java/sip/communicator/impl/gui/utils/ImageLoader.java b/src/net/java/sip/communicator/impl/gui/utils/ImageLoader.java
index c82e869..bd70484 100644
--- a/src/net/java/sip/communicator/impl/gui/utils/ImageLoader.java
+++ b/src/net/java/sip/communicator/impl/gui/utils/ImageLoader.java
@@ -802,6 +802,11 @@ public class ImageLoader {
      * The Yahoo logo 16x16 icon.
      */
     public static final ImageID YAHOO_LOGO = new ImageID("YAHOO_LOGO");
+    
+    /**
+     * The ICQ "connecting" 16x16 animated icon.
+     */
+    public static final ImageID YAHOO_CONNECTING = new ImageID("YAHOO_CONNECTING");
 
     /**
      * The Jabber logo 32x32 icon.
diff --git a/src/net/java/sip/communicator/impl/gui/utils/images.properties b/src/net/java/sip/communicator/impl/gui/utils/images.properties
index c84f346..5009060 100644
--- a/src/net/java/sip/communicator/impl/gui/utils/images.properties
+++ b/src/net/java/sip/communicator/impl/gui/utils/images.properties
@@ -109,6 +109,7 @@ AIM_32x32=net/java/sip/communicator/impl/gui/resources/protocols/aim/Aim.png
 AIM_LOGO=net/java/sip/communicator/impl/gui/resources/protocols/aim/Aim16.png
 YAHOO_32x32=net/java/sip/communicator/impl/gui/resources/protocols/yahoo/Yahoo.png
 YAHOO_LOGO=net/java/sip/communicator/impl/gui/resources/protocols/yahoo/Yahoo16.png
+YAHOO_CONNECTING=net/java/sip/communicator/impl/gui/resources/protocols/yahoo/yahoo16x16-connecting.gif
 JABBER_32x32=net/java/sip/communicator/impl/gui/resources/protocols/jabber/Jabber2.png
 JABBER_CONNECTING=net/java/sip/communicator/impl/gui/resources/protocols/jabber/jabber16x16-connecting.gif
 JABBER_LOGO=net/java/sip/communicator/impl/gui/resources/protocols/jabber/Jabber16.png
diff --git a/src/net/java/sip/communicator/impl/protocol/msn/ServerStoredContactListMsnImpl.jbx b/src/net/java/sip/communicator/impl/protocol/msn/ServerStoredContactListMsnImpl.jbx
deleted file mode 100644
index a6a1c55..0000000
--- a/src/net/java/sip/communicator/impl/protocol/msn/ServerStoredContactListMsnImpl.jbx
+++ /dev/null
@@ -1,12 +0,0 @@
-[PropertyInfo]
-contactListModManager,net.java.sip.communicator.impl.protocol.msn.EventManager,false,false, , ,false,<default>
-messenger,net.sf.jml.MsnMessenger,false,false, , ,false,<default>
-msnProvider,net.java.sip.communicator.impl.protocol.msn.ProtocolProviderServiceMsnImpl,false,false, , ,false,<default>
-parentOperationSet,net.java.sip.communicator.impl.protocol.msn.OperationSetPersistentPresenceMsnImpl,false,false, , ,false,<default>
-rootGroup,net.java.sip.communicator.service.protocol.ContactGroup,false,false, , ,true,<default>
-serverStoredGroupListeners,java.util.Vector,false,false, , ,false,<default>
-[IconNames]
-
-
-
-
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/AbstractContactGroupYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/AbstractContactGroupYahooImpl.java
new file mode 100644
index 0000000..a4d409d
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/AbstractContactGroupYahooImpl.java
@@ -0,0 +1,29 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import net.java.sip.communicator.service.protocol.*;
+
+/**
+ * The Yahoo implementation of the service.protocol.ContactGroup interface. There
+ * are two types of groups possible here. <tt>RootContactGroupYahooImpl</tt>
+ * which is the root node of the ContactList itself and
+ * <tt>ContactGroupYahooImpl</tt> which represents standard groups. The
+ * reason for having those 2 is that generally, Yahoo groups may not contain
+ * subgroups. A contact list on the other hand may not directly contain buddies.
+ *
+ *
+ * The reason for having an abstract class is only - being able to esily
+ * recognize our own (Yahoo) contacts.
+ * @author Damian Minkov
+ */
+public abstract class AbstractContactGroupYahooImpl
+    implements ContactGroup
+{
+
+
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/ContactGroupYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/ContactGroupYahooImpl.java
new file mode 100644
index 0000000..6c55018
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/ContactGroupYahooImpl.java
@@ -0,0 +1,473 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.util.*;
+
+import net.java.sip.communicator.service.protocol.*;
+import net.java.sip.communicator.util.*;
+import ymsg.network.*;
+
+/**
+ * The Yahoo implementation of the ContactGroup interface. Intances of this class
+ * (contrary to <tt>RootContactGroupYahooImpl</tt>) may only contain buddies
+ * and cannot have sub groups. Note that instances of this class only use the
+ * corresponding smack source group for reading their names and only
+ * initially fill their <tt>buddies</tt> <tt>java.util.List</tt> with
+ * the ContactYahooImpl objects corresponding to those contained in the source
+ * group at the moment it is being created. They would, however, never try to
+ * sync or update their contents ulteriorly. This would have to be done through
+ * the addContact()/removeContact() methods.
+ * The content of buddies is created on creating of the group and when the smack
+ * source group is changed.
+ *
+ * @author Damian Minkov
+ */
+public class ContactGroupYahooImpl
+    extends AbstractContactGroupYahooImpl
+{
+    private static final Logger logger =
+        Logger.getLogger(ContactGroupYahooImpl.class);
+
+    private List buddies = new LinkedList();
+    private boolean isResolved = false;
+
+    /**
+     * The Yahoo Group corresponding to this contact group.
+     */
+    private YahooGroup yahooGroup = null;
+
+    /**
+     * a list that would always remain empty. We only use it so that we're able
+     * to extract empty iterators
+     */
+    private List dummyGroupsList = new LinkedList();
+    
+    private String tempId = null;
+
+    private ServerStoredContactListYahooImpl ssclCallback = null;
+
+    /**
+     * Creates an Yahoo group using the specified <tt>YahooGroup</tt> as
+     * a source. The newly created group will always return the name of the
+     * underlying RosterGroup and would thus automatically adapt to changes.
+     * It would, however, not receive or try to poll for modifications of the
+     * buddies it contains and would therefore have to be updated manually by
+     * ServerStoredContactListImpl update will only be done if source group
+     * is changed.
+
+     * @param yahooGroup the Yahoo Group correspoinding to the group
+     * @param groupMembers the group members that we should add to the group.
+     * @param ssclCallback a callback to the server stored contact list
+     * we're creating.
+     * @param isResolved a boolean indicating whether or not the group has been
+     * resolved against the server.
+     */
+    ContactGroupYahooImpl(
+                        YahooGroup yahooGroup,
+                        Vector groupMembers,
+                        ServerStoredContactListYahooImpl ssclCallback,
+                        boolean isResolved)
+    {
+        this.yahooGroup = yahooGroup;
+        this.isResolved = isResolved;
+        this.ssclCallback = ssclCallback;
+
+        Iterator iter = groupMembers.iterator();
+        while(iter.hasNext())
+        {
+            addContact(
+                new ContactYahooImpl(
+                (YahooUser)iter.next(), 
+                ssclCallback, true, true) );
+        }
+    }
+    
+    ContactGroupYahooImpl(
+        String id,
+        ServerStoredContactListYahooImpl ssclCallback)
+    {
+        this.tempId = id;
+        this.isResolved = false;
+        this.ssclCallback = ssclCallback;
+    }
+
+
+    /**
+     * Returns the number of <tt>Contact</tt> members of this
+     * <tt>ContactGroup</tt>
+     *
+     * @return an int indicating the number of <tt>Contact</tt>s,
+     *   members of this <tt>ContactGroup</tt>.
+     */
+    public int countContacts()
+    {
+        return buddies.size();
+    }
+
+    /**
+     * Returns a reference to the root group which in Yahoo is the parent of
+     * any other group since the protocol does not support subgroups.
+     * @return a reference to the root group.
+     */
+    public ContactGroup getParentContactGroup()
+    {
+        return ssclCallback.getRootGroup();
+    }
+
+    /**
+     * Adds the specified contact at the specified position.
+     * @param contact the new contact to add to this group
+     * @param index the position where the new contact should be added.
+     */
+    void addContact(int index, ContactYahooImpl contact)
+    {
+        buddies.add(index, contact);
+    }
+
+    /**
+     * Adds the specified contact to the end of this group.
+     * @param contact the new contact to add to this group
+     */
+    void addContact(ContactYahooImpl contact)
+    {
+        addContact(countContacts(), contact);
+    }
+
+
+    /**
+     * Removes the specified contact from this contact group
+     * @param contact the contact to remove.
+     */
+    void removeContact(ContactYahooImpl contact)
+    {
+        removeContact(buddies.indexOf(contact));
+    }
+
+    /**
+     * Removes the contact with the specified index.
+     * @param index the index of the cntact to remove
+     */
+    void removeContact(int index)
+    {
+        buddies.remove(index);
+    }
+
+    /**
+     * Removes all buddies in this group and reinsterts them as specified
+     * by the <tt>newOrder</tt> param. Contacts not contained in the
+     * newOrder list are left at the end of this group.
+     *
+     * @param newOrder a list containing all contacts in the order that is
+     * to be applied.
+     *
+     */
+    void reorderContacts(List newOrder)
+    {
+        buddies.removeAll(newOrder);
+        buddies.addAll(0, newOrder);
+    }
+
+    /**
+     * Returns an Iterator over all contacts, member of this
+     * <tt>ContactGroup</tt>.
+     *
+     * @return a java.util.Iterator over all contacts inside this
+     *   <tt>ContactGroup</tt>. In case the group doesn't contain any
+     * memebers it will return an empty iterator.
+     */
+    public Iterator contacts()
+    {
+        return buddies.iterator();
+    }
+
+    /**
+     * Returns the <tt>Contact</tt> with the specified index.
+     *
+     * @param index the index of the <tt>Contact</tt> to return.
+     * @return the <tt>Contact</tt> with the specified index.
+     */
+    public Contact getContact(int index)
+    {
+        return (ContactYahooImpl) buddies.get(index);
+    }
+
+    /**
+     * Returns the <tt>Contact</tt> with the specified address or
+     * identifier.
+     * @param id the addres or identifier of the <tt>Contact</tt> we are
+     * looking for.
+     * @return the <tt>Contact</tt> with the specified id or address.
+     */
+    public Contact getContact(String id)
+    {
+        return this.findContact(id);
+    }
+
+    /**
+     * Returns the name of this group.
+     * @return a String containing the name of this group.
+     */
+    public String getGroupName()
+    {
+        if(isResolved)
+            return yahooGroup.getName();
+        else
+            return tempId;
+    }
+
+    /**
+     * Determines whether the group may contain subgroups or not.
+     *
+     * @return always false since only the root group may contain subgroups.
+     */
+    public boolean canContainSubgroups()
+    {
+        return false;
+    }
+
+    /**
+     * Returns the subgroup with the specified index (i.e. always null since
+     * this group may not contain subgroups).
+     *
+     * @param index the index of the <tt>ContactGroup</tt> to retrieve.
+     * @return always null
+     */
+    public ContactGroup getGroup(int index)
+    {
+        return null;
+    }
+
+    /**
+     * Returns the subgroup with the specified name.
+     * @param groupName the name of the <tt>ContactGroup</tt> to retrieve.
+     * @return the <tt>ContactGroup</tt> with the specified index.
+     */
+    public ContactGroup getGroup(String groupName)
+    {
+        return null;
+    }
+
+    /**
+     * Returns an empty iterator. Subgroups may only be present in the root
+     * group.
+     *
+     * @return an empty iterator
+     */
+    public Iterator subgroups()
+    {
+        return dummyGroupsList.iterator();
+    }
+
+    /**
+     * Returns the number of subgroups contained by this group, which is
+     * always 0 since sub groups in the protocol may only be contained
+     * by the root group - <tt>RootContactGroupImpl</tt>.
+     * @return a 0 int.
+     */
+    public int countSubgroups()
+    {
+        return 0;
+    }
+
+    /**
+     * Returns a hash code value for the object, which is actually the hashcode
+     * value of the groupname.
+     *
+     * @return  a hash code value for this ContactGroup.
+     */
+    public int hashCode()
+    {
+        return getGroupName().hashCode();
+    }
+
+    /**
+     * Indicates whether some other object is "equal to" this group.
+     *
+     * @param   obj   the reference object with which to compare.
+     * @return  <tt>true</tt> if this object is the same as the obj
+     *          argument; <tt>false</tt> otherwise.
+     */
+    public boolean equals(Object obj)
+    {
+        if(    obj == this )
+            return true;
+
+        if (obj == null
+            || !(obj instanceof ContactGroupYahooImpl) )
+               return false;
+
+        if(!((ContactGroup)obj).getGroupName().equals(getGroupName()))
+            return false;
+
+        //since Yahoo does not support having two groups with the same name
+        // at this point we could bravely state that the groups are the same
+        // and not bother to compare buddies. (gotta check that though)
+        return true;
+    }
+
+    /**
+     * Returns the protocol provider that this group belongs to.
+     * @return a regerence to the ProtocolProviderService instance that this
+     * ContactGroup belongs to.
+     */
+    public ProtocolProviderService getProtocolProvider()
+    {
+        return this.ssclCallback.getParentProvider();
+    }
+
+    /**
+     * Returns a string representation of this group, in the form
+     * YahooGroup.GroupName[size]{ buddy1.toString(), buddy2.toString(), ...}.
+     * @return  a String representation of the object.
+     */
+    public String toString()
+    {
+        StringBuffer buff = new StringBuffer("YahooGroup.");
+        buff.append(getGroupName());
+        buff.append(", childContacts="+countContacts()+":[");
+
+        Iterator contacts = contacts();
+        while (contacts.hasNext())
+        {
+            ContactYahooImpl contact = (ContactYahooImpl) contacts.next();
+            buff.append(contact.toString());
+            if(contacts.hasNext())
+                buff.append(", ");
+        }
+        return buff.append("]").toString();
+    }
+
+    /**
+     * Returns the contact encapsulating with the spcieified name or
+     * null if no such contact was found.
+     *
+     * @param id the id for the contact we're looking for.
+     * @return the <tt>ContactYahooImpl</tt> corresponding to the specified
+     * screnname or null if no such contact existed.
+     */
+    ContactYahooImpl findContact(String id)
+    {
+        Iterator contacts = contacts();
+        while (contacts.hasNext())
+        {
+            ContactYahooImpl item = (ContactYahooImpl) contacts.next();
+            if(item.getAddress().equals(id))
+                return item;
+        }
+        return null;
+    }
+
+    /**
+     * Determines whether or not this contact group is being stored by the
+     * server. Non persistent contact groups exist for the sole purpose of
+     * containing non persistent contacts.
+     * @return true if the contact group is persistent and false otherwise.
+     */
+    public boolean isPersistent()
+    {
+        return true;
+    }
+
+    /**
+     * Returns null as no persistent data is required and the contact address is
+     * sufficient for restoring the contact.
+     * <p>
+     * @return null as no such data is needed.
+     */
+    public String getPersistentData()
+    {
+        return null;
+    }
+
+    /**
+     * Determines whether or not this contact group has been resolved against
+     * the server. Unresolved group are used when initially loading a contact
+     * list that has been stored in a local file until the presence operation
+     * set has managed to retrieve all the contact list from the server and has
+     * properly mapped contacts and groups to their corresponding on-line
+     * buddies.
+     * @return true if the contact has been resolved (mapped against a buddy)
+     * and false otherwise.
+     */
+    public boolean isResolved()
+    {
+        return isResolved;
+    }
+
+    /**
+     * Resolve this contact group against the specified group
+     * @param yahooGroup the server stored group
+     */
+    void setResolved(YahooGroup yahooGroup)
+    {
+        if(isResolved)
+            return;
+
+        this.isResolved = true;
+
+        this.yahooGroup = yahooGroup;
+
+        Vector contacts = yahooGroup.getMembers();
+        Iterator iter = contacts.iterator();
+        while(iter.hasNext())
+        {
+            YahooUser item = (YahooUser)iter.next();
+
+            ContactYahooImpl contact =
+                ssclCallback.findContactById(item.getId());
+            if(contact != null)
+            {
+                contact.setResolved(item);
+
+                ssclCallback.fireContactResolved(this, contact);
+            }
+            else
+            {
+                ContactYahooImpl newContact =
+                    new ContactYahooImpl(item, ssclCallback, true, true);
+                addContact(newContact);
+
+                ssclCallback.fireContactAdded(this, newContact);
+            }
+        }
+    }
+
+    /**
+     * Returns a <tt>String</tt> that uniquely represnets the group. In this we
+     * use the name of the group as an identifier. This may cause problems
+     * though, in clase the name is changed by some other application between
+     * consecutive runs of the sip-communicator.
+     *
+     * @return a String representing this group in a unique and persistent
+     * way.
+     */
+    public String getUID()
+    {
+        return getGroupName();
+    }
+
+    /**
+     * The source group we are encapsulating
+     * @return YahooGroup
+     */
+    YahooGroup getSourceGroup()
+    {
+        return yahooGroup;
+    }
+
+    /**
+     * Change the source group
+     * change the buddies
+     *
+     * @param newGroup YahooGroup
+     */
+    void setSourceGroup(YahooGroup newGroup)
+    {
+        this.yahooGroup = newGroup;
+    }
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/ContactYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/ContactYahooImpl.java
new file mode 100644
index 0000000..cef5594
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/ContactYahooImpl.java
@@ -0,0 +1,278 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import net.java.sip.communicator.service.protocol.*;
+import net.java.sip.communicator.service.protocol.yahooconstants.*;
+import ymsg.network.*;
+
+/**
+ * The Yahoo implementation of the service.protocol.Contact interface.
+ * @author Damian Minkov
+ */
+public class ContactYahooImpl
+    implements Contact
+{
+    private YahooUser contact = null;
+    private boolean isLocal = false;
+    private byte[] image = null;
+    private PresenceStatus status = YahooStatusEnum.OFFLINE;
+    private ServerStoredContactListYahooImpl ssclCallback = null;
+    private boolean isPersistent = false;
+    private boolean isResolved = false;
+    
+    private String tempId = null;
+
+    /**
+     * Creates an YahooContactImpl
+     * @param contact the contact object that we will be encapsulating.
+     * @param ssclCallback a reference to the ServerStoredContactListImpl
+     * instance that created us.
+     * @param isPersistent determines whether this contact is persistent or not.
+     * @param isResolved specifies whether the contact has been resolved against
+     * the server contact list
+     */
+    ContactYahooImpl(
+                   YahooUser contact,
+                   ServerStoredContactListYahooImpl ssclCallback,
+                   boolean isPersistent,
+                   boolean isResolved)
+    {
+        this.contact = contact;
+        this.isLocal = isLocal;
+        this.ssclCallback = ssclCallback;
+        this.isPersistent = isPersistent;
+        this.isResolved = isResolved;
+    }
+    
+    ContactYahooImpl(
+        String id,
+        ServerStoredContactListYahooImpl ssclCallback,
+        boolean isPersistent)
+    {
+        this.tempId = id;
+        this.isLocal = isLocal;
+        this.ssclCallback = ssclCallback;
+        this.isPersistent = isPersistent;
+        this.isResolved = false;
+    }
+
+    /**
+     * Returns the Yahoo Userid of this contact
+     * @return the Yahoo Userid of this contact
+     */
+    public String getAddress()
+    {
+        if(isResolved)
+            return contact.getId();
+        else 
+            return tempId;
+    }
+
+    /**
+     * Determines whether or not this Contact instance represents the user used
+     * by this protocol provider to connect to the service.
+     *
+     * @return true if this Contact represents us (the local user) and false
+     * otherwise.
+     */
+    public boolean isLocal()
+    {
+        return isLocal;
+    }
+
+    public byte[] getImage()
+    {
+        return image;
+    }
+
+    /**
+     * Returns a hashCode for this contact. The returned hashcode is actually
+     * that of the Contact's Address
+     * @return the hashcode of this Contact
+     */
+    public int hashCode()
+    {
+        return getAddress().hashCode();
+    }
+
+    /**
+     * Indicates whether some other object is "equal to" this one.
+     * <p>
+     *
+     * @param   obj   the reference object with which to compare.
+     * @return  <tt>true</tt> if this object is the same as the obj
+     *          argument; <tt>false</tt> otherwise.
+     */
+    public boolean equals(Object obj)
+    {
+        if (obj == null
+            || !(obj instanceof ContactYahooImpl)
+            || !(((ContactYahooImpl)obj).getAddress().equals(getAddress())
+                && ((ContactYahooImpl)obj).getProtocolProvider()
+                        == getProtocolProvider()))
+            return false;
+        else
+            return true;
+    }
+
+    /**
+     * Returns a string representation of this contact, containing most of its
+     * representative details.
+     *
+     * @return  a string representation of this contact.
+     */
+    public String toString()
+    {
+        StringBuffer buff =  new StringBuffer("YahooContact[ id=");
+        buff.append(getAddress()).append("]");
+
+        return buff.toString();
+    }
+
+    /**
+     * Sets the status that this contact is currently in. The method is to
+     * only be called as a result of a status update received from the server.
+     *
+     * @param status the YahooStatusEnum that this contact is currently in.
+     */
+    void updatePresenceStatus(PresenceStatus status)
+    {
+        this.status = status;
+    }
+
+    /**
+     * Returns the status of the contact as per the last status update we've
+     * received for it. Note that this method is not to perform any network
+     * operations and will simply return the status received in the last
+     * status update message. If you want a reliable way of retrieving someone's
+     * status, you should use the <tt>queryContactStatus()</tt> method in
+     * <tt>OperationSetPresence</tt>.
+     * @return the PresenceStatus that we've received in the last status update
+     * pertaining to this contact.
+     */
+    public PresenceStatus getPresenceStatus()
+    {
+        return status;
+    }
+
+    /**
+     * Returns a String that could be used by any user interacting modules for
+     * referring to this contact. An alias is not necessarily unique but is
+     * often more human readable than an address (or id).
+     * @return a String that can be used for referring to this contact when
+     * interacting with the user.
