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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Copyright 2003-2005 Arthur van Hoff Rick Blair
*
* 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.impl.protocol.zeroconf.jmdns;
import java.util.*;
import java.util.logging.*;
/**
* DNSState defines the possible states for services registered with JmDNS.
*
* @author Werner Randelshofer, Rick Blair
* @version 1.0 May 23, 2004 Created.
*/
public class DNSState
implements Comparable<DNSState>
{
private static Logger logger =
Logger.getLogger(DNSState.class.toString());
private final String name;
/**
* Ordinal of next state to be created.
*/
private static int nextOrdinal = 0;
/**
* Assign an ordinal to this state.
*/
private final int ordinal = nextOrdinal++;
/**
* Logical sequence of states.
* The sequence is consistent with the ordinal of a state.
* This is used for advancing through states.
*/
private final static ArrayList<DNSState> sequence
= new ArrayList<DNSState>();
private DNSState(String name)
{
this.name = name;
sequence.add(this);
String SLevel = System.getProperty("jmdns.debug");
if (SLevel == null) SLevel = "INFO";
logger.setLevel(Level.parse(SLevel));
}
@Override
public final String toString()
{
return name;
}
public static final DNSState PROBING_1 = new DNSState("probing 1");
public static final DNSState PROBING_2 = new DNSState("probing 2");
public static final DNSState PROBING_3 = new DNSState("probing 3");
public static final DNSState ANNOUNCING_1 = new DNSState("announcing 1");
public static final DNSState ANNOUNCING_2 = new DNSState("announcing 2");
public static final DNSState ANNOUNCED = new DNSState("announced");
public static final DNSState CANCELED = new DNSState("canceled");
/**
* Returns the next advanced state.
* In general, this advances one step in the following sequence: PROBING_1,
* PROBING_2, PROBING_3, ANNOUNCING_1, ANNOUNCING_2, ANNOUNCED.
* Does not advance for ANNOUNCED and CANCELED state.
* @return Returns the next advanced state.
*/
public final DNSState advance()
{
return (isProbing() || isAnnouncing()) ?
sequence.get(ordinal + 1) :
this;
}
/**
* Returns to the next reverted state.
* All states except CANCELED revert to PROBING_1.
* Status CANCELED does not revert.
* @return Returns to the next reverted state.
*/
public final DNSState revert()
{
return (this == CANCELED) ? this : PROBING_1;
}
/**
* Returns true, if this is a probing state.
* @return Returns true, if this is a probing state.
*/
public boolean isProbing()
{
return compareTo(PROBING_1) >= 0 && compareTo(PROBING_3) <= 0;
}
/**
* Returns true, if this is an announcing state.
* @return Returns true, if this is an announcing state.
*/
public boolean isAnnouncing()
{
return compareTo(ANNOUNCING_1) >= 0 && compareTo(ANNOUNCING_2) <= 0;
}
/**
* Returns true, if this is an announced state.
* @return Returns true, if this is an announced state.
*/
public boolean isAnnounced()
{
return compareTo(ANNOUNCED) == 0;
}
/**
* Compares two states.
* The states compare as follows:
* PROBING_1 < PROBING_2 < PROBING_3 < ANNOUNCING_1 <
* ANNOUNCING_2 < RESPONDING < ANNOUNCED < CANCELED.
*/
public int compareTo(DNSState state)
{
return ordinal - state.ordinal;
}
}
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