Mercurial > hg > blitz_stable

annotate src/com/go/trove/io/InternedCharToByteBuffer.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1999-2000 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.io;
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54
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55 import java.io.*;
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56 import java.util.*;
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57 import com.go.trove.util.IdentityMap;
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58
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59 /******************************************************************************
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60 * A CharToByteBuffer that keeps track of interned strings (mainly string
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61 * literals) and statically caches the results of those strings after applying
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62 * a byte conversion. This can improve performance if many of the strings being
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63 * passed to the append method have been converted before.
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64 *
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65 * @author Brian S O'Neill
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66 * @version
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67 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 7/31/01 <!-- $-->
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68 */
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69 public class InternedCharToByteBuffer
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70 implements CharToByteBuffer, Serializable
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71 {
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72 private static final int CACHES_PER_ENCODING = 11;
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73 private static final int MIN_LENGTH = 4;
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74
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75 private static final Object MARKER = new Object();
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76
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77 private static Map cEncodings = new HashMap(7);
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78
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79 private static Random cLastRandom = new Random();
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80
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81 /**
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82 * Returns several caches for the given encoding. A character in the
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83 * string key is used to select the correct cache. By breaking up the
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84 * cache in this way, the synchronization required to access the caches
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85 * is distributed.
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86 */
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87 private static Map[] getConvertedCaches(String encoding) {
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88 synchronized (cEncodings) {
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89 Map[] caches = (Map[])cEncodings.get(encoding);
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90 if (caches == null) {
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91 caches = new Map[CACHES_PER_ENCODING];
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92 for (int i=0; i<CACHES_PER_ENCODING; i++) {
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93 caches[i] = Collections.synchronizedMap(new IdentityMap());
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94 }
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95 cEncodings.put(encoding, caches);
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96 }
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97 return caches;
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98 }
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99 }
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100
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101 private static Random getRandom() {
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102 synchronized (cLastRandom) {
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103 return cLastRandom = new Random(cLastRandom.nextLong());
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104 }
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105 }
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106
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107 private CharToByteBuffer mBuffer;
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108 private Random mRandom;
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109 private transient Map[] mConvertedCaches;
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110
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111 public InternedCharToByteBuffer(CharToByteBuffer buffer)
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112 throws IOException
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113 {
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114 mBuffer = buffer;
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115 mConvertedCaches = getConvertedCaches(buffer.getEncoding());
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116 }
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117
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118 public void setEncoding(String enc) throws IOException {
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119 mBuffer.setEncoding(enc);
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120 mConvertedCaches = getConvertedCaches(mBuffer.getEncoding());
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121 }
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122
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123 public String getEncoding() throws IOException {
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124 return mBuffer.getEncoding();
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125 }
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126
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127 public long getBaseByteCount() throws IOException {
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128 return mBuffer.getBaseByteCount();
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129 }
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130
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131 public long getByteCount() throws IOException {
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132 return mBuffer.getByteCount();
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Dan Creswell <dan.creswell@gmail.com>
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133 }
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134
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135 public void writeTo(OutputStream out) throws IOException {
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136 mBuffer.writeTo(out);
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Dan Creswell <dan.creswell@gmail.com>
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137 }
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138
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Dan Creswell <dan.creswell@gmail.com>
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139 public void append(byte b) throws IOException {
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140 mBuffer.append(b);
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Dan Creswell <dan.creswell@gmail.com>
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141 }
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142
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143 public void append(byte[] bytes) throws IOException {
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144 mBuffer.append(bytes);
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Dan Creswell <dan.creswell@gmail.com>
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145 }
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146
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147 public void append(byte[] bytes, int offset, int length)
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148 throws IOException {
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149
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150 mBuffer.append(bytes, offset, length);
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Dan Creswell <dan.creswell@gmail.com>
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151 }
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152
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153 public void appendSurrogate(ByteData s) throws IOException {
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154 mBuffer.appendSurrogate(s);
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Dan Creswell <dan.creswell@gmail.com>
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155 }
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156
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157 public void addCaptureBuffer(ByteBuffer buffer) throws IOException {
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158 mBuffer.addCaptureBuffer(buffer);
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Dan Creswell <dan.creswell@gmail.com>
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159 }
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160
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Dan Creswell <dan.creswell@gmail.com>
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161 public void removeCaptureBuffer(ByteBuffer buffer) throws IOException {
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162 mBuffer.removeCaptureBuffer(buffer);
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Dan Creswell <dan.creswell@gmail.com>
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163 }
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164
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Dan Creswell <dan.creswell@gmail.com>
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165 public void append(char c) throws IOException {
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166 mBuffer.append(c);
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Dan Creswell <dan.creswell@gmail.com>
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167 }
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168
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169 public void append(char[] chars) throws IOException {
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170 mBuffer.append(chars);
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Dan Creswell <dan.creswell@gmail.com>
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171 }
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172
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173 public void append(char[] chars, int offset, int length)
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174 throws IOException {
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175
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176 mBuffer.append(chars, offset, length);
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Dan Creswell <dan.creswell@gmail.com>
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177 }
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178
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179 public void append(String str) throws IOException {
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180 Map cache;
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Dan Creswell <dan.creswell@gmail.com>
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181 if ((cache = getConvertedCache(str)) == null) {
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182 mBuffer.append(str);
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Dan Creswell <dan.creswell@gmail.com>
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183 return;
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Dan Creswell <dan.creswell@gmail.com>
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184 }
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185
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186 // Caching performed using a two pass technique. This is done to
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187 // avoid the cost of String.getBytes() for strings that aren't
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188 // actually interned.