+     */
+    public String getDisplayName()
+    {
+        if(isResolved)
+            return getAddress();
+        else
+            return tempId;
+    }
+
+    /**
+     * Returns a reference to the contact group that this contact is currently
+     * a child of or null if the underlying protocol does not suppord persistent
+     * presence.
+     * @return a reference to the contact group that this contact is currently
+     * a child of or null if the underlying protocol does not suppord persistent
+     * presence.
+     */
+    public ContactGroup getParentContactGroup()
+    {
+        return ssclCallback.findContactGroup(this);
+    }
+
+
+    /**
+     * Returns a reference to the protocol provider that created the contact.
+     * @return a refererence to an instance of the ProtocolProviderService
+     */
+    public ProtocolProviderService getProtocolProvider()
+    {
+        return ssclCallback.getParentProvider();
+    }
+
+    /**
+     * Determines whether or not this contact is being stored by the server.
+     * Non persistent contacts are common in the case of simple, non-persistent
+     * presence operation sets. They could however also be seen in persistent
+     * presence operation sets when for example we have received an event
+     * from someone not on our contact list. Non persistent contacts are
+     * volatile even when coming from a persistent presence op. set. They would
+     * only exist until the application is closed and will not be there next
+     * time it is loaded.
+     * @return true if the contact is persistent and false otherwise.
+     */
+    public boolean isPersistent()
+    {
+        return isPersistent;
+    }
+
+    /**
+     * Specifies whether this contact is to be considered persistent or not. The
+     * method is to be used _only_ when a non-persistent contact has been added
+     * to the contact list and its encapsulated VolatileBuddy has been repalced
+     * with a standard buddy.
+     * @param persistent true if the buddy is to be considered persistent and
+     * false for volatile.
+     */
+    void setPersistent(boolean persistent)
+    {
+        this.isPersistent = persistent;
+    }
+
+    /**
+     * Resolve this contact against the given entry
+     * @param entry the server stored entry
+     */
+    void setResolved(YahooUser entry)
+    {
+        if(isResolved)
+            return;
+
+        this.isResolved = true;
+        contact = entry;
+    }
+
+    /**
+     * Returns the persistent data
+     * @return the persistent data
+     */
+    public String getPersistentData()
+    {
+        return null;
+    }
+
+    /**
+     * Determines whether or not this contact has been resolved against the
+     * server. Unresolved contacts are used when initially loading a contact
+     * list that has been stored in a local file until the presence operation
+     * set has managed to retrieve all the contact list from the server and has
+     * properly mapped contacts to their on-line buddies.
+     * @return true if the contact has been resolved (mapped against a buddy)
+     * and false otherwise.
+     */
+    public boolean isResolved()
+    {
+        return isResolved;
+    }
+
+    public void setPersistentData(String persistentData)
+    {
+    }
+
+    /**
+     * Get source contact
+     * @return YahooContact
+     */
+    YahooUser getSourceContact()
+    {
+        return contact;
+    }
+}
\ No newline at end of file
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/MessageYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/MessageYahooImpl.java
new file mode 100644
index 0000000..a84c5c8
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/MessageYahooImpl.java
@@ -0,0 +1,147 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import net.java.sip.communicator.service.protocol.*;
+
+/**
+ * A simple implementation of the <tt>Message</tt> interface. Right now the
+ * message only supports test contents and no binary data.
+ *
+ * @author Damian Minkov
+ */
+public class MessageYahooImpl
+    implements Message
+{
+    /**
+     * The content of this message.
+     */
+    private String textContent = null;
+
+    /**
+     * The content type of text. Right now only text content types (such as
+     * text/plain or text/html) are supported.
+     */
+    private String contentType = null;
+
+    /**
+     * The encoding under which the contennt of this message is encoded.
+     */
+    private String contentEncoding = null;
+
+    /**
+     * An String uniquely identifying this Message.
+     */
+    private String messageUID = null;
+
+    /**
+     * The subject of the message if any (may remain null).
+     */
+    private String subject = null;
+
+    /**
+     * Creates an instance of this Message with the specified parameters.
+     *
+     * @param content the text content of the message.
+     * @param contentType a MIME string indicating the content type of the
+     * <tt>content</tt> String.
+     * @param contentEncoding a MIME String indicating the content encoding of
+     * the <tt>content</tt> String.
+     * @param subject the subject of the message or null for empty.
+     */
+    public MessageYahooImpl(String content,
+                          String contentType,
+                          String contentEncoding,
+                          String subject)
+    {
+        this.textContent = content;
+        this.contentType = contentType;
+        this.contentEncoding = contentEncoding;
+        this.subject = subject;
+
+        //generate the uid
+        this.messageUID = String.valueOf( System.currentTimeMillis())
+                          + String.valueOf(hashCode());
+
+    }
+
+    /**
+     * Returns the content of this message if representable in text form or
+     * null if this message does not contain text data.
+     *
+     * @return a String containing the content of this message or null if
+     *   the message does not contain data representable in text form.
+     */
+    public String getContent()
+    {
+        return textContent;
+    }
+
+    /**
+     * Returns the MIME type for the message content.
+     *
+     * @return a String containing the mime type of the message contant.
+     */
+    public String getContentType()
+    {
+        return contentType;
+    }
+
+    /**
+     * Returns the MIME content encoding of this message.
+     *
+     * @return a String indicating the MIME encoding of this message.
+     */
+    public String getEncoding()
+    {
+        return contentEncoding;
+    }
+
+    /**
+     * Returns a unique identifier of this message.
+     *
+     * @return a String that uniquely represents this message in the scope
+     *   of this protocol.
+     */
+    public String getMessageUID()
+    {
+        return messageUID;
+    }
+
+    /**
+     * Get the raw/binary content of an instant message.
+     *
+     * @return a byte[] array containing message bytes.
+     */
+    public byte[] getRawData()
+    {
+        return getContent().getBytes();
+    }
+
+    /**
+     * Returns the size of the content stored in this message.
+     *
+     * @return an int indicating the number of bytes that this message
+     *   contains.
+     */
+    public int getSize()
+    {
+        return getContent().length();
+    }
+
+    /**
+     * Returns the subject of this message or null if the message contains no
+     * subject.
+     *
+     * @return the subject of this message or null if the message contains
+     *   no subject.
+     */
+    public String getSubject()
+    {
+        return subject;
+    }
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetBasicInstantMessagingYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetBasicInstantMessagingYahooImpl.java
new file mode 100644
index 0000000..170ce2c
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetBasicInstantMessagingYahooImpl.java
@@ -0,0 +1,303 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.io.*;
+import java.util.*;
+
+import net.java.sip.communicator.service.protocol.*;
+import net.java.sip.communicator.service.protocol.event.*;
+import net.java.sip.communicator.service.protocol.yahooconstants.*;
+import net.java.sip.communicator.util.*;
+
+import ymsg.network.*;
+import ymsg.network.event.*;
+
+/**
+ * A straightforward implementation of the basic instant messaging operation
+ * set.
+ *
+ * @author Damian Minkov
+ */
+public class OperationSetBasicInstantMessagingYahooImpl
+    implements OperationSetBasicInstantMessaging
+{
+    private static final Logger logger =
+        Logger.getLogger(OperationSetBasicInstantMessagingYahooImpl.class);
+
+    /**
+     * A list of listeneres registered for message events.
+     */
+    private Vector messageListeners = new Vector();
+
+    /**
+     * The provider that created us.
+     */
+    private ProtocolProviderServiceYahooImpl yahooProvider = null;
+
+    /**
+     * A reference to the persistent presence operation set that we use
+     * to match incoming messages to <tt>Contact</tt>s and vice versa.
+     */
+    private OperationSetPersistentPresenceYahooImpl opSetPersPresence = null;
+
+    /**
+     * Creates an instance of this operation set.
+     * @param provider a ref to the <tt>ProtocolProviderServiceImpl</tt>
+     * that created us and that we'll use for retrieving the underlying aim
+     * connection.
+     */
+    OperationSetBasicInstantMessagingYahooImpl(
+        ProtocolProviderServiceYahooImpl provider)
+    {
+        this.yahooProvider = provider;
+        provider.addRegistrationStateChangeListener(new RegistrationStateListener());
+    }
+
+    /**
+     * Registeres a MessageListener with this operation set so that it gets
+     * notifications of successful message delivery, failure or reception of
+     * incoming messages..
+     *
+     * @param listener the <tt>MessageListener</tt> to register.
+     */
+    public void addMessageListener(MessageListener listener)
+    {
+        synchronized(messageListeners)
+        {
+            if(!messageListeners.contains(listener))
+            {
+                this.messageListeners.add(listener);
+            }
+        }
+    }
+
+    /**
+     * Unregisteres <tt>listener</tt> so that it won't receive any further
+     * notifications upon successful message delivery, failure or reception of
+     * incoming messages..
+     *
+     * @param listener the <tt>MessageListener</tt> to unregister.
+     */
+    public void removeMessageListener(MessageListener listener)
+    {
+        synchronized(messageListeners)
+        {
+            this.messageListeners.remove(listener);
+        }
+    }
+
+    /**
+     * Determines wheter the protocol provider (or the protocol itself) support
+     * sending and receiving offline messages. Most often this method would
+     * return true for protocols that support offline messages and false for
+     * those that don't. It is however possible for a protocol to support these
+     * messages and yet have a particular account that does not (i.e. feature
+     * not enabled on the protocol server). In cases like this it is possible
+     * for this method to return true even when offline messaging is not
+     * supported, and then have the sendMessage method throw an
+     * OperationFailedException with code - OFFLINE_MESSAGES_NOT_SUPPORTED.
+     *
+     * @return <tt>true</tt> if the protocol supports offline messages and
+     * <tt>false</tt> otherwise.
+     */
+    public boolean isOfflineMessagingSupported()
+    {
+        return true;
+    }
+
+    /**
+     * Create a Message instance for sending arbitrary MIME-encoding content.
+     *
+     * @param content content value
+     * @param contentType the MIME-type for <tt>content</tt>
+     * @param contentEncoding encoding used for <tt>content</tt>
+     * @param subject a <tt>String</tt> subject or <tt>null</tt> for now subject.
+     * @return the newly created message.
+     */
+    public Message createMessage(byte[] content, String contentType,
+                                 String contentEncoding, String subject)
+    {
+        return new MessageYahooImpl(new String(content), contentType
+                                  , contentEncoding, subject);
+    }
+
+    /**
+     * Create a Message instance for sending a simple text messages with
+     * default (text/plain) content type and encoding.
+     *
+     * @param messageText the string content of the message.
+     * @return Message the newly created message
+     */
+    public Message createMessage(String messageText)
+    {
+        return new MessageYahooImpl(messageText, DEFAULT_MIME_TYPE
+                                  , DEFAULT_MIME_ENCODING, null);
+    }
+
+    /**
+     * Sends the <tt>message</tt> to the destination indicated by the
+     * <tt>to</tt> contact.
+     *
+     * @param to the <tt>Contact</tt> to send <tt>message</tt> to
+     * @param message the <tt>Message</tt> to send.
+     * @throws java.lang.IllegalStateException if the underlying stack is
+     * not registered and initialized.
+     * @throws java.lang.IllegalArgumentException if <tt>to</tt> is not an
+     * instance of ContactImpl.
+     */
+    public void sendInstantMessage(Contact to, Message message)
+        throws IllegalStateException, IllegalArgumentException
+    {
+        assertConnected();
+
+        try     
+        {
+            yahooProvider.getYahooSession().sendMessage(
+                ((ContactYahooImpl) to).getSourceContact().getId(),
+                message.getContent());
+            
+            MessageDeliveredEvent msgDeliveredEvt
+            = new MessageDeliveredEvent(
+                message, to, new Date());
+
+            fireMessageEvent(msgDeliveredEvt);
+        }
+        catch (IOException ex) 
+        {
+            logger.info("Cannot Send Message! " + ex.getMessage());
+            MessageDeliveryFailedEvent evt =
+                new MessageDeliveryFailedEvent(
+                    message,
+                    to,
+                    MessageDeliveryFailedEvent.NETWORK_FAILURE,
+                    new Date());
+            fireMessageEvent(evt);
+            return;
+        }
+    }
+
+    /**
+     * Utility method throwing an exception if the stack is not properly
+     * initialized.
+     * @throws java.lang.IllegalStateException if the underlying stack is
+     * not registered and initialized.
+     */
+    private void assertConnected() throws IllegalStateException
+    {
+        if (yahooProvider == null)
+            throw new IllegalStateException(
+                "The provider must be non-null and signed on the "
+                +"service before being able to communicate.");
+        if (!yahooProvider.isRegistered())
+            throw new IllegalStateException(
+                "The provider must be signed on the service before "
+                +"being able to communicate.");
+    }
+
+    /**
+     * Our listener that will tell us when we're registered to
+     */
+    private class RegistrationStateListener
+        implements RegistrationStateChangeListener
+    {
+        /**
+         * The method is called by a ProtocolProvider implementation whenver
+         * a change in the registration state of the corresponding provider had
+         * occurred.
+         * @param evt ProviderStatusChangeEvent the event describing the status
+         * change.
+         */
+        public void registrationStateChanged(RegistrationStateChangeEvent evt)
+        {
+            logger.debug("The provider changed state from: "
+                         + evt.getOldState()
+                         + " to: " + evt.getNewState());
+
+            if (evt.getNewState() == RegistrationState.REGISTERED)
+            {
+                opSetPersPresence = (OperationSetPersistentPresenceYahooImpl)
+                    yahooProvider.getSupportedOperationSets()
+                        .get(OperationSetPersistentPresence.class.getName());
+
+                yahooProvider.getYahooSession().
+                    addSessionListener(new YahooMessageListener());
+            }
+        }
+    }
+
+    /**
+     * Delivers the specified event to all registered message listeners.
+     * @param evt the <tt>EventObject</tt> that we'd like delivered to all
+     * registered message listerners.
+     */
+    private void fireMessageEvent(EventObject evt)
+    {
+        Iterator listeners = null;
+        synchronized (messageListeners)
+        {
+            listeners = new ArrayList(messageListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            MessageListener listener
+                = (MessageListener) listeners.next();
+
+            if (evt instanceof MessageDeliveredEvent)
+            {
+                listener.messageDelivered( (MessageDeliveredEvent) evt);
+            }
+            else if (evt instanceof MessageReceivedEvent)
+            {
+                listener.messageReceived( (MessageReceivedEvent) evt);
+            }
+            else if (evt instanceof MessageDeliveryFailedEvent)
+            {
+                listener.messageDeliveryFailed(
+                    (MessageDeliveryFailedEvent) evt);
+            }
+        }
+    }
+
+    private class YahooMessageListener
+        extends SessionAdapter
+    {
+        public void messageReceived(SessionEvent ev)
+        {
+            handleNewMessage(ev);
+        }
+        
+        public void offlineMessageReceived(SessionEvent ev)
+        {
+            handleNewMessage(ev);
+        }
+        
+        private void handleNewMessage(SessionEvent ev)
+        {
+            Message newMessage = createMessage(ev.getMessage());
+            
+            Contact sourceContact = opSetPersPresence.
+                findContactByID(ev.getFrom());
+            
+             if(sourceContact == null)
+            {
+                logger.debug("received a message from an unknown contact: "
+                                   + ev.getFrom());
+                //create the volatile contact
+                sourceContact = opSetPersPresence
+                    .createVolatileContact(ev.getFrom());
+            }
+
+            MessageReceivedEvent msgReceivedEvt
+                = new MessageReceivedEvent(
+                    newMessage, sourceContact , new Date() );
+
+            fireMessageEvent(msgReceivedEvt);    
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetPersistentPresenceYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetPersistentPresenceYahooImpl.java
new file mode 100644
index 0000000..71e6578
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetPersistentPresenceYahooImpl.java
@@ -0,0 +1,1066 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.beans.*;
+import java.io.*;
+import java.util.*;
+import net.java.sip.communicator.service.protocol.*;
+import net.java.sip.communicator.service.protocol.event.*;
+import net.java.sip.communicator.service.protocol.yahooconstants.*;
+import net.java.sip.communicator.util.*;
+import ymsg.network.*;
+import ymsg.network.event.*;
+
+/**
+ * The Yahoo implementation of a Persistent Presence Operation set. This class
+ * manages our own presence status as well as subscriptions for the presence
+ * status of our buddies. It also offers methods for retrieving and modifying
+ * the buddy contact list and adding listeners for changes in its layout.
+ *
+ * @author Damian Minkov
+ */
+public class OperationSetPersistentPresenceYahooImpl
+    implements OperationSetPersistentPresence
+{
+    private static final Logger logger =
+        Logger.getLogger(OperationSetPersistentPresenceYahooImpl.class);
+
+    /**
+     * A callback to the Yahoo provider that created us.
+     */
+    private ProtocolProviderServiceYahooImpl yahooProvider = null;
+
+    /**
+     * Contains our current status message. Note that this field would only
+     * be changed once the server has confirmed the new status message and
+     * not immediately upon setting a new one..
+     */
+    private String currentStatusMessage = "";
+
+    /**
+     * The presence status that we were last notified of etnering.
+     * The initial one is OFFLINE
+     */
+    private PresenceStatus currentStatus = YahooStatusEnum.OFFLINE;
+
+    /**
+     * The list of listeners interested in receiving changes in our local
+     * presencestatus.
+     */
+    private Vector providerPresenceStatusListeners = new Vector();
+
+    /**
+     * The list of subscription listeners interested in receiving  notifications
+     * whenever .
+     */
+    private Vector subscriptionListeners = new Vector();
+
+    /**
+     * The list of presence status listeners interested in receiving presence
+     * notifications of changes in status of contacts in our contact list.
+     */
+    private Vector contactPresenceStatusListeners = new Vector();
+
+    /**
+     * Sometimes status changes are received before the contact list is inited
+     * here we store such events so we can show them correctly
+     */
+    private Hashtable earlyStatusChange = new Hashtable();
+
+    /**
+     * The array list we use when returning from the getSupportedStatusSet()
+     * method.
+     */
+    private static final ArrayList supportedPresenceStatusSet = new ArrayList();
+    static{
+        supportedPresenceStatusSet.add(YahooStatusEnum.AVAILABLE);
+        supportedPresenceStatusSet.add(YahooStatusEnum.BE_RIGHT_BACK);
+        supportedPresenceStatusSet.add(YahooStatusEnum.BUSY);
+        supportedPresenceStatusSet.add(YahooStatusEnum.IDLE);
+        supportedPresenceStatusSet.add(YahooStatusEnum.INVISIBLE);
+        supportedPresenceStatusSet.add(YahooStatusEnum.NOT_AT_DESK);
+        supportedPresenceStatusSet.add(YahooStatusEnum.NOT_AT_HOME);
+        supportedPresenceStatusSet.add(YahooStatusEnum.NOT_IN_OFFICE);
+        supportedPresenceStatusSet.add(YahooStatusEnum.OFFLINE);
+        supportedPresenceStatusSet.add(YahooStatusEnum.ON_THE_PHONE);
+        supportedPresenceStatusSet.add(YahooStatusEnum.ON_VACATION);
+        supportedPresenceStatusSet.add(YahooStatusEnum.OUT_TO_LUNCH);
+        supportedPresenceStatusSet.add(YahooStatusEnum.STEPPED_OUT);
+    }
+
+    /**
+     * A map containing bindings between SIP Communicator's yahoo presence status
+     * instances and Yahoo status codes
+     */
+    private static Map scToYahooModesMappings = new Hashtable();
+    static{
+        scToYahooModesMappings.put(YahooStatusEnum.AVAILABLE,
+                                new Long(StatusConstants.STATUS_AVAILABLE));
+        scToYahooModesMappings.put(YahooStatusEnum.BE_RIGHT_BACK,
+                                new Long(StatusConstants.STATUS_BRB));
+        scToYahooModesMappings.put(YahooStatusEnum.BUSY,
+                                 new Long(StatusConstants.STATUS_BUSY));
+        scToYahooModesMappings.put(YahooStatusEnum.IDLE,
+                                 new Long(StatusConstants.STATUS_IDLE));
+        scToYahooModesMappings.put(YahooStatusEnum.INVISIBLE,
+                                 new Long(StatusConstants.STATUS_INVISIBLE));
+        scToYahooModesMappings.put(YahooStatusEnum.NOT_AT_DESK,
+                                 new Long(StatusConstants.STATUS_NOTATDESK));
+        scToYahooModesMappings.put(YahooStatusEnum.NOT_AT_HOME,
+                                 new Long(StatusConstants.STATUS_NOTATHOME));
+        scToYahooModesMappings.put(YahooStatusEnum.NOT_IN_OFFICE,
+                                 new Long(StatusConstants.STATUS_NOTINOFFICE));
+        scToYahooModesMappings.put(YahooStatusEnum.OFFLINE,
+                                 new Long(StatusConstants.STATUS_OFFLINE));
+        scToYahooModesMappings.put(YahooStatusEnum.ON_THE_PHONE,
+                                 new Long(StatusConstants.STATUS_ONPHONE));
+        scToYahooModesMappings.put(YahooStatusEnum.ON_VACATION,
+                                 new Long(StatusConstants.STATUS_ONVACATION));
+        scToYahooModesMappings.put(YahooStatusEnum.OUT_TO_LUNCH,
+                                 new Long(StatusConstants.STATUS_OUTTOLUNCH));
+        scToYahooModesMappings.put(YahooStatusEnum.STEPPED_OUT,
+                                 new Long(StatusConstants.STATUS_STEPPEDOUT));
+    }
+
+    /**
+     * The server stored contact list that will be encapsulating smack's
+     * buddy list.
+     */
+    private ServerStoredContactListYahooImpl ssContactList = null;
+
+    public OperationSetPersistentPresenceYahooImpl(
+        ProtocolProviderServiceYahooImpl provider)
+    {
+        this.yahooProvider = provider;
+
+        ssContactList = new ServerStoredContactListYahooImpl( this , provider);
+
+        this.yahooProvider.addRegistrationStateChangeListener(
+            new RegistrationStateListener());
+    }
+
+    /**
+     * Registers a listener that would receive a presence status change event
+     * every time a contact, whose status we're subscribed for, changes her
+     * status.
+     *
+     * @param listener the listener that would received presence status
+     *   updates for contacts.
+     */
+    public void addContactPresenceStatusListener(ContactPresenceStatusListener
+                                                 listener)
+    {
+        synchronized(contactPresenceStatusListeners){
+                    this.contactPresenceStatusListeners.add(listener);
+        }
+    }
+
+    /**
+     * Adds a listener that would receive events upon changes of the provider
+     * presence status.
