1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rt/emul/compact/src/main/java/java/util/EventListenerProxy.java Tue Jan 17 07:04:06 2017 +0100
1.3 @@ -0,0 +1,75 @@
1.4 +/*
1.5 + * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package java.util;
1.30 +
1.31 +/**
1.32 + * An abstract wrapper class for an {@code EventListener} class
1.33 + * which associates a set of additional parameters with the listener.
1.34 + * Subclasses must provide the storage and accessor methods
1.35 + * for the additional arguments or parameters.
1.36 + * <p>
1.37 + * For example, a bean which supports named properties
1.38 + * would have a two argument method signature for adding
1.39 + * a {@code PropertyChangeListener} for a property:
1.40 + * <pre>
1.41 + * public void addPropertyChangeListener(String propertyName,
1.42 + * PropertyChangeListener listener)
1.43 + * </pre>
1.44 + * If the bean also implemented the zero argument get listener method:
1.45 + * <pre>
1.46 + * public PropertyChangeListener[] getPropertyChangeListeners()
1.47 + * </pre>
1.48 + * then the array may contain inner {@code PropertyChangeListeners}
1.49 + * which are also {@code PropertyChangeListenerProxy} objects.
1.50 + * <p>
1.51 + * If the calling method is interested in retrieving the named property
1.52 + * then it would have to test the element to see if it is a proxy class.
1.53 + *
1.54 + * @since 1.4
1.55 + */
1.56 +public abstract class EventListenerProxy<T extends EventListener>
1.57 + implements EventListener {
1.58 +
1.59 + private final T listener;
1.60 +
1.61 + /**
1.62 + * Creates a proxy for the specified listener.
1.63 + *
1.64 + * @param listener the listener object
1.65 + */
1.66 + public EventListenerProxy(T listener) {
1.67 + this.listener = listener;
1.68 + }
1.69 +
1.70 + /**
1.71 + * Returns the listener associated with the proxy.
1.72 + *
1.73 + * @return the listener associated with the proxy
1.74 + */
1.75 + public T getListener() {
1.76 + return this.listener;
1.77 + }
1.78 +}