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Java > Open Source Codes > org > netbeans > modules > versioning > util > ListenersSupport


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19
20 package org.netbeans.modules.versioning.util;
21
22 import java.util.*;
23
24 /**
25  * Support for firing versioning events.
26  *
27  * @author Maros Sandor
28  */
29 public class ListenersSupport {
30
31     private final Object JavaDoc source;
32     private HashSet listeners = new HashSet(1);
33
34     public ListenersSupport(Object JavaDoc source) {
35         this.source = source;
36     }
37
38     public synchronized void addListener(VersioningListener listener) {
39         HashSet copy = (HashSet) listeners.clone();
40         copy.add(listener);
41         listeners = copy;
42     }
43
44     public synchronized void removeListener(VersioningListener listener) {
45         HashSet copy = (HashSet) listeners.clone();
46         copy.remove(listener);
47         listeners = copy;
48     }
49     
50     public void fireVersioningEvent(Object JavaDoc eventID) {
51         fireVersioningEvent(new VersioningEvent(source, eventID, null));
52     }
53
54     public void fireVersioningEvent(Object JavaDoc eventID, Object JavaDoc param) {
55         fireVersioningEvent(new VersioningEvent(source, eventID, new Object JavaDoc [] { param }));
56     }
57     
58     public void fireVersioningEvent(Object JavaDoc eventID, Object JavaDoc [] params) {
59         fireVersioningEvent(new VersioningEvent(source, eventID, params));
60     }
61     
62     private void fireVersioningEvent(VersioningEvent event) {
63         for (Iterator i = listeners.iterator(); i.hasNext();) {
64             VersioningListener listener = (VersioningListener) i.next();
65             listener.versioningEvent(event);
66         }
67     }
68 }
69
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