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189
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190 Object value;
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191
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192 if ((value = cache.get(str)) != null) {
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193 byte[] bytes;
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194 if (value != MARKER) {
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195 bytes = (byte[])value;
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196 }
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197 else {
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198 // This is at least the second time the string has been seen,
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199 // so assume it has been interned and call String.getBytes().
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200 String enc = getEncoding();
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Dan Creswell <dan.creswell@gmail.com>
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201 if (enc != null) {
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Dan Creswell <dan.creswell@gmail.com>
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202 bytes = str.getBytes(enc);
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Dan Creswell <dan.creswell@gmail.com>
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203 }
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204 else {
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205 // no encoding specified so use default.
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
206 bytes = str.getBytes();
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Dan Creswell <dan.creswell@gmail.com>
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207 }
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208 cache.put(str, bytes);
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Dan Creswell <dan.creswell@gmail.com>
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209 }
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210
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211 mBuffer.append(bytes);
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Dan Creswell <dan.creswell@gmail.com>
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212 }
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Dan Creswell <dan.creswell@gmail.com>
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213 else {
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214 // Just put a marker at first to indicate that the string has been
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215 // seen, but don't call String.getBytes() just yet.
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Dan Creswell <dan.creswell@gmail.com>
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216 if (mRandom == null) {
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
217 mRandom = getRandom();
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
218 }
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
219 if ((mRandom.nextInt() % 20) == 0) {
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220 // Only mark sometimes in order to reduce the amount of times
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Dan Creswell <dan.creswell@gmail.com>
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221 // put is called for strings that will never be seen again.
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222 // Calculating a random number is cheaper than putting into an
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Dan Creswell <dan.creswell@gmail.com>
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223 // IdentityMap because no objects are created. A consequence of
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Dan Creswell <dan.creswell@gmail.com>
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224 // this optimization is that it will take more iterations to
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
225 // discover the real string literals, but they will be
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Dan Creswell <dan.creswell@gmail.com>
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226 // discovered eventually.
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Dan Creswell <dan.creswell@gmail.com>
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227 cache.put(str, MARKER);
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Dan Creswell <dan.creswell@gmail.com>
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228 }
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Dan Creswell <dan.creswell@gmail.com>
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229 mBuffer.append(str);
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Dan Creswell <dan.creswell@gmail.com>
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230 }
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Dan Creswell <dan.creswell@gmail.com>
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231 }
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Dan Creswell <dan.creswell@gmail.com>
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232
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
233 public void append(String str, int offset, int length) throws IOException {
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234 mBuffer.append(str, offset, length);
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Dan Creswell <dan.creswell@gmail.com>
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235 }
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Dan Creswell <dan.creswell@gmail.com>
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236
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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diff changeset
237 public void reset() throws IOException {
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
238 mBuffer.reset();
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Dan Creswell <dan.creswell@gmail.com>
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239 }
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Dan Creswell <dan.creswell@gmail.com>
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240
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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diff changeset
241 public void drain() throws IOException {
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
242 mBuffer.drain();
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Dan Creswell <dan.creswell@gmail.com>
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243 }
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244
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
245 private Map getConvertedCache(String str) {
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diff changeset
246 if (str.length() < MIN_LENGTH) {
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Dan Creswell <dan.creswell@gmail.com>
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247 return null;
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Dan Creswell <dan.creswell@gmail.com>
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248 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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diff changeset
249 return mConvertedCaches[str.charAt(1) % CACHES_PER_ENCODING];
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Dan Creswell <dan.creswell@gmail.com>
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250 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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251
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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diff changeset
252 private void readObject(ObjectInputStream in)
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
253 throws IOException, ClassNotFoundException
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
254 {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
255 in.defaultReadObject();
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
256 mConvertedCaches = getConvertedCaches(mBuffer.getEncoding());
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257 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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258 }