Mercurial > hg > blitz_stable
annotate src/com/go/trove/io/SpilloverByteBuffer.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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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.IOException; |
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57 import java.util.List; |
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58 import java.util.ArrayList; |
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59 |
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60 /****************************************************************************** |
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61 * A ByteBuffer implementation that initially stores its data in a |
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62 * DefaultByteBuffer, but after a certain threshold is reached, spills over |
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63 * into a FileByteBuffer. |
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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:--> 00/12/05 <!-- $--> |
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68 */ |
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69 public class SpilloverByteBuffer implements ByteBuffer { |
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70 private Group mGroup; |
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71 |
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72 private ByteBuffer mLocalBuffer; |
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73 private ByteBuffer mSpillover; |
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74 |
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75 private List mCaptureBuffers; |
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76 |
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77 /** |
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78 * Create a SpilloverByteBuffer against a Group that sets the threshold |
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79 * and can create a spillover FileByteBuffer. The Group can be shared |
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80 * among many SpilloverByteBuffers. |
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81 * |
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82 * @param group a group that can be shared among many SpilloverByteBuffers |
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83 */ |
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84 public SpilloverByteBuffer(Group group) { |
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85 mGroup = group; |
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86 mLocalBuffer = new DefaultByteBuffer(); |
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87 } |
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88 |
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89 public long getBaseByteCount() throws IOException { |
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90 if (mSpillover == null) { |
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91 return mLocalBuffer.getBaseByteCount(); |
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92 } |
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93 else { |
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94 return mSpillover.getBaseByteCount(); |
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95 } |
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96 } |
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97 |
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98 public long getByteCount() throws IOException { |
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99 if (mSpillover == null) { |
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100 return mLocalBuffer.getByteCount(); |
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101 } |
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102 else { |
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103 return mSpillover.getByteCount(); |
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104 } |
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105 } |
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106 |
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107 public void writeTo(OutputStream out) throws IOException { |
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108 if (mSpillover == null) { |
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109 mLocalBuffer.writeTo(out); |
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110 } |
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111 else { |
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112 mSpillover.writeTo(out); |
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113 } |
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114 } |
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115 |
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116 public void append(byte b) throws IOException { |
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117 List captureBuffers; |
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118 if ((captureBuffers = mCaptureBuffers) != null) { |
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119 int size = captureBuffers.size(); |
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120 for (int i=0; i<size; i++) { |
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121 ((ByteBuffer)captureBuffers.get(i)).append(b); |
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122 } |
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123 } |
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124 |
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125 if (mSpillover == null) { |
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126 if (mGroup.adjustLevel(1)) { |
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127 mLocalBuffer.append(b); |
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128 return; |
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129 } |
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130 spillover(); |
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131 } |
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132 |
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133 mSpillover.append(b); |
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134 } |
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135 |
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136 public void append(byte[] bytes) throws IOException { |
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137 append(bytes, 0, bytes.length); |
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138 } |
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139 |
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140 public void append(byte[] bytes, int offset, int length) |
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141 throws IOException |
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142 { |
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143 List captureBuffers; |
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144 if ((captureBuffers = mCaptureBuffers) != null) { |
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145 int size = captureBuffers.size(); |
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146 for (int i=0; i<size; i++) { |
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147 ((ByteBuffer)captureBuffers.get(i)).append |
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148 (bytes, offset, length); |
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149 } |
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150 } |
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151 |
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152 if (mSpillover == null) { |
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153 if (mGroup.adjustLevel(length)) { |
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154 mLocalBuffer.append(bytes, offset, length); |
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155 return; |
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156 } |
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157 spillover(); |
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158 } |
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159 |
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160 mSpillover.append(bytes, offset, length); |
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161 } |
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162 |
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163 public void appendSurrogate(ByteData s) throws IOException { |
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164 if (s == null) { |
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165 return; |
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166 } |
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167 |
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168 List captureBuffers; |
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169 if ((captureBuffers = mCaptureBuffers) != null) { |
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170 int size = captureBuffers.size(); |
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171 for (int i=0; i<size; i++) { |
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172 ((ByteBuffer)captureBuffers.get(i)).appendSurrogate(s); |
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173 } |
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174 } |
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175 |
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176 if (mSpillover == null) { |
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177 mLocalBuffer.appendSurrogate(s); |
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178 } |
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179 else { |
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180 mSpillover.appendSurrogate(s); |
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181 } |
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182 } |
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183 |
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184 public void addCaptureBuffer(ByteBuffer buffer) { |
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185 List captureBuffers; |
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186 if ((captureBuffers = mCaptureBuffers) == null) { |
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187 captureBuffers = mCaptureBuffers = new ArrayList(); |
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188 } |
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189 captureBuffers.add(buffer); |
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190 } |
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191 |
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192 public void removeCaptureBuffer(ByteBuffer buffer) { |
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193 List captureBuffers; |
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194 if ((captureBuffers = mCaptureBuffers) != null) { |
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195 captureBuffers.remove(buffer); |
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196 } |
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197 } |
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198 |
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199 public void reset() throws IOException { |
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200 mLocalBuffer.reset(); |
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201 if (mSpillover != null) { |
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202 mSpillover.reset(); |
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203 } |
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204 |
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205 List captureBuffers; |
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206 if ((captureBuffers = mCaptureBuffers) != null) { |
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207 int size = captureBuffers.size(); |
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208 for (int i=0; i<size; i++) { |
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209 ((ByteData)captureBuffers.get(i)).reset(); |
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210 } |
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211 } |
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212 } |
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213 |
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214 protected void finalize() throws IOException { |
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215 if (mLocalBuffer != null) { |
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216 long count = mLocalBuffer.getBaseByteCount(); |
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217 mLocalBuffer = null; |
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218 mGroup.adjustLevel(-count); |
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219 } |
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220 } |
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221 |
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222 private void spillover() throws IOException { |
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223 mSpillover = mGroup.createFileByteBuffer(); |
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224 // TODO: This is bad! By writing out the contents of the existing |
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225 // buffer early, surrogates are evaluated too soon! |
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226 mLocalBuffer.writeTo(new ByteBufferOutputStream(mSpillover)); |
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227 |
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228 long count = mLocalBuffer.getBaseByteCount(); |
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229 mLocalBuffer = null; |
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230 mGroup.adjustLevel(-count); |
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231 } |
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232 |
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233 public static abstract class Group { |
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234 private final long mThreshold; |
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235 private long mLevel; |
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236 |
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237 public Group(long threshold) { |
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238 mThreshold = threshold; |
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239 } |
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240 |
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241 public final long getThreshold() { |
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242 return mThreshold; |
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243 } |
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244 |
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245 public final synchronized long getCurrentLevel() { |
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246 return mLevel; |
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247 } |
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248 |
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249 public abstract FileByteBuffer createFileByteBuffer() |
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250 throws IOException; |
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251 |
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252 synchronized boolean adjustLevel(long delta) { |
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253 long newLevel; |
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254 if ((newLevel = mLevel + delta) > mThreshold) { |
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255 return false; |
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256 } |
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257 else { |
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258 if (newLevel < 0) { |
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259 newLevel = 0; |
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260 } |
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261 mLevel = newLevel; |
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262 return true; |
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263 } |
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264 } |
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265 } |
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266 } |