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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  }