| /* |
| * Copyright (c) 2000, 2004, 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.util; |
| |
| /** |
| * An abstract wrapper class for an {@code EventListener} class |
| * which associates a set of additional parameters with the listener. |
| * Subclasses must provide the storage and accessor methods |
| * for the additional arguments or parameters. |
| * <p> |
| * For example, a bean which supports named properties |
| * would have a two argument method signature for adding |
| * a {@code PropertyChangeListener} for a property: |
| * <pre> |
| * public void addPropertyChangeListener(String propertyName, |
| * PropertyChangeListener listener) |
| * </pre> |
| * If the bean also implemented the zero argument get listener method: |
| * <pre> |
| * public PropertyChangeListener[] getPropertyChangeListeners() |
| * </pre> |
| * then the array may contain inner {@code PropertyChangeListeners} |
| * which are also {@code PropertyChangeListenerProxy} objects. |
| * <p> |
| * If the calling method is interested in retrieving the named property |
| * then it would have to test the element to see if it is a proxy class. |
| * |
| * @since 1.4 |
| */ |
| public abstract class EventListenerProxy<T extends EventListener> |
| implements EventListener { |
| |
| private final T listener; |
| |
| /** |
| * Creates a proxy for the specified listener. |
| * |
| * @param listener the listener object |
| */ |
| public EventListenerProxy(T listener) { |
| this.listener = listener; |
| } |
| |
| /** |
| * Returns the listener associated with the proxy. |
| * |
| * @return the listener associated with the proxy |
| */ |
| public T getListener() { |
| return this.listener; |
| } |
| } |