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.collections; 27 28 import com.sun.javafx.binding.SetExpressionHelper; 29 import com.sun.javafx.collections.ObservableSetWrapper; 30 import org.junit.Test; 31 32 import java.util.HashSet; 33 34 import static org.junit.Assert.*; 35 36 public class WeakSetChangeListenerTest { 37 38 @Test(expected=NullPointerException.class) 39 public void testConstructWithNull() { 40 new WeakSetChangeListener<Object>(null); 41 } 42 43 @Test 44 public void testHandle() { 45 MockSetObserver<Object> listener = new MockSetObserver<Object>(); 46 final WeakSetChangeListener<Object> weakListener = new WeakSetChangeListener<Object>(listener); 47 final ObservableSetMock set = new ObservableSetMock(); 48 final Object removedElement = new Object(); 49 final SetChangeListener.Change<Object> change = new SetExpressionHelper.SimpleChange<Object>(set).setRemoved(removedElement); 50 51 // regular call 52 weakListener.onChanged(change); 53 listener.assertRemoved(MockSetObserver.Tuple.tup(removedElement)); 54 assertFalse(weakListener.wasGarbageCollected()); 55 56 // GC-ed call 57 set.reset(); 58 listener = null; 59 System.gc(); 60 assertTrue(weakListener.wasGarbageCollected()); 61 weakListener.onChanged(change); 62 assertEquals(1, set.removeCounter); 63 } 64 65 private static class ObservableSetMock extends ObservableSetWrapper<Object> { 66 private int removeCounter; 67 68 public ObservableSetMock() { 69 super(new HashSet<Object>()); 70 } 71 72 private void reset() { 73 removeCounter = 0; 74 } 75 76 @Override 77 public void removeListener(SetChangeListener<? super Object> listener) { 78 removeCounter++; 79 } 80 } 81 82 }