EvalutationReference


1   /*******************************************************************************
2    * Copyright (c) 2006 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   ******************************************************************************/
11  
12  package org.eclipse.ui.internal.navigator.extensions;
13  
14  import java.lang.ref.SoftReference  ;
15  
16  /**
17   * @since 3.3
18   * 
19   */
20  public class EvalutationReference extends SoftReference   {
21  
22      private final int hashCode;
23  
24      private final Class   type;
25  
26      /**
27       * @param referent
28       *            The object to be referenced
29       */
30      public EvalutationReference(Object   referent) {
31          super(referent);
32          hashCode = referent.hashCode();
33          type = referent.getClass();
34      }
35  
36      /*
37       * (non-Javadoc)
38       * 
39       * @see java.lang.Object#hashCode()
40       */
41      public int hashCode() {
42          return hashCode;
43      }
44  
45      /*
46       * (non-Javadoc)
47       * 
48       * @see java.lang.Object#equals(java.lang.Object)
49       */
50      public boolean equals(Object   obj) {
51          if (obj == null)
52              return false;
53          else if (obj instanceof EvalutationReference) {
54              if (!type.equals(((EvalutationReference) obj).type))
55                  return false;
56              return hashCode == obj.hashCode();
57          }
58          return false;
59      }
60      
61      /* (non-Javadoc)
62       * @see java.lang.Object#toString()
63       */
64      public String   toString() {
65          Object   referent = get();
66          if(referent == null)
67              return "Evalutation[type="+ type +"]";  //$NON-NLS-1$//$NON-NLS-2$
68          return "Evalutation[referent="+ referent +"]"; //$NON-NLS-1$ //$NON-NLS-2$
69      }
70  
71  }
72
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