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 }