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1   /*
2    * Copyright 2001-2005 The Apache Software Foundation
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.net.util;
17  
18  import java.io.Serializable;
19  import java.util.Enumeration;
20  import java.util.EventListener;
21  import java.util.Vector;
22  
23  /***
24   * @author Daniel F. Savarese
25   */
26  
27  public class ListenerList implements Serializable
28  {
29      private Vector __listeners;
30  
31      public ListenerList()
32      {
33          __listeners = new Vector();
34      }
35  
36      public synchronized void addListener(EventListener listener)
37      {
38          __listeners.addElement(listener);
39      }
40  
41      public synchronized void removeListener(EventListener listener)
42      {
43          __listeners.removeElement(listener);
44      }
45  
46      public synchronized Enumeration getListeners()
47      {
48          return ((Vector)__listeners.clone()).elements();
49      }
50  
51      public int getListenerCount()
52      {
53          return __listeners.size();
54      }
55  
56  }