+     *
+     * @param listener the listener to register for changes in our
+     *   PresenceStatus.
+     */
+    public void addProviderPresenceStatusListener(
+        ProviderPresenceStatusListener listener)
+    {
+        synchronized(providerPresenceStatusListeners){
+            providerPresenceStatusListeners.add(listener);
+        }
+    }
+
+    /**
+     * Registers a listener that would receive events upong changes in server
+     * stored groups.
+     *
+     * @param listener a ServerStoredGroupChangeListener impl that would
+     *   receive events upong group changes.
+     */
+    public void addServerStoredGroupChangeListener(ServerStoredGroupListener
+        listener)
+    {
+        ssContactList.addGroupListener(listener);
+    }
+
+    /**
+     * Registers a listener that would get notifications any time a new
+     * subscription was succesfully added, has failed or was removed.
+     *
+     * @param listener the SubscriptionListener to register
+     */
+    public void addSubsciptionListener(SubscriptionListener listener)
+    {
+        synchronized(subscriptionListeners){
+           subscriptionListeners.add(listener);
+       }
+    }
+
+    /**
+     * Creates a group with the specified name and parent in the server
+     * stored contact list.
+     *
+     * @param parent the group where the new group should be created
+     * @param groupName the name of the new group to create.
+     * @throws OperationFailedException if such group already exists
+     */
+    public void createServerStoredContactGroup(ContactGroup parent,
+                                               String groupName)
+        throws OperationFailedException
+    {
+        assertConnected();
+
+        if (!parent.canContainSubgroups())
+           throw new IllegalArgumentException(
+               "The specified contact group cannot contain child groups. Group:"
+               + parent );
+
+        ssContactList.createGroup(groupName);
+    }
+
+    /**
+     * Creates a non persistent contact for the specified address. This would
+     * also create (if necessary) a group for volatile contacts that would not
+     * be added to the server stored contact list. The volatile contact would
+     * remain in the list until it is really added to the contact list or
+     * until the application is terminated.
+     * @param id the address of the contact to create.
+     * @return the newly created volatile <tt>ContactImpl</tt>
+     */
+    public ContactYahooImpl createVolatileContact(String id)
+    {
+        return ssContactList.createVolatileContact(id);
+    }
+
+    /**
+     * Creates and returns a unresolved contact from the specified
+     * <tt>address</tt> and <tt>persistentData</tt>.
+     *
+     * @param address an identifier of the contact that we'll be creating.
+     * @param persistentData a String returned Contact's getPersistentData()
+     *   method during a previous run and that has been persistently stored
+     *   locally.
+     * @param parentGroup the group where the unresolved contact is supposed
+     *   to belong to.
+     * @return the unresolved <tt>Contact</tt> created from the specified
+     *   <tt>address</tt> and <tt>persistentData</tt>
+     */
+    public Contact createUnresolvedContact(String address,
+                                           String persistentData,
+                                           ContactGroup parentGroup)
+    {
+        if(! (parentGroup instanceof ContactGroupYahooImpl ||
+              parentGroup instanceof RootContactGroupYahooImpl) )
+            throw new IllegalArgumentException(
+                "Argument is not an yahoo contact group (group="
+                + parentGroup + ")");
+
+        ContactYahooImpl contact =
+            ssContactList.createUnresolvedContact(parentGroup, address);
+
+        contact.setPersistentData(persistentData);
+
+        return contact;
+    }
+
+    /**
+     * Creates and returns a unresolved contact from the specified
+     * <tt>address</tt> and <tt>persistentData</tt>.
+     *
+     * @param address an identifier of the contact that we'll be creating.
+     * @param persistentData a String returned Contact's getPersistentData()
+     *   method during a previous run and that has been persistently stored
+     *   locally.
+     * @return the unresolved <tt>Contact</tt> created from the specified
+     *   <tt>address</tt> and <tt>persistentData</tt>
+     */
+    public Contact createUnresolvedContact(String address,
+                                           String persistentData)
+    {
+        return createUnresolvedContact(  address
+                                       , persistentData
+                                       , getServerStoredContactListRoot());
+    }
+
+    /**
+     * Creates and returns a unresolved contact group from the specified
+     * <tt>address</tt> and <tt>persistentData</tt>.
+     *
+     * @param groupUID an identifier, returned by ContactGroup's
+     *   getGroupUID, that the protocol provider may use in order to create
+     *   the group.
+     * @param persistentData a String returned ContactGroups's
+     *   getPersistentData() method during a previous run and that has been
+     *   persistently stored locally.
+     * @param parentGroup the group under which the new group is to be
+     *   created or null if this is group directly underneath the root.
+     * @return the unresolved <tt>ContactGroup</tt> created from the
+     *   specified <tt>uid</tt> and <tt>persistentData</tt>
+     */
+    public ContactGroup createUnresolvedContactGroup(String groupUID,
+        String persistentData, ContactGroup parentGroup)
+    {
+        return ssContactList.createUnresolvedContactGroup(groupUID);
+    }
+
+    /**
+     * Returns a reference to the contact with the specified ID in case we
+     * have a subscription for it and null otherwise/
+     *
+     * @param contactID a String identifier of the contact which we're
+     *   seeking a reference of.
+     * @return a reference to the Contact with the specified
+     *   <tt>contactID</tt> or null if we don't have a subscription for the
+     *   that identifier.
+     */
+    public Contact findContactByID(String contactID)
+    {
+        return ssContactList.findContactById(contactID);
+    }
+
+    /**
+     * Returns the status message that was confirmed by the serfver
+     *
+     * @return the last status message that we have requested and the aim
+     *   server has confirmed.
+     */
+    public String getCurrentStatusMessage()
+    {
+        return currentStatusMessage;
+    }
+
+    /**
+     * Returns the protocol specific contact instance representing the local
+     * user.
+     *
+     * @return the Contact (address, phone number, or uin) that the Provider
+     *   implementation is communicating on behalf of.
+     */
+    public Contact getLocalContact()
+    {
+        return null;
+    }
+
+    /**
+     * Returns a PresenceStatus instance representing the state this provider
+     * is currently in.
+     *
+     * @return the PresenceStatus last published by this provider.
+     */
+    public PresenceStatus getPresenceStatus()
+    {
+        return currentStatus;
+    }
+
+    /**
+     * Returns the root group of the server stored contact list.
+     *
+     * @return the root ContactGroup for the ContactList stored by this
+     *   service.
+     */
+    public ContactGroup getServerStoredContactListRoot()
+    {
+        return ssContactList.getRootGroup();
+    }
+
+    /**
+     * Returns the set of PresenceStatus objects that a user of this service
+     * may request the provider to enter.
+     *
+     * @return Iterator a PresenceStatus array containing "enterable" status
+     *   instances.
+     */
+    public Iterator getSupportedStatusSet()
+    {
+        return supportedPresenceStatusSet.iterator();
+    }
+
+    /**
+     * Removes the specified contact from its current parent and places it
+     * under <tt>newParent</tt>.
+     *
+     * @param contactToMove the <tt>Contact</tt> to move
+     * @param newParent the <tt>ContactGroup</tt> where <tt>Contact</tt>
+     *   would be placed.
+     */
+    public void moveContactToGroup(Contact contactToMove,
+                                   ContactGroup newParent)
+    {
+        assertConnected();
+
+        if( !(contactToMove instanceof ContactYahooImpl) )
+            throw new IllegalArgumentException(
+                "The specified contact is not an yahoo contact." + contactToMove);
+        if( !(newParent instanceof ContactGroupYahooImpl) )
+            throw new IllegalArgumentException(
+                "The specified group is not an yahoo contact group."
+                + newParent);
+
+        ssContactList.moveContact((ContactYahooImpl)contactToMove,
+                                  (ContactGroupYahooImpl)newParent);
+    }
+
+    /**
+     * Requests the provider to enter into a status corresponding to the
+     * specified paramters.
+     *
+     * @param status the PresenceStatus as returned by
+     *   getRequestableStatusSet
+     * @param statusMessage the message that should be set as the reason to
+     *   enter that status
+     * @throws IllegalArgumentException if the status requested is not a
+     *   valid PresenceStatus supported by this provider.
+     * @throws IllegalStateException if the provider is not currently
+     *   registered.
+     * @throws OperationFailedException with code NETWORK_FAILURE if
+     *   publishing the status fails due to a network error.
+     */
+    public void publishPresenceStatus(PresenceStatus status,
+                                      String statusMessage) throws
+        IllegalArgumentException, IllegalStateException,
+        OperationFailedException
+    {
+        assertConnected();
+
+        if (!(status instanceof YahooStatusEnum))
+            throw new IllegalArgumentException(
+                            status + " is not a valid Yahoo status");
+
+        if(status.equals(YahooStatusEnum.OFFLINE))
+        {
+            yahooProvider.unregister();
+            return;
+        }
+        
+        try
+        {
+            yahooProvider.getYahooSession().setStatus(
+                ((Long)scToYahooModesMappings.get(status)).longValue());
+
+            fireProviderPresenceStatusChangeEvent(currentStatus, status);
+        }
+        catch(IOException ex)
+        {
+            throw new OperationFailedException("Failed to set Status",
+                OperationFailedException.NETWORK_FAILURE);
+        }
+    }
+
+    /**
+     * Get the PresenceStatus for a particular contact.
+     *
+     * @param contactIdentifier the identifier of the contact whose status
+     *   we're interested in.
+     * @return PresenceStatus the <tt>PresenceStatus</tt> of the specified
+     *   <tt>contact</tt>
+     * @throws IllegalArgumentException if <tt>contact</tt> is not a contact
+     *   known to the underlying protocol provider
+     * @throws IllegalStateException if the underlying protocol provider is
+     *   not registered/signed on a public service.
+     * @throws OperationFailedException with code NETWORK_FAILURE if
+     *   retrieving the status fails due to errors experienced during
+     *   network communication
+     */
+    public PresenceStatus queryContactStatus(String contactIdentifier) throws
+        IllegalArgumentException, IllegalStateException,
+        OperationFailedException
+    {
+        
+        ContactYahooImpl contact = ssContactList.findContactById(contactIdentifier);
+        if(contact == null)
+        {
+            logger.info("Contact not found id :" + contactIdentifier);
+            return null;
+        }
+        else
+            return yahooStatusToPresenceStatus(contact.getSourceContact().getStatus());
+    }
+
+    /**
+     * Removes the specified listener so that it won't receive any further
+     * updates on contact presence status changes
+     *
+     * @param listener the listener to remove.
+     */
+    public void removeContactPresenceStatusListener(
+        ContactPresenceStatusListener listener)
+    {
+        synchronized(contactPresenceStatusListeners){
+            contactPresenceStatusListeners.remove(listener);
+        }
+    }
+
+    /**
+     * Unregisters the specified listener so that it does not receive further
+     * events upon changes in local presence status.
+     *
+     * @param listener ProviderPresenceStatusListener
+     */
+    public void removeProviderPresenceStatusListener(
+        ProviderPresenceStatusListener listener)
+    {
+        synchronized(providerPresenceStatusListeners){
+            providerPresenceStatusListeners.remove(listener);
+        }
+    }
+
+    /**
+     * Removes the specified group from the server stored contact list.
+     *
+     * @param group the group to remove.
+     */
+    public void removeServerStoredContactGroup(ContactGroup group)
+    {
+        assertConnected();
+
+        if( !(group instanceof ContactGroupYahooImpl) )
+            throw new IllegalArgumentException(
+                "The specified group is not an yahoo contact group: " + group);
+
+        ssContactList.removeGroup(((ContactGroupYahooImpl)group));
+    }
+
+    /**
+     * Removes the specified group change listener so that it won't receive
+     * any further events.
+     *
+     * @param listener the ServerStoredGroupChangeListener to remove
+     */
+    public void removeServerStoredGroupChangeListener(ServerStoredGroupListener
+        listener)
+    {
+        ssContactList.removeGroupListener(listener);
+    }
+
+    /**
+     * Removes the specified subscription listener.
+     *
+     * @param listener the listener to remove.
+     */
+    public void removeSubscriptionListener(SubscriptionListener listener)
+    {
+        synchronized(subscriptionListeners){
+            subscriptionListeners.remove(listener);
+        }
+    }
+
+    /**
+     * Renames the specified group from the server stored contact list.
+     *
+     * @param group the group to rename.
+     * @param newName the new name of the group.
+     */
+    public void renameServerStoredContactGroup(ContactGroup group,
+                                               String newName)
+    {
+        assertConnected();
+
+        if( !(group instanceof ContactGroupYahooImpl) )
+            throw new IllegalArgumentException(
+                "The specified group is not an yahoo contact group: " + group);
+        
+        throw new UnsupportedOperationException("Renaming group not supported!");
+        //ssContactList.renameGroup((ContactGroupYahooImpl)group, newName);
+    }
+
+    /**
+     * Handler for incoming authorization requests.
+     *
+     * @param handler an instance of an AuthorizationHandler for
+     *   authorization requests coming from other users requesting
+     *   permission add us to their contact list.
+     */
+    public void setAuthorizationHandler(AuthorizationHandler handler)
+    {
+        ssContactList.setAuthorizationHandler(handler);
+    }
+
+    /**
+     * Persistently adds a subscription for the presence status of the
+     * contact corresponding to the specified contactIdentifier and indicates
+     * that it should be added to the specified group of the server stored
+     * contact list.
+     *
+     * @param parent the parent group of the server stored contact list
+     *   where the contact should be added. <p>
+     * @param contactIdentifier the contact whose status updates we are
+     *   subscribing for.
+     * @throws IllegalArgumentException if <tt>contact</tt> or
+     *   <tt>parent</tt> are not a contact known to the underlying protocol
+     *   provider.
+     * @throws IllegalStateException if the underlying protocol provider is
+     *   not registered/signed on a public service.
+     * @throws OperationFailedException with code NETWORK_FAILURE if
+     *   subscribing fails due to errors experienced during network
+     *   communication
+     */
+    public void subscribe(ContactGroup parent, String contactIdentifier) throws
+        IllegalArgumentException, IllegalStateException,
+        OperationFailedException
+    {
+        assertConnected();
+
+        if(! (parent instanceof ContactGroupYahooImpl) )
+            throw new IllegalArgumentException(
+                "Argument is not an yahoo contact group (group=" + parent + ")");
+
+        ssContactList.addContact((ContactGroupYahooImpl)parent, contactIdentifier);
+    }
+
+    /**
+     * Adds a subscription for the presence status of the contact
+     * corresponding to the specified contactIdentifier.
+     *
+     * @param contactIdentifier the identifier of the contact whose status
+     *   updates we are subscribing for. <p>
+     * @throws IllegalArgumentException if <tt>contact</tt> is not a contact
+     *   known to the underlying protocol provider
+     * @throws IllegalStateException if the underlying protocol provider is
+     *   not registered/signed on a public service.
+     * @throws OperationFailedException with code NETWORK_FAILURE if
+     *   subscribing fails due to errors experienced during network
+     *   communication
+     */
+    public void subscribe(String contactIdentifier) throws
+        IllegalArgumentException, IllegalStateException,
+        OperationFailedException
+    {
+        assertConnected();
+
+        ssContactList.addContact(contactIdentifier);
+    }
+
+    /**
+     * Removes a subscription for the presence status of the specified
+     * contact.
+     *
+     * @param contact the contact whose status updates we are unsubscribing
+     *   from.
+     * @throws IllegalArgumentException if <tt>contact</tt> is not a contact
+     *   known to the underlying protocol provider
+     * @throws IllegalStateException if the underlying protocol provider is
+     *   not registered/signed on a public service.
+     * @throws OperationFailedException with code NETWORK_FAILURE if
+     *   unsubscribing fails due to errors experienced during network
+     *   communication
+     */
+    public void unsubscribe(Contact contact) throws IllegalArgumentException,
+        IllegalStateException, OperationFailedException
+    {
+        assertConnected();
+
+        if(! (contact instanceof ContactYahooImpl) )
+            throw new IllegalArgumentException(
+                "Argument is not an yahoo contact (contact=" + contact + ")");
+
+        ssContactList.removeContact((ContactYahooImpl)contact);
+    }
+
+    /**
+     * Converts the specified yahoo status to one of the status fields of the
+     * YahooStatusEnum class.
+     *
+     * @param status the yahoo Status
+     * @return a PresenceStatus instance representation of the yahoo Status
+     * parameter. The returned result is one of the YahooStatusEnum fields.
+     */
+    YahooStatusEnum yahooStatusToPresenceStatus(long status)
+    {
+        if(status == StatusConstants.STATUS_AVAILABLE)
+            return YahooStatusEnum.AVAILABLE;
+        else if(status == StatusConstants.STATUS_BRB)
+            return YahooStatusEnum.BE_RIGHT_BACK;
+        else if(status == StatusConstants.STATUS_BUSY)
+            return YahooStatusEnum.BUSY;
+        else if(status == StatusConstants.STATUS_NOTATHOME)
+            return YahooStatusEnum.NOT_AT_HOME;
+        else if(status == StatusConstants.STATUS_NOTATDESK)
+            return YahooStatusEnum.NOT_AT_DESK;
+        else if(status == StatusConstants.STATUS_NOTINOFFICE)
+            return YahooStatusEnum.NOT_IN_OFFICE;
+        else if(status == StatusConstants.STATUS_ONPHONE)
+            return YahooStatusEnum.ON_THE_PHONE;
+        else if(status == StatusConstants.STATUS_ONVACATION)
+            return YahooStatusEnum.ON_VACATION;
+        else if(status == StatusConstants.STATUS_OUTTOLUNCH)
+            return YahooStatusEnum.OUT_TO_LUNCH;
+        else if(status == StatusConstants.STATUS_STEPPEDOUT)
+            return YahooStatusEnum.STEPPED_OUT;
+        else if(status == StatusConstants.STATUS_INVISIBLE)
+            return YahooStatusEnum.INVISIBLE;
+        else if(status == StatusConstants.STATUS_IDLE)
+            return YahooStatusEnum.IDLE;
+        else if(status == StatusConstants.STATUS_OFFLINE)
+            return YahooStatusEnum.OFFLINE;
+        // Yahoo supports custom statuses so if such is set just return available
+        else
+            return YahooStatusEnum.OFFLINE;
+    }
+
+    /**
+     * Utility method throwing an exception if the stack is not properly
+     * initialized.
+     * @throws java.lang.IllegalStateException if the underlying stack is
+     * not registered and initialized.
+     */
+    private void assertConnected() throws IllegalStateException
+    {
+        if (yahooProvider == null)
+            throw new IllegalStateException(
+                "The provider must be non-null and signed on the yahoo "
+                +"service before being able to communicate.");
+        if (!yahooProvider.isRegistered())
+            throw new IllegalStateException(
+                "The provider must be signed on the yahoo service before "
+                +"being able to communicate.");
+    }
+
+    /**
+     * Notify all provider presence listeners of the corresponding event change
+     * @param oldStatus the status our stack had so far
+     * @param newStatus the status we have from now on
+     */
+    void fireProviderPresenceStatusChangeEvent(
+        PresenceStatus oldStatus, PresenceStatus newStatus)
+    {
+        if(oldStatus.equals(newStatus)){
+            logger.debug("Ignored prov stat. change evt. old==new = "
+                         + oldStatus);
+            return;
+        }
+
+        ProviderPresenceStatusChangeEvent evt =
+            new ProviderPresenceStatusChangeEvent(
+                yahooProvider, oldStatus, newStatus);
+
+        currentStatus = newStatus;
+
+
+        logger.debug("Dispatching Provider Status Change. Listeners="
+                     + providerPresenceStatusListeners.size()
+                     + " evt=" + evt);
+
+        Iterator listeners = null;
+        synchronized (providerPresenceStatusListeners)
+        {
+            listeners = new ArrayList(providerPresenceStatusListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            ProviderPresenceStatusListener listener
+                = (ProviderPresenceStatusListener) listeners.next();
+
+            listener.providerStatusChanged(evt);
+        }
+    }
+
+    /**
+     * Notify all provider presence listeners that a new status message has
+     * been set.
+     * @param oldStatusMessage the status message our stack had so far
+     * @param newStatusMessage the status message we have from now on
+     */
+    private void fireProviderStatusMessageChangeEvent(
+                        String oldStatusMessage, String newStatusMessage)
+    {
+
+        PropertyChangeEvent evt = new PropertyChangeEvent(
+                yahooProvider, ProviderPresenceStatusListener.STATUS_MESSAGE,
+                oldStatusMessage, newStatusMessage);
+
+        logger.debug("Dispatching  stat. msg change. Listeners="
+                     + providerPresenceStatusListeners.size()
+                     + " evt=" + evt);
+
+        Iterator listeners = null;
+        synchronized (providerPresenceStatusListeners)
+        {
+            listeners = new ArrayList(providerPresenceStatusListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            ProviderPresenceStatusListener listener =
+                (ProviderPresenceStatusListener) listeners.next();
+
+            listener.providerStatusMessageChanged(evt);
+        }
+    }
+
+    /**
+     * Statuses have been received durring login process
+     * so we will init them once we are logged in
+     */
+    private void initContactStatuses()
+    {
+        YahooGroup[] groups = yahooProvider.getYahooSession().getGroups();
+        
+        for (int i = 0; i < groups.length; i++)
+        {
+            YahooGroup item = groups[i];
+            Iterator iter = item.getMembers().iterator();
+            while(iter.hasNext())
+            {
+                YahooUser user =  (YahooUser)iter.next();
+                
+                ContactYahooImpl sourceContact = 
+                    ssContactList.findContactById(user.getId());                
+                
+                if(sourceContact != null)
+                    handleContactStatusChange(sourceContact, user.getStatus());
+            }
+        }
+    }
+
+    /**
+     * Our listener that will tell us when we're registered to server
+     * and is ready to accept us as a listener.
+     */
+    private class RegistrationStateListener
+        implements RegistrationStateChangeListener
+    {
+        /**
+         * The method is called by a ProtocolProvider implementation whenver
+         * a change in the registration state of the corresponding provider had
+         * occurred.
+         * @param evt ProviderStatusChangeEvent the event describing the status
+         * change.
+         */
+        public void registrationStateChanged(RegistrationStateChangeEvent evt)
+        {
+            logger.debug("The yahoo provider changed state from: "
+                         + evt.getOldState()
+                         + " to: " + evt.getNewState());
+
+            if(evt.getNewState() == RegistrationState.REGISTERED)
+            {
+                yahooProvider.getYahooSession().
