Mercurial > hg > blitz_condensed
annotate src/com/go/trove/io/FileByteBuffer.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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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.OutputStream; |
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56 import java.io.RandomAccessFile; |
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57 import java.io.IOException; |
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58 import java.util.List; |
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59 import java.util.ArrayList; |
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60 |
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61 /****************************************************************************** |
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62 * A ByteBuffer implementation that can read from an open file or can write |
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63 * to it. This implementation is best suited for temporary byte data that is |
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64 * too large to hold in memory. |
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65 * |
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66 * @author Brian S O'Neill |
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67 * @version |
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68 * <!--$$Revision: 1.1 $--> 5 <!-- $$JustDate:--> 00/12/05 <!-- $--> |
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69 */ |
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70 public class FileByteBuffer implements ByteBuffer { |
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71 private RandomAccessFile mFile; |
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72 private List mSurrogates; |
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73 private List mCaptureBuffers; |
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74 |
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75 /** |
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76 * Creates a FileByteBuffer on a RandomAccessFile. If the file is opened |
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77 * read-only, then the append operations will fail. |
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78 * |
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79 * @param file The file to use as a buffer. |
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80 */ |
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81 public FileByteBuffer(RandomAccessFile file) throws IOException { |
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82 mFile = file; |
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83 file.seek(0); |
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84 } |
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85 |
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86 public long getBaseByteCount() throws IOException { |
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87 return mFile.length(); |
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88 } |
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89 |
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90 public long getByteCount() throws IOException { |
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91 long count = getBaseByteCount(); |
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92 if (mSurrogates == null) { |
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93 return count; |
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94 } |
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95 |
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96 int size = mSurrogates.size(); |
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97 for (int i=0; i<size; i++) { |
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98 count += ((Surrogate)mSurrogates.get(i)).mByteData.getByteCount(); |
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99 } |
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100 |
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101 return count; |
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102 } |
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103 |
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104 public void writeTo(OutputStream out) throws IOException { |
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105 long length = mFile.length(); |
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106 int bufSize; |
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107 if (length > 4000) { |
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108 bufSize = 4000; |
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109 } |
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110 else { |
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111 bufSize = (int)length; |
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112 } |
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113 |
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114 byte[] inputBuffer = new byte[bufSize]; |
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115 |
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116 mFile.seek(0); |
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117 |
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118 if (mSurrogates != null) { |
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119 long currentPos = 0; |
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120 |
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121 int size = mSurrogates.size(); |
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122 for (int i=0; i<size; i++) { |
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123 Surrogate s = (Surrogate)mSurrogates.get(i); |
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124 currentPos = writeTo(inputBuffer, out, currentPos, s.mPos); |
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125 s.mByteData.writeTo(out); |
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126 } |
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127 } |
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128 |
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129 // Write out the rest of the file. |
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130 int readAmount; |
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131 while ((readAmount = mFile.read(inputBuffer, 0, bufSize)) > 0) { |
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132 out.write(inputBuffer, 0, readAmount); |
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133 } |
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134 } |
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135 |
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136 private long writeTo(byte[] inputBuffer, OutputStream out, |
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137 long fromPos, long toPos) throws IOException { |
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138 if (toPos == fromPos) { |
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139 return fromPos; |
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140 } |
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141 |
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142 int bufSize = inputBuffer.length; |
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143 int readAmount; |
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144 |
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145 while (toPos > fromPos) { |
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146 int amount; |
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147 if (bufSize <= (toPos - fromPos)) { |
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148 amount = bufSize; |
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149 } |
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150 else { |
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151 amount = (int)(toPos - fromPos); |
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152 } |
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153 |
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154 while ((readAmount = mFile.read(inputBuffer, 0, amount)) > 0) { |
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155 out.write(inputBuffer, 0, readAmount); |
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156 fromPos += readAmount; |
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157 amount -= readAmount; |
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158 if (amount <= 0) { |
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159 break; |
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160 } |
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161 } |
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162 |
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163 if (readAmount <= 0) { |
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164 break; |
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165 } |
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166 } |
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167 |
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168 return fromPos; |
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169 } |
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170 |
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171 public void append(byte b) throws IOException { |
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172 List captureBuffers; |
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173 if ((captureBuffers = mCaptureBuffers) != null) { |
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174 int size = captureBuffers.size(); |
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175 for (int i=0; i<size; i++) { |
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176 ((ByteBuffer)captureBuffers.get(i)).append(b); |
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177 } |
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178 } |
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179 |
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180 mFile.write(b); |
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181 } |
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182 |
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183 public void append(byte[] bytes) throws IOException { |
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184 mFile.write(bytes); |
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185 } |
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186 |
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187 public void append(byte[] bytes, int offset, int length) |
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188 throws IOException |
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189 { |
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190 List captureBuffers; |
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191 if ((captureBuffers = mCaptureBuffers) != null) { |
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192 int size = captureBuffers.size(); |
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193 for (int i=0; i<size; i++) { |
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194 ((ByteBuffer)captureBuffers.get(i)).append |
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195 (bytes, offset, length); |
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196 } |
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197 } |
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198 |
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199 mFile.write(bytes, offset, length); |
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200 } |
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201 |
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202 public void appendSurrogate(ByteData s) throws IOException { |
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203 if (s == null) { |
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204 return; |
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205 } |
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206 |
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207 List captureBuffers; |
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208 if ((captureBuffers = mCaptureBuffers) != null) { |
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209 int size = captureBuffers.size(); |
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210 for (int i=0; i<size; i++) { |
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211 ((ByteBuffer)captureBuffers.get(i)).appendSurrogate(s); |
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212 } |
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213 } |
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214 |
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215 if (mSurrogates == null) { |
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216 mSurrogates = new ArrayList(); |
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217 } |
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218 |
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219 mSurrogates.add(new Surrogate(s)); |
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220 } |
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221 |
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222 public void addCaptureBuffer(ByteBuffer buffer) { |
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223 List captureBuffers; |
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224 if ((captureBuffers = mCaptureBuffers) == null) { |
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225 captureBuffers = mCaptureBuffers = new ArrayList(); |
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226 } |
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227 captureBuffers.add(buffer); |
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228 } |
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229 |
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230 public void removeCaptureBuffer(ByteBuffer buffer) { |
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231 List captureBuffers; |
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232 if ((captureBuffers = mCaptureBuffers) != null) { |
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233 captureBuffers.remove(buffer); |
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234 } |
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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 List byteDatas; |
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239 int i, size; |
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240 |
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241 if ((byteDatas = mSurrogates) != null) { |
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242 size = byteDatas.size(); |
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243 for (i=0; i<size; i++) { |
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244 ((ByteData)byteDatas.get(i)).reset(); |
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245 } |
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246 } |
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247 |
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248 if ((byteDatas = mCaptureBuffers) != null) { |
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249 size = byteDatas.size(); |
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250 for (i=0; i<size; i++) { |
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251 ((ByteData)byteDatas.get(i)).reset(); |
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252 } |
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253 } |
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254 } |
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255 |
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256 private class Surrogate { |
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257 public final ByteData mByteData; |
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258 public final long mPos; |
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259 |
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260 public Surrogate(ByteData data) throws IOException { |
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261 mByteData = data; |
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262 mPos = mFile.getFilePointer(); |
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263 } |
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264 } |
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265 } |