From df353199d0f36a421bec176d15153d58d88dc9a9 Mon Sep 17 00:00:00 2001
From: Matt Tucker <matt@jivesoftware.com>
Date: Wed, 2 Apr 2003 22:46:40 +0000
Subject: [PATCH] Added ability to add listeners.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@1861 b35dd754-fafc-0310-a699-88a17e54d16e
---
 source/org/jivesoftware/smack/GroupChat.java | 28 ++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/source/org/jivesoftware/smack/GroupChat.java b/source/org/jivesoftware/smack/GroupChat.java
index da20e04cd..c728ab714 100644
--- a/source/org/jivesoftware/smack/GroupChat.java
+++ b/source/org/jivesoftware/smack/GroupChat.java
@@ -75,6 +75,8 @@ public class GroupChat {
     private boolean joined = false;
     private List participants = new ArrayList();
 
+    private PacketFilter presenceFilter;
+    private PacketFilter messageFilter;
     private PacketCollector messageCollector;
 
     /**
@@ -89,11 +91,11 @@ public class GroupChat {
         this.connection = connection;
         this.room = room;
         // Create a collector for all incoming messages.
-        PacketFilter messageFilter = new AndFilter(new FromContainsFilter(room),
+        messageFilter = new AndFilter(new FromContainsFilter(room),
                 new PacketTypeFilter(Message.class));
         messageCollector = connection.createPacketCollector(messageFilter);
         // Create a listener for all presence updates.
-        PacketFilter presenceFilter = new AndFilter(new FromContainsFilter(room),
+        presenceFilter = new AndFilter(new FromContainsFilter(room),
                 new PacketTypeFilter(Presence.class));
         connection.addPacketListener(new PacketListener() {
             public void processPacket(Packet packet) {
@@ -213,6 +215,18 @@ public class GroupChat {
         }
     }
 
+    /**
+     * Adds a packet listener that will be notified of any new Presence packets
+     * sent to the group chat. Using a listener is a suitable way to know when the list
+     * of participants should be re-loaded due to any changes.
+     *
+     * @param listener a packet listener that will be notified of any presence packets
+     *      sent to the group chat.
+     */
+    public void addParticipantListner(PacketListener listener) {
+        connection.addPacketListener(listener, presenceFilter);
+    }
+
     /**
      * Sends a message to the chat room.
      *
@@ -281,4 +295,14 @@ public class GroupChat {
     public Message nextMessage(long timeout) {
         return (Message)messageCollector.nextResult(timeout);
     }
+
+    /**
+     * Adds a packet listener that will be notified of any new messages in the
+     * group chat.
+     *
+     * @param listener a packet listener.
+     */
+    public void addMessageListener(PacketListener listener) {
+        connection.addPacketListener(listener, messageFilter);
+    }
 }