+                    addSessionListener(new StatusChangedListener());
+                
+                ssContactList.setYahooSession(yahooProvider.getYahooSession());
+                
+                initContactStatuses();
+            }
+            else if(evt.getNewState() == RegistrationState.UNREGISTERED
+                 || evt.getNewState() == RegistrationState.AUTHENTICATION_FAILED
+                 || evt.getNewState() == RegistrationState.CONNECTION_FAILED)
+            {
+                //since we are disconnected, we won't receive any further status
+                //updates so we need to change by ourselves our own status as
+                //well as set to offline all contacts in our contact list that
+                //were online
+                PresenceStatus oldStatus = currentStatus;
+                currentStatus = YahooStatusEnum.OFFLINE;
+
+                fireProviderPresenceStatusChangeEvent(oldStatus,
+                    currentStatus);
+
+                //send event notifications saying that all our buddies are
+                //offline. The protocol does not implement top level buddies
+                //nor subgroups for top level groups so a simple nested loop
+                //would be enough.
+                Iterator groupsIter =
+                    getServerStoredContactListRoot().subgroups();
+                while(groupsIter.hasNext())
+                {
+                    ContactGroupYahooImpl group
+                        = (ContactGroupYahooImpl)groupsIter.next();
+
+                    Iterator contactsIter = group.contacts();
+
+                    while(contactsIter.hasNext())
+                    {
+                        ContactYahooImpl contact
+                            = (ContactYahooImpl)contactsIter.next();
+
+                        PresenceStatus oldContactStatus
+                            = contact.getPresenceStatus();
+
+                        if(!oldContactStatus.isOnline())
+                            continue;
+
+                        contact.updatePresenceStatus(YahooStatusEnum.OFFLINE);
+
+                        fireContactPresenceStatusChangeEvent(
+                              contact
+                            , contact.getParentContactGroup()
+                            , oldContactStatus, YahooStatusEnum.OFFLINE);
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Notify all subscription listeners of the corresponding event.
+     *
+     * @param eventID the int ID of the event to dispatch
+     * @param sourceContact the ContactYahooImpl instance that this event is
+     * pertaining to.
+     * @param parentGroup the ContactGroupYahooImpl under which the corresponding
+     * subscription is located.
+     */
+    void fireSubscriptionEvent( int eventID,
+                                ContactYahooImpl sourceContact,
+                                ContactGroup parentGroup)
+    {
+        SubscriptionEvent evt =
+            new SubscriptionEvent(sourceContact, yahooProvider, parentGroup,
+                                  eventID);
+
+        logger.debug("Dispatching a Subscription Event to"
+                     +subscriptionListeners.size() + " listeners. Evt="+evt);
+
+        Iterator listeners = null;
+        synchronized (subscriptionListeners)
+        {
+            listeners = new ArrayList(subscriptionListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            SubscriptionListener listener
+                = (SubscriptionListener) listeners.next();
+
+            if (evt.getEventID() == SubscriptionEvent.SUBSCRIPTION_CREATED)
+                listener.subscriptionCreated(evt);
+            else if (evt.getEventID() == SubscriptionEvent.SUBSCRIPTION_REMOVED)
+                listener.subscriptionRemoved(evt);
+            else if (evt.getEventID() == SubscriptionEvent.SUBSCRIPTION_FAILED)
+                listener.subscriptionFailed(evt);
+        }
+    }
+
+    /**
+     * Notify all subscription listeners of the corresponding event.
+     *
+     * @param sourceContact the ContactYahooImpl instance that this event is
+     * pertaining to.
+     * @param oldParentGroup the group that was previously a parent of the
+     * source contact.
+     * @param newParentGroup the group under which the corresponding
+     * subscription is currently located.
+     */
+    void fireSubscriptionMovedEvent( ContactYahooImpl sourceContact,
+                                     ContactGroup oldParentGroup,
+                                     ContactGroup newParentGroup)
+    {
+        SubscriptionMovedEvent evt =
+            new SubscriptionMovedEvent(sourceContact, yahooProvider
+                                       , oldParentGroup, newParentGroup);
+
+        logger.debug("Dispatching a Subscription Event to"
+                     +subscriptionListeners.size() + " listeners. Evt="+evt);
+
+        Iterator listeners = null;
+        synchronized (subscriptionListeners)
+        {
+            listeners = new ArrayList(subscriptionListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            SubscriptionListener listener
+                = (SubscriptionListener) listeners.next();
+
+            listener.subscriptionMoved(evt);
+        }
+    }
+
+    /**
+     * Notify all contact presence listeners of the corresponding event change
+     * @param contact the contact that changed its status
+     * @param oldStatus the status that the specified contact had so far
+     * @param newStatus the status that the specified contact is currently in.
+     * @param parentGroup the group containing the contact which caused the event
+     */
+    private void fireContactPresenceStatusChangeEvent(
+                        Contact contact,
+                        ContactGroup parentGroup,
+                        PresenceStatus oldStatus,
+                        PresenceStatus newStatus)
+    {
+        ContactPresenceStatusChangeEvent evt =
+            new ContactPresenceStatusChangeEvent(
+                contact, yahooProvider, parentGroup, oldStatus, newStatus);
+
+
+        logger.debug("Dispatching Contact Status Change. Listeners="
+                     + contactPresenceStatusListeners.size()
+                     + " evt=" + evt);
+
+        Iterator listeners = null;
+        synchronized (contactPresenceStatusListeners)
+        {
+            listeners = new ArrayList(contactPresenceStatusListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            ContactPresenceStatusListener listener
+                = (ContactPresenceStatusListener) listeners.next();
+
+            listener.contactPresenceStatusChanged(evt);
+        }
+    }
+    
+    void handleContactStatusChange(ContactYahooImpl sourceContact, long newStat)
+    {
+        PresenceStatus oldStatus
+                = sourceContact.getPresenceStatus();
+
+        PresenceStatus newStatus = yahooStatusToPresenceStatus(newStat);
+
+        // when old and new status are the same do nothing - no change
+        if(oldStatus.equals(newStatus))
+            return;
+
+        sourceContact.updatePresenceStatus(newStatus);
+
+        ContactGroup parent
+            = ssContactList.findContactGroup(sourceContact);
+
+        logger.debug("Will Dispatch the contact status event.");
+        fireContactPresenceStatusChangeEvent(sourceContact, parent,
+            oldStatus, newStatus);
+    }
+    
+    private class StatusChangedListener
+        extends SessionAdapter
+    {
+        public void friendsUpdateReceived(SessionFriendEvent evt) 
+        {
+            logger.debug("Received a status update for contact " + evt);
+            
+            ContactYahooImpl sourceContact = 
+                ssContactList.findContactById(evt.getFriend().getId());
+
+            if(sourceContact == null)
+            {
+                if(yahooProvider.getAccountID().getUserID().
+                    equals(evt.getFriend().getId()))
+                {
+                    // thats my own status
+                    logger.trace("Own status changed to " + evt.getFriend().getStatus());
+                    PresenceStatus oldStatus = currentStatus;
+                    currentStatus =
+                        yahooStatusToPresenceStatus(evt.getFriend().getStatus());
+                    fireProviderPresenceStatusChangeEvent(oldStatus, currentStatus);
+
+                    return;
+                }
+                // strange
+                else                    
+                    return;
+            }
+            
+            handleContactStatusChange(sourceContact, evt.getFriend().getStatus());
+        }
+    }    
+}
\ No newline at end of file
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetTypingNotificationsYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetTypingNotificationsYahooImpl.java
new file mode 100644
index 0000000..6e7f4c4
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/OperationSetTypingNotificationsYahooImpl.java
@@ -0,0 +1,219 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.util.*;
+import net.java.sip.communicator.service.protocol.*;
+import net.java.sip.communicator.service.protocol.event.*;
+import net.java.sip.communicator.util.*;
+import ymsg.network.event.*;
+
+/**
+ * Maps SIP Communicator typing notifications to those going and coming from
+ * smack lib.
+ *
+ * @author Damian Minkov
+ */
+public class OperationSetTypingNotificationsYahooImpl
+    implements OperationSetTypingNotifications
+{
+    private static final Logger logger =
+        Logger.getLogger(OperationSetTypingNotificationsYahooImpl.class);
+
+    /**
+     * All currently registered TN listeners.
+     */
+    private List typingNotificationsListeners = new ArrayList();
+
+    /**
+     * The provider that created us.
+     */
+    private ProtocolProviderServiceYahooImpl yahooProvider = null;
+
+    /**
+     * An active instance of the opSetPersPresence operation set. We're using
+     * it to map incoming events to contacts in our contact list.
+     */
+    private OperationSetPersistentPresenceYahooImpl opSetPersPresence = null;
+
+    /**
+     * @param provider a ref to the <tt>ProtocolProviderServiceImpl</tt>
+     * that created us and that we'll use for retrieving the underlying aim
+     * connection.
+     */
+    OperationSetTypingNotificationsYahooImpl(
+        ProtocolProviderServiceYahooImpl provider)
+    {
+        this.yahooProvider = provider;
+        provider.addRegistrationStateChangeListener(new ProviderRegListener());
+    }
+
+    /**
+     * Adds <tt>l</tt> to the list of listeners registered for receiving
+     * <tt>TypingNotificationEvent</tt>s
+     *
+     * @param l the <tt>TypingNotificationsListener</tt> listener that we'd
+     *   like to add
+     *   method
+     */
+    public void addTypingNotificationsListener(TypingNotificationsListener l)
+    {
+        synchronized(typingNotificationsListeners)
+        {
+            typingNotificationsListeners.add(l);
+        }
+    }
+
+    /**
+     * Removes <tt>l</tt> from the list of listeners registered for receiving
+     * <tt>TypingNotificationEvent</tt>s
+     *
+     * @param l the <tt>TypingNotificationsListener</tt> listener that we'd
+     *   like to remove
+     */
+    public void removeTypingNotificationsListener(TypingNotificationsListener l)
+    {
+        synchronized(typingNotificationsListeners)
+        {
+            typingNotificationsListeners.remove(l);
+        }
+    }
+
+    /**
+     * Delivers a <tt>TypingNotificationEvent</tt> to all registered listeners.
+     * @param sourceContact the contact who has sent the notification.
+     * @param evtCode the code of the event to deliver.
+     */
+    private void fireTypingNotificationsEvent(Contact sourceContact
+                                              ,int evtCode)
+    {
+        logger.debug("Dispatching a TypingNotif. event to "
+            + typingNotificationsListeners.size()+" listeners. Contact "
+            + sourceContact.getAddress() + " has now a typing status of "
+            + evtCode);
+
+        TypingNotificationEvent evt = new TypingNotificationEvent(
+            sourceContact, evtCode);
+
+        Iterator listeners = null;
+        synchronized (typingNotificationsListeners)
+        {
+            listeners = new ArrayList(typingNotificationsListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            TypingNotificationsListener listener
+                = (TypingNotificationsListener) listeners.next();
+
+              listener.typingNotificationReceifed(evt);
+        }
+    }
+
+    /**
+     * Sends a notification to <tt>notifiedContatct</tt> that we have entered
+     * <tt>typingState</tt>.
+     *
+     * @param notifiedContact the <tt>Contact</tt> to notify
+     * @param typingState the typing state that we have entered.
+     *
+     * @throws java.lang.IllegalStateException if the underlying stack is
+     * not registered and initialized.
+     * @throws java.lang.IllegalArgumentException if <tt>notifiedContact</tt> is
+     * not an instance belonging to the underlying implementation.
+     */
+    public void sendTypingNotification(Contact notifiedContact, int typingState)
+        throws IllegalStateException, IllegalArgumentException
+    {
+        assertConnected();
+
+        if( !(notifiedContact instanceof ContactYahooImpl) )
+           throw new IllegalArgumentException(
+               "The specified contact is not an yahoo contact." + notifiedContact);
+
+       if(typingState == OperationSetTypingNotifications.STATE_TYPING)
+       {
+           yahooProvider.getYahooSession().
+               keyTyped(notifiedContact.getAddress());
+       }
+    }
+
+    /**
+     * Utility method throwing an exception if the stack is not properly
+     * initialized.
+     * @throws java.lang.IllegalStateException if the underlying stack is
+     * not registered and initialized.
+     */
+    private void assertConnected() throws IllegalStateException
+    {
+        if (yahooProvider == null)
+            throw new IllegalStateException(
+                "The yahoo provider must be non-null and signed on the "
+                +"service before being able to communicate.");
+        if (!yahooProvider.isRegistered())
+            throw new IllegalStateException(
+                "The yahoo provider must be signed on the service before "
+                +"being able to communicate.");
+    }
+    
+    private class TypingListener
+        extends SessionAdapter
+    {
+        public void notifyReceived(SessionNotifyEvent evt) 
+        {
+            if(evt.isTyping())
+            {
+                String typingUserID = evt.getFrom();
+
+                if(typingUserID != null)
+                {
+                    Contact sourceContact = 
+                        opSetPersPresence.findContactByID(typingUserID);
+
+                    if(sourceContact == null)
+                        return;
+                    
+                    // typing on
+                    if(evt.getMode() == 1)
+                        fireTypingNotificationsEvent(sourceContact, STATE_TYPING);
+                    else
+                        fireTypingNotificationsEvent(sourceContact, STATE_STOPPED);
+                }    
+            }
+        }
+    }
+
+    /**
+     * Our listener that will tell us when we're registered and
+     * ready to accept us as a listener.
+     */
+    private class ProviderRegListener
+        implements RegistrationStateChangeListener
+    {
+        /**
+         * The method is called by a ProtocolProvider implementation whenver
+         * a change in the registration state of the corresponding provider had
+         * occurred.
+         * @param evt ProviderStatusChangeEvent the event describing the status
+         * change.
+         */
+        public void registrationStateChanged(RegistrationStateChangeEvent evt)
+        {
+            logger.debug("The provider changed state from: "
+                         + evt.getOldState()
+                         + " to: " + evt.getNewState());
+            if (evt.getNewState() == RegistrationState.REGISTERED)
+            {
+                opSetPersPresence = (OperationSetPersistentPresenceYahooImpl)
+                    yahooProvider.getSupportedOperationSets()
+                        .get(OperationSetPersistentPresence.class.getName());
+                
+                yahooProvider.getYahooSession().addSessionListener(new TypingListener());
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderFactoryYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderFactoryYahooImpl.java
new file mode 100644
index 0000000..b037a6f
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderFactoryYahooImpl.java
@@ -0,0 +1,264 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.util.*;
+
+import org.osgi.framework.*;
+import net.java.sip.communicator.service.protocol.*;
+
+/**
+ * The Yahoo implementation of the ProtocolProviderFactory.
+ * @author Damian Minkov
+ */
+public class ProtocolProviderFactoryYahooImpl
+    extends ProtocolProviderFactory
+{
+    /**
+     * The table that we store our accounts in.
+     */
+    private Hashtable registeredAccounts = new Hashtable();
+
+    /**
+     * Creates an instance of the ProtocolProviderFactoryYahooImpl.
+     */
+    protected ProtocolProviderFactoryYahooImpl()
+    {
+    }
+
+    /**
+     * Returns a copy of the list containing all accounts currently
+     * registered in this protocol provider.
+     *
+     * @return a copy of the llist containing all accounts currently installed
+     * in the protocol provider.
+     */
+    public ArrayList getRegisteredAccounts()
+    {
+        return new ArrayList(registeredAccounts.keySet());
+    }
+
+    /**
+     * Returns the ServiceReference for the protocol provider corresponding to
+     * the specified accountID or null if the accountID is unknown.
+     * @param accountID the accountID of the protocol provider we'd like to get
+     * @return a ServiceReference object to the protocol provider with the
+     * specified account id and null if the account id is unknwon to the
+     * provider factory.
+     */
+    public ServiceReference getProviderForAccount(AccountID accountID)
+    {
+        ServiceRegistration registration
+            = (ServiceRegistration)registeredAccounts.get(accountID);
+
+        return (registration == null )
+                    ? null
+                    : registration.getReference();
+    }
+
+    /**
+     * Initializes and creates an account corresponding to the specified
+     * accountProperties and registers the resulting ProtocolProvider in the
+     * <tt>context</tt> BundleContext parameter. This method has a persistent
+     * effect. Once created the resulting account will remain installed until
+     * removed through the uninstall account method.
+     *
+     * @param userIDStr the user identifier for the new account
+     * @param accountProperties a set of protocol (or implementation)
+     *   specific properties defining the new account.
+     * @return the AccountID of the newly created account
+     */
+    public AccountID installAccount( String userIDStr,
+                                     Map accountProperties)
+    {
+        BundleContext context
+            = YahooActivator.getBundleContext();
+        if (context == null)
+            throw new NullPointerException("The specified BundleContext was null");
+
+        if (userIDStr == null)
+            throw new NullPointerException("The specified AccountID was null");
+
+        if (accountProperties == null)
+            throw new NullPointerException("The specified property map was null");
+
+        accountProperties.put(USER_ID, userIDStr);
+
+        AccountID accountID = new YahooAccountID(userIDStr, accountProperties);
+
+        //make sure we haven't seen this account id before.
+        if( registeredAccounts.containsKey(accountID) )
+            throw new IllegalStateException(
+                "An account for id " + userIDStr + " was already installed!");
+
+        //first store the account and only then load it as the load generates
+        //an osgi event, the osgi event triggers (trhgough the UI) a call to
+        //the register() method and it needs to acces the configuration service
+        //and check for a password.
+        this.storeAccount(
+            YahooActivator.getBundleContext()
+            , accountID);
+
+        accountID = loadAccount(accountProperties);
+
+        return accountID;
+    }
+
+    /**
+     * Initializes and creates an account corresponding to the specified
+     * accountProperties and registers the resulting ProtocolProvider in the
+     * <tt>context</tt> BundleContext parameter.
+     *
+     * @param accountProperties a set of protocol (or implementation)
+     *   specific properties defining the new account.
+     * @return the AccountID of the newly created account
+     */
+    public AccountID loadAccount( Map accountProperties)
+    {
+        BundleContext context
+            = YahooActivator.getBundleContext();
+        if(context == null)
+            throw new NullPointerException("The specified BundleContext was null");
+
+        String userIDStr = (String)accountProperties.get(USER_ID);
+
+        AccountID accountID = new YahooAccountID(userIDStr, accountProperties);
+
+        //get a reference to the configuration service and register whatever
+        //properties we have in it.
+
+        Hashtable properties = new Hashtable();
+        properties.put(PROTOCOL, ProtocolNames.YAHOO);
+        properties.put(USER_ID, userIDStr);
+
+        ProtocolProviderServiceYahooImpl yahooProtocolProvider
+            = new ProtocolProviderServiceYahooImpl();
+
+        yahooProtocolProvider.initialize(userIDStr, accountID);
+
+        ServiceRegistration registration
+            = context.registerService( ProtocolProviderService.class.getName(),
+                                       yahooProtocolProvider,
+                                       properties);
+
+        registeredAccounts.put(accountID, registration);
+        return accountID;
+    }
+
+
+    /**
+     * Removes the specified account from the list of accounts that this
+     * provider factory is handling. If the specified accountID is unknown to
+     * the ProtocolProviderFactory, the call has no effect and false is returned.
+     * This method is persistent in nature and once called the account
+     * corresponding to the specified ID will not be loaded during future runs
+     * of the project.
+     *
+     * @param accountID the ID of the account to remove.
+     * @return true if an account with the specified ID existed and was removed
+     * and false otherwise.
+     */
+    public boolean uninstallAccount(AccountID accountID)
+    {
+        ServiceRegistration registration
+            = (ServiceRegistration)registeredAccounts.remove(accountID);
+
+        if(registration == null)
+            return false;
+
+        //kill the service
+        registration.unregister();
+
+        return removeStoredAccount(
+            YahooActivator.getBundleContext()
+            , accountID);
+    }
+
+    /**
+     * Loads (and hence installs) all accounts previously stored in the
+     * configuration service.
+     */
+    public void loadStoredAccounts()
+    {
+        super.loadStoredAccounts( YahooActivator.getBundleContext());
+    }
+
+    /**
+     * Prepares the factory for bundle shutdown.
+     */
+    public void stop()
+    {
+        Enumeration registrations = this.registeredAccounts.elements();
+
+        while(registrations.hasMoreElements())
+        {
+            ServiceRegistration reg
+                = ((ServiceRegistration)registrations.nextElement());
+
+            reg.unregister();
+        }
+
+        Enumeration idEnum = registeredAccounts.keys();
+
+        while(idEnum.hasMoreElements())
+        {
+            registeredAccounts.remove(idEnum.nextElement());
+        }
+    }
+
+    /**
+     * Returns the configuraiton service property name prefix that we use to
+     * store properties concerning the account with the specified id.
+     * @param accountID the AccountID whose property name prefix we're looking
+     * for.
+     * @return the prefix  of the configuration service property name that
+     * we're using when storing properties for the specified account.
+     */
+    public String findAccountPrefix(AccountID accountID)
+    {
+        return super.findAccountPrefix(YahooActivator.getBundleContext()
+                                       , accountID);
+    }
+
+    /**
+     * Saves the password for the specified account after scrambling it a bit
+     * so that it is not visible from first sight (Method remains highly
+     * insecure).
+     *
+     * @param accountID the AccountID for the account whose password we're
+     * storing.
+     * @param passwd the password itself.
+     *
+     * @throws java.lang.IllegalArgumentException if no account corresponding
+     * to <tt>accountID</tt> has been previously stored.
+     */
+    public void storePassword(AccountID accountID, String passwd)
+        throws IllegalArgumentException
+    {
+        super.storePassword(YahooActivator.getBundleContext()
+                            , accountID
+                            , passwd);
+    }
+
+    /**
+     * Returns the password last saved for the specified account.
+     *
+     * @param accountID the AccountID for the account whose password we're
+     * looking for..
+     *
+     * @return a String containing the password for the specified accountID.
+     *
+     * @throws java.lang.IllegalArgumentException if no account corresponding
+     * to <tt>accountID</tt> has been previously stored.
