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 import static org.junit.Assert.assertEquals;
  29 import static org.junit.Assert.assertFalse;
  30 import static org.junit.Assert.assertTrue;
  31 import javafx.beans.value.ChangeListener;
  32 import javafx.beans.value.ObservableValue;
  33 
  34 import org.junit.Test;
  35 
  36 public class WeakInvalidationListenerTest {
  37         
  38     @Test(expected=NullPointerException.class)
  39     public void testConstructWithNull() {
  40         new WeakInvalidationListener(null);
  41     }
  42 
  43     @Test
  44     public void testHandle() {
  45         InvalidationListenerMock listener = new InvalidationListenerMock();
  46         final WeakInvalidationListener weakListener = new WeakInvalidationListener(listener);
  47         final ObservableMock o = new ObservableMock();
  48 
  49         // regular call
  50         weakListener.invalidated(o);
  51         listener.check(o, 1);
  52         assertFalse(weakListener.wasGarbageCollected());
  53 
  54         // GC-ed call
  55         o.reset();
  56         listener = null;
  57         System.gc();
  58         assertTrue(weakListener.wasGarbageCollected());
  59         weakListener.invalidated(o);
  60         assertEquals(1, o.removeCounter);
  61     }
  62 
  63     private static class ObservableMock implements ObservableValue<Object> {
  64         private int removeCounter;
  65 
  66         private void reset() {
  67             removeCounter = 0;
  68         }
  69 
  70         @Override
  71         public Object getValue() {
  72             return null;
  73         }
  74 
  75                 @Override
  76                 public void addListener(InvalidationListener listener) {
  77                         // not used
  78                 }
  79 
  80                 @Override
  81                 public void addListener(ChangeListener<? super Object> listener) {
  82                         // not used
  83                 }
  84 
  85                 @Override
  86                 public void removeListener(InvalidationListener listener) {
  87             removeCounter++;
  88                 }
  89 
  90                 @Override
  91                 public void removeListener(ChangeListener<? super Object> listener) {
  92                         // not used
  93                 }
  94 
  95     }
  96 
  97 }