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211 lines
7.3 KiB
Java
211 lines
7.3 KiB
Java
/**
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* $RCSfile$
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* $Revision: 2407 $
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* $Date: 2004-11-02 15:37:00 -0800 (Tue, 02 Nov 2004) $
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*
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* Copyright 2003-2007 Jive Software.
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*
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* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx;
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import java.lang.ref.WeakReference;
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import java.util.Map;
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import java.util.WeakHashMap;
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import org.jivesoftware.smack.Chat;
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import org.jivesoftware.smack.ChatManagerListener;
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import org.jivesoftware.smack.Connection;
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import org.jivesoftware.smack.MessageListener;
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import org.jivesoftware.smack.PacketInterceptor;
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import org.jivesoftware.smack.XMPPException;
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import org.jivesoftware.smack.filter.NotFilter;
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import org.jivesoftware.smack.filter.PacketExtensionFilter;
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import org.jivesoftware.smack.filter.PacketFilter;
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import org.jivesoftware.smack.packet.Message;
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import org.jivesoftware.smack.packet.Packet;
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import org.jivesoftware.smack.packet.PacketExtension;
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import org.jivesoftware.smack.util.collections.ReferenceMap;
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import org.jivesoftware.smackx.packet.ChatStateExtension;
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/**
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* Handles chat state for all chats on a particular Connection. This class manages both the
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* packet extensions and the disco response neccesary for compliance with
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* <a href="http://www.xmpp.org/extensions/xep-0085.html">XEP-0085</a>.
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*
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* NOTE: {@link org.jivesoftware.smackx.ChatStateManager#getInstance(org.jivesoftware.smack.Connection)}
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* needs to be called in order for the listeners to be registered appropriately with the connection.
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* If this does not occur you will not receive the update notifications.
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*
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* @author Alexander Wenckus
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* @see org.jivesoftware.smackx.ChatState
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* @see org.jivesoftware.smackx.packet.ChatStateExtension
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*/
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public class ChatStateManager {
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private static final Map<Connection, WeakReference<ChatStateManager>> managers =
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new WeakHashMap<Connection, WeakReference<ChatStateManager>>();
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private static final PacketFilter filter = new NotFilter(
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new PacketExtensionFilter("http://jabber.org/protocol/chatstates"));
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/**
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* Returns the ChatStateManager related to the Connection and it will create one if it does
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* not yet exist.
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*
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* @param connection the connection to return the ChatStateManager
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* @return the ChatStateManager related the the connection.
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*/
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public static ChatStateManager getInstance(final Connection connection) {
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if(connection == null) {
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return null;
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}
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synchronized (managers) {
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ChatStateManager manager;
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WeakReference<ChatStateManager> ref = managers.get(connection);
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if (ref == null) {
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manager = new ChatStateManager(connection);
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manager.init();
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managers.put(connection, new WeakReference<ChatStateManager>(manager));
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}
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else
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manager = ref.get();
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return manager;
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}
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}
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private final Connection connection;
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private final OutgoingMessageInterceptor outgoingInterceptor = new OutgoingMessageInterceptor();
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private final IncomingMessageInterceptor incomingInterceptor = new IncomingMessageInterceptor();
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/**
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* Maps chat to last chat state.
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*/
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private final Map<Chat, ChatState> chatStates =
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new ReferenceMap<Chat, ChatState>(ReferenceMap.WEAK, ReferenceMap.HARD);
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private ChatStateManager(Connection connection) {
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this.connection = connection;
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}
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private void init() {
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connection.getChatManager().addOutgoingMessageInterceptor(outgoingInterceptor,
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filter);
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connection.getChatManager().addChatListener(incomingInterceptor);
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ServiceDiscoveryManager.getInstanceFor(connection)
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.addFeature("http://jabber.org/protocol/chatstates");
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}
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/**
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* Sets the current state of the provided chat. This method will send an empty bodied Message
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* packet with the state attached as a {@link org.jivesoftware.smack.packet.PacketExtension}, if
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* and only if the new chat state is different than the last state.
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*
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* @param newState the new state of the chat
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* @param chat the chat.
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* @throws org.jivesoftware.smack.XMPPException
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* when there is an error sending the message
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* packet.
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*/
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public void setCurrentState(ChatState newState, Chat chat) throws XMPPException {
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if(chat == null || newState == null) {
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throw new IllegalArgumentException("Arguments cannot be null.");
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}
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if(!updateChatState(chat, newState)) {
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return;
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}
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Message message = new Message();
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ChatStateExtension extension = new ChatStateExtension(newState);
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message.addExtension(extension);
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chat.sendMessage(message);
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}
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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ChatStateManager that = (ChatStateManager) o;
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return connection.equals(that.connection);
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}
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public int hashCode() {
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return connection.hashCode();
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}
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private boolean updateChatState(Chat chat, ChatState newState) {
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ChatState lastChatState = chatStates.get(chat);
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if (lastChatState != newState) {
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chatStates.put(chat, newState);
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return true;
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}
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return false;
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}
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private void fireNewChatState(Chat chat, ChatState state) {
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for (MessageListener listener : chat.getListeners()) {
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if (listener instanceof ChatStateListener) {
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((ChatStateListener) listener).stateChanged(chat, state);
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}
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}
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}
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private class OutgoingMessageInterceptor implements PacketInterceptor {
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public void interceptPacket(Packet packet) {
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Message message = (Message) packet;
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Chat chat = connection.getChatManager().getThreadChat(message.getThread());
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if (chat == null) {
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return;
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}
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if (updateChatState(chat, ChatState.active)) {
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message.addExtension(new ChatStateExtension(ChatState.active));
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}
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}
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}
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private class IncomingMessageInterceptor implements ChatManagerListener, MessageListener {
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public void chatCreated(final Chat chat, boolean createdLocally) {
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chat.addMessageListener(this);
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}
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public void processMessage(Chat chat, Message message) {
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PacketExtension extension
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= message.getExtension("http://jabber.org/protocol/chatstates");
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if (extension == null) {
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return;
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}
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ChatState state;
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try {
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state = ChatState.valueOf(extension.getElementName());
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}
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catch (Exception ex) {
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return;
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}
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fireNewChatState(chat, state);
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}
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}
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}
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