1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   *
12   *
13   */
14  
15  package com.liferay.portal.kernel.memory;
16  
17  import com.liferay.portal.kernel.util.Validator;
18  
19  import java.lang.ref.ReferenceQueue;
20  import java.lang.ref.WeakReference;
21  
22  /**
23   * <a href="EqualityWeakReference.java.html"><b><i>View Source</i></b></a>
24   *
25   * @author Shuyang Zhou
26   */
27  public class EqualityWeakReference<T> extends WeakReference<T> {
28  
29      public EqualityWeakReference(T referent) {
30          super(referent);
31  
32          _hashCode = referent.hashCode();
33      }
34  
35      public EqualityWeakReference(
36          T referent, ReferenceQueue<? super T> referenceQueue) {
37  
38          super(referent, referenceQueue);
39  
40          _hashCode = referent.hashCode();
41      }
42  
43      public boolean equals(Object obj) {
44          if (this == obj) {
45              return true;
46          }
47  
48          if (!(obj instanceof EqualityWeakReference<?>)) {
49              return false;
50          }
51  
52          EqualityWeakReference<?> equalityWeakReference =
53              (EqualityWeakReference<?>)obj;
54  
55          if (Validator.equals(get(), equalityWeakReference.get())) {
56              return true;
57          }
58  
59          return false;
60      }
61  
62      public int hashCode() {
63          return _hashCode;
64      }
65  
66      private final int _hashCode;
67  
68  }