Added multichat operation set definition and Gibberish protocol implementation. Related issues: Issue #241 , Issue #244, Issue #250

Added a listener that would receive notifications of message events occurring in a chat room.

src/net/java/sip/communicator/service/protocol/event/ChatRoomMessageListener.java

@@ -0,0 +1,45 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.service.protocol.event;
+
+import java.util.*;
+
+
+/**
+ * A listener that registers for <tt>ChatRoomMessageEvent</tt>s issued by a
+ * particular <tt>ChatRoom</tt>.
+ *
+ * @author Emil Ivov
+ */
+public interface ChatRoomMessageListener
+    extends EventListener
+{
+    /**
+     * Called when a new incoming <tt>Message</tt> has been received.
+     * @param evt the <tt>ChatRoomMessageReceivedEvent</tt> containing the newly
+     * received message, its sender and other details.
+     */
+    public void messageReceived(ChatRoomMessageReceivedEvent evt);
+
+    /**
+     * Called when the underlying implementation has received an indication
+     * that a message, sent earlier has been successfully received by the
+     * destination.
+     * @param evt the <tt>ChatRoomMessageDeliveredEvent</tt> containing the id
+     * of the message that has caused the event.
+     */
+    public void messageDelivered(ChatRoomMessageDeliveredEvent evt);
+
+    /**
+     * Called to indicate that delivery of a message sent earlier to the chat
+     * room has failed. Reason code and phrase are contained by the
+     * <tt>MessageFailedEvent</tt>
+     * @param evt the <tt>ChatroomMessageDeliveryFailedEvent</tt> containing
+     * the ID of the message whose delivery has failed.
+     */
+    public void messageDeliveryFailed(ChatRoomMessageDeliveryFailedEvent evt);
+}