content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.commons.net.util;
  
  import java.io.Serializable;
  import java.util.EventListener;
  import java.util.Iterator;
  import java.util.concurrent.CopyOnWriteArrayList;
  
  /**
   */
  
  public class ListenerList implements Serializable, Iterable<EventListener>
  {
      private static final long serialVersionUID = -1934227607974228213L;
  
      private final CopyOnWriteArrayList<EventListener> __listeners;
  
      public ListenerList()
      {
          __listeners = new CopyOnWriteArrayList<EventListener>();
      }
  
      public void addListener(EventListener listener)
      {
              __listeners.add(listener);
      }
  
      public  void removeListener(EventListener listener)
      {
              __listeners.remove(listener);
      }
  
      public int getListenerCount()
      {
          return __listeners.size();
      }
  
      /**
       * Return an {@link Iterator} for the {@link EventListener} instances.
       *
       * @return an {@link Iterator} for the {@link EventListener} instances
       * @since 2.0
       * TODO Check that this is a good defensive strategy
       */
      @Override
      public Iterator<EventListener> iterator() {
              return __listeners.iterator();
      }
  
  }
  