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Java > Open Source Codes > org > apache > directory > ldapstudio > browser > common > widgets > BrowserWidget


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements. See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership. The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the
7  * "License"); you may not use this file except in compliance
8  * with the License. You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing,
13  * software distributed under the License is distributed on an
14  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15  * KIND, either express or implied. See the License for the
16  * specific language governing permissions and limitations
17  * under the License.
18  *
19  */
20
21 package org.apache.directory.ldapstudio.browser.common.widgets;
22
23
24 import java.util.ArrayList JavaDoc;
25 import java.util.Iterator JavaDoc;
26 import java.util.List JavaDoc;
27
28
29 /**
30  * Base class that provides support for {@link WidgetModifyListener}
31  * registration and notification.
32  *
33  * @author <a HREF="mailto:dev@directory.apache.org">Apache Directory Project</a>
34  * @version $Rev$, $Date$
35  */
36 public abstract class BrowserWidget
37 {
38
39     /** The listener list */
40     protected List JavaDoc<WidgetModifyListener> modifyListenerList;
41
42
43     /**
44      * Creates a new instance of BrowserWidget.
45      */
46     protected BrowserWidget()
47     {
48         modifyListenerList = new ArrayList JavaDoc<WidgetModifyListener>( 3 );
49     }
50
51
52     /**
53      * Adds the widget modify listener.
54      *
55      * @param listener the listener
56      */
57     public void addWidgetModifyListener( WidgetModifyListener listener )
58     {
59         if ( !modifyListenerList.contains( listener ) )
60         {
61             modifyListenerList.add( listener );
62         }
63     }
64
65
66     /**
67      * Removes the widget modify listener.
68      *
69      * @param listener the listener
70      */
71     public void removeWidgetModifyListener( WidgetModifyListener listener )
72     {
73         if ( modifyListenerList.contains( listener ) )
74             modifyListenerList.remove( listener );
75     }
76
77
78     /**
79      * Notifies the listeners.
80      */
81     protected void notifyListeners()
82     {
83         WidgetModifyEvent event = new WidgetModifyEvent( this );
84         for ( Iterator JavaDoc<WidgetModifyListener> it = modifyListenerList.iterator(); it.hasNext(); )
85         {
86             WidgetModifyListener listener = it.next();
87             listener.widgetModified( event );
88         }
89     }
90
91 }
92
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