IdentityHashMap


1   /**
2    * Created by IntelliJ IDEA.
3    * User: srida01
4    * Date: Dec 2, 2002
5    * Time: 10:38:46 AM
6    * To change this template use Options | File Templates.
7    */
8   package org.apache.axis.utils;
9   
10  import java.util.HashMap  ;
11  import java.util.Map  ;
12  
13  /**
14   * IdentityHashMap similar to JDK1.4's java.util.IdentityHashMap
15   * @author Davanum Srinivas <dims@yahoo.com>
16   */
17  public class IdentityHashMap extends HashMap  
18  {
19      /**
20       * Constructor for IdentityHashMap.
21       * @param initialCapacity
22       * @param loadFactor
23       */
24      public IdentityHashMap(int initialCapacity, float loadFactor)
25      {
26          super(initialCapacity, loadFactor);
27      }
28  
29      /**
30       * Constructor for IdentityHashMap.
31       * @param initialCapacity
32       */
33      public IdentityHashMap(int initialCapacity)
34      {
35          super(initialCapacity);
36      }
37  
38      /**
39       * Constructor for IdentityHashMap.
40       */
41      public IdentityHashMap()
42      {
43          super();
44      }
45  
46      /**
47       * Constructor for IdentityHashMap.
48       * @param t
49       */
50      public IdentityHashMap(Map   t)
51      {
52          super(t);
53      }
54  
55      /**
56       * @see Map#get(Object)
57       */
58      public Object   get(Object   key)
59      {
60          return super.get(new IDKey(key));
61      }
62  
63      /**
64       * @see Map#put(Object, Object)
65       */
66      public Object   put(Object   key, Object   value)
67      {
68          return super.put(new IDKey(key), value);
69      }
70  
71      /**
72       * adds an object to the Map. new Identity(obj) is used as key
73       */
74      public Object   add(Object   value)
75      {
76          Object   key = new IDKey(value);
77          if (! super.containsKey(key))
78          {
79              return super.put(key, value);
80          }
81          else return null;
82  
83      }
84  
85      /**
86       * @see Map#remove(Object)
87       */
88      public Object   remove(Object   key)
89      {
90          return super.remove(new IDKey(key));
91      }
92  
93      /**
94       * @see Map#containsKey(Object)
95       */
96      public boolean containsKey(Object   key)
97      {
98          return super.containsKey(new IDKey(key));
99      }
100 }
101
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