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Java > Open Source Codes > org > jboss > axis > utils > IDKey


1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 2001-2003 The Apache Software Foundation. All rights
6  * reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
18  * distribution.
19  *
20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
22  * "This product includes software developed by the
23  * Apache Software Foundation (http://www.apache.org/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
26  *
27  * 4. The names "Axis" and "Apache Software Foundation" must
28  * not be used to endorse or promote products derived from this
29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
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32  * 5. Products derived from this software may not be called "Apache",
33  * nor may "Apache" appear in their name, without prior written
34  * permission of the Apache Software Foundation.
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36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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48  * ====================================================================
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50  * This software consists of voluntary contributions made by many
51  * individuals on behalf of the Apache Software Foundation. For more
52  * information on the Apache Software Foundation, please see
53  * <http://www.apache.org/>.
54  */
55
56 package org.jboss.axis.utils;
57
58 /**
59  * Wrap an identity key (System.identityHashCode())
60  */
61 public class IDKey
62 {
63    private Object JavaDoc value = null;
64    private int id = 0;
65
66    /**
67     * Constructor for IDKey
68     *
69     * @param _value
70     */
71    public IDKey(Object JavaDoc _value)
72    {
73       // This is the Object hashcode
74 id = System.identityHashCode(_value);
75       // There have been some cases (bug 11706) that return the
76 // same identity hash code for different objects. So
77 // the value is also added to disambiguate these cases.
78 value = _value;
79    }
80
81    /**
82     * returns hashcode
83     *
84     * @return
85     */
86    public int hashCode()
87    {
88       return id;
89    }
90
91    /**
92     * checks if instances are equal
93     *
94     * @param other
95     * @return
96     */
97    public boolean equals(Object JavaDoc other)
98    {
99       if (!(other instanceof IDKey))
100       {
101          return false;
102       }
103       IDKey idKey = (IDKey)other;
104       if (id != idKey.id)
105       {
106          return false;
107       }
108       // Note that identity equals is used.
109 return value == idKey.value;
110    }
111 }
112
113
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