+     */
+    public String loadPassword(AccountID accountID)
+        throws IllegalArgumentException
+    {
+        return super.loadPassword(YahooActivator.getBundleContext()
+                                  , accountID );
+    }
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderServiceYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderServiceYahooImpl.java
new file mode 100644
index 0000000..eb08dc6
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderServiceYahooImpl.java
@@ -0,0 +1,494 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.io.*;
+import java.util.*;
+import java.nio.channels.*;
+import net.java.sip.communicator.service.protocol.*;
+import net.java.sip.communicator.service.protocol.event.*;
+import net.java.sip.communicator.util.*;
+import ymsg.network.*;
+import ymsg.network.event.*;
+
+/**
+ * An implementation of the protocol provider service over the Yahoo protocol
+ *
+ * @author Damian Minkov
+ */
+public class ProtocolProviderServiceYahooImpl
+    implements ProtocolProviderService
+{
+    private static final Logger logger =
+        Logger.getLogger(ProtocolProviderServiceYahooImpl.class);
+
+    /**
+     * The hashtable with the operation sets that we support locally.
+     */
+    private Hashtable supportedOperationSets = new Hashtable();
+
+    private YahooSession yahooSession = null;
+
+    /**
+     * indicates whether or not the provider is initialized and ready for use.
+     */
+    private boolean isInitialized = false;
+
+    /**
+     * We use this to lock access to initialization.
+     */
+    private Object initializationLock = new Object();
+
+    /**
+     * A list of all listeners registered for
+     * <tt>RegistrationStateChangeEvent</tt>s.
+     */
+    private List registrationListeners = new ArrayList();
+
+    /**
+     * The identifier of the account that this provider represents.
+     */
+    private AccountID accountID = null;
+
+    /**
+     * Used when we need to re-register
+     */
+    private SecurityAuthority authority = null;
+
+    private OperationSetPersistentPresenceYahooImpl persistentPresence = null;
+
+    private OperationSetTypingNotificationsYahooImpl typingNotifications = null;
+
+    /**
+     * Returns the state of the registration of this protocol provider
+     * @return the <tt>RegistrationState</tt> that this provider is
+     * currently in or null in case it is in a unknown state.
+     */
+    public RegistrationState getRegistrationState()
+    {
+        if(yahooSession != null && 
+            yahooSession.getSessionStatus() == StatusConstants.MESSAGING)
+            return RegistrationState.REGISTERED;
+        else
+            return RegistrationState.UNREGISTERED;
+    }
+
+    /**
+     * Starts the registration process. Connection details such as
+     * registration server, user name/number are provided through the
+     * configuration service through implementation specific properties.
+     *
+     * @param authority the security authority that will be used for resolving
+     *        any security challenges that may be returned during the
+     *        registration or at any moment while wer're registered.
+     * @throws OperationFailedException with the corresponding code it the
+     * registration fails for some reason (e.g. a networking error or an
+     * implementation problem).
+     */
+    public void register(final SecurityAuthority authority)
+        throws OperationFailedException
+    {       
+        if(authority == null)
+            throw new IllegalArgumentException(
+                "The register method needs a valid non-null authority impl "
+                + " in order to be able and retrieve passwords.");
+
+        this.authority = authority;
+
+        connectAndLogin(authority);
+    }
+
+    /**
+     * Connects and logins to the server
+     * @param authority SecurityAuthority
+     * @throws XMPPException if we cannot connect to the server - network problem
+     * @throws  OperationFailedException if login parameters
+     *          as server port are not correct
+     */
+    private void connectAndLogin(SecurityAuthority authority)
+        throws OperationFailedException
+    {
+        synchronized(initializationLock)
+        {
+            //verify whether a password has already been stored for this account
+            String password = YahooActivator.
+                getProtocolProviderFactory().loadPassword(getAccountID());
+
+            //decode
+            if (password == null)
+            {
+                //create a default credentials object
+                UserCredentials credentials = new UserCredentials();
+                credentials.setUserName(getAccountID().getUserID());
+
+                //request a password from the user
+                credentials = authority.obtainCredentials(ProtocolNames.YAHOO
+                    , credentials);
+
+                //extract the password the user passed us.
+                char[] pass = credentials.getPassword();
+
+                // the user didn't provide us a password (canceled the operation)
+                if(pass == null)
+                {
+                    fireRegistrationStateChanged(
+                        getRegistrationState(),
+                        RegistrationState.UNREGISTERED,
+                        RegistrationStateChangeEvent.REASON_USER_REQUEST, "");
+                    return;
+                }
+                password = new String(pass);
+
+
+                if (credentials.isPasswordPersistent())
+                {
+                    YahooActivator.getProtocolProviderFactory()
+                        .storePassword(getAccountID(), password);
+                }
+            }
+
+            yahooSession = new YahooSession();
+            yahooSession.addSessionListener(new YahooConnectionListener());
+            
+            try
+            {
+                yahooSession.login(getAccountID().getUserID(), password);
+
+                if(yahooSession.getSessionStatus()==StatusConstants.MESSAGING)
+                {
+                    persistentPresence.fireProviderPresenceStatusChangeEvent(
+                        persistentPresence.getPresenceStatus(), 
+                        persistentPresence.yahooStatusToPresenceStatus(
+                            yahooSession.getStatus()));
+                    
+                    fireRegistrationStateChanged(
+                        getRegistrationState(),
+                        RegistrationState.REGISTERED,
+                        RegistrationStateChangeEvent.REASON_NOT_SPECIFIED, null);
+                }
+                else
+                {
+                    fireRegistrationStateChanged(
+                        getRegistrationState(),
+                        RegistrationState.UNREGISTERED,
+                        RegistrationStateChangeEvent.REASON_NOT_SPECIFIED, null);
+                }
+            }
+            catch (LoginRefusedException ex)
+            {
+                fireRegistrationStateChanged(
+                    getRegistrationState(),
+                    RegistrationState.AUTHENTICATION_FAILED,
+                    RegistrationStateChangeEvent.REASON_AUTHENTICATION_FAILED, null);
+            }
+            catch (IOException ex)
+            {
+                fireRegistrationStateChanged(
+                    getRegistrationState(),
+                    RegistrationState.CONNECTION_FAILED,
+                    RegistrationStateChangeEvent.REASON_NOT_SPECIFIED, null);
+            }
+        }
+    }
+
+    /**
+     * Ends the registration of this protocol provider with the service.
+     */
+    public void unregister()
+    {
+        unregister(true);
+    }
+
+    /**
+     * Unregister and fire the event if requested
+     * @param fireEvent boolean
+     */
+    void unregister(boolean fireEvent)
+    {
+        RegistrationState currRegState = getRegistrationState();
+        
+        try
+        {
+            yahooSession.logout();
+        }
+        catch(Exception ex)
+        {
+            logger.error("Cannot logout!");
+        }
+        
+        yahooSession.reset();
+
+        if(fireEvent)
+        {
+            fireRegistrationStateChanged(
+                currRegState,
+                RegistrationState.UNREGISTERED,
+                RegistrationStateChangeEvent.REASON_USER_REQUEST, null);
+        }
+    }
+
+    /**
+     * Indicates whether or not this provider is signed on the service
+     * @return true if the provider is currently signed on (and hence online)
+     * and false otherwise.
+     */
+    public boolean isRegistered()
+    {
+        return getRegistrationState().equals(RegistrationState.REGISTERED);
+    }
+
+    /**
+     * Returns the short name of the protocol that the implementation of this
+     * provider is based upon (like SIP, Msn, ICQ/AIM, or others for
+     * example).
+     *
+     * @return a String containing the short name of the protocol this
+     *   service is taking care of.
+     */
+    public String getProtocolName()
+    {
+        return ProtocolNames.YAHOO;
+    }
+
+    /**
+     * Returns an array containing all operation sets supported by the
+     * current implementation.
+     *
+     * @return an array of OperationSet-s supported by this protocol
+     *   provider implementation.
+     */
+    public Map getSupportedOperationSets()
+    {
+        return supportedOperationSets;
+    }
+
+    /**
+     * Returns the operation set corresponding to the specified class or null
+     * if this operation set is not supported by the provider implementation.
+     *
+     * @param opsetClass the <tt>Class</tt>  of the operation set that we're
+     * looking for.
+     * @return returns an OperationSet of the specified <tt>Class</tt> if the
+     * undelying implementation supports it or null otherwise.
+     */
+    public OperationSet getOperationSet(Class opsetClass)
+    {
+        return (OperationSet)getSupportedOperationSets()
+            .get(opsetClass.getName());
+    }
+
+    /**
+     * Initialized the service implementation, and puts it in a sate where it
+     * could interoperate with other services. It is strongly recomended that
+     * properties in this Map be mapped to property names as specified by
+     * <tt>AccountProperties</tt>.
+     *
+     * @param screenname the account id/uin/screenname of the account that
+     * we're about to create
+     * @param accountID the identifier of the account that this protocol
+     * provider represents.
+     *
+     * @see net.java.sip.communicator.service.protocol.AccountID
+     */
+    protected void initialize(String screenname,
+                              AccountID accountID)
+    {
+        synchronized(initializationLock)
+        {
+            this.accountID = accountID;
+
+            //initialize the presence operationset
+            persistentPresence = new OperationSetPersistentPresenceYahooImpl(this);
+
+            supportedOperationSets.put(
+                OperationSetPersistentPresence.class.getName(),
+                persistentPresence);
+
+            //register it once again for those that simply need presence
+            supportedOperationSets.put( OperationSetPresence.class.getName(),
+                                        persistentPresence);
+
+            //initialize the IM operation set
+            OperationSetBasicInstantMessagingYahooImpl basicInstantMessaging =
+                new OperationSetBasicInstantMessagingYahooImpl(this);
+
+            supportedOperationSets.put(
+                OperationSetBasicInstantMessaging.class.getName(),
+                basicInstantMessaging);
+
+            //initialize the typing notifications operation set
+            typingNotifications =
+                new OperationSetTypingNotificationsYahooImpl(this);
+
+            supportedOperationSets.put(
+                OperationSetTypingNotifications.class.getName(),
+                typingNotifications);
+
+            isInitialized = true;
+        }
+    }
+
+    /**
+     * Makes the service implementation close all open sockets and release
+     * any resources that it might have taken and prepare for
+     * shutdown/garbage collection.
+     */
+    public void shutdown()
+    {
+        synchronized(initializationLock){
+            unregister(false);
+            yahooSession = null;
+            isInitialized = false;
+        }
+    }
+
+    /**
+     * Returns true if the provider service implementation is initialized and
+     * ready for use by other services, and false otherwise.
+     *
+     * @return true if the provider is initialized and ready for use and false
+     * otherwise
+     */
+    public boolean isInitialized()
+    {
+        return isInitialized;
+    }
+
+    /**
+     * Removes the specified registration state change listener so that it does
+     * not receive any further notifications upon changes of the
+     * RegistrationState of this provider.
+     *
+     * @param listener the listener to register for
+     * <tt>RegistrationStateChangeEvent</tt>s.
+     */
+    public void removeRegistrationStateChangeListener(
+        RegistrationStateChangeListener listener)
+    {
+        synchronized(registrationListeners)
+        {
+            registrationListeners.remove(listener);
+        }
+    }
+
+    /**
+     * Registers the specified listener with this provider so that it would
+     * receive notifications on changes of its state or other properties such
+     * as its local address and display name.
+     *
+     * @param listener the listener to register.
+     */
+    public void addRegistrationStateChangeListener(
+        RegistrationStateChangeListener listener)
+    {
+        synchronized(registrationListeners)
+        {
+            if (!registrationListeners.contains(listener))
+                registrationListeners.add(listener);
+        }
+    }
+
+    /**
+     * Returns the AccountID that uniquely identifies the account represented
+     * by this instance of the ProtocolProviderService.
+     * @return the id of the account represented by this provider.
+     */
+    public AccountID getAccountID()
+    {
+        return accountID;
+    }
+
+    /**
+     * Returns the Yahoo<tt>Session</tt>opened by this provider
+     * @return a reference to the <tt>Session</tt> last opened by this
+     * provider.
+     */
+    YahooSession getYahooSession()
+    {
+        return yahooSession;
+    }
+
+    /**
+     * Creates a RegistrationStateChange event corresponding to the specified
+     * old and new states and notifies all currently registered listeners.
+     *
+     * @param oldState the state that the provider had before the change
+     * occurred
+     * @param newState the state that the provider is currently in.
+     * @param reasonCode a value corresponding to one of the REASON_XXX fields
+     * of the RegistrationStateChangeEvent class, indicating the reason for
+     * this state transition.
+     * @param reason a String further explaining the reason code or null if
+     * no such explanation is necessary.
+     */
+    void fireRegistrationStateChanged( RegistrationState oldState,
+                                               RegistrationState newState,
+                                               int               reasonCode,
+                                               String            reason)
+    {
+        RegistrationStateChangeEvent event =
+            new RegistrationStateChangeEvent(
+                            this, oldState, newState, reasonCode, reason);
+
+        logger.debug("Dispatching " + event + " to "
+                     + registrationListeners.size()+ " listeners.");
+
+        if(newState.equals(RegistrationState.UNREGISTERED) ||
+            newState.equals(RegistrationState.CONNECTION_FAILED))
+        {
+            unregister(false);
+            yahooSession = null;
+        }
+
+        Iterator listeners = null;
+        synchronized (registrationListeners)
+        {
+            listeners = new ArrayList(registrationListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            RegistrationStateChangeListener listener
+                = (RegistrationStateChangeListener) listeners.next();
+
+            listener.registrationStateChanged(event);
+        }
+
+        logger.trace("Done.");
+    }
+
+    /**
+     * Listens when we are logged in the server
+     * or incoming exception in the lib impl.
+     */
+    private class YahooConnectionListener
+        extends SessionAdapter
+    {
+        /**
+         * Yahoo has logged us off the system, or the connection was lost
+         **/
+        public void connectionClosed(SessionEvent ev)
+        {
+            unregister(false);
+            if(isRegistered())
+                fireRegistrationStateChanged(
+                    getRegistrationState(),
+                    RegistrationState.CONNECTION_FAILED,
+                    RegistrationStateChangeEvent.REASON_NOT_SPECIFIED, null);
+        }
+        
+        public void inputExceptionThrown(SessionExceptionEvent ev)
+        {
+            unregister(false);
+            if(isRegistered())
+                fireRegistrationStateChanged(
+                    getRegistrationState(),
+                    RegistrationState.UNREGISTERED,
+                    RegistrationStateChangeEvent.REASON_INTERNAL_ERROR, null);            
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/RootContactGroupYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/RootContactGroupYahooImpl.java
new file mode 100644
index 0000000..2ce9df8
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/RootContactGroupYahooImpl.java
@@ -0,0 +1,301 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.util.*;
+
+import net.java.sip.communicator.service.protocol.*;
+
+/**
+ * A dummy ContactGroup implementation representing the ContactList root for
+ * Yahoo contact lists.
+ * @author Damian Minkov
+ */
+public class RootContactGroupYahooImpl
+    extends AbstractContactGroupYahooImpl
+{
+    private String ROOT_CONTACT_GROUP_NAME = "ContactListRoot";
+    private List subGroups = new LinkedList();
+    private boolean isResolved = false;
+
+    /**
+     * An empty list that we use when returning an iterator.
+     */
+    private List dummyContacts = new LinkedList();
+
+    private ProtocolProviderServiceYahooImpl ownerProvider = null;
+
+    /**
+     * Creates a ContactGroup instance.
+     */
+    RootContactGroupYahooImpl(){}
+
+    /**
+     * Sets the currently valid provider
+     * @param ownerProvider ProtocolProviderServiceImpl
+     */
+    void setOwnerProvider(ProtocolProviderServiceYahooImpl ownerProvider)
+    {
+        this.ownerProvider = ownerProvider;
+    }
+
+    /**
+     * The ContactListRoot is the only group that can contain subgroups.
+     *
+     * @return true (always)
+     */
+    public boolean canContainSubgroups()
+    {
+        return true;
+    }
+
+    /**
+     * Returns the name of this group which is always
+     * <tt>ROOT_CONTACT_GROUP_NAME</tt>.
+     *
+     * @return a String containing the name of this group.
+     */
+    public String getGroupName()
+    {
+        return ROOT_CONTACT_GROUP_NAME;
+    }
+
+    /**
+     * Adds the specified group to the end of the list of sub groups.
+     * @param group the group to add.
+     */
+    void addSubGroup(ContactGroupYahooImpl group)
+    {
+        subGroups.add(group);
+    }
+
+    /**
+     * Removes the specified from the list of sub groups
+     * @param group the group to remove.
+     */
+    void removeSubGroup(ContactGroupYahooImpl group)
+    {
+        removeSubGroup(subGroups.indexOf(group));
+    }
+
+    /**
+     * Removes the sub group with the specified index.
+     * @param index the index of the group to remove
+     */
+    void removeSubGroup(int index)
+    {
+        subGroups.remove(index);
+    }
+
+    /**
+     * Removes all contact sub groups and reinsterts them as specified
+     * by the <tt>newOrder</tt> param. Contact groups not contained in the
+     * newOrder list are left at the end of this group.
+     *
+     * @param newOrder a list containing all contact groups in the order that is
+     * to be applied.
+     *
+     */
+    void reorderSubGroups(List newOrder)
+    {
+        subGroups.removeAll(newOrder);
+        subGroups.addAll(0, newOrder);
+    }
+
+    /**
+     * Returns the number of subgroups contained by this
+     * <tt>RootContactGroupImpl</tt>.
+     *
+     * @return an int indicating the number of subgroups that this
+     *   ContactGroup contains.
+     */
+    public int countSubgroups()
+    {
+        return subGroups.size();
+    }
+
+    /**
+     * Returns null as this is the root contact group.
+     * @return null as this is the root contact group.
+     */
+    public ContactGroup getParentContactGroup()
+    {
+        return null;
+    }
+
+    /**
+     * Returns the subgroup with the specified index.
+     *
+     * @param index the index of the <tt>ContactGroup</tt> to retrieve.
+     * @return the <tt>ContactGroup</tt> with the specified index.
+     */
+    public ContactGroup getGroup(int index)
+    {
+        return (ContactGroupYahooImpl) subGroups.get(index);
+    }
+
+    /**
+     * Returns the subgroup with the specified name.
+     * @param groupName the name of the <tt>ContactGroup</tt> to retrieve.
+     * @return the <tt>ContactGroup</tt> with the specified index.
+     */
+    public ContactGroup getGroup(String groupName)
+    {
+        Iterator subgroups = subgroups();
+        while (subgroups.hasNext())
+        {
+            ContactGroupYahooImpl grp = (ContactGroupYahooImpl) subgroups.next();
+
+            if (grp.getGroupName().equals(groupName))
+                return grp;
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns an iterator over the sub groups that this
+     * <tt>ContactGroup</tt> contains.
+     *
+     * @return a java.util.Iterator over the <tt>ContactGroup</tt>
+     *   children of this group (i.e. subgroups).
+     */
+    public Iterator subgroups()
+    {
+        return subGroups.iterator();
+    }
+
+    /**
+     * Returns the number, which is always 0, of <tt>Contact</tt> members
+     * of this <tt>ContactGroup</tt>
+     * @return an int indicating the number of <tt>Contact</tt>s, members
+     * of this <tt>ContactGroup</tt>.
+     */
+    public int countContacts()
+    {
+        return dummyContacts.size();
+    }
+
+    /**
+     * Returns an Iterator over all contacts, member of this
+     * <tt>ContactGroup</tt>.
+     * @return a java.util.Iterator over all contacts inside this
+     * <tt>ContactGroup</tt>
+     */
+    public Iterator contacts()
+    {
+        return dummyContacts.iterator();
+    }
+
+    /**
+     * A dummy impl of the corresponding interface method - always returns null.
+     *
+     * @param index the index of the <tt>Contact</tt> to return.
+     * @return the <tt>Contact</tt> with the specified index, i.e. always
+     * null.
+     */
+    public Contact getContact(int index)
+    {
+        return null;
+    }
+
+    /**
+     * Returns the <tt>Contact</tt> with the specified address or
+     * identifier.
+     * @param id the addres or identifier of the <tt>Contact</tt> we are
+     * looking for.
+     * @return the <tt>Contact</tt> with the specified id or address.
+     */
+    public Contact getContact(String id)
+    {
+        //no contacts in the root group for this yahoo impl.
+        return null;
+    }
+
+
+    /**
+     * Returns a string representation of the root contact group that contains
+     * all subgroups and subcontacts of this group.
+     *
+     * @return  a string representation of this root contact group.
+     */
+    public String toString()
+    {
+        StringBuffer buff = new StringBuffer(getGroupName());
+        buff.append(".subGroups=" + countSubgroups() + ":\n");
+
+        Iterator subGroups = subgroups();
+        while (subGroups.hasNext())
+        {
+            ContactGroup group = (ContactGroup) subGroups.next();
+            buff.append(group.toString());
+            if (subGroups.hasNext())
+                buff.append("\n");
+        }
+        return buff.toString();
+    }
+
+    /**
+     * Returns the protocol provider that this group belongs to.
+     * @return a regerence to the ProtocolProviderService instance that this
+     * ContactGroup belongs to.
+     */
+    public ProtocolProviderService getProtocolProvider()
+    {
+        return this.ownerProvider;
+    }
+
+    /**
+     * Determines whether or not this contact group is being stored by the
+     * server. Non persistent contact groups exist for the sole purpose of
+     * containing non persistent contacts.
+     * @return true if the contact group is persistent and false otherwise.
+     */
+    public boolean isPersistent()
+    {
+        return true;
+    }
+
+    /**
+     * Returns null as no persistent data is required and the group name is
+     * sufficient for restoring the contact.
+     * <p>
+     * @return null as no such data is needed.
+     */
+    public String getPersistentData()
+    {
+        return null;
+    }
+
+    /**
+     * Determines whether or not this group has been resolved against the
+     * server. Unresolved groups are used when initially loading a contact
+     * list that has been stored in a local file until the presence operation
+     * set has managed to retrieve all the contact list from the server and has
+     * properly mapped groups to their on-line buddies.
+     * @return true if the group has been resolved (mapped against a buddy)
+     * and false otherwise.
+     */
+    public boolean isResolved()
+    {
+        return isResolved;
+    }
+
+    /**
+     * Returns a <tt>String</tt> that uniquely represnets the group. In this we
+     * use the name of the group as an identifier. This may cause problems
+     * though, in clase the name is changed by some other application between
+     * consecutive runs of the sip-communicator.
+     *
+     * @return a String representing this group in a unique and persistent
+     * way.
