diff -r 3fcc279c921b -r d382dacfd73f rt/emul/compact/src/main/java/java/beans/ChangeListenerMap.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/rt/emul/compact/src/main/java/java/beans/ChangeListenerMap.java Tue Feb 26 16:54:16 2013 +0100 @@ -0,0 +1,248 @@ +/* + * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package java.beans; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.EventListener; +import java.util.EventListenerProxy; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Map.Entry; +import java.util.Set; +import org.apidesign.bck2brwsr.emul.lang.System; + +/** + * This is an abstract class that provides base functionality + * for the {@link PropertyChangeSupport PropertyChangeSupport} class + * and the {@link VetoableChangeSupport VetoableChangeSupport} class. + * + * @see PropertyChangeListenerMap + * @see VetoableChangeListenerMap + * + * @author Sergey A. Malenkov + */ +abstract class ChangeListenerMap { + private Map map; + + /** + * Creates an array of listeners. + * This method can be optimized by using + * the same instance of the empty array + * when {@code length} is equal to {@code 0}. + * + * @param length the array length + * @return an array with specified length + */ + protected abstract L[] newArray(int length); + + /** + * Creates a proxy listener for the specified property. + * + * @param name the name of the property to listen on + * @param listener the listener to process events + * @return a proxy listener + */ + protected abstract L newProxy(String name, L listener); + + /** + * Adds a listener to the list of listeners for the specified property. + * This listener is called as many times as it was added. + * + * @param name the name of the property to listen on + * @param listener the listener to process events + */ + public final synchronized void add(String name, L listener) { + if (this.map == null) { + this.map = new HashMap(); + } + L[] array = this.map.get(name); + int size = (array != null) + ? array.length + : 0; + + L[] clone = newArray(size + 1); + clone[size] = listener; + if (array != null) { + System.arraycopy(array, 0, clone, 0, size); + } + this.map.put(name, clone); + } + + /** + * Removes a listener from the list of listeners for the specified property. + * If the listener was added more than once to the same event source, + * this listener will be notified one less time after being removed. + * + * @param name the name of the property to listen on + * @param listener the listener to process events + */ + public final synchronized void remove(String name, L listener) { + if (this.map != null) { + L[] array = this.map.get(name); + if (array != null) { + for (int i = 0; i < array.length; i++) { + if (listener.equals(array[i])) { + int size = array.length - 1; + if (size > 0) { + L[] clone = newArray(size); + System.arraycopy(array, 0, clone, 0, i); + System.arraycopy(array, i + 1, clone, i, size - i); + this.map.put(name, clone); + } + else { + this.map.remove(name); + if (this.map.isEmpty()) { + this.map = null; + } + } + break; + } + } + } + } + } + + /** + * Returns the list of listeners for the specified property. + * + * @param name the name of the property + * @return the corresponding list of listeners + */ + public final synchronized L[] get(String name) { + return (this.map != null) + ? this.map.get(name) + : null; + } + + /** + * Sets new list of listeners for the specified property. + * + * @param name the name of the property + * @param listeners new list of listeners + */ + public final void set(String name, L[] listeners) { + if (listeners != null) { + if (this.map == null) { + this.map = new HashMap(); + } + this.map.put(name, listeners); + } + else if (this.map != null) { + this.map.remove(name); + if (this.map.isEmpty()) { + this.map = null; + } + } + } + + /** + * Returns all listeners in the map. + * + * @return an array of all listeners + */ + public final synchronized L[] getListeners() { + if (this.map == null) { + return newArray(0); + } + List list = new ArrayList(); + + L[] listeners = this.map.get(null); + if (listeners != null) { + for (L listener : listeners) { + list.add(listener); + } + } + for (Entry entry : this.map.entrySet()) { + String name = entry.getKey(); + if (name != null) { + for (L listener : entry.getValue()) { + list.add(newProxy(name, listener)); + } + } + } + return list.toArray(newArray(list.size())); + } + + /** + * Returns listeners that have been associated with the named property. + * + * @param name the name of the property + * @return an array of listeners for the named property + */ + public final L[] getListeners(String name) { + if (name != null) { + L[] listeners = get(name); + if (listeners != null) { + return listeners.clone(); + } + } + return newArray(0); + } + + /** + * Indicates whether the map contains + * at least one listener to be notified. + * + * @param name the name of the property + * @return {@code true} if at least one listener exists or + * {@code false} otherwise + */ + public final synchronized boolean hasListeners(String name) { + if (this.map == null) { + return false; + } + L[] array = this.map.get(null); + return (array != null) || ((name != null) && (null != this.map.get(name))); + } + + /** + * Returns a set of entries from the map. + * Each entry is a pair consisted of the property name + * and the corresponding list of listeners. + * + * @return a set of entries from the map + */ + public final Set> getEntries() { + return (this.map != null) + ? this.map.entrySet() + : Collections.>emptySet(); + } + + /** + * Extracts a real listener from the proxy listener. + * It is necessary because default proxy class is not serializable. + * + * @return a real listener + */ + public final L extract(L listener) { + while (listener instanceof EventListenerProxy) { + EventListenerProxy proxy = (EventListenerProxy) listener; + listener = proxy.getListener(); + } + return listener; + } +}