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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2344 b35dd754-fafc-0310-a699-88a17e54d16e
298 lines
No EOL
11 KiB
Java
298 lines
No EOL
11 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright (C) 2002-2003 Jive Software. All rights reserved.
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* ====================================================================
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* The Jive Software License (based on Apache Software License, Version 1.1)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by
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* Jive Software (http://www.jivesoftware.com)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Smack" and "Jive Software" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please
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* contact webmaster@jivesoftware.com.
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*
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* 5. Products derived from this software may not be called "Smack",
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* nor may "Smack" appear in their name, without prior written
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* permission of Jive Software.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL JIVE SOFTWARE OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*/
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package org.jivesoftware.smack;
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import org.jivesoftware.smack.packet.Message;
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import org.jivesoftware.smack.util.StringUtils;
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import org.jivesoftware.smack.filter.*;
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/**
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* A chat is a series of messages sent between two users. Each chat can have
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* a unique thread ID, which is used to track which messages are part of a particular
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* conversation.<p>
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*
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* In some situations, it is better to have all messages from the other user delivered
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* to a Chat rather than just the messages that have a particular thread ID. To
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* enable this behavior, call {@link #setFilteredOnThreadID(boolean)} with
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* <tt>false</tt> as the parameter.
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*
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* @see XMPPConnection#createChat(String)
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* @author Matt Tucker
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*/
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public class Chat {
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/**
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* A prefix helps to make sure that ID's are unique across mutliple instances.
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*/
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private static String prefix = StringUtils.randomString(5);
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/**
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* True if only messages that have a matching threadID will be delivered to a Chat. When
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* false, any message from the other participant will be delivered to a Chat.
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*/
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private static boolean filteredOnThreadID = true;
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/**
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* Keeps track of the current increment, which is appended to the prefix to
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* forum a unique ID.
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*/
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private static long id = 0;
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/**
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* Returns the next unique id. Each id made up of a short alphanumeric
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* prefix along with a unique numeric value.
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*
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* @return the next id.
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*/
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private static synchronized String nextID() {
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return prefix + Long.toString(id++);
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}
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private XMPPConnection connection;
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private String threadID;
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private String participant;
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private PacketFilter messageFilter;
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private PacketCollector messageCollector;
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/**
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* Creates a new chat with the specified user.
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*
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* @param connection the connection the chat will use.
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* @param participant the user to chat with.
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*/
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public Chat(XMPPConnection connection, String participant) {
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// Automatically assign the next chat ID.
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this(connection, participant, nextID());
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// If not filtering on thread ID, force the thread ID for this Chat to be null.
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if (!filteredOnThreadID) {
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this.threadID = null;
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}
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}
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/**
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* Creates a new chat with the specified user and thread ID.
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*
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* @param connection the connection the chat will use.
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* @param participant the user to chat with.
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* @param threadID the thread ID to use.
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*/
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public Chat(XMPPConnection connection, String participant, String threadID) {
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this.connection = connection;
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this.participant = participant;
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this.threadID = threadID;
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if (filteredOnThreadID) {
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// Filter the messages whose thread equals Chat's id
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messageFilter = new ThreadFilter(threadID);
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}
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else {
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// Filter the messages of type "chat" and sender equals Chat's participant
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messageFilter =
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new OrFilter(
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new AndFilter(
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new MessageTypeFilter(Message.Type.CHAT),
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new FromContainsFilter(participant)),
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new ThreadFilter(threadID));
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}
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messageCollector = connection.createPacketCollector(messageFilter);
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}
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/**
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* Returns true if only messages that have a matching threadID will be delivered to Chat
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* instances. When false, any message from the other participant will be delivered to Chat instances.
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*
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* @return true if messages delivered to Chat instances are filtered on thread ID.
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*/
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public static boolean isFilteredOnThreadID() {
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return filteredOnThreadID;
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}
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/**
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* Sets whether only messages that have a matching threadID will be delivered to Chat instances.
