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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.java.sip.communicator.plugin.otr;
import java.util.*;
import java.util.concurrent.*;
import net.java.sip.communicator.service.protocol.*;
import net.java.sip.communicator.util.*;
import org.osgi.framework.*;
/**
* The OtrContactManager is used for accessing <tt>OtrContact</tt>s in a static
* way.
*
* The <tt>OtrContact</tt> class is just a wrapper of [Contact, ContactResource]
* pairs. Its purpose is for the otr plugin to be able to create different
* <tt>Session</tt>s for every ContactResource that a Contact has.
*
* Currently, only the Jabber protocol supports ContactResources.
*
* @author Marin Dzhigarov
*
*/
public class OtrContactManager implements ServiceListener
{
/**
* The logger
*/
private final Logger logger = Logger.getLogger(OtrContactManager.class);
/**
* A map that caches OtrContacts to minimize memory usage.
*/
private static final Map<Contact, List<OtrContact>> contactsMap =
new ConcurrentHashMap<Contact, List<OtrContact>>();
/**
* The <tt>OtrContact</tt> class is just a wrapper of
* [Contact, ContactResource] pairs. Its purpose is for the otr plugin to be
* able to create different <tt>Session</tt>s for every ContactResource that
* a Contact has.
*
* @author Marin Dzhigarov
*
*/
public static class OtrContact
{
public final Contact contact;
public final ContactResource resource;
private OtrContact(Contact contact, ContactResource resource)
{
this.contact = contact;
this.resource = resource;
}
public boolean equals(Object obj)
{
if (this == obj)
return true;
if (!(obj instanceof OtrContact))
return false;
OtrContact other = (OtrContact) obj;
if (this.contact != null && this.contact.equals(other.contact))
{
if (this.resource != null && resource.equals(other.resource))
return true;
if (this.resource == null && other.resource == null)
return true;
return false;
}
return false;
}
public int hashCode()
{
int result = 17;
result = 31 * result + (contact == null ? 0 : contact.hashCode());
result = 31 * result + (resource == null ? 0 : resource.hashCode());
return result;
}
}
/**
* Gets the <tt>OtrContact</tt> that represents this
* [Contact, ContactResource] pair from the cache. If such pair does not
* still exist it is then created and cached for further usage.
*
* @param contact the <tt>Contact</tt> that the returned OtrContact
* represents.
* @param resource the <tt>ContactResource</tt> that the returned OtrContact
* represents.
* @return The <tt>OtrContact</tt> that represents this
* [Contact, ContactResource] pair.
*/
public static OtrContact getOtrContact(
Contact contact, ContactResource resource)
{
if (contact == null)
return null;
List<OtrContact> otrContactsList = contactsMap.get(contact);
if (otrContactsList != null)
{
for (OtrContact otrContact : otrContactsList)
{
if (resource != null && resource.equals(otrContact.resource))
return otrContact;
}
OtrContact otrContact = new OtrContact(contact, resource);
synchronized (otrContactsList)
{
while (!otrContactsList.contains(otrContact))
otrContactsList.add(otrContact);
}
return otrContact;
}
else
{
synchronized (contactsMap)
{
while (!contactsMap.containsKey(contact))
{
otrContactsList = new ArrayList<OtrContact>();
contactsMap.put(contact, otrContactsList);
}
}
return getOtrContact(contact, resource);
}
}
/**
* Cleans up unused cached up Contacts.
*/
public void serviceChanged(ServiceEvent event)
{
Object service
= OtrActivator.bundleContext.getService(event.getServiceReference());
if (!(service instanceof ProtocolProviderService))
return;
if (event.getType() == ServiceEvent.UNREGISTERING)
{
if (logger.isDebugEnabled())
{
logger.debug(
"Unregistering a ProtocolProviderService, cleaning"
+ " OTR's Contact to OtrContact map");
}
ProtocolProviderService provider
= (ProtocolProviderService) service;
synchronized(contactsMap)
{
Iterator<Contact> i = contactsMap.keySet().iterator();
while (i.hasNext())
{
if (provider.equals(i.next().getProtocolProvider()))
i.remove();
}
}
}
}
}
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