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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.net.util;
19  
20  import java.io.Serializable;
21  import java.util.EventListener;
22  import java.util.Iterator;
23  import java.util.concurrent.CopyOnWriteArrayList;
24  
25  /**
26   */
27  
28  public class ListenerList implements Serializable, Iterable<EventListener>
29  {
30      private static final long serialVersionUID = -1934227607974228213L;
31  
32      private final CopyOnWriteArrayList<EventListener> __listeners;
33  
34      public ListenerList()
35      {
36          __listeners = new CopyOnWriteArrayList<EventListener>();
37      }
38  
39      public void addListener(EventListener listener)
40      {
41              __listeners.add(listener);
42      }
43  
44      public  void removeListener(EventListener listener)
45      {
46              __listeners.remove(listener);
47      }
48  
49      public int getListenerCount()
50      {
51          return __listeners.size();
52      }
53  
54      /**
55       * Return an {@link Iterator} for the {@link EventListener} instances.
56       *
57       * @return an {@link Iterator} for the {@link EventListener} instances
58       * @since 2.0
59       * TODO Check that this is a good defensive strategy
60       */
61  //    @Override
62      public Iterator<EventListener> iterator() {
63              return __listeners.iterator();
64      }
65  
66  }