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1 package com.tirsen.nanning.samples.prevayler;
2
3 import java.io.Externalizable  ;
4 import java.io.IOException ;
5 import java.io.ObjectInput ;
6 import java.io.ObjectOutput ;
7 import java.util.*;
8
9 import org.apache.commons.collections.ReferenceMap;
10
11 public class SoftMap extends ReferenceMap implements Externalizable {
12 static final long serialVersionUID = -7396446944555084132L;
13
14
15 private transient List readBackValues;
16 private boolean valuesAreSoft;
17
18
19 public static SoftMap createSoftValuesMap() {
20 return new SoftMap();
21 }
22
23 public static SoftMap createSoftKeysMap() {
24 return new SoftMap(false);
25 }
26
27
30 public SoftMap() {
31 this(true);
32 }
33
34 public SoftMap(SoftMap map) {
35 this.valuesAreSoft = map.valuesAreSoft;
36 for (Iterator i = map.entrySet().iterator(); i.hasNext();) {
37 Map.Entry entry = (Map.Entry) i.next();
38 put(entry.getKey(), entry.getValue());
39 }
40 }
41
42 private SoftMap(boolean valuesAreSoft) {
43 super(valuesAreSoft ? HARD : SOFT, valuesAreSoft ? SOFT : HARD);
44 this.valuesAreSoft = valuesAreSoft;
45 }
46
47 public void clear() {
48 buildMap();
49 super.clear();
50 }
51
52 public boolean containsKey(Object key) {
53 buildMap();
54 return super.containsKey(key);
55 }
56
57 public Set entrySet() {
58 buildMap();
59 return super.entrySet();
60 }
61
62 public Object get(Object key) {
63 buildMap();
64 return super.get(key);
65 }
66
67 public boolean isEmpty() {
68 buildMap();
69 return super.isEmpty();
70 }
71
72 public Set keySet() {
73 buildMap();
74 return super.keySet();
75 }
76
77 public Object put(Object key, Object value) {
78 buildMap();
79 return super.put(key, value);
80 }
81
82 public Object remove(Object key) {
83 buildMap();
84 return super.remove(key);
85 }
86
87 public int size() {
88 buildMap();
89 return super.size();
90 }
91
92 public Collection values() {
93 buildMap();
94 return super.values();
95 }
96
97 protected Object clone() throws CloneNotSupportedException {
98 buildMap();
99 return super.clone();
100 }
101
102 public boolean containsValue(Object value) {
103 buildMap();
104 return super.containsValue(value);
105 }
106
107 public boolean equals(Object o) {
108 buildMap();
109 return super.equals(o);
110 }
111
112 public int hashCode() {
113 buildMap();
114 return super.hashCode();
115 }
116
117 public void putAll(Map t) {
118 buildMap();
119 super.putAll(t);
120 }
121
122 public String toString() {
123 buildMap();
124 return super.toString();
125 }
126
127
130 private synchronized void buildMap() {
131 if (readBackValues != null) {
132 List values = readBackValues;
133 readBackValues = null;
134 for (Iterator i = values.iterator(); i.hasNext();) {
135 Object key = i.next();
136 Object value = i.next();
137 put(key, value);
138 }
139 }
140 }
141
142 public void writeExternal(ObjectOutput out) throws IOException {
143 Set keys = keySet();
144 out.writeInt(keys.size());
145
146 for (Iterator i = keys.iterator(); i.hasNext();) {
147 Object key = i.next();
148 Object value = get(key);
149 out.writeObject(key);
150 out.writeObject(value);
151 }
152 }
153
154 public void readExternal(ObjectInput in) throws IOException , ClassNotFoundException {
155 int num = in.readInt();
156 readBackValues = new ArrayList(num * 2);
157
158 for (int i = 0; i < num; i++) {
159 Object key = in.readObject();
160 assert key != null;
161 Object value = in.readObject();
162 assert value != null;
163
164 readBackValues.add(key);
165 readBackValues.add(value);
166 }
167 }
168 }
169
170 |
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