Mercurial > hg > blitz_condensed
annotate src/com/go/trove/io/DefaultCharToByteBuffer.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.*; |
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56 |
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57 /****************************************************************************** |
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58 * A CharToByteBuffer implementation that wraps a ByteBuffer for storage. |
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59 * |
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60 * @author Brian S O'Neill |
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61 * @version |
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62 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/05/30 <!-- $--> |
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63 */ |
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64 public class DefaultCharToByteBuffer |
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65 implements CharToByteBuffer, Serializable |
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66 { |
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67 private ByteBuffer mBuffer; |
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68 private transient OutputStreamWriter mConvertor; |
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69 |
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70 private char[] mChars; |
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71 private int mCapacity; |
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72 private int mCursor; |
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73 |
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74 private String mDefaultEncoding; |
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75 |
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76 /** |
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77 * @param buffer Buffer that receives the characters converted to bytes. |
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78 */ |
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79 public DefaultCharToByteBuffer(ByteBuffer buffer) { |
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80 this(buffer, null); |
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81 } |
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82 |
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83 /** |
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84 * @param buffer Buffer that receives the characters converted to bytes. |
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85 * @param defaultEncoding Default character encoding to use if setEncoding |
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86 * is not called. |
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87 */ |
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88 public DefaultCharToByteBuffer(ByteBuffer buffer, String defaultEncoding) { |
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89 mBuffer = buffer; |
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90 mChars = new char[4000]; |
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91 mCapacity = mChars.length; |
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92 mDefaultEncoding = defaultEncoding; |
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93 } |
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94 |
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95 public void setEncoding(String enc) throws IOException { |
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96 drain(true); |
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97 mConvertor = new OutputStreamWriter |
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98 (new ByteBufferOutputStream(mBuffer), enc); |
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99 } |
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100 |
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101 public String getEncoding() { |
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102 return (mConvertor == null) ? mDefaultEncoding : |
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103 mConvertor.getEncoding(); |
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104 } |
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105 |
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106 public long getBaseByteCount() throws IOException { |
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107 return mBuffer.getBaseByteCount(); |
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108 } |
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109 |
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110 public long getByteCount() throws IOException { |
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111 drain(true); |
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112 return mBuffer.getByteCount(); |
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113 } |
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114 |
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115 public void writeTo(OutputStream out) throws IOException { |
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116 drain(true); |
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117 mBuffer.writeTo(out); |
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118 } |
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119 |
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120 public void append(byte b) throws IOException { |
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121 drain(true); |
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122 mBuffer.append(b); |
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123 } |
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124 |
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125 public void append(byte[] bytes) throws IOException { |
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126 append(bytes, 0, bytes.length); |
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127 } |
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128 |
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129 public void append(byte[] bytes, int offset, int length) |
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130 throws IOException { |
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131 |
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132 if (length != 0) { |
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133 drain(true); |
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134 mBuffer.append(bytes, offset, length); |
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135 } |
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136 } |
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137 |
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138 public void appendSurrogate(ByteData s) throws IOException { |
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139 if (s != null) { |
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140 drain(true); |
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141 mBuffer.appendSurrogate(s); |
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142 } |
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143 } |
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144 |
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145 public void addCaptureBuffer(ByteBuffer buffer) throws IOException { |
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146 drain(true); |
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147 mBuffer.addCaptureBuffer(buffer); |
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148 } |
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149 |
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150 public void removeCaptureBuffer(ByteBuffer buffer) throws IOException { |
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151 drain(true); |
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152 mBuffer.removeCaptureBuffer(buffer); |
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153 } |
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154 |
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155 public void append(char c) throws IOException { |
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156 if (mCursor >= mCapacity) { |
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157 drain(false); |
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158 } |
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159 mChars[mCursor++] = c; |
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160 } |
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161 |
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162 public void append(char[] chars) throws IOException { |
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163 append(chars, 0, chars.length); |
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164 } |
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165 |
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166 public void append(char[] chars, int offset, int length) |
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167 throws IOException |
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168 { |
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169 if (length == 0) { |
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170 return; |
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171 } |
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172 |
