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19 package org.eclipse.jetty.io;
20
21 import java.util.ArrayList;
22 import java.util.HashMap;
23 import java.util.Map.Entry;
24
25 import org.eclipse.jetty.util.StringMap;
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32
33 public class BufferCache
34 {
35 private final HashMap _bufferMap=new HashMap();
36 private final StringMap _stringMap=new StringMap(StringMap.CASE_INSENSTIVE);
37 private final ArrayList _index= new ArrayList();
38
39
40
41
42
43 public CachedBuffer add(String value, int ordinal)
44 {
45 CachedBuffer buffer= new CachedBuffer(value, ordinal);
46 _bufferMap.put(buffer, buffer);
47 _stringMap.put(value, buffer);
48 while ((ordinal - _index.size()) >= 0)
49 _index.add(null);
50 if (_index.get(ordinal)==null)
51 _index.add(ordinal, buffer);
52 return buffer;
53 }
54
55 public CachedBuffer get(int ordinal)
56 {
57 if (ordinal < 0 || ordinal >= _index.size())
58 return null;
59 return (CachedBuffer)_index.get(ordinal);
60 }
61
62 public CachedBuffer get(Buffer buffer)
63 {
64 return (CachedBuffer)_bufferMap.get(buffer);
65 }
66
67 public CachedBuffer get(String value)
68 {
69 return (CachedBuffer)_stringMap.get(value);
70 }
71
72 public Buffer lookup(Buffer buffer)
73 {
74 if (buffer instanceof CachedBuffer)
75 return buffer;
76
77 Buffer b= get(buffer);
78 if (b == null)
79 {
80 if (buffer instanceof Buffer.CaseInsensitve)
81 return buffer;
82 return new ByteArrayBuffer.CaseInsensitive(buffer.asArray(),0,buffer.length(),Buffer.IMMUTABLE);
83 }
84
85 return b;
86 }
87
88 public CachedBuffer getBest(byte[] value, int offset, int maxLength)
89 {
90 Entry entry = _stringMap.getBestEntry(value, offset, maxLength);
91 if (entry!=null)
92 return (CachedBuffer)entry.getValue();
93 return null;
94 }
95
96 public Buffer lookup(String value)
97 {
98 Buffer b= get(value);
99 if (b == null)
100 {
101 return new CachedBuffer(value,-1);
102 }
103 return b;
104 }
105
106 public String toString(Buffer buffer)
107 {
108 return lookup(buffer).toString();
109 }
110
111 public int getOrdinal(String value)
112 {
113 CachedBuffer buffer = (CachedBuffer)_stringMap.get(value);
114 return buffer==null?-1:buffer.getOrdinal();
115 }
116
117 public int getOrdinal(Buffer buffer)
118 {
119 if (buffer instanceof CachedBuffer)
120 return ((CachedBuffer)buffer).getOrdinal();
121 buffer=lookup(buffer);
122 if (buffer!=null && buffer instanceof CachedBuffer)
123 return ((CachedBuffer)buffer).getOrdinal();
124 return -1;
125 }
126
127 public static class CachedBuffer extends ByteArrayBuffer.CaseInsensitive
128 {
129 private final int _ordinal;
130 private HashMap _associateMap=null;
131
132 public CachedBuffer(String value, int ordinal)
133 {
134 super(value);
135 _ordinal= ordinal;
136 }
137
138 public int getOrdinal()
139 {
140 return _ordinal;
141 }
142
143 public CachedBuffer getAssociate(Object key)
144 {
145 if (_associateMap==null)
146 return null;
147 return (CachedBuffer)_associateMap.get(key);
148 }
149
150
151 public void setAssociate(Object key, CachedBuffer associate)
152 {
153 if (_associateMap==null)
154 _associateMap=new HashMap();
155 _associateMap.put(key,associate);
156 }
157 }
158
159
160 @Override
161 public String toString()
162 {
163 return "CACHE["+
164 "bufferMap="+_bufferMap+
165 ",stringMap="+_stringMap+
166 ",index="+_index+
167 "]";
168 }
169 }