+     */
+    public String getUID()
+    {
+        return getGroupName();
+    }
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/ServerStoredContactListYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/ServerStoredContactListYahooImpl.java
new file mode 100644
index 0000000..699fdce
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/ServerStoredContactListYahooImpl.java
@@ -0,0 +1,1027 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.io.*;
+import java.util.*;
+import net.java.sip.communicator.service.protocol.*;
+import net.java.sip.communicator.service.protocol.event.*;
+import net.java.sip.communicator.util.*;
+import ymsg.network.*;
+import ymsg.network.event.*;
+
+/**
+ * This class encapsulates the Roster class. Once created, it will
+ * register itself as a listener to the encapsulated Roster and modify it's
+ * local copy of Contacts and ContactGroups every time an event is generated
+ * by the underlying framework. The class would also generate
+ * corresponding sip-communicator events to all events coming from smack.
+ *
+ * @author Damian Minkov
+ */
+public class ServerStoredContactListYahooImpl
+{
+    private static final Logger logger =
+        Logger.getLogger(ServerStoredContactListYahooImpl.class);
+
+    /**
+     * The name of the Volatile group
+     */
+    private static final String VOLATILE_GROUP_NAME = "NotInContactList";
+    
+    /**
+     * If there is no group and we add contact with no parent 
+     * a default group is created with name : DEFAULT_GROUP_NAME
+     */
+    private static final String DEFAULT_GROUP_NAME = "General";
+
+    /**
+     * The root contagroup. The container for all yahoo buddies and groups.
+     */
+    private RootContactGroupYahooImpl rootGroup = new RootContactGroupYahooImpl();
+
+    /**
+     * The operation set that created us and that we could use when dispatching
+     * subscription events.
+     */
+    private OperationSetPersistentPresenceYahooImpl parentOperationSet = null;
+
+    /**
+     * The provider that is on top of us.
+     */
+    private ProtocolProviderServiceYahooImpl yahooProvider = null;
+
+    private YahooSession yahooSession = null;
+
+    /**
+     * Listeners that would receive event notifications for changes in group
+     * names or other properties, removal or creation of groups.
+     */
+    private Vector serverStoredGroupListeners = new Vector();
+
+    private ContactListModListenerImpl contactListModListenerImpl
+        = new ContactListModListenerImpl();
+
+    /**
+     * indicates whether or not the contactlist is initialized and ready.
+     */
+    private boolean isInitialized = false;
+    
+    /**
+     * Handler for incoming authorization requests.
+     */
+    private AuthorizationHandler handler = null;
+
+    /**
+     * Creates a ServerStoredContactList wrapper for the specified BuddyList.
+     *
+     * @param parentOperationSet the operation set that created us and that
+     * we could use for dispatching subscription events
+     * @param provider the provider that has instantiated us.
+     */
+    ServerStoredContactListYahooImpl(
+        OperationSetPersistentPresenceYahooImpl parentOperationSet,
+        ProtocolProviderServiceYahooImpl        provider)
+    {
+        //We need to init these as early as possible to ensure that the provider
+        //and the operationsset would not be null in the incoming events.
+        this.parentOperationSet = parentOperationSet;
+
+        this.yahooProvider = provider;
+        rootGroup.setOwnerProvider(provider);
+
+        // listens for provider registered events to set the isInitialized state
+        // of the contact list
+        provider.addRegistrationStateChangeListener(
+            new RegistrationStateChangeListener()
+            {
+                public void registrationStateChanged(
+                    RegistrationStateChangeEvent evt)
+                {
+                    if (evt.getNewState() == RegistrationState.UNREGISTERED
+                        || evt.getNewState() == RegistrationState.AUTHENTICATION_FAILED
+                        || evt.getNewState() == RegistrationState.CONNECTION_FAILED)
+                    {
+                        isInitialized = false;
+                    }
+                }
+            }
+        );
+    }
+    
+    /**
+     * Handler for incoming authorization requests.
+     *
+     * @param handler an instance of an AuthorizationHandler for
+     *   authorization requests coming from other users requesting
+     *   permission add us to their contact list.
+     */
+    public void setAuthorizationHandler(AuthorizationHandler handler)
+    {
+        this.handler = handler;
+    }
+
+    /**
+     * Returns the root group of the contact list.
+     *
+     * @return the root ContactGroup for the ContactList
+     */
+    public ContactGroup getRootGroup()
+    {
+        return rootGroup;
+    }
+
+    /**
+     * Registers the specified group listener so that it would receive events
+     * on group modification/creation/destruction.
+     * @param listener the ServerStoredGroupListener to register for group events
+     */
+    void addGroupListener(ServerStoredGroupListener listener)
+    {
+        synchronized(serverStoredGroupListeners)
+        {
+            if(!serverStoredGroupListeners.contains(listener))
+            this.serverStoredGroupListeners.add(listener);
+        }
+    }
+
+    /**
+     * Removes the specified group listener so that it won't receive further
+     * events on group modification/creation/destruction.
+     * @param listener the ServerStoredGroupListener to unregister
+     */
+    void removeGroupListener(ServerStoredGroupListener listener)
+    {
+        synchronized(serverStoredGroupListeners)
+        {
+            this.serverStoredGroupListeners.remove(listener);
+        }
+    }
+
+    /**
+     * Creates the corresponding event and notifies all
+     * <tt>ServerStoredGroupListener</tt>s that the source group has been
+     * removed, changed, renamed or whatever happened to it.
+     * @param group the ContactGroup that has been created/modified/removed
+     * @param eventID the id of the event to generate.
+     */
+    private void fireGroupEvent(ContactGroupYahooImpl group, int eventID)
+    {
+        //bail out if no one's listening
+        if(parentOperationSet == null){
+            logger.debug("No presence op. set available. Bailing out.");
+            return;
+        }
+
+        ServerStoredGroupEvent evt = new ServerStoredGroupEvent(
+                  group
+                , eventID
+                , parentOperationSet.getServerStoredContactListRoot()
+                , yahooProvider
+                , parentOperationSet);
+
+        logger.trace("Will dispatch the following grp event: " + evt);
+
+        Iterator listeners = null;
+        synchronized (serverStoredGroupListeners)
+        {
+            listeners = new ArrayList(serverStoredGroupListeners).iterator();
+        }
+
+        while (listeners.hasNext())
+        {
+            ServerStoredGroupListener listener
+                = (ServerStoredGroupListener) listeners.next();
+
+            if (eventID == ServerStoredGroupEvent.GROUP_REMOVED_EVENT)
+                listener.groupRemoved(evt);
+            else if (eventID == ServerStoredGroupEvent.GROUP_RENAMED_EVENT)
+                listener.groupNameChanged(evt);
+            else if (eventID == ServerStoredGroupEvent.GROUP_CREATED_EVENT)
+                listener.groupCreated(evt);
+            else if (eventID == ServerStoredGroupEvent.GROUP_RESOLVED_EVENT)
+                listener.groupResolved(evt);
+        }
+    }
+
+    /**
+     * Make the parent persistent presence operation set dispatch a contact
+     * removed event.
+     * @param parentGroup the group where that the removed contact belonged to.
+     * @param contact the contact that was removed.
+     */
+    private void fireContactRemoved( ContactGroup parentGroup,
+                                     ContactYahooImpl contact)
+    {
+        //bail out if no one's listening
+        if(parentOperationSet == null){
+            logger.debug("No presence op. set available. Bailing out.");
+            return;
+        }
+
+        //dispatch
+        parentOperationSet.fireSubscriptionEvent(
+            SubscriptionEvent.SUBSCRIPTION_REMOVED, contact, parentGroup);
+    }
+
+    /**
+     * Make the parent persistent presence operation set dispatch a subscription
+     * moved event.
+     * @param oldParentGroup the group where the source contact was located
+     * before being moved
+     * @param newParentGroup the group that the source contact is currently in.
+     * @param contact the contact that was added
+     */
+    private void fireContactMoved( ContactGroup oldParentGroup,
+                                   ContactGroupYahooImpl newParentGroup,
+                                   ContactYahooImpl contact)
+    {
+        //bail out if no one's listening
+        if(parentOperationSet == null){
+            logger.debug("No presence op. set available. Bailing out.");
+            return;
+        }
+
+        //dispatch
+        parentOperationSet.fireSubscriptionMovedEvent(
+            contact, oldParentGroup, newParentGroup);
+    }
+
+    /**
+     * Retrns a reference to the provider that created us.
+     * @return a reference to a ProtocolProviderServiceImpl instance.
+     */
+    ProtocolProviderServiceYahooImpl getParentProvider()
+    {
+        return yahooProvider;
+    }
+
+    /**
+     * Returns the ConntactGroup with the specified name or null if no such
+     * group was found.
+     * <p>
+     * @param name the name of the group we're looking for.
+     * @return a reference to the ContactGroupYahooImpl instance we're looking for
+     * or null if no such group was found.
+     */
+    public ContactGroupYahooImpl findContactGroup(String name)
+    {
+        Iterator contactGroups = rootGroup.subgroups();
+
+        while(contactGroups.hasNext())
+        {
+            ContactGroupYahooImpl contactGroup
+                = (ContactGroupYahooImpl) contactGroups.next();
+
+            if (contactGroup.getGroupName().equals(name))
+                return contactGroup;
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns the Contact with the specified id or null if
+     * no such id was found.
+     *
+     * @param id the id of the contact to find.
+     * @return the <tt>Contact</tt> carrying the specified
+     * <tt>screenName</tt> or <tt>null</tt> if no such contact exits.
+     */
+    public ContactYahooImpl findContactById(String id)
+    {
+        Iterator contactGroups = rootGroup.subgroups();
+        ContactYahooImpl result = null;
+
+        while(contactGroups.hasNext())
+        {
+            ContactGroupYahooImpl contactGroup
+                = (ContactGroupYahooImpl) contactGroups.next();
+
+            result = contactGroup.findContact(id);
+
+            if (result != null)
+                return result;
+
+        }
+
+        Iterator rootContacts = rootGroup.contacts();
+        while (rootContacts.hasNext())
+        {
+            ContactYahooImpl item = (ContactYahooImpl) rootContacts.next();
+
+            if(item.getAddress().equals(id))
+                return item;
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns the ContactGroup containing the specified contact or null
+     * if no such group or contact exist.
+     *
+     * @param child the contact whose parent group we're looking for.
+     * @return the <tt>ContactGroup</tt> containing the specified
+     * <tt>contact</tt> or <tt>null</tt> if no such groupo or contact
+     * exist.
+     */
+    public ContactGroup findContactGroup(ContactYahooImpl child)
+    {
+        Iterator contactGroups = rootGroup.subgroups();
+
+        while(contactGroups.hasNext())
+        {
+            ContactGroupYahooImpl contactGroup
+                = (ContactGroupYahooImpl) contactGroups.next();
+
+            if( contactGroup.findContact(child.getAddress())!= null)
+                return contactGroup;
+        }
+
+        Iterator contacts = rootGroup.contacts();
+
+        while(contacts.hasNext())
+        {
+            ContactYahooImpl contact = (ContactYahooImpl) contacts.next();
+
+            if( contact.equals(child))
+                return rootGroup;
+        }
+
+        return null;
+    }
+
+    /**
+     * Adds a new contact with the specified screenname to the list under a
+     * default location.
+     * @param id the id of the contact to add.
+     * @throws OperationFailedException
+     */
+    public void addContact(String id)
+        throws OperationFailedException
+    {
+        ContactGroupYahooImpl parent = getFirstPersistentGroup();
+        
+        if(parent == null)
+        {
+            // if there is no group create it
+            parent = createUnresolvedContactGroup(DEFAULT_GROUP_NAME);
+        }
+        
+        addContact(parent, id);
+    }
+
+    /**
+     * Adds a new contact with the specified screenname to the list under the
+     * specified group.
+     * @param id the id of the contact to add.
+     * @param parent the group under which we want the new contact placed.
+     * @throws OperationFailedException if the contact already exist
+     */
+    public void addContact(final ContactGroupYahooImpl parent, final String id)
+        throws OperationFailedException
+    {
+        logger.trace("Adding contact " + id + " to parent=" + parent);
+
+        //if the contact is already in the contact list and is not volatile,
+        //then only broadcast an event
+        ContactYahooImpl existingContact = findContactById(id);
+
+        if( existingContact != null
+            && existingContact.isPersistent() )
+        {
+            logger.debug("Contact " + id + " already exists.");
+            throw new OperationFailedException(
+                "Contact " + id + " already exists.",
+                OperationFailedException.SUBSCRIPTION_ALREADY_EXISTS);
+        }
+        
+        try
+        {
+            yahooSession.addFriend(id, parent.getGroupName());
+        }
+        catch(IOException ex)
+        {
+            throw new OperationFailedException(
+                "Contact cannot be added " + id,
+                OperationFailedException.NETWORK_FAILURE);
+        }
+    }
+
+    /**
+     * Creates a non persistent contact for the specified address. This would
+     * also create (if necessary) a group for volatile contacts that would not
+     * be added to the server stored contact list. This method would have no
+     * effect on the server stored contact list.
+     * @param id the address of the contact to create.
+     * @return the newly created volatile <tt>ContactImpl</tt>
+     */
+    ContactYahooImpl createVolatileContact(String id)
+    {
+         VolatileContactYahooImpl newVolatileContact
+            = new VolatileContactYahooImpl(id, this);
+
+        //Check whether a volatile group already exists and if not create
+        //one
+        ContactGroupYahooImpl theVolatileGroup = getNonPersistentGroup();
+
+        //if the parent group is null then add necessary create the group
+        if (theVolatileGroup == null)
+        {
+            theVolatileGroup = new VolatileContactGroupYahooImpl(
+                VOLATILE_GROUP_NAME, this);
+
+            theVolatileGroup.addContact(newVolatileContact);
+
+            this.rootGroup.addSubGroup(theVolatileGroup);
+
+            fireGroupEvent(theVolatileGroup
+                           , ServerStoredGroupEvent.GROUP_CREATED_EVENT);
+        }
+        else
+        {
+            theVolatileGroup.addContact(newVolatileContact);
+
+            fireContactAdded(theVolatileGroup, newVolatileContact);
+        }
+
+        return newVolatileContact;
+    }
+
+
+    /**
+     * Creates a non resolved contact for the specified address and inside the
+     * specified group. The newly created contact would be added to the local
+     * contact list as a standard contact but when an event is received from the
+     * server concerning this contact, then it will be reused and only its
+     * isResolved field would be updated instead of creating the whole contact
+     * again.
+     *
+     * @param parentGroup the group where the unersolved contact is to be
+     * created
+     * @param id the Address of the contact to create.
+     * @return the newly created unresolved <tt>ContactImpl</tt>
+     */
+    ContactYahooImpl createUnresolvedContact(ContactGroup parentGroup, String id)
+    {
+        ContactYahooImpl newUnresolvedContact
+            = new ContactYahooImpl(id, this, false);
+
+        if(parentGroup instanceof ContactGroupYahooImpl)
+            ((ContactGroupYahooImpl)parentGroup).
+                addContact(newUnresolvedContact);
+        
+        fireContactAdded(parentGroup, newUnresolvedContact);
+
+        return newUnresolvedContact;
+    }
+
+    /**
+     * Creates a non resolved contact group for the specified name. The newly
+     * created group would be added to the local contact list as any other group
+     * but when an event is received from the server concerning this group, then
+     * it will be reused and only its isResolved field would be updated instead
+     * of creating the whole group again.
+     * <p>
+     * @param groupName the name of the group to create.
+     * @return the newly created unresolved <tt>ContactGroupImpl</tt>
+     */
+    ContactGroupYahooImpl createUnresolvedContactGroup(String groupName)
+    {
+        ContactGroupYahooImpl newUnresolvedGroup =
+            new ContactGroupYahooImpl(groupName, this);
+
+        this.rootGroup.addSubGroup(newUnresolvedGroup);
+
+        fireGroupEvent(newUnresolvedGroup
+                        , ServerStoredGroupEvent.GROUP_CREATED_EVENT);
+
+        return newUnresolvedGroup;
+    }
+
+    /**
+     * Creates the specified group on the server stored contact list.
+     * @param groupName a String containing the name of the new group.
+     * @throws OperationFailedException with code CONTACT_GROUP_ALREADY_EXISTS
+     * if the group we're trying to create is already in our contact list.
+     */
+    public void createGroup(String groupName)
+        throws OperationFailedException
+    {
+        logger.trace("Creating group: " + groupName);
+
+        ContactGroupYahooImpl existingGroup = findContactGroup(groupName);
+
+        if( existingGroup != null && existingGroup.isPersistent() )
+        {
+            logger.debug("ContactGroup " + groupName + " already exists.");
+            throw new OperationFailedException(
+                           "ContactGroup " + groupName + " already exists.",
+                OperationFailedException.CONTACT_GROUP_ALREADY_EXISTS);
+        }
+
+        // create unresolved group if friend is added - group will be resolved
+        createUnresolvedContactGroup(groupName);
+    }
+
+    /**
+     * Removes the specified group from the buddy list.
+     * @param groupToRemove the group that we'd like removed.
+     */
+    public void removeGroup(ContactGroupYahooImpl groupToRemove)
+    {
+        // to remove group just remove all the contacts in it
+        
+        logger.trace("removing group " + groupToRemove);
+    
+        // if its not persistent group just remove it
+//        if(!groupToRemove.isPersistent())
+//        {
+//            rootGroup.removeSubGroup(groupToRemove);
+//            fireGroupEvent(groupToRemove, 
+//                ServerStoredGroupEvent.GROUP_REMOVED_EVENT);
+//            return;
+//        }
+        
+        Vector contacts = groupToRemove.getSourceGroup().getMembers();
+        
+        if(contacts.size() == 0)
+        {
+            // the group is empty just remove it
+            rootGroup.removeSubGroup(groupToRemove);
+            fireGroupEvent(groupToRemove, 
+                ServerStoredGroupEvent.GROUP_REMOVED_EVENT);
+            return;
+        }
+        
+        Iterator iter = contacts.iterator();
+        while(iter.hasNext())
+        {
+            YahooUser item =  (YahooUser)iter.next();
+
+            try
+            {
+                yahooSession.removeFriend(item.getId(), groupToRemove.getGroupName());
+            }
+            catch(IOException ex)
+            {
+                logger.info("Cannot Remove contact " + item.getId());
+            }
+        }
+    }
+
+    /**
+     * Removes a contact from the serverside list
+     * Event will come for successful operation
+     * @param contactToRemove ContactYahooImpl
+     */
+    void removeContact(ContactYahooImpl contactToRemove)
+    {
+        logger.trace("Removing yahoo contact " + contactToRemove.getSourceContact());
+        try
+        {
+            yahooSession.removeFriend(
+                contactToRemove.getSourceContact().getId(), 
+                contactToRemove.getParentContactGroup().getGroupName());
+        }
+        catch(IOException ex)
+        {
+            logger.info("Cannot Remove contact " + contactToRemove);
+        }
+    }
+
+    /**
+     * Renames the specified group according to the specified new name..
+     * @param groupToRename the group that we'd like removed.
+     * @param newName the new name of the group
+     */
+    public void renameGroup(ContactGroupYahooImpl groupToRename, String newName)
+    {
+        // not working
+        /*
+            try
+            {
+                yahooSession.renameGroup(groupToRename.getGroupName(), newName);
+            }
+            catch(IOException ex)
+            {
+                logger.info("Cannot rename group " + groupToRename);
+            }
+
+            fireGroupEvent(groupToRename, ServerStoredGroupEvent.GROUP_RENAMED_EVENT);
+         */
+    }
+
+    /**
+     * Moves the specified <tt>contact</tt> to the group indicated by
+     * <tt>newParent</tt>.
+     * @param contact the contact that we'd like moved under the new group.
+     * @param newParent the group where we'd like the parent placed.
+     */
+    public void moveContact(ContactYahooImpl contact,
+                            ContactGroupYahooImpl newParent)
+    {
+        try
+        {
+            contactListModListenerImpl.
+                waitForMove(contact.getSourceContact().getId(), 
+                contact.getParentContactGroup().getGroupName());
+            
+            yahooSession.addFriend(
+                contact.getSourceContact().getId(), 
+                newParent.getGroupName());
+        }
+        catch(IOException ex)
+        {
+            contactListModListenerImpl.
+                removeWaitForMove(contact.getSourceContact().getId());
+            logger.error("Contact cannot be added " + ex.getMessage());
+        }
+    }
+
+    /**
+     * Returns the volatile group
+     *
+     * @return ContactGroupYahooImpl
+     */
+    private ContactGroupYahooImpl getNonPersistentGroup()
+    {
+        for (int i = 0; i < getRootGroup().countSubgroups(); i++)
+        {
+            ContactGroupYahooImpl gr =
+                (ContactGroupYahooImpl)getRootGroup().getGroup(i);
+
+            if(!gr.isPersistent())
+                return gr;
+        }
+
+        return null;
+    }
+    
+    /**
+     * Returns the first persistent group
+     *
+     * @return ContactGroupIcqImpl
+     */
+    private ContactGroupYahooImpl getFirstPersistentGroup()
+    {
+        for (int i = 0; i < getRootGroup().countSubgroups(); i++)
+        {
+            ContactGroupYahooImpl gr =
+                (ContactGroupYahooImpl)getRootGroup().getGroup(i);
+
+            if(gr.isPersistent())
+                return gr;
+        }
+
+        return null;
+    }
+
+    /**
+     * Finds Group by provided its yahoo ID
+     * @param id String
+     * @return ContactGroupYahooImpl
+     */
+    private ContactGroupYahooImpl findContactGroupByYahooId(String id)
+    {
+        Iterator contactGroups = rootGroup.subgroups();
+
+        while(contactGroups.hasNext())
+        {
+            ContactGroupYahooImpl contactGroup
+                = (ContactGroupYahooImpl) contactGroups.next();
+
+            if (contactGroup.getSourceGroup().getName().equals(id))
+                return contactGroup;
+        }
+
+        return null;
+    }
+
+    /**
+     * Make the parent persistent presence operation set dispatch a contact
+     * added event.
+     * @param parentGroup the group where the new contact was added
+     * @param contact the contact that was added
+     */
+    void fireContactAdded( ContactGroup parentGroup,
+                                   ContactYahooImpl contact)
+    {
+        //bail out if no one's listening
+        if(parentOperationSet == null){
+            logger.debug("No presence op. set available. Bailing out.");
+            return;
+        }
+
+        //dispatch
+        parentOperationSet.fireSubscriptionEvent(
+            SubscriptionEvent.SUBSCRIPTION_CREATED, contact, parentGroup);
+    }
+
+    /**
+     * Make the parent persistent presence operation set dispatch a contact
+     * resolved event.
