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1 package org.jboss.cache.util;
2
3 import java.io.IOException  ;
4 import java.io.Serializable ;
5 import java.util.AbstractMap ;
6 import java.util.AbstractSet ;
7 import java.util.Iterator ;
8 import java.util.Map ;
9 import java.util.Set ;
10
11
18 public class MapCopy<K, V> extends AbstractMap implements Serializable
19 {
20
21 private static final long serialVersionUID = -958813082188242956L;
22
23 private Map.Entry <K, V> data[];
24
25 private transient Set <Map.Entry <K, V>> entrySet;
26
27
30 public MapCopy(Map <K, V> m)
31 {
32 data = new Map.Entry [m.size()];
33 int i = 0;
34 for (Map.Entry <K, V> me : m.entrySet())
35 {
36 if (me == null)
37 throw new NullPointerException ();
38 data[i++] = new SimpleEntry<K, V>(me);
39 }
40 init();
41 }
42
43 private void init()
44 {
45 this.entrySet = new AbstractSet <Map.Entry <K, V>>()
46 {
47 public int size()
48 {
49 return data.length;
50 }
51
52 public Iterator <Map.Entry <K, V>> iterator()
53 {
54 return new EntryIterator();
55 }
56 };
57 }
58
59 private class EntryIterator implements Iterator <Entry<K, V>>
60 {
61 private int index;
62
63 public boolean hasNext()
64 {
65 return index < data.length;
66 }
67
68 public Entry<K, V> next()
69 {
70 return data[index++];
71 }
72
73 public void remove()
74 {
75 throw new UnsupportedOperationException ();
76 }
77 }
78
79
82 private static class SimpleEntry<K, V> implements Map.Entry <K, V>, Serializable
83 {
84 private static final long serialVersionUID = -6092752114794052323L;
85
86 private K key;
87
88 private V value;
89
90 public SimpleEntry(Entry<K, V> me)
91 {
92 key = me.getKey();
93 value = me.getValue();
94 }
95
96 public K getKey()
97 {
98 return key;
99 }
100
101 public V getValue()
102 {
103 return value;
104 }
105
106 public V setValue(V arg0)
107 {
108 throw new UnsupportedOperationException ();
109 }
110
111 @Override
112 public boolean equals(Object o)
113 {
114 Map.Entry e2 = (Map.Entry ) o;
115 return (getKey() == null ? e2.getKey() == null : getKey().equals(e2.getKey()))
116 && (getValue() == null ? e2.getValue() == null : getValue().equals(e2.getValue()));
117 }
118
119 @Override
120 public int hashCode()
121 {
122 return (getKey() == null ? 0 : getKey().hashCode()) ^
123 (getValue() == null ? 0 : getValue().hashCode());
124 }
125
126 @Override
127 public String toString()
128 {
129 return key + "=" + value;
130 }
131 }
132
133 @Override
134 public Set entrySet()
135 {
136 return entrySet;
137 }
138
139 @Override
140 public int size()
141 {
142 return data.length;
143 }
144
145 private void readObject(java.io.ObjectInputStream in) throws IOException , ClassNotFoundException
146 {
147 in.defaultReadObject();
148 init();
149 }
150
151 }
152 |
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