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 test.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 import javafx.collections.SetChangeListener; 34 import javafx.collections.WeakSetChangeListener; 35 36 import static org.junit.Assert.*; 37 38 public class WeakSetChangeListenerTest { 39 40 @Test(expected=NullPointerException.class) 41 public void testConstructWithNull() { 42 new WeakSetChangeListener<Object>(null); 43 } 44 45 @Test 46 public void testHandle() { 47 MockSetObserver<Object> listener = new MockSetObserver<Object>(); 48 final WeakSetChangeListener<Object> weakListener = new WeakSetChangeListener<Object>(listener); 49 final ObservableSetMock set = new ObservableSetMock(); 50 final Object removedElement = new Object(); 51 final SetChangeListener.Change<Object> change = new SetExpressionHelper.SimpleChange<Object>(set).setRemoved(removedElement); 52 53 // regular call 54 weakListener.onChanged(change); 55 listener.assertRemoved(MockSetObserver.Tuple.tup(removedElement)); 56 assertFalse(weakListener.wasGarbageCollected()); 57 58 // GC-ed call 59 set.reset(); 60 listener = null; 61 System.gc(); 62 assertTrue(weakListener.wasGarbageCollected()); 63 weakListener.onChanged(change); 64 assertEquals(1, set.removeCounter); 65 } 66 67 private static class ObservableSetMock extends ObservableSetWrapper<Object> { 68 private int removeCounter; 69 70 public ObservableSetMock() { 71 super(new HashSet<Object>()); 72 } 73 74 private void reset() { 75 removeCounter = 0; 76 } 77 78 @Override 79 public void removeListener(SetChangeListener<? super Object> listener) { 80 removeCounter++; 81 } 82 } 83 84 }