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1
4 package com.tc.objectserver.persistence.impl;
5
6 import com.tc.io.serializer.api.StringIndex;
7 import com.tc.objectserver.persistence.api.StringIndexPersistor;
8
9 import gnu.trove.TLongObjectHashMap;
10 import gnu.trove.TLongObjectIterator;
11 import gnu.trove.TObjectLongHashMap;
12
13 public class StringIndexImpl implements StringIndex {
14 private static final int NULL = 0;
15 private final StringIndexPersistor persistor;
16 private final TLongObjectHashMap indexToString;
17 private final TObjectLongHashMap stringToIndex;
18 private long counter;
19
20 public StringIndexImpl(StringIndexPersistor persistor) {
21 this(persistor, 10);
22 }
23
24 public StringIndexImpl(StringIndexPersistor persistor, int initialCapacity) {
25 this.persistor = persistor;
26
27 this.indexToString = new TLongObjectHashMap(initialCapacity);
28 this.stringToIndex = new TObjectLongHashMap(initialCapacity);
29
30 for (TLongObjectIterator i = persistor.loadMappingsInto(indexToString).iterator(); i.hasNext();) {
31 i.advance();
32 long index = i.key();
33 if (index > counter) counter = index;
34 this.stringToIndex.put(i.value(), index);
35 }
36 }
37
38 public synchronized long getOrCreateIndexFor(String  string) {
39 if (string == null) return NULL;
40 long rv = stringToIndex.get(string);
41 if (rv < 1) {
42 rv = ++counter;
43 indexToString.put(rv, string);
44 stringToIndex.put(string, rv);
45 persistor.saveMapping(rv, string);
46 }
47 return rv;
48 }
49
50 public synchronized String getStringFor(long index) {
51 if (index == NULL) return null;
52 String rv = (String ) indexToString.get(index);
53 if (rv == null) throw new AssertionError ("Unknown index: " + index);
54 return rv;
55 }
56
57 public synchronized String toString() {
58 StringBuffer rv = new StringBuffer ();
59 rv.append("[");
60 for (TLongObjectIterator i = indexToString.iterator(); i.hasNext();) {
61 i.advance();
62 rv.append(i.key() + "=>" + i.value());
63 if (i.hasNext()) rv.append(", ");
64 }
65 rv.append("]");
66 return rv.toString();
67 }
68
69 public TObjectLongHashMap getString2LongMappings() {
71 return stringToIndex;
72 }
73
74 }
75 |
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