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14 package org.eclipse.jetty.io;
15
16 import java.util.ArrayList;
17 import java.util.HashMap;
18 import java.util.Map.Entry;
19
20 import org.eclipse.jetty.util.StringMap;
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27
28 public class BufferCache
29 {
30 private final HashMap _bufferMap=new HashMap();
31 private final StringMap _stringMap=new StringMap(StringMap.CASE_INSENSTIVE);
32 private final ArrayList _index= new ArrayList();
33
34
35
36
37
38 public CachedBuffer add(String value, int ordinal)
39 {
40 CachedBuffer buffer= new CachedBuffer(value, ordinal);
41 _bufferMap.put(buffer, buffer);
42 _stringMap.put(value, buffer);
43 while ((ordinal - _index.size()) >= 0)
44 _index.add(null);
45 if (_index.get(ordinal)==null)
46 _index.add(ordinal, buffer);
47 return buffer;
48 }
49
50 public CachedBuffer get(int ordinal)
51 {
52 if (ordinal < 0 || ordinal >= _index.size())
53 return null;
54 return (CachedBuffer)_index.get(ordinal);
55 }
56
57 public CachedBuffer get(Buffer buffer)
58 {
59 return (CachedBuffer)_bufferMap.get(buffer);
60 }
61
62 public CachedBuffer get(String value)
63 {
64 return (CachedBuffer)_stringMap.get(value);
65 }
66
67 public Buffer lookup(Buffer buffer)
68 {
69 if (buffer instanceof CachedBuffer)
70 return buffer;
71
72 Buffer b= get(buffer);
73 if (b == null)
74 {
75 if (buffer instanceof Buffer.CaseInsensitve)
76 return buffer;
77 return new ByteArrayBuffer.CaseInsensitive(buffer.asArray(),0,buffer.length(),Buffer.IMMUTABLE);
78 }
79
80 return b;
81 }
82
83 public CachedBuffer getBest(byte[] value, int offset, int maxLength)
84 {
85 Entry entry = _stringMap.getBestEntry(value, offset, maxLength);
86 if (entry!=null)
87 return (CachedBuffer)entry.getValue();
88 return null;
89 }
90
91 public Buffer lookup(String value)
92 {
93 Buffer b= get(value);
94 if (b == null)
95 {
96 return new CachedBuffer(value,-1);
97 }
98 return b;
99 }
100
101 public String toString(Buffer buffer)
102 {
103 return lookup(buffer).toString();
104 }
105
106 public int getOrdinal(Buffer buffer)
107 {
108 if (buffer instanceof CachedBuffer)
109 return ((CachedBuffer)buffer).getOrdinal();
110 buffer=lookup(buffer);
111 if (buffer!=null && buffer instanceof CachedBuffer)
112 return ((CachedBuffer)buffer).getOrdinal();
113 return -1;
114 }
115
116 public static class CachedBuffer extends ByteArrayBuffer.CaseInsensitive
117 {
118 private final int _ordinal;
119 private HashMap _associateMap=null;
120
121 public CachedBuffer(String value, int ordinal)
122 {
123 super(value);
124 _ordinal= ordinal;
125 }
126
127 public int getOrdinal()
128 {
129 return _ordinal;
130 }
131
132 public CachedBuffer getAssociate(Object key)
133 {
134 if (_associateMap==null)
135 return null;
136 return (CachedBuffer)_associateMap.get(key);
137 }
138
139
140 public void setAssociate(Object key, CachedBuffer associate)
141 {
142 if (_associateMap==null)
143 _associateMap=new HashMap();
144 _associateMap.put(key,associate);
145 }
146 }
147
148
149 @Override
150 public String toString()
151 {
152 return "CACHE["+
153 "bufferMap="+_bufferMap+
154 ",stringMap="+_stringMap+
155 ",index="+_index+
156 "]";
157 }
158 }