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.MapExpressionHelper;
  29 import com.sun.javafx.collections.ObservableMapWrapper;
  30 import org.junit.Test;
  31 
  32 import java.util.HashMap;
  33 import javafx.collections.MapChangeListener;
  34 import javafx.collections.WeakMapChangeListener;
  35 
  36 import static org.junit.Assert.*;
  37 
  38 public class WeakMapChangeListenerTest {
  39         
  40     @Test(expected=NullPointerException.class)
  41     public void testConstructWithNull() {
  42         new WeakMapChangeListener<Object, Object>(null);
  43     }
  44 
  45     @Test
  46     public void testHandle() {
  47         MockMapObserver<Object, Object> listener = new MockMapObserver<Object, Object>();
  48         final WeakMapChangeListener<Object, Object> weakListener = new WeakMapChangeListener<Object, Object>(listener);
  49         final ObservableMapMock map = new ObservableMapMock();
  50         final Object key = new Object();
  51         final Object value = new Object();
  52         final MapChangeListener.Change<Object, Object> change = new MapExpressionHelper.SimpleChange<Object, Object>(map).setRemoved(key, value);
  53 
  54         // regular call
  55         weakListener.onChanged(change);
  56         listener.assertRemoved(MockMapObserver.Tuple.tup(key, value));
  57         assertFalse(weakListener.wasGarbageCollected());
  58 
  59         // GC-ed call
  60         map.reset();
  61         listener = null;
  62         System.gc();
  63         assertTrue(weakListener.wasGarbageCollected());
  64         weakListener.onChanged(change);
  65         assertEquals(1, map.removeCounter);
  66     }
  67 
  68     private static class ObservableMapMock extends ObservableMapWrapper<Object, Object> {
  69         private int removeCounter;
  70 
  71         public ObservableMapMock() {
  72             super(new HashMap<Object, Object>());
  73         }
  74 
  75         private void reset() {
  76             removeCounter = 0;
  77         }
  78 
  79         @Override
  80                 public void removeListener(MapChangeListener<? super Object, ? super Object> listener) {
  81             removeCounter++;
  82                 }
  83     }
  84 
  85 }