001/* 002 * $Id: EventListenerMap.java 3189 2009-01-20 17:46:04Z kschaefe $ 003 * 004 * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle, 005 * Santa Clara, California 95054, U.S.A. All rights reserved. 006 * 007 * This library is free software; you can redistribute it and/or 008 * modify it under the terms of the GNU Lesser General Public 009 * License as published by the Free Software Foundation; either 010 * version 2.1 of the License, or (at your option) any later version. 011 * 012 * This library is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * You should have received a copy of the GNU Lesser General Public 018 * License along with this library; if not, write to the Free Software 019 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 020 */ 021package org.jdesktop.swingx.event; 022 023import java.util.ArrayList; 024import java.util.EventListener; 025import java.util.HashMap; 026import java.util.List; 027import java.util.Map; 028 029/** 030 * Intended to be a replacement for {@link javax.swing.event.EventListenerList}. 031 * 032 * @author Joshua Outwater 033 * @author Karl Schaefer 034 * @see javax.swing.event.EventListenerList 035 */ 036public class EventListenerMap { 037 private final Map<Class<? extends EventListener>, List<? extends EventListener>> listenerList = 038 new HashMap<Class<? extends EventListener>, List<? extends EventListener>>(); 039 040 /** 041 * Returns a list containing all of the listeners managed by this {@code EventListenerMap}. 042 * 043 * @return all managed listeners 044 */ 045 public List<EventListener> getListeners() { 046 List<EventListener> listeners = new ArrayList<EventListener>(); 047 048 for (List<? extends EventListener> list : listenerList.values()) { 049 listeners.addAll(list); 050 } 051 052 return listeners; 053 } 054 055 /** 056 * Return a list of all the listeners of the given type. 057 * 058 * @return all of the listeners of the specified type. 059 */ 060 @SuppressWarnings("unchecked") 061 public <T extends EventListener> List<T> getListeners(Class<T> clazz) { 062 List<T> list = (List<T>) listenerList.get(clazz); 063 if (list == null) { 064 list = new ArrayList<T>(); 065 } 066 return list; 067 } 068 069 /** 070 * Returns the total number of listeners of the supplied type 071 * for this listener list. 072 */ 073 public int getListenerCount() { 074 int count = 0; 075 076 for (List<? extends EventListener> list : listenerList.values()) { 077 count += list.size(); 078 } 079 080 return count; 081 } 082 083 /** 084 * Returns the total number of listeners for this listener type. 085 */ 086 @SuppressWarnings("unchecked") 087 public <T extends EventListener> int getListenerCount(Class<T> clazz) { 088 List<T> list = (List<T>) listenerList.get(clazz); 089 if (list != null) { 090 return list.size(); 091 } 092 return 0; 093 } 094 095 /** 096 * Adds the listener as a listener of the specified type. 097 * 098 * @param <T> 099 * the type of the listener to be added 100 * @param clazz 101 * the class type to add 102 * @param l 103 * the listener to be added 104 */ 105 @SuppressWarnings("unchecked") 106 public synchronized <T extends EventListener> void add(Class<T> clazz, T listener) { 107 if (listener == null) { 108 return; 109 } 110 111 List<T> list = (List<T>) listenerList.get(clazz); 112 if (list == null) { 113 list = new ArrayList<T>(); 114 listenerList.put(clazz, list); 115 } 116 list.add(listener); 117 } 118 119 /** 120 * Removes the listener as a listener of the specified type. 121 * 122 * @param <T> 123 * the type of the listener to remove 124 * @param clazz 125 * the class type to remove 126 * @param l 127 * the listener to remove 128 */ 129 @SuppressWarnings("unchecked") 130 public synchronized <T extends EventListener> void remove(Class<T> clazz, T listener) { 131 if (listener == null) { 132 return; 133 } 134 135 List<T> list = (List<T>) listenerList.get(clazz); 136 if (list != null) { 137 list.remove(listener); 138 } 139 } 140}