1 /*
2 * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
3 * the spring framework, http://el4j.sf.net
4 * Copyright (C) 2006 by ELCA Informatique SA, Av. de la Harpe 22-24,
5 * 1000 Lausanne, Switzerland, http://www.elca.ch
6 *
7 * EL4J is published under the GNU Lesser General Public License (LGPL)
8 * Version 2.1. See http://www.gnu.org/licenses/
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 Lesser General Public License for more details.
14 *
15 * For alternative licensing, please contact info@elca.ch
16 */
17 package ch.elca.el4j.services.persistence.generic.dao.impl;
18
19 import java.util.ArrayList;
20 import java.util.List;
21
22 import ch.elca.el4j.services.persistence.generic.dao.DaoChangeListener;
23 import ch.elca.el4j.services.persistence.generic.dao.DaoChangeNotifier;
24
25 /**
26 * A default implementation with no notable features.
27 *
28 * @svnLink $Revision: 3874 $;$Date: 2009-08-04 14:25:40 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/core/src/main/java/ch/elca/el4j/services/persistence/generic/dao/impl/DefaultDaoChangeNotifier.java $
29 *
30 * @author Adrian Moos (AMS)
31 */
32 public class DefaultDaoChangeNotifier
33 implements DaoChangeNotifier {
34
35 /**
36 * The presently subscribed listeners.
37 */
38 protected List<DaoChangeListener> m_listeners
39 = new ArrayList<DaoChangeListener>();
40
41 /**
42 * {@inheritDoc}
43 */
44 public void subscribe(DaoChangeListener cl) {
45 m_listeners.add(cl);
46 }
47
48 /**
49 * {@inheritDoc}
50 */
51 public void unsubscribe(DaoChangeListener cl) {
52 m_listeners.remove(cl);
53 }
54
55 /**
56 * {@inheritDoc}
57 */
58 public void announce(Change change) {
59 List<DaoChangeListener> snapshot
60 = new ArrayList<DaoChangeListener>(m_listeners);
61 for (DaoChangeListener cl : snapshot) {
62 cl.changed(change);
63 }
64 }
65 }