/* * Copyright (c) 2010, 2013, 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 javafx.beans; import java.lang.ref.WeakReference; import javafx.beans.NamedArg; /** * A {@code WeakInvalidationListener} can be used if an {@link Observable} * should only maintain a weak reference to the listener. This helps to avoid * memory leaks that can occur if observers are not unregistered from observed * objects after use. *
* A {@code WeakInvalidationListener} is created by passing in the original * {@link InvalidationListener}. The {@code WeakInvalidationListener} should * then be registered to listen for changes of the observed object. *
* Note: You have to keep a reference to the {@code InvalidationListener} that
* was passed in as long as it is in use, otherwise it can be garbage collected
* too soon.
*
* @see InvalidationListener
* @see Observable
*
*
* @since JavaFX 2.0
*/
public final class WeakInvalidationListener implements InvalidationListener, WeakListener {
private final WeakReference