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* When false, any message from the other participant will be delivered to a Chat instances.
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*
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* @param value true if messages delivered to Chat instances are filtered on thread ID.
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*/
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public static void setFilteredOnThreadID(boolean value) {
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filteredOnThreadID = value;
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}
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/**
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* Returns the thread id associated with this chat, which corresponds to the
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* <tt>thread</tt> field of XMPP messages. This method may return <tt>null</tt>
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* if there is no thread ID is associated with this Chat.
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*
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* @return the thread ID of this chat.
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*/
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public String getThreadID() {
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return threadID;
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}
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/**
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* Returns the name of the user the chat is with.
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*
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* @return the name of the user the chat is occuring with.
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*/
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public String getParticipant() {
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return participant;
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}
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/**
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* Sends the specified text as a message to the other chat participant.
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* This is a convenience method for:
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*
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* <pre>
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* Message message = chat.createMessage();
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* message.setBody(messageText);
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* chat.sendMessage(message);
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* </pre>
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*
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* @param text the text to send.
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* @throws XMPPException if sending the message fails.
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*/
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public void sendMessage(String text) throws XMPPException {
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Message message = createMessage();
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message.setBody(text);
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connection.sendPacket(message);
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}
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/**
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* Creates a new Message to the chat participant. The message returned
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* will have its thread property set with this chat ID.
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*
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* @return a new message addressed to the chat participant and
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* using the correct thread value.
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* @see #sendMessage(Message)
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*/
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public Message createMessage() {
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Message message = new Message(participant, Message.Type.CHAT);
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message.setThread(threadID);
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return message;
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}
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/**
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* Sends a message to the other chat participant. The thread ID, recipient,
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* and message type of the message will automatically set to those of this chat
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* in case the Message was not created using the {@link #createMessage() createMessage}
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* method.
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*
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* @param message the message to send.
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* @throws XMPPException if an error occurs sending the message.
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*/
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public void sendMessage(Message message) throws XMPPException {
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// Force the recipient, message type, and thread ID since the user elected
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// to send the message through this chat object.
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message.setTo(participant);
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message.setType(Message.Type.CHAT);
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message.setThread(threadID);
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connection.sendPacket(message);
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}
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/**
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* Polls for and returns the next message, or <tt>null</tt> if there isn't
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* a message immediately available. This method provides significantly different
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* functionalty than the {@link #nextMessage()} method since it's non-blocking.
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* In other words, the method call will always return immediately, whereas the
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* nextMessage method will return only when a message is available (or after
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* a specific timeout).
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*
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* @return the next message if one is immediately available and
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* <tt>null</tt> otherwise.
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*/
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public Message pollMessage() {
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return (Message)messageCollector.pollResult();
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}
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/**
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* Returns the next available message in the chat. The method call will block
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* (not return) until a message is available.
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*
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* @return the next message.
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*/
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public Message nextMessage() {
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return (Message)messageCollector.nextResult();
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}
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/**
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* Returns the next available message in the chat. The method call will block
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* (not return) until a packet is available or the <tt>timeout</tt> has elapased.
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* If the timeout elapses without a result, <tt>null</tt> will be returned.
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*
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* @param timeout the maximum amount of time to wait for the next message.
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* @return the next message, or <tt>null</tt> if the timeout elapses without a
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* message becoming available.
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*/
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public Message nextMessage(long timeout) {
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return (Message)messageCollector.nextResult(timeout);
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}
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/**
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* Adds a packet listener that will be notified of any new messages in the
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* chat.
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*
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* @param listener a packet listener.
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*/
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public void addMessageListener(PacketListener listener) {
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connection.addPacketListener(listener, messageFilter);
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}
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public void finalize() throws Throwable {
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super.finalize();
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try {
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if (messageCollector != null) {
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messageCollector.cancel();
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}
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}
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catch (Exception e) {}
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}
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} |