01: //
02: // Informa -- RSS Library for Java
03: // Copyright (c) 2002 by Niko Schmuck
04: //
05: // Niko Schmuck
06: // http://sourceforge.net/projects/informa
07: // mailto:niko_schmuck@users.sourceforge.net
08: //
09: // 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: // $Id: ChannelObservableIF.java,v 1.3 2004/01/30 20:36:05 niko_schmuck Exp $
27:
28: package de.nava.informa.core;
29:
30: /**
31: * Classes implementing this interface may want to inform the
32: * subscribed observers that a specific channel event has
33: * happend (like for example a new item was found).</p>
34: *
35: * This interface is usually called Subject in the Observer
36: * pattern.</p>
37: *
38: * @author Niko Schmuck (niko@nava.de)
39: */
40: public interface ChannelObservableIF {
41:
42: /**
43: * Adds an observer to the set of observers for this object.
44: */
45: void addObserver(ChannelObserverIF o);
46:
47: /**
48: * Removes an observer from the set of observers of this object.
49: */
50: void removeObserver(ChannelObserverIF o);
51:
52: }
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