1 /* 2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package javafx.beans; 27 28 /** 29 * {@code WeakListener} is the super interface of all weak listener implementations 30 * JavaFX runtime. Usually it should not be used directly, but instead one of the 31 * sub-interfaces will be used. 32 * 33 * @see WeakInvalidationListener 34 * @see javafx.beans.value.WeakChangeListener 35 * 36 * 37 * @since JavaFX 2.1 38 */ 39 public interface WeakListener { 40 /** 41 * Returns {@code true} if the linked listener was garbage-collected. 42 * In this case, the listener can be removed from the observable. 43 * 44 * @return {@code true} if the linked listener was garbage-collected. 45 */ 46 boolean wasGarbageCollected(); 47 }