+     * @param parentGroup the group that the resolved contact belongs to.
+     * @param contact the contact that was resolved
+     */
+    void fireContactResolved( ContactGroup parentGroup,
+                                      ContactYahooImpl contact)
+    {
+        //bail out if no one's listening
+        if(parentOperationSet == null){
+            logger.debug("No presence op. set available. Bailing out.");
+            return;
+        }
+
+        //dispatch
+        parentOperationSet.fireSubscriptionEvent(
+            SubscriptionEvent.SUBSCRIPTION_RESOLVED, contact, parentGroup);
+    }
+
+    /**
+     * Returns true if the contact list is initialized and
+     * ready for use, and false otherwise.
+     *
+     * @return true if the contact list is initialized and ready for use and false
+     * otherwise
+     */
+    boolean isInitialized()
+    {
+        return isInitialized;
+    }
+
+    /**
+     * When the protocol is online this method is used to fill or resolve
+     * the current contact list
+     */
+    private void initList()
+    {
+        logger.trace("Start init list of " + yahooProvider.getAccountID().getUserID());
+        
+        YahooGroup[] groups = yahooSession.getGroups();
+        
+        for (int i = 0; i < groups.length; i++)
+        {
+            YahooGroup item = groups[i];
+            
+            ContactGroupYahooImpl group = findContactGroup(item.getName());
+            
+            if(group == null)
+            {
+                // create the group as it doesn't exist
+                group =
+                    new ContactGroupYahooImpl(item, item.getMembers(), this, true);
+
+                rootGroup.addSubGroup(group);
+
+                //tell listeners about the added group
+                fireGroupEvent(group, ServerStoredGroupEvent.GROUP_CREATED_EVENT);
+            }
+            else
+            {
+                // the group exist so just resolved. The group will check and
+                // create or resolve its entries
+                group.setResolved(item);
+
+                //fire an event saying that the group has been resolved
+                fireGroupEvent(group
+                               , ServerStoredGroupEvent.GROUP_RESOLVED_EVENT);
+
+                /** @todo  if something to delete . delete it */
+            }
+            
+            logger.trace("Init of group done! : " + group);
+        }
+    }
+    
+    /**
+     * @param name Name of the group to search
+     * @return The yahoo group with given name
+     */
+    private YahooGroup findGroup(String name)
+    {
+        YahooGroup[] groups = yahooSession.getGroups();
+        for (int i = 0; i < groups.length; i++)
+        {
+            YahooGroup elem = groups[i];
+            if(elem.getName().equals(name))
+                return elem;
+        }
+        return null;
+    }
+
+    /**
+     * Imulates firing adding contact in group and moving contact to group.
+     * When moving contact it is first adding to the new group then
+     * it is removed from the old one.
+     */
+    private class ContactListModListenerImpl
+        extends SessionAdapter
+    {
+        private Hashtable waitMove = new Hashtable();
+        
+        public void waitForMove(String id, String oldParent)
+        {
+            waitMove.put(id, oldParent);
+        }
+        
+        public void removeWaitForMove(String id)
+        {
+            waitMove.remove(id);
+        }
+        
+        /**
+         * Successfully added a friend
+         * friend - YahooUser of friend
+         * group - name of group added to
+         */
+        public void friendAddedReceived(SessionFriendEvent ev)
+        {
+            logger.trace("Receive event for adding a friend : " + ev);
+            
+            ContactGroupYahooImpl group = 
+                findContactGroup(ev.getGroup());
+            
+            if(group == null){
+                logger.trace("Group not found!" + group);
+                return;
+            }
+            
+            // if group is note resolved resolve it
+            // this means newly created group
+            if(!group.isResolved())
+            {
+                YahooGroup gr = findGroup(ev.getGroup());
+                
+                if(gr != null)
+                    group.setResolved(gr);
+                
+                // contact will be added when resolving the group
+                
+                return;
+            }
+            String contactID = ev.getFriend().getId();
+            ContactYahooImpl contactToAdd = findContactById(contactID);
+            
+            if(contactToAdd == null)
+            {
+                contactToAdd =
+                    new ContactYahooImpl(ev.getFriend(), 
+                            ServerStoredContactListYahooImpl.this, true, true);
+            }
+            else
+                if(!contactToAdd.isPersistent())
+                {
+                    // we must remove the volatile buddy as we will add
+                    // the persistent one
+                    ContactGroupYahooImpl parent = 
+                        (ContactGroupYahooImpl)contactToAdd.getParentContactGroup();
+                    parent.removeContact(contactToAdd);
+                    
+                    contactToAdd =
+                        new ContactYahooImpl(ev.getFriend(), 
+                            ServerStoredContactListYahooImpl.this, true, true);
+                }
+            
+            Object isWaitingForMove = waitMove.get(contactID);
+            
+            if(isWaitingForMove != null && isWaitingForMove instanceof String)
+            {
+                // waits for move into group
+                // will remove it from old group and will wait for event remove 
+                // from group, then will fire moved to group event
+                String oldParent = (String)isWaitingForMove;
+                
+                group.addContact(contactToAdd);
+                waitMove.put(contactID, group.getSourceGroup());
+                try
+                {
+                    yahooSession.removeFriend(contactID, oldParent);
+                }
+                catch(IOException ex)
+                {
+                    logger.info("Cannot Remove(till moving) contact :" + 
+                        contactToAdd + " from group " + oldParent);
+                }
+            }
+            else
+            {
+                group.addContact(contactToAdd);
+                fireContactAdded(group, contactToAdd);
+            }
+        }
+
+        /**
+         * Successfully removed a friend
+         * friend - YahooUser of friend
+         * group - name of group removed from
+         */
+        public void friendRemovedReceived(SessionFriendEvent ev)
+        {
+            String contactID = ev.getFriend().getId();
+            
+            // first check is this part of move action
+            Object waitForMoveObj = waitMove.get(contactID);
+            if(waitForMoveObj != null && waitForMoveObj instanceof YahooGroup)
+            {
+                // first get the group - oldParent
+                ContactGroupYahooImpl oldParent = findContactGroup(ev.getGroup());
+                ContactYahooImpl contactToRemove = oldParent.findContact(contactID);
+                
+                oldParent.removeContact(contactToRemove);
+                waitMove.remove(contactID);
+                
+                ContactGroupYahooImpl newParent = 
+                    findContactGroup(((YahooGroup)waitForMoveObj).getName());
+                
+                fireContactMoved(oldParent, newParent, contactToRemove);
+                return;
+            }
+            
+            ContactYahooImpl contactToRemove = findContactById(contactID);
+            
+            ContactGroupYahooImpl parentGroup =
+                    (ContactGroupYahooImpl)contactToRemove.getParentContactGroup();
+            parentGroup.removeContact(contactToRemove);
+            fireContactRemoved(parentGroup, contactToRemove);
+            
+            // check if the group is deleted. If the contact is the last one in
+            // the group. The group is also deleted
+            if(findGroup(ev.getGroup()) == null)
+            {
+                rootGroup.removeSubGroup(parentGroup);
+                fireGroupEvent(parentGroup, ServerStoredGroupEvent.GROUP_REMOVED_EVENT);
+            }
+        }
+        
+        /**
+         * Someone wants to add us to their friends list
+         * to - the target (us!)
+         * from - the user who wants to add us
+         * message - the request message text
+         */
+        public void contactRequestReceived(SessionEvent ev)
+        {
+            logger.info("contactRequestReceived : " + ev);
+            
+            if(handler == null || ev.getFrom() == null)
+                return;
+            
+            ContactYahooImpl contact = findContactById(ev.getFrom());
+            
+            if(contact == null)
+                contact = parentOperationSet.createVolatileContact(ev.getFrom());
+            
+            AuthorizationRequest request = new AuthorizationRequest();
+            request.setReason(ev.getMessage());
+            
+            AuthorizationResponse resp = 
+                handler.processAuthorisationRequest(request, contact);
+            
+            if (resp.getResponseCode() == AuthorizationResponse.REJECT)
+            {
+                try{
+                    yahooSession.rejectContact(ev, resp.getReason());
+                }catch(IOException ex){
+                    logger.error("Cannot send reject : " + ex.getMessage());
+                }
+            }
+        }
+
+        /**
+         * Someone has rejected our attempts to add them to our friends list
+         * from - the user who rejected us
+         * message - rejection message text
+         */
+        public void contactRejectionReceived(SessionEvent ev)
+        {
+            logger.info("contactRejectionReceived : " + ev);
+
+            if(handler == null)
+                return;
+            
+            ContactYahooImpl contact = findContactById(ev.getFrom());
+            
+            AuthorizationResponse resp = 
+                new AuthorizationResponse(AuthorizationResponse.REJECT, ev.getMessage());
+            handler.processAuthorizationResponse(resp, contact);
+        }
+    }
+
+    /**
+     * Sets the yahoo session instance of the lib
+     * which comunicates with the server
+     * @param session YahooSession
+     */
+    void setYahooSession(YahooSession session)
+    {
+        this.yahooSession = session;
+        session.addSessionListener(contactListModListenerImpl);
+        initList();
+    }
+}
\ No newline at end of file
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/VolatileContactGroupYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/VolatileContactGroupYahooImpl.java
new file mode 100644
index 0000000..a5d0e5a
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/VolatileContactGroupYahooImpl.java
@@ -0,0 +1,79 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.util.*;
+
+/**
+ * The Yahoo implementation of the Volatile ContactGroup interface.
+ *
+ * @author Damian Minkov
+ */
+public class VolatileContactGroupYahooImpl
+    extends ContactGroupYahooImpl
+{
+    /**
+     * This contact group name
+     */
+    private String contactGroupName = null;
+
+    /**
+     * Creates an Yahoo group using the specified group name
+     * @param groupName String groupname
+     * @param ssclCallback a callback to the server stored contact list
+     * we're creating.
+     */
+    VolatileContactGroupYahooImpl(
+                        String groupName,
+                        ServerStoredContactListYahooImpl ssclCallback)
+    {
+        super(groupName, ssclCallback);
+        this.contactGroupName = groupName;
+    }
+
+    /**
+     * Returns the name of this group.
+     * @return a String containing the name of this group.
+     */
+    public String getGroupName()
+    {
+        return contactGroupName;
+    }
+
+    /**
+     * Returns a string representation of this group, in the form
+     * YahooGroup.GroupName[size]{ buddy1.toString(), buddy2.toString(), ...}.
+     * @return  a String representation of the object.
+     */
+    public String toString()
+    {
+        StringBuffer buff = new StringBuffer("VolatileYahooGroup.");
+        buff.append(getGroupName());
+        buff.append(", childContacts="+countContacts()+":[");
+
+        Iterator contacts = contacts();
+        while (contacts.hasNext())
+        {
+            ContactYahooImpl contact = (ContactYahooImpl) contacts.next();
+            buff.append(contact.toString());
+            if(contacts.hasNext())
+                buff.append(", ");
+        }
+        return buff.append("]").toString();
+    }
+
+    /**
+     * Determines whether or not this contact group is being stored by the
+     * server. Non persistent contact groups exist for the sole purpose of
+     * containing non persistent contacts.
+     * @return true if the contact group is persistent and false otherwise.
+     */
+    public boolean isPersistent()
+    {
+        return false;
+    }
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/VolatileContactYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/VolatileContactYahooImpl.java
new file mode 100644
index 0000000..285f6e5
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/VolatileContactYahooImpl.java
@@ -0,0 +1,81 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import net.java.sip.communicator.util.Logger;
+
+/**
+ * The Yahoo implementation for Volatile Contact
+ * @author Damian Minkov
+ */
+public class VolatileContactYahooImpl
+    extends ContactYahooImpl
+{
+    /**
+     * This contact id
+     */
+    private String contactId = null;
+    /**
+     * Creates an Volatile YahooContactImpl with the specified id
+     * @param id String the user id/address
+     * @param ssclCallback a reference to the ServerStoredContactListImpl
+     * instance that created us.
+     */
+    VolatileContactYahooImpl(String id,
+                              ServerStoredContactListYahooImpl ssclCallback)
+    {
+        super(id, ssclCallback, false);
+        this.contactId = id;
+    }
+
+    /**
+     * Returns the Yahoo Userid of this contact
+     * @return the Yahoo Userid of this contact
+     */
+    public String getAddress()
+    {
+        return contactId;
+    }
+
+    /**
+     * Returns a String that could be used by any user interacting modules for
+     * referring to this contact. An alias is not necessarily unique but is
+     * often more human readable than an address (or id).
+     * @return a String that can be used for referring to this contact when
+     * interacting with the user.
+     */
+    public String getDisplayName()
+    {
+        return contactId;
+    }
+
+    /**
+     * Returns a string representation of this contact, containing most of its
+     * representative details.
+     *
+     * @return  a string representation of this contact.
+     */
+    public String toString()
+    {
+        StringBuffer buff =  new StringBuffer("VolatileYahooContact[ id=");
+        buff.append(getAddress()).append("]");
+
+        return buff.toString();
+    }
+
+    /**
+     * Determines whether or not this contact group is being stored by the
+     * server. Non persistent contact groups exist for the sole purpose of
+     * containing non persistent contacts.
+     * @return true if the contact group is persistent and false otherwise.
+     */
+    public boolean isPersistent()
+    {
+        return false;
+    }
+
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/YahooAccountID.java b/src/net/java/sip/communicator/impl/protocol/yahoo/YahooAccountID.java
new file mode 100644
index 0000000..5662fd5
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/YahooAccountID.java
@@ -0,0 +1,30 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.util.*;
+
+import net.java.sip.communicator.service.protocol.*;
+
+/**
+ * The Yahoo implementation of a sip-communicator AccountID
+ *
+ * @author Damian Minkov
+ */
+public class YahooAccountID
+    extends AccountID
+{
+    /**
+     * Creates an account id from the specified id and account properties.
+     * @param id the id identifying this account
+     * @param accountProperties any other properties necessary for the account.
+     */
+    YahooAccountID(String id, Map accountProperties )
+    {
+        super(id, accountProperties, ProtocolNames.YAHOO, "yahoo.com");
+    }
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/YahooActivator.java b/src/net/java/sip/communicator/impl/protocol/yahoo/YahooActivator.java
new file mode 100644
index 0000000..2874504
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/YahooActivator.java
@@ -0,0 +1,115 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.util.*;
+
+import org.osgi.framework.*;
+import net.java.sip.communicator.service.configuration.*;
+import net.java.sip.communicator.service.protocol.*;
+
+/**
+ * Loads the Yahoo provider factory and registers it with  service in the OSGI
+ * bundle context.
+ *
+ * @author Damian Minkov
+ */
+public class YahooActivator
+    implements BundleActivator
+{
+    private        ServiceRegistration  yahooPpFactoryServReg   = null;
+    private static BundleContext        bundleContext         = null;
+    private static ConfigurationService configurationService  = null;
+
+    private static ProtocolProviderFactoryYahooImpl yahooProviderFactory = null;
+
+    /**
+     * Called when this bundle is started so the Framework can perform the
+     * bundle-specific activities necessary to start this bundle.
+     *
+     * @param context The execution context of the bundle being started.
+     * @throws Exception If this method throws an exception, this bundle is
+     *   marked as stopped and the Framework will remove this bundle's
+     *   listeners, unregister all services registered by this bundle, and
+     *   release all services used by this bundle.
+     */
+    public void start(BundleContext context) throws Exception
+    {
+        this.bundleContext = context;
+        Hashtable hashtable = new Hashtable();
+        hashtable.put(ProtocolProviderFactory.PROTOCOL, ProtocolNames.YAHOO);
+
+        yahooProviderFactory = new ProtocolProviderFactoryYahooImpl();
+
+        //load all yahoo providers
+        yahooProviderFactory.loadStoredAccounts();
+
+        //reg the yahoo account man.
+        yahooPpFactoryServReg =  context.registerService(
+                    ProtocolProviderFactory.class.getName(),
+                    yahooProviderFactory,
+                    hashtable);
+    }
+
+    /**
+     * Returns a reference to a ConfigurationService implementation currently
+     * registered in the bundle context or null if no such implementation was
+     * found.
+     *
+     * @return ConfigurationService a currently valid implementation of the
+     * configuration service.
+     */
+    public static ConfigurationService getConfigurationService()
+    {
+        if(configurationService == null)
+        {
+            ServiceReference confReference
+                = bundleContext.getServiceReference(
+                    ConfigurationService.class.getName());
+            configurationService
+                = (ConfigurationService) bundleContext.getService(confReference);
+        }
+        return configurationService;
+    }
+
+    /**
+     * Returns a reference to the bundle context that we were started with.
+     * @return a reference to the BundleContext instance that we were started
+     * witn.
+     */
+    public static BundleContext getBundleContext()
+    {
+        return bundleContext;
+    }
+
+    /**
+     * Retrurns a reference to the protocol provider factory that we have
+     * registered.
+     * @return a reference to the <tt>ProtocolProviderFactoryYahooImpl</tt>
+     * instance that we have registered from this package.
+     */
+    static ProtocolProviderFactoryYahooImpl getProtocolProviderFactory()
+    {
+        return yahooProviderFactory;
+    }
+
+    /**
+     * Called when this bundle is stopped so the Framework can perform the
+     * bundle-specific activities necessary to stop the bundle.
+     *
+     * @param context The execution context of the bundle being stopped.
+     * @throws Exception If this method throws an exception, the bundle is
+     *   still marked as stopped, and the Framework will remove the bundle's
+     *   listeners, unregister all services registered by the bundle, and
+     *   release all services used by the bundle.
+     */
+    public void stop(BundleContext context) throws Exception
+    {
+        yahooProviderFactory.stop();
+        yahooPpFactoryServReg.unregister();
+    }
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/YahooSession.java b/src/net/java/sip/communicator/impl/protocol/yahoo/YahooSession.java
new file mode 100644
index 0000000..be04d71
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/YahooSession.java
@@ -0,0 +1,28 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.impl.protocol.yahoo;
+
+import java.io.*;
+import ymsg.network.*;
+
+/**
+ * Extends The Yahoo session to have access to some 
+ * protected functionality
+ * Not working for now.
+ * 
+ * @author Damian Minkov
+ */
+public class YahooSession
+    extends Session
+{
+    
+    public void renameGroup(String oldName, String newName) 
+        throws IOException    
+    {
+        transmitGroupRename(oldName, newName);
+    }
+}
diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/yahoo.provider.manifest.mf b/src/net/java/sip/communicator/impl/protocol/yahoo/yahoo.provider.manifest.mf
new file mode 100644
index 0000000..523e8d4
--- /dev/null
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/yahoo.provider.manifest.mf
@@ -0,0 +1,19 @@
+Bundle-Activator: net.java.sip.communicator.impl.protocol.yahoo.YahooActivator
+Bundle-Name: Yahoo Protocol Provider Implementation
+Bundle-Description: An Yahoo implementation of the Protocol Provider Service.
+Bundle-Vendor: sip-communicator.org
+Bundle-Version: 0.0.1
+Import-Package: org.osgi.framework,
+ javax.net.ssl,
+ javax.swing,
+ javax.xml.parsers,
+ javax.naming,
+ javax.naming.directory,
+ org.xml.sax,
+ sun.security.action,
+ net.java.sip.communicator.service.configuration,
+ net.java.sip.communicator.util,
+ net.java.sip.communicator.service.configuration.event,
+ net.java.sip.communicator.service.protocol,
+ net.java.sip.communicator.service.protocol.yahooconstants,
+ net.java.sip.communicator.service.protocol.event
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/FirstWizardPage.java b/src/net/java/sip/communicator/plugin/yahooaccregwizz/FirstWizardPage.java
new file mode 100644
index 0000000..007a26f
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/FirstWizardPage.java
@@ -0,0 +1,262 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.plugin.yahooaccregwizz;
+
+import java.awt.*;
+import java.util.*;
+
+import javax.swing.*;
+import javax.swing.event.*;
+
+import net.java.sip.communicator.service.gui.*;
+import net.java.sip.communicator.service.protocol.*;
+
+/**
+ * The <tt>FirstWizardPage</tt> is the page, where user could enter the uin
+ * and the password of the account.
+ *
+ * @author Yana Stamcheva
+ * @author Damian Minkov
+ */
+public class FirstWizardPage extends JPanel
+    implements WizardPage, DocumentListener {
+
+    public static final String FIRST_PAGE_IDENTIFIER = "FirstPageIdentifier";
+
+    private JPanel uinPassPanel = new JPanel(new BorderLayout(10, 10));
+
+    private JPanel labelsPanel = new JPanel();
+
+    private JPanel valuesPanel = new JPanel();
+
+    private JLabel uinLabel = new JLabel(Resources.getString("uin"));
+
+    private JLabel passLabel = new JLabel(Resources.getString("password"));
+
+    private JLabel existingAccountLabel
+        = new JLabel(Resources.getString("existingAccount"));
+    
+    private JPanel emptyPanel = new JPanel();
+    
+    private JLabel uinExampleLabel = new JLabel("Ex: johnsmith@hotmail.com");
+    
+    private JTextField uinField = new JTextField();
+
+    private JPasswordField passField = new JPasswordField();
+
+    private JCheckBox rememberPassBox = new JCheckBox(
+            Resources.getString("rememberPassword"));
+
+    private JPanel mainPanel = new JPanel();
+    
+    private Object nextPageIdentifier = WizardPage.SUMMARY_PAGE_IDENTIFIER;
+
+    private YahooAccountRegistration registration;
+
+    private WizardContainer wizardContainer;
+
+    /**
+     * Creates an instance of <tt>FirstWizardPage</tt>.
+     * @param registration the <tt>YahooAccountRegistration</tt>, where
+     * all data through the wizard are stored
+     * @param wizardContainer the wizardContainer, where this page will
+     * be added
+     */
+    public FirstWizardPage(YahooAccountRegistration registration,
+            WizardContainer wizardContainer) {
+
+        super(new BorderLayout());
+
+        this.wizardContainer = wizardContainer;
+
+        this.registration = registration;
+
+        this.setPreferredSize(new Dimension(300, 150));
+
+        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
+
+        this.init();
+
+        this.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
+        
+        this.labelsPanel.setLayout(new BoxLayout(labelsPanel, BoxLayout.Y_AXIS));
+        
+        this.valuesPanel.setLayout(new BoxLayout(valuesPanel, BoxLayout.Y_AXIS));
+    }
+
+    /**
+     * Initializes all panels, buttons, etc.