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173 int capacity = mCapacity; |
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174 |
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175 if (length < (capacity - mCursor)) { |
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176 System.arraycopy(chars, offset, mChars, mCursor, length); |
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177 mCursor += length; |
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178 return; |
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179 } |
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180 |
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181 // Make room and try again. |
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182 drain(false); |
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183 |
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184 if (length < capacity) { |
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185 System.arraycopy(chars, offset, mChars, mCursor, length); |
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186 mCursor += length; |
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187 return; |
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188 } |
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189 |
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190 // Write the whole chunk out at once. |
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191 getConvertor().write(chars, offset, length); |
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192 } |
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193 |
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194 public void append(String str) throws IOException { |
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195 append(str, 0, str.length()); |
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196 } |
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197 |
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198 public void append(String str, int offset, int length) throws IOException { |
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199 if (length == 0) { |
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200 return; |
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201 } |
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202 |
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203 int capacity = mCapacity; |
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204 int avail = capacity - mCursor; |
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205 |
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206 if (length <= avail) { |
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207 str.getChars(offset, offset + length, mChars, mCursor); |
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208 mCursor += length; |
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209 return; |
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210 } |
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211 |
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212 // Fill up the rest of the character buffer and drain it. |
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213 str.getChars(offset, offset + avail, mChars, mCursor); |
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214 offset += avail; |
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215 length -= avail; |
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216 mCursor = capacity; |
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217 drain(false); |
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218 |
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219 // Drain chunks that completely fill the character buffer. |
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220 while (length >= capacity) { |
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221 str.getChars(offset, offset + capacity, mChars, 0); |
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222 offset += capacity; |
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223 length -= capacity; |
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224 mCursor = capacity; |
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225 drain(false); |
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226 } |
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227 |
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228 // Copy the remainder into the character buffer, but don't drain. |
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229 if (length > 0) { |
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230 str.getChars(offset, offset + length, mChars, 0); |
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231 mCursor = length; |
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232 } |
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233 } |
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234 |
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235 public void reset() throws IOException { |
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236 mBuffer.reset(); |
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237 } |
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238 |
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239 public void drain() throws IOException { |
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240 drain(true); |
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241 } |
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242 |
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243 private OutputStreamWriter getConvertor() |
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244 throws UnsupportedEncodingException |
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245 { |
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246 if (mConvertor == null) { |
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247 if (mDefaultEncoding == null) { |
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248 mConvertor = new OutputStreamWriter |
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249 (new ByteBufferOutputStream(mBuffer)); |
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250 } |
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251 else { |
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252 mConvertor = new OutputStreamWriter |
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253 (new ByteBufferOutputStream(mBuffer), mDefaultEncoding); |
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254 } |
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255 } |
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256 return mConvertor; |
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257 } |
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258 |
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259 private void drain(boolean flush) throws IOException { |
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260 if (mCursor != 0) { |
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261 try { |
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262 getConvertor().write(mChars, 0, mCursor); |
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263 } |
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264 finally { |
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265 mCursor = 0; |
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266 } |
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267 } |
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268 |
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269 if (flush && mConvertor != null) { |
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270 mConvertor.flush(); |
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271 } |
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272 } |
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273 |
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274 private void writeObject(ObjectOutputStream out) throws IOException { |
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275 out.defaultWriteObject(); |
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276 if (mConvertor == null) { |
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277 out.writeObject(null); |
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278 } |
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279 else { |
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280 out.writeObject(mConvertor.getEncoding()); |
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281 } |
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282 } |
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283 |
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284 private void readObject(ObjectInputStream in) |
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285 throws IOException, ClassNotFoundException |
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286 { |
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287 in.defaultReadObject(); |
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288 String enc = (String)in.readObject(); |
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289 if (enc != null) { |
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290 mConvertor = new OutputStreamWriter |
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291 (new ByteBufferOutputStream(mBuffer), enc); |
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292 } |
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293 } |
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294 } |