Mercurial > hg > blitz_stable
annotate src/com/go/trove/io/InternedCharToByteBuffer.java @ 27:511648fa4d64 Version 2.1
Version to 2.1
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Mon, 04 Jan 2010 13:00:40 +0000 |
parents | 3dc0c5604566 |
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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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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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137 } |
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138 |
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139 public void append(byte b) throws IOException { |
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140 mBuffer.append(b); |
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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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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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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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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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159 } |
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160 |
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161 public void removeCaptureBuffer(ByteBuffer buffer) throws IOException { |
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162 mBuffer.removeCaptureBuffer(buffer); |
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163 } |
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164 |
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165 public void append(char c) throws IOException { |
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166 mBuffer.append(c); |
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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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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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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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181 if ((cache = getConvertedCache(str)) == null) { |
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182 mBuffer.append(str); |
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183 return; |
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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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201 if (enc != null) { |
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202 bytes = str.getBytes(enc); |
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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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206 bytes = str.getBytes(); |
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207 } |
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208 cache.put(str, bytes); |
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209 } |
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210 |
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211 mBuffer.append(bytes); |
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212 } |
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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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216 if (mRandom == null) { |
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217 mRandom = getRandom(); |
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218 } |
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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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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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223 // IdentityMap because no objects are created. A consequence of |
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224 // this optimization is that it will take more iterations to |
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225 // discover the real string literals, but they will be |
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226 // discovered eventually. |
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227 cache.put(str, MARKER); |
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228 } |
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229 mBuffer.append(str); |
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230 } |
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231 } |
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232 |
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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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235 } |
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236 |
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237 public void reset() throws IOException { |
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238 mBuffer.reset(); |
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239 } |
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240 |
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241 public void drain() throws IOException { |
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242 mBuffer.drain(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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243 } |
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244 |
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245 private Map getConvertedCache(String str) { |
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246 if (str.length() < MIN_LENGTH) { |
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247 return null; |
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248 } |
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249 return mConvertedCaches[str.charAt(1) % CACHES_PER_ENCODING]; |
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250 } |
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251 |
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252 private void readObject(ObjectInputStream in) |
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253 throws IOException, ClassNotFoundException |
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254 { |
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255 in.defaultReadObject(); |
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256 mConvertedCaches = getConvertedCaches(mBuffer.getEncoding()); |
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257 } |
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258 } |