org.jivesoftware.smack.Chat Maven / Gradle / Ivy

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Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.
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/**
 * $RCSfile$
 * $Revision: 11613 $
 * $Date: 2010-02-09 05:55:56 -0600 (Tue, 09 Feb 2010) $
 *
 * 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.smack;

import org.jivesoftware.smack.packet.Message;

import java.util.Set;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * A chat is a series of messages sent between two users. Each chat has a unique
 * thread ID, which is used to track which messages are part of a particular
 * conversation. Some messages are sent without a thread ID, and some clients
 * don't send thread IDs at all. Therefore, if a message without a thread ID
 * arrives it is routed to the most recently created Chat with the message
 * sender.
 * 
 * @author Matt Tucker
 */
public class Chat {

    private ChatManager chatManager;
    private String threadID;
    private String participant;
    private final Set listeners = new CopyOnWriteArraySet();

    /**
     * Creates a new chat with the specified user and thread ID.
     *
     * @param chatManager the chatManager the chat will use.
     * @param participant the user to chat with.
     * @param threadID the thread ID to use.
     */
    Chat(ChatManager chatManager, String participant, String threadID) {
        this.chatManager = chatManager;
        this.participant = participant;
        this.threadID = threadID;
    }

    /**
     * Returns the thread id associated with this chat, which corresponds to the
     * thread field of XMPP messages. This method may return null
     * if there is no thread ID is associated with this Chat.
     *
     * @return the thread ID of this chat.
     */
    public String getThreadID() {
        return threadID;
    }

    /**
     * Returns the name of the user the chat is with.
     *
     * @return the name of the user the chat is occuring with.
     */
    public String getParticipant() {
        return participant;
    }

    /**
     * Sends the specified text as a message to the other chat participant.
     * This is a convenience method for:
     *
     *      *     Message message = chat.createMessage();
     *     message.setBody(messageText);
     *     chat.sendMessage(message);
     * 
     *
     * @param text the text to send.
     * @throws XMPPException if sending the message fails.
     */
    public void sendMessage(String text) throws XMPPException {
        Message message = new Message(participant, Message.Type.chat);
        message.setThread(threadID);
        message.setBody(text);
        chatManager.sendMessage(this, message);
    }

    /**
     * Sends a message to the other chat participant. The thread ID, recipient,
     * and message type of the message will automatically set to those of this chat.
     *
     * @param message the message to send.
     * @throws XMPPException if an error occurs sending the message.
     */
    public void sendMessage(Message message) throws XMPPException {
        // Force the recipient, message type, and thread ID since the user elected
        // to send the message through this chat object.
        message.setTo(participant);
        message.setType(Message.Type.chat);
        message.setThread(threadID);
        chatManager.sendMessage(this, message);
    }

    /**
     * Adds a packet listener that will be notified of any new messages in the
     * chat.
     *
     * @param listener a packet listener.
     */
    public void addMessageListener(MessageListener listener) {
        if(listener == null) {
            return;
        }
        // TODO these references should be weak.
        listeners.add(listener);
    }

    public void removeMessageListener(MessageListener listener) {
        listeners.remove(listener);
    }

    /**
     * Returns an unmodifiable collection of all of the listeners registered with this chat.
     *
     * @return an unmodifiable collection of all of the listeners registered with this chat.
     */
    public Collection getListeners() {
        return Collections.unmodifiableCollection(listeners);
    }

    /**
     * Creates a {@link org.jivesoftware.smack.PacketCollector} which will accumulate the Messages
     * for this chat. Always cancel PacketCollectors when finished with them as they will accumulate
     * messages indefinitely.
     *
     * @return the PacketCollector which returns Messages for this chat.
     */
    public PacketCollector createCollector() {
        return chatManager.createPacketCollector(this);
    }

    /**
     * Delivers a message directly to this chat, which will add the message
     * to the collector and deliver it to all listeners registered with the
     * Chat. This is used by the Connection class to deliver messages
     * without a thread ID.
     *
     * @param message the message.
     */
    void deliver(Message message) {
        // Because the collector and listeners are expecting a thread ID with
        // a specific value, set the thread ID on the message even though it
        // probably never had one.
        message.setThread(threadID);

        for (MessageListener listener : listeners) {
            listener.processMessage(this, message);
        }
    }


    @Override
    public boolean equals(Object obj) {
        return obj instanceof Chat
                && threadID.equals(((Chat)obj).getThreadID())
                && participant.equals(((Chat)obj).getParticipant());
    }
}