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annotate src/org/eclipse/jetty/io/BufferCache.java @ 898:39c12b2306a2
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| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Thu, 06 Oct 2016 23:57:43 -0600 |
| parents | 3ff59e08a1b7 |
| children | 74b9daf2826c |
| rev | line source |
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1 // |
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2 // ======================================================================== |
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
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4 // ------------------------------------------------------------------------ |
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5 // All rights reserved. This program and the accompanying materials |
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6 // are made available under the terms of the Eclipse Public License v1.0 |
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7 // and Apache License v2.0 which accompanies this distribution. |
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8 // |
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9 // The Eclipse Public License is available at |
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10 // http://www.eclipse.org/legal/epl-v10.html |
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11 // |
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12 // The Apache License v2.0 is available at |
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13 // http://www.opensource.org/licenses/apache2.0.php |
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14 // |
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15 // You may elect to redistribute this code under either of these licenses. |
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16 // ======================================================================== |
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17 // |
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18 |
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19 package org.eclipse.jetty.io; |
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20 |
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21 import java.util.ArrayList; |
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22 import java.util.HashMap; |
| 836 | 23 import java.util.Map; |
| 24 import java.util.TreeMap; | |
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25 |
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26 |
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27 /* ------------------------------------------------------------------------------- */ |
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28 /** |
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29 * Stores a collection of {@link Buffer} objects. |
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30 * Buffers are stored in an ordered collection and can retreived by index or value |
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31 * |
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32 */ |
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33 public class BufferCache |
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34 { |
| 836 | 35 private final HashMap _bufferMap=new HashMap(); |
| 36 private final TreeMap _stringMap = new TreeMap(); | |
| 37 private final ArrayList _index= new ArrayList(); | |
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38 |
| 836 | 39 /* ------------------------------------------------------------------------------- */ |
| 40 /** Add a buffer to the cache at the specified index. | |
| 41 * @param value The content of the buffer. | |
| 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.toLowerCase(), 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 } | |
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54 |
| 836 | 55 public CachedBuffer get(int ordinal) |
| 56 { | |
| 57 if (ordinal < 0 || ordinal >= _index.size()) | |
| 58 return null; | |
| 59 return (CachedBuffer)_index.get(ordinal); | |
| 60 } | |
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61 |
| 836 | 62 public CachedBuffer get(Buffer buffer) |
| 63 { | |
| 64 return (CachedBuffer)_bufferMap.get(buffer); | |
| 65 } | |
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66 |
| 836 | 67 public CachedBuffer get(String value) |
| 68 { | |
| 69 return (CachedBuffer)_stringMap.get(value.toLowerCase()); | |
| 70 } | |
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71 |
| 836 | 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 } | |
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84 |
| 836 | 85 return b; |
| 86 } | |
| 87 | |
| 88 public CachedBuffer getBest(byte[] value, int offset, int maxLength) | |
| 89 { | |
| 90 String key = new String(value,offset,maxLength).toLowerCase(); | |
| 91 CachedBuffer buffer = (CachedBuffer)_stringMap.get(key); | |
| 92 if( buffer != null ) | |
| 93 return buffer; | |
| 94 Map.Entry floor = _stringMap.floorEntry(key); | |
| 95 Map.Entry ceiling = _stringMap.ceilingEntry(key); | |
| 96 if( floor==null ) { | |
| 97 if( ceiling==null ) | |
| 98 return null; | |
| 99 String ceilingKey = (String)ceiling.getKey(); | |
| 100 return key.charAt(0) == ceilingKey.charAt(0) ? (CachedBuffer)ceiling.getValue() : null; | |
| 101 } else { | |
| 102 String floorKey = (String)floor.getKey(); | |
| 103 if( ceiling==null ) | |
| 104 return key.charAt(0) == floorKey.charAt(0) ? (CachedBuffer)floor.getValue() : null; | |
| 105 String ceilingKey = (String)ceiling.getKey(); | |
| 106 int n = Math.min( key.length(), Math.min( floorKey.length(), ceilingKey.length() ) ); | |
| 107 int i = 0; | |
| 108 while( ++i <= n && key.regionMatches(0,floorKey,0,i) && key.regionMatches(0,ceilingKey,0,i) ); | |
| 837 | 109 return key.regionMatches(0,floorKey,0,i) ? (CachedBuffer)floor.getValue() : key.regionMatches(0,ceilingKey,0,i) || i > 1 ? (CachedBuffer)ceiling.getValue() : null; |
| 836 | 110 } |
| 111 /* | |
| 112 Entry entry = _stringMap.getBestEntry(value, offset, maxLength); | |
| 113 if (entry!=null) | |
| 114 return (CachedBuffer)entry.getValue(); | |
| 115 return null; | |
| 116 */ | |
| 117 } | |
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118 |
| 836 | 119 public Buffer lookup(String value) |
| 120 { | |
| 121 Buffer b= get(value); | |
| 122 if (b == null) | |
| 123 { | |
| 124 return new CachedBuffer(value,-1); | |
| 125 } | |
| 126 return b; | |
| 127 } | |
| 128 | |
| 129 public String toString(Buffer buffer) | |
| 130 { | |
| 131 return lookup(buffer).toString(); | |
| 132 } | |
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133 |
| 836 | 134 public int getOrdinal(String value) |
| 135 { | |
| 136 CachedBuffer buffer = (CachedBuffer)_stringMap.get(value.toLowerCase()); | |
| 137 return buffer==null?-1:buffer.getOrdinal(); | |
| 138 } | |
| 139 | |
| 140 public int getOrdinal(Buffer buffer) | |
| 141 { | |
| 142 if (buffer instanceof CachedBuffer) | |
| 143 return ((CachedBuffer)buffer).getOrdinal(); | |
| 144 buffer=lookup(buffer); | |
| 145 if (buffer!=null && buffer instanceof CachedBuffer) | |
| 146 return ((CachedBuffer)buffer).getOrdinal(); | |
| 147 return -1; | |
| 148 } | |
| 149 | |
| 150 public static class CachedBuffer extends ByteArrayBuffer.CaseInsensitive | |
| 151 { | |
| 152 private final int _ordinal; | |
| 153 private HashMap _associateMap=null; | |
| 154 | |
| 155 public CachedBuffer(String value, int ordinal) | |
| 156 { | |
| 157 super(value); | |
| 158 _ordinal= ordinal; | |
| 159 } | |
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160 |
| 836 | 161 public int getOrdinal() |
| 162 { | |
| 163 return _ordinal; | |
| 164 } | |
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165 |
| 836 | 166 public CachedBuffer getAssociate(Object key) |
| 167 { | |
| 168 if (_associateMap==null) | |
| 169 return null; | |
| 170 return (CachedBuffer)_associateMap.get(key); | |
| 171 } | |
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172 |
| 836 | 173 // TODO Replace Associate with a mime encoding specific solution |
| 174 public void setAssociate(Object key, CachedBuffer associate) | |
| 175 { | |
| 176 if (_associateMap==null) | |
| 177 _associateMap=new HashMap(); | |
| 178 _associateMap.put(key,associate); | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 | |
| 183 @Override | |
| 184 public String toString() | |
| 185 { | |
| 186 return "CACHE["+ | |
| 187 "bufferMap="+_bufferMap+ | |
| 188 ",stringMap="+_stringMap+ | |
| 189 ",index="+_index+ | |
| 190 "]"; | |
| 191 } | |
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192 } |