+     */
+    private void init() {
+        this.uinField.getDocument().addDocumentListener(this);
+        this.rememberPassBox.setSelected(true);
+
+        this.existingAccountLabel.setForeground(Color.RED);
+        
+        this.uinExampleLabel.setForeground(Color.GRAY);
+        this.uinExampleLabel.setFont(uinExampleLabel.getFont().deriveFont(8));
+        this.emptyPanel.setMaximumSize(new Dimension(40, 35));
+        this.uinExampleLabel.setBorder(BorderFactory.createEmptyBorder(0, 0, 8, 0));
+        
+        labelsPanel.add(uinLabel);
+        labelsPanel.add(emptyPanel);
+        labelsPanel.add(passLabel);
+
+        valuesPanel.add(uinField);
+        valuesPanel.add(uinExampleLabel);
+        valuesPanel.add(passField);
+
+        uinPassPanel.add(labelsPanel, BorderLayout.WEST);
+        uinPassPanel.add(valuesPanel, BorderLayout.CENTER);
+        uinPassPanel.add(rememberPassBox, BorderLayout.SOUTH);
+
+        uinPassPanel.setBorder(BorderFactory
+                .createTitledBorder(Resources.getString("uinAndPassword")));
+
+        mainPanel.add(uinPassPanel);
+        this.add(mainPanel, BorderLayout.NORTH);
+    }
+
+    /**
+     * Implements the <code>WizardPage.getIdentifier</code> to return
+     * this page identifier.
+     */
+    public Object getIdentifier() {
+        return FIRST_PAGE_IDENTIFIER;
+    }
+
+    /**
+     * Implements the <code>WizardPage.getNextPageIdentifier</code> to return
+     * the next page identifier - the summary page.
+     */
+    public Object getNextPageIdentifier() {
+        return nextPageIdentifier;
+    }
+
+    /**
+     * Implements the <code>WizardPage.getBackPageIdentifier</code> to return
+     * the next back identifier - the default page.
+     */
+    public Object getBackPageIdentifier() {
+        return WizardPage.DEFAULT_PAGE_IDENTIFIER;
+    }
+
+    /**
+     * Implements the <code>WizardPage.getWizardForm</code> to return
+     * this panel.
+     */
+    public Object getWizardForm() {
+        return this;
+    }
+
+    /**
+     * Before this page is displayed enables or disables the "Next" wizard
+     * button according to whether the UIN field is empty.
+     */
+    public void pageShowing() {
+        this.setNextButtonAccordingToUIN();
+    }
+
+    /**
+     * Saves the user input when the "Next" wizard buttons is clicked.
+     */
+    public void pageNext() {
+        String uin = uinField.getText();
+        
+        if(isExistingAccount(uin)) {
+            nextPageIdentifier = FIRST_PAGE_IDENTIFIER;
+            uinPassPanel.add(existingAccountLabel, BorderLayout.NORTH);
+            this.revalidate();
+        }
+        else {
+            nextPageIdentifier = SUMMARY_PAGE_IDENTIFIER;
+            uinPassPanel.remove(existingAccountLabel);
+            
+            registration.setUin(uinField.getText());
+            registration.setPassword(new String(passField.getPassword()));
+            registration.setRememberPassword(rememberPassBox.isSelected());
+        }
+    }
+
+    /**
+     * Enables or disables the "Next" wizard button according to whether the
+     * UIN field is empty.
+     */
+    private void setNextButtonAccordingToUIN() {
+        if (uinField.getText() == null || uinField.getText().equals("")) {
+            wizardContainer.setNextFinishButtonEnabled(false);
+        }
+        else {
+            wizardContainer.setNextFinishButtonEnabled(true);
+        }
+    }
+
+    /**
+     * Handles the <tt>DocumentEvent</tt> triggered when user types in the
+     * UIN field. Enables or disables the "Next" wizard button according to
+     * whether the UIN field is empty.
+     */
+    public void insertUpdate(DocumentEvent e) {
+        this.setNextButtonAccordingToUIN();
+    }
+
+    /**
+     * Handles the <tt>DocumentEvent</tt> triggered when user deletes letters
+     * from the UIN field. Enables or disables the "Next" wizard button
+     * according to whether the UIN field is empty.
+     */
+    public void removeUpdate(DocumentEvent e) {
+        this.setNextButtonAccordingToUIN();
+    }
+
+    public void changedUpdate(DocumentEvent e) {
+    }
+
+    public void pageHiding() {
+    }
+
+    public void pageShown() {
+    }
+
+    public void pageBack() {
+    }
+
+    /**
+     * Fills the UIN and Password fields in this panel with the data comming
+     * from the given protocolProvider.
+     * @param protocolProvider The <tt>ProtocolProviderService</tt> to load the
+     * data from.
+     */
+    public void loadAccount(ProtocolProviderService protocolProvider) {
+        AccountID accountID = protocolProvider.getAccountID();
+        String password = (String)accountID.getAccountProperties()
+            .get(ProtocolProviderFactory.PASSWORD);
+
+        this.uinField.setText(accountID.getUserID());
+
+        if(password != null) {
+            this.passField.setText(password);
+            this.rememberPassBox.setSelected(true);
+        }
+    }
+    
+    private boolean isExistingAccount(String accountName)
+    {   
+        ProtocolProviderFactory factory 
+            = YahooAccRegWizzActivator.getYahooProtocolProviderFactory();
+        
+        ArrayList registeredAccounts = factory.getRegisteredAccounts();
+        
+        for(int i = 0; i < registeredAccounts.size(); i ++) {
+            AccountID accountID = (AccountID) registeredAccounts.get(i);
+            
+            if(accountName.equalsIgnoreCase(accountID.getUserID()))
+                return true;
+        }
+        return false;
+    }
+}
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/Resources.java b/src/net/java/sip/communicator/plugin/yahooaccregwizz/Resources.java
new file mode 100644
index 0000000..96001e6
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/Resources.java
@@ -0,0 +1,81 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+
+package net.java.sip.communicator.plugin.yahooaccregwizz;
+
+import java.io.*;
+import java.util.*;
+
+import net.java.sip.communicator.util.*;
+/**
+ * The Messages class manages the access to the internationalization
+ * properties files.
+ * @author Yana Stamcheva
+ */
+public class Resources {
+
+    private static Logger log = Logger.getLogger(Resources.class);
+
+    private static final String BUNDLE_NAME
+        = "net.java.sip.communicator.plugin.yahooaccregwizz.resources";
+
+    private static final ResourceBundle RESOURCE_BUNDLE = ResourceBundle
+            .getBundle(BUNDLE_NAME);
+
+    public static ImageID YAHOO_LOGO = new ImageID("protocolIcon");
+
+    /**
+     * Returns an internationalized string corresponding to the given key.
+     * @param key The key of the string.
+     * @return An internationalized string corresponding to the given key.
+     */
+    public static String getString(String key) {
+        try {
+            return RESOURCE_BUNDLE.getString(key);
+
+        } catch (MissingResourceException e) {
+
+            return '!' + key + '!';
+        }
+    }
+
+    /**
+     * Loads an image from a given image identifier.
+     * @param imageID The identifier of the image.
+     * @return The image for the given identifier.
+     */
+    public static byte[] getImage(ImageID imageID) {
+        byte[] image = new byte[100000];
+
+        String path = Resources.getString(imageID.getId());
+        try {
+            Resources.class.getClassLoader()
+                    .getResourceAsStream(path).read(image);
+
+        } catch (IOException e) {
+            log.error("Failed to load image:" + path, e);
+        }
+
+        return image;
+    }
+
+    /**
+     * Represents the Image Identifier.
+     */
+    public static class ImageID {
+        private String id;
+
+        private ImageID(String id) {
+            this.id = id;
+        }
+
+        public String getId() {
+            return id;
+        }
+    }
+
+}
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/SecondWizardPage.java b/src/net/java/sip/communicator/plugin/yahooaccregwizz/SecondWizardPage.java
new file mode 100644
index 0000000..c5c537a
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/SecondWizardPage.java
@@ -0,0 +1,48 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.plugin.yahooaccregwizz;
+
+import javax.swing.*;
+
+import net.java.sip.communicator.service.gui.*;
+
+public class SecondWizardPage extends JPanel
+    implements WizardPage {
+
+    public static final String SECOND_PAGE_IDENTIFIER = "SecondPageIdentifier";
+
+    public Object getIdentifier() {
+        return SECOND_PAGE_IDENTIFIER;
+    }
+
+    public Object getNextPageIdentifier() {
+        return FINISH_PAGE_IDENTIFIER;
+    }
+
+    public Object getBackPageIdentifier() {
+        return FirstWizardPage.FIRST_PAGE_IDENTIFIER;
+    }
+
+    public Object getWizardForm() {
+        return this;
+    }
+
+    public void pageHiding() {
+    }
+
+    public void pageShown() {
+    }
+
+    public void pageShowing() {
+    }
+
+    public void pageNext() {
+    }
+
+    public void pageBack() {
+    }
+}
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccRegWizzActivator.java b/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccRegWizzActivator.java
new file mode 100644
index 0000000..fe35f38
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccRegWizzActivator.java
@@ -0,0 +1,78 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.plugin.yahooaccregwizz;
+
+import org.osgi.framework.*;
+import net.java.sip.communicator.service.configuration.*;
+import net.java.sip.communicator.service.gui.*;
+import net.java.sip.communicator.service.protocol.*;
+import net.java.sip.communicator.util.*;
+
+/**
+ * Registers the <tt>YahooAccountRegistrationWizard</tt> in the UI Service.
+ *
+ * @author Yana Stamcheva
+ */
+public class YahooAccRegWizzActivator implements BundleActivator {
+
+    public static BundleContext bundleContext;
+
+    private static Logger logger = Logger.getLogger(
+            YahooAccRegWizzActivator.class.getName());
+
+    private static ConfigurationService configService;
+
+    /**
+     * Starts this bundle.
+     * @param bc BundleContext
+     * @throws Exception
+     */
+    public void start(BundleContext bc) throws Exception {
+
+        bundleContext = bc;
+
+        ServiceReference uiServiceRef = bundleContext
+            .getServiceReference(UIService.class.getName());
+
+        UIService uiService
+            = (UIService) bundleContext.getService(uiServiceRef);
+
+        AccountRegistrationWizardContainer wizardContainer
+            = uiService.getAccountRegWizardContainer();
+
+        YahooAccountRegistrationWizard yahooWizard
+            = new YahooAccountRegistrationWizard(wizardContainer);
+
+        wizardContainer.addAccountRegistrationWizard(yahooWizard);
+    }
+
+    public void stop(BundleContext bundleContext) throws Exception {
+    }
+
+    /**
+     * Returns the <tt>ProtocolProviderFactory</tt> for the Yahoo protocol.
+     * @return the <tt>ProtocolProviderFactory</tt> for the Yahoo protocol
+     */
+    public static ProtocolProviderFactory getYahooProtocolProviderFactory() {
+
+        ServiceReference[] serRefs = null;
+
+        String osgiFilter = "("
+            + ProtocolProviderFactory.PROTOCOL
+            + "="+ProtocolNames.YAHOO+")";
+
+        try {
+            serRefs = bundleContext.getServiceReferences(
+                ProtocolProviderFactory.class.getName(), osgiFilter);
+        }
+        catch (InvalidSyntaxException ex){
+            logger.error("YahooAccRegWizzActivator : " + ex);
+        }
+
+        return (ProtocolProviderFactory) bundleContext.getService(serRefs[0]);
+    }
+}
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccountRegistration.java b/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccountRegistration.java
new file mode 100644
index 0000000..a93e3b5
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccountRegistration.java
@@ -0,0 +1,72 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.plugin.yahooaccregwizz;
+
+/**
+ * The <tt>YahooAccountRegistration</tt> is used to store all user input data
+ * through the <tt>YahooAccountRegistrationWizard</tt>.
+ *
+ * @author Yana Stamcheva
+ */
+public class YahooAccountRegistration {
+
+    private String uin;
+
+    private String password;
+
+    private boolean rememberPassword;
+
+    /**
+     * Returns the password of the yahoo registration account.
+     * @return the password of the yahoo registration account.
+     */
+    public String getPassword() {
+        return password;
+    }
+
+    /**
+     * Sets the password of the yahoo registration account.
+     * @param password the password of the yahoo registration account.
+     */
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    /**
+     * Returns TRUE if password has to remembered, FALSE otherwise.
+     * @return TRUE if password has to remembered, FALSE otherwise
+     */
+    public boolean isRememberPassword() {
+        return rememberPassword;
+    }
+
+    /**
+     * Sets the rememberPassword value of this yahoo account registration.
+     * @param rememberPassword TRUE if password has to remembered, FALSE
+     * otherwise
+     */
+    public void setRememberPassword(boolean rememberPassword) {
+        this.rememberPassword = rememberPassword;
+    }
+
+    /**
+     * Returns the UIN of the yahoo registration account.
+     * @return the UIN of the yahoo registration account.
+     */
+    public String getUin() {
+        return uin;
+    }
+
+    /**
+     * Sets the UIN of the yahoo registration account.
+     * @param uin the UIN of the yahoo registration account.
+     */
+    public void setUin(String uin) {
+        this.uin = uin;
+    }
+
+}
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccountRegistrationWizard.java b/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccountRegistrationWizard.java
new file mode 100644
index 0000000..45bff02
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/YahooAccountRegistrationWizard.java
@@ -0,0 +1,177 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.plugin.yahooaccregwizz;
+
+import java.util.*;
+
+import javax.swing.*;
+
+import org.osgi.framework.*;
+
+import net.java.sip.communicator.impl.gui.customcontrols.*;
+import net.java.sip.communicator.service.configuration.*;
+import net.java.sip.communicator.service.gui.*;
+import net.java.sip.communicator.service.protocol.*;
+
+/**
+ * The <tt>YahooAccountRegistrationWizard</tt> is an implementation of the
+ * <tt>AccountRegistrationWizard</tt> for the Yahoo protocol. It should allow
+ * the user to create and configure a new Yahoo account.
+ *
+ * @author Yana Stamcheva
+ */
+public class YahooAccountRegistrationWizard implements AccountRegistrationWizard {
+
+    private FirstWizardPage firstWizardPage;
+
+    private YahooAccountRegistration registration
+        = new YahooAccountRegistration();
+
+    private WizardContainer wizardContainer;
+
+    private ProtocolProviderService protocolProvider;
+
+    private String propertiesPackage = "net.java.sip.communicator.plugin.yahooaccregwizz";
+    
+    private boolean isModification;
+
+    /**
+     * Creates an instance of <tt>YahooAccountRegistrationWizard</tt>.
+     * @param wizardContainer the wizard container, where this wizard
+     * is added
+     */
+    public YahooAccountRegistrationWizard(WizardContainer wizardContainer) {
+        this.wizardContainer = wizardContainer;
+    }
+
+    /**
+     * Implements the <code>AccountRegistrationWizard.getIcon</code> method.
+     * Returns the icon to be used for this wizard.
+     * @return byte[]
+     */
+    public byte[] getIcon() {
+        return Resources.getImage(Resources.YAHOO_LOGO);
+    }
+
+    /**
+     * Implements the <code>AccountRegistrationWizard.getProtocolName</code>
+     * method. Returns the protocol name for this wizard.
+     * @return String
+     */
+    public String getProtocolName() {
+        return Resources.getString("protocolName");
+    }
+
+    /**
+     * Implements the <code>AccountRegistrationWizard.getProtocolDescription
+     * </code> method. Returns the description of the protocol for this wizard.
+     * @return String
+     */
+    public String getProtocolDescription() {
+        return Resources.getString("protocolDescription");
+    }
+
+    /**
+     * Returns the set of pages contained in this wizard.
+     * @return Iterator
+     */
+    public Iterator getPages() {
+        ArrayList pages = new ArrayList();
+        firstWizardPage = new FirstWizardPage(registration, wizardContainer);
+
+        pages.add(firstWizardPage);
+
+        return pages.iterator();
+    }
+
+    /**
+     * Returns the set of data that user has entered through this wizard.
+     * @return Iterator
+     */
+    public Iterator getSummary() {
+        Hashtable summaryTable = new Hashtable();
+
+        summaryTable.put("UIN", registration.getUin());
+        summaryTable.put("Remember password",
+                new Boolean(registration.isRememberPassword()));
+
+        return summaryTable.entrySet().iterator();
+    }
+
+    /**
+     * Installs the account created through this wizard.
+     * @return ProtocolProviderService
+     */
+    public ProtocolProviderService finish() {
+        firstWizardPage = null;
+        ProtocolProviderFactory factory
+            = YahooAccRegWizzActivator.getYahooProtocolProviderFactory();
+
+        return this.installAccount(factory,
+                registration.getUin(), registration.getPassword());
+    }
+
+    /**
+     * Creates an account for the given user and password.
+     * @param providerFactory the ProtocolProviderFactory which will create
+     * the account
+     * @param user the user identifier
+     * @param passwd the password
+     * @return the <tt>ProtocolProviderService</tt> for the new account.
+     */
+    public ProtocolProviderService installAccount(
+            ProtocolProviderFactory providerFactory,
+            String user,
+            String passwd) {
+
+        Hashtable accountProperties = new Hashtable();
+
+        if(registration.isRememberPassword()) {
+            accountProperties.put(ProtocolProviderFactory.PASSWORD, passwd);
+        }
+
+        if(isModification) {
+            providerFactory.uninstallAccount(protocolProvider.getAccountID());
+            this.protocolProvider = null;
+        }
+
+        try {
+            AccountID accountID = providerFactory.installAccount(
+                    user, accountProperties);
+
+            ServiceReference serRef = providerFactory
+                .getProviderForAccount(accountID);
+    
+            protocolProvider
+                = (ProtocolProviderService) YahooAccRegWizzActivator.bundleContext
+                    .getService(serRef);
+        }
+        catch (IllegalArgumentException e) {
+            new ErrorDialog(null, e.getMessage()).showDialog();            
+        }
+        catch (IllegalStateException e) {
+            new ErrorDialog(null, e.getMessage()).showDialog();
+        }    
+
+        return protocolProvider;
+    }
+
+    /**
+     * Fills the UIN and Password fields in this panel with the data comming
+     * from the given protocolProvider.
+     * @param protocolProvider The <tt>ProtocolProviderService</tt> to load the
+     * data from.
+     */
+    public void loadAccount(ProtocolProviderService protocolProvider) {
+
+        this.protocolProvider = protocolProvider;
+
+        this.firstWizardPage.loadAccount(protocolProvider);
+        
+        this.isModification = true;
+    }
+}
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/resources.properties b/src/net/java/sip/communicator/plugin/yahooaccregwizz/resources.properties
new file mode 100644
index 0000000..149fdde
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/resources.properties
@@ -0,0 +1,9 @@
+protocolName=YAHOO
+protocolDescription=A protocol to connect and chat on the  Yahoo Service.
+uin=Username:
+password=Password:
+rememberPassword=Remember password
+uinAndPassword=ID and Password
+existingAccount=* The account you entered is already installed.
+
+protocolIcon=net/java/sip/communicator/plugin/yahooaccregwizz/resources/yahoo.png
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/resources/yahoo.png b/src/net/java/sip/communicator/plugin/yahooaccregwizz/resources/yahoo.png
new file mode 100644
index 0000000..feaf973
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/resources/yahoo.png
diff --git a/src/net/java/sip/communicator/plugin/yahooaccregwizz/yahooaccregwizz.manifest.mf b/src/net/java/sip/communicator/plugin/yahooaccregwizz/yahooaccregwizz.manifest.mf
new file mode 100644
index 0000000..787f3e2
--- /dev/null
+++ b/src/net/java/sip/communicator/plugin/yahooaccregwizz/yahooaccregwizz.manifest.mf
@@ -0,0 +1,30 @@
+Bundle-Activator: net.java.sip.communicator.plugin.yahooaccregwizz.YahooAccRegWizzActivator
+Bundle-Name: Yahoo account registration wizard
+Bundle-Description: Yahoo account registration wizard.
+Bundle-Vendor: sip-communicator.org
+Bundle-Version: 0.0.1
+Import-Package: org.osgi.framework,
+ net.java.sip.communicator.util,
+ net.java.sip.communicator.service.configuration,
+ net.java.sip.communicator.service.configuration.event,
+ net.java.sip.communicator.service.protocol,
+ net.java.sip.communicator.service.protocol.icqconstants,
+ net.java.sip.communicator.service.protocol.event,
+ net.java.sip.communicator.service.contactlist,
+ net.java.sip.communicator.service.contactlist.event,
+ net.java.sip.communicator.service.gui,
+ net.java.sip.communicator.service.gui.event,
+ javax.swing,
+ javax.swing.event,
+ javax.swing.table,
+ javax.swing.text,
+ javax.swing.text.html,
+ javax.accessibility,
+ javax.swing.plaf,
+ javax.swing.plaf.metal,
+ javax.swing.plaf.basic,
+ javax.imageio,
+ javax.swing.filechooser,
+ javax.swing.tree,
+ javax.swing.undo,
+ javax.swing.border
diff --git a/src/net/java/sip/communicator/service/protocol/ProtocolNames.java b/src/net/java/sip/communicator/service/protocol/ProtocolNames.java
index 1c76f69..71bddd8 100644
--- a/src/net/java/sip/communicator/service/protocol/ProtocolNames.java
+++ b/src/net/java/sip/communicator/service/protocol/ProtocolNames.java
@@ -54,7 +54,7 @@ public interface ProtocolNames
     /**
      * The Yahoo! messenger protcool.
      */
-    public static final String YAHOO  = "Yahoo!";
+    public static final String YAHOO  = "Yahoo";
 
     /**
      * The Skype protcool.
diff --git a/src/net/java/sip/communicator/service/protocol/protocol.provider.manifest.mf b/src/net/java/sip/communicator/service/protocol/protocol.provider.manifest.mf
index 685c671..0ba2dfe 100644
--- a/src/net/java/sip/communicator/service/protocol/protocol.provider.manifest.mf
+++ b/src/net/java/sip/communicator/service/protocol/protocol.provider.manifest.mf
@@ -10,4 +10,5 @@ Export-Package: net.java.sip.communicator.service.protocol,
  net.java.sip.communicator.service.protocol.icqconstants,
  net.java.sip.communicator.service.protocol.jabberconstants,
  net.java.sip.communicator.service.protocol.msnconstants,
+ net.java.sip.communicator.service.protocol.yahooconstants,
  net.java.sip.communicator.service.protocol.event