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Java > Open Source Codes > de > nava > informa > core > ChannelObservableIF


1 //
2 // Informa -- RSS Library for Java
3 // Copyright (c) 2002 by Niko Schmuck
4 //
5 // Niko Schmuck
6 // http://sourceforge.net/projects/informa
7 // mailto:niko_schmuck@users.sourceforge.net
8 //
9 // This library is free software.
10 //
11 // You may redistribute it and/or modify it under the terms of the GNU
12 // Lesser General Public License as published by the Free Software Foundation.
13 //
14 // Version 2.1 of the license should be included with this distribution in
15 // the file LICENSE. If the license is not included with this distribution,
16 // you may find a copy at the FSF web site at 'www.gnu.org' or 'www.fsf.org',
17 // or you may write to the Free Software Foundation, 675 Mass Ave, Cambridge,
18 // MA 02139 USA.
19 //
20 // This library is distributed in the hope that it will be useful,
21 // but WITHOUT ANY WARRANTY; without even the implied waranty of
22 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 // Lesser General Public License for more details.
24 //
25
26
27 // $Id: ChannelObservableIF.java,v 1.3 2004/01/30 20:36:05 niko_schmuck Exp $
28
29 package de.nava.informa.core;
30
31 /**
32  * Classes implementing this interface may want to inform the
33  * subscribed observers that a specific channel event has
34  * happend (like for example a new item was found).</p>
35  *
36  * This interface is usually called Subject in the Observer
37  * pattern.</p>
38  *
39  * @author Niko Schmuck (niko@nava.de)
40  */
41 public interface ChannelObservableIF {
42
43   /**
44    * Adds an observer to the set of observers for this object.
45    */
46   void addObserver(ChannelObserverIF o);
47
48   /**
49    * Removes an observer from the set of observers of this object.
50    */
51   void removeObserver(ChannelObserverIF o);
52   
53 }
54
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