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1   /*
2    *  XNap - A P2P framework and client.
3    *
4    *  See the file AUTHORS for copyright information.
5    *
6    *  This program is free software; you can redistribute it and/or modify
7    *  it under the terms of the GNU General Public License as published by
8    *  the Free Software Foundation.
9    *
10   *  This program is distributed in the hope that it will be useful,
11   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   *  GNU General Public License for more details.
14   *
15   *  You should have received a copy of the GNU General Public License
16   *  along with this program; if not, write to the Free Software
17   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18   */
19  
20  package org.xnap.chat;
21  
22  import java.util.List;
23  import java.util.Vector;
24  
25  /***
26   * This is a utility class that can be used by {@link ChatProvider}
27   * classes for handling channel event listeners.  
28   */
29  public class ChatProviderSupport { 
30  
31      //--- Data field(s) ---
32  
33      private Object source;
34      private List listeners = new Vector();
35  
36      //--- Constructor(s) ---
37      
38      /***
39       * Constructs a ChatProviderSupport object.
40       *
41       * @param source the object to be given as the source for any events
42       */
43      public ChatProviderSupport(Object source)
44      {
45  	this.source = source;
46      }
47  
48      //--- Method(s) ---
49  
50      public void addChatProviderListener(ChatProviderListener l) 
51      {
52          listeners.add(l);
53      }
54  
55      public void removeChatProviderListener(ChatProviderListener l) 
56      {
57          listeners.remove(l);
58      }
59  
60      public void fireMessageReceived(String message)
61      {
62          Object[] array = listeners.toArray();
63  
64  	if (array != null) {
65  	    ChatProviderEvent event 
66  		= new ChatProviderEvent(source, message);
67  
68  	    for (int i = array.length - 1; i >= 0; i--) {
69  		((ChatProviderListener)array[i]).messageReceived(event);
70  	    }
71  	}
72      }   
73  
74      public void fireChannelsUpdated()
75      {
76          Object[] array = listeners.toArray();
77  
78  	if (array != null) {
79  	    ChatProviderEvent event = new ChatProviderEvent(source);
80  
81  	    for (int i = array.length - 1; i >= 0; i--) {
82  		((ChatProviderListener)array[i]).channelsUpdated(event);
83  	    }
84  	}
85      }   
86  
87  }