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Java > Open Source Codes > com > go > trove > util > AbstractMapEntry


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52
53 package com.go.trove.util;
54
55 import java.util.*;
56
57 /******************************************************************************
58  * Abstract Map.Entry implementation that makes it easier to define new Map
59  * entries.
60  *
61  * @author Brian S O'Neill
62  * @version
63  * <!--$$Revision:--> 13 <!-- $-->, <!--$$JustDate:--> 1/23/01 <!-- $-->
64  */
65 public abstract class AbstractMapEntry implements Map.Entry {
66     /**
67      * Always throws UnsupportedOperationException.
68      */
69     public Object JavaDoc setValue(Object JavaDoc value) {
70         throw new UnsupportedOperationException JavaDoc();
71     }
72
73     public boolean equals(Object JavaDoc obj) {
74         if (!(obj instanceof Map.Entry)) {
75             return false;
76         }
77         
78         Map.Entry e = (Map.Entry)obj;
79         
80         Object JavaDoc key = getKey();
81         Object JavaDoc value = getValue();
82         
83         return
84             (key == null ?
85              e.getKey() == null : key.equals(e.getKey())) &&
86             (value == null ?
87              e.getValue() == null : value.equals(e.getValue()));
88     }
89     
90     public int hashCode() {
91         Object JavaDoc key = getKey();
92         Object JavaDoc value = getValue();
93         
94         return
95             (key == null ? 0 : key.hashCode()) ^
96             (value == null ? 0 : value.hashCode());
97     }
98
99     public String JavaDoc toString() {
100         return String.valueOf(getKey()) + '=' + String.valueOf(getValue());
101     }
102 }
103
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