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/**
* $RCSfile$
* $Revision: 2407 $
* $Date: 2004-11-02 15:37:00 -0800 (Tue, 02 Nov 2004) $
*
* Copyright 2003-2007 Jive Software.
*
* All rights reserved. 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 org.jivesoftware.smackx;
import org.jivesoftware.smack.*;
import org.jivesoftware.smack.util.collections.ReferenceMap;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.filter.NotFilter;
import org.jivesoftware.smack.filter.PacketExtensionFilter;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smackx.packet.ChatStateExtension;
import java.util.Map;
import java.util.WeakHashMap;
/**
* Handles chat state for all chats on a particular Connection. This class manages both the
* packet extensions and the disco response neccesary for compliance with
* <a href="http://www.xmpp.org/extensions/xep-0085.html">XEP-0085</a>.
*
* NOTE: {@link org.jivesoftware.smackx.ChatStateManager#getInstance(org.jivesoftware.smack.Connection)}
* needs to be called in order for the listeners to be registered appropriately with the connection.
* If this does not occur you will not receive the update notifications.
*
* @author Alexander Wenckus
* @see org.jivesoftware.smackx.ChatState
* @see org.jivesoftware.smackx.packet.ChatStateExtension
*/
public class ChatStateManager {
private static final Map<Connection, ChatStateManager> managers =
new WeakHashMap<Connection, ChatStateManager>();
private static final PacketFilter filter = new NotFilter(
new PacketExtensionFilter("http://jabber.org/protocol/chatstates"));
/**
* Returns the ChatStateManager related to the Connection and it will create one if it does
* not yet exist.
*
* @param connection the connection to return the ChatStateManager
* @return the ChatStateManager related the the connection.
*/
public static ChatStateManager getInstance(final Connection connection) {
if(connection == null) {
return null;
}
synchronized (managers) {
ChatStateManager manager = managers.get(connection);
if (manager == null) {
manager = new ChatStateManager(connection);
manager.init();
managers.put(connection, manager);
}
return manager;
}
}
private final Connection connection;
private final OutgoingMessageInterceptor outgoingInterceptor = new OutgoingMessageInterceptor();
private final IncomingMessageInterceptor incomingInterceptor = new IncomingMessageInterceptor();
/**
* Maps chat to last chat state.
*/
private final Map<Chat, ChatState> chatStates =
new ReferenceMap<Chat, ChatState>(ReferenceMap.WEAK, ReferenceMap.HARD);
private ChatStateManager(Connection connection) {
this.connection = connection;
}
private void init() {
connection.getChatManager().addOutgoingMessageInterceptor(outgoingInterceptor,
filter);
connection.getChatManager().addChatListener(incomingInterceptor);
ServiceDiscoveryManager.getInstanceFor(connection)
.addFeature("http://jabber.org/protocol/chatstates");
}
/**
* Sets the current state of the provided chat. This method will send an empty bodied Message
* packet with the state attached as a {@link org.jivesoftware.smack.packet.PacketExtension}, if
* and only if the new chat state is different than the last state.
*
* @param newState the new state of the chat
* @param chat the chat.
* @throws org.jivesoftware.smack.XMPPException
* when there is an error sending the message
* packet.
*/
public void setCurrentState(ChatState newState, Chat chat) throws XMPPException {
if(chat == null || newState == null) {
throw new IllegalArgumentException("Arguments cannot be null.");
}
if(!updateChatState(chat, newState)) {
return;
}
Message message = new Message();
ChatStateExtension extension = new ChatStateExtension(newState);
message.addExtension(extension);
chat.sendMessage(message);
}
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ChatStateManager that = (ChatStateManager) o;
return connection.equals(that.connection);
}
public int hashCode() {
return connection.hashCode();
}
private boolean updateChatState(Chat chat, ChatState newState) {
ChatState lastChatState = chatStates.get(chat);
if (lastChatState != newState) {
chatStates.put(chat, newState);
return true;
}
return false;
}
private void fireNewChatState(Chat chat, ChatState state) {
for (MessageListener listener : chat.getListeners()) {
if (listener instanceof ChatStateListener) {
((ChatStateListener) listener).stateChanged(chat, state);
}
}
}
private class OutgoingMessageInterceptor implements PacketInterceptor {
public void interceptPacket(Packet packet) {
Message message = (Message) packet;
Chat chat = connection.getChatManager().getThreadChat(message.getThread());
if (chat == null) {
return;
}
if (updateChatState(chat, ChatState.active)) {
message.addExtension(new ChatStateExtension(ChatState.active));
}
}
}
private class IncomingMessageInterceptor implements ChatManagerListener, MessageListener {
public void chatCreated(final Chat chat, boolean createdLocally) {
chat.addMessageListener(this);
}
public void processMessage(Chat chat, Message message) {
PacketExtension extension
= message.getExtension("http://jabber.org/protocol/chatstates");
if (extension == null) {
return;
}
ChatState state;
try {
state = ChatState.valueOf(extension.getElementName());
}
catch (Exception ex) {
return;
}
fireNewChatState(chat, state);
}
}
}
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