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annotate src/org/eclipse/jetty/io/View.java @ 889:5731a7707466

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 06 Oct 2016 23:24:30 -0600
parents 3428c60d7cfc
children 0e96ce3db20a
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.io;
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20
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21 /**
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22 * A View on another buffer. Allows operations that do not change the _content or
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23 * indexes of the backing buffer.
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24 *
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25 *
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26 *
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27 */
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28 public class View extends AbstractBuffer
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29 {
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30 Buffer _buffer;
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31
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32 /**
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33 * @param buffer The <code>Buffer</code> on which we are presenting a <code>View</code>.
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34 * @param mark The initial value of the {@link Buffer#markIndex mark index}
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35 * @param get The initial value of the {@link Buffer#getIndex get index}
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36 * @param put The initial value of the {@link Buffer#putIndex put index}
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37 * @param access The access level - one of the constants from {@link Buffer}.
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38 */
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39 public View(Buffer buffer, int mark, int get, int put,int access)
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40 {
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41 super(READWRITE,!buffer.isImmutable());
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42 _buffer=buffer.buffer();
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43 setPutIndex(put);
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44 setGetIndex(get);
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45 setMarkIndex(mark);
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46 _access=access;
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47 }
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48
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49 public View(Buffer buffer)
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50 {
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51 super(READWRITE,!buffer.isImmutable());
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52 _buffer=buffer.buffer();
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53 setPutIndex(buffer.putIndex());
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54 setGetIndex(buffer.getIndex());
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55 setMarkIndex(buffer.markIndex());
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56 _access=buffer.isReadOnly()?READONLY:READWRITE;
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57 }
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58
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59 public View()
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60 {
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61 super(READWRITE,true);
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62 }
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63
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64 /**
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65 * Update view to buffer
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66 */
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67 public void update(Buffer buffer)
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68 {
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69 _access=READWRITE;
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70 _buffer=buffer.buffer();
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71 setGetIndex(0);
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72 setPutIndex(buffer.putIndex());
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73 setGetIndex(buffer.getIndex());
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74 setMarkIndex(buffer.markIndex());
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75 _access=buffer.isReadOnly()?READONLY:READWRITE;
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76 }
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77
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78 public void update(int get, int put)
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79 {
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80 int a=_access;
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81 _access=READWRITE;
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82 setGetIndex(0);
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83 setPutIndex(put);
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84 setGetIndex(get);
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85 setMarkIndex(-1);
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86 _access=a;
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87 }
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88
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89 /**
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90 * @return The {@link Buffer#array()} from the underlying buffer.
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91 */
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92 public byte[] array()
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93 {
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94 return _buffer.array();
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95 }
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96
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97 /**
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98 * @return The {@link Buffer#buffer()} from the underlying buffer.
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99 */
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100 @Override
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101 public Buffer buffer()
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102 {
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103 return _buffer.buffer();
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104 }
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105
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106 /**
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107 * @return The {@link Buffer#capacity} of the underlying buffer.
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108 */
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109 public int capacity()
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110 {
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111 return _buffer.capacity();
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112 }
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113
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114 /**
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115 *
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116 */
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117 @Override
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118 public void clear()
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119 {
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120 setMarkIndex(-1);
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121 setGetIndex(0);
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122 setPutIndex(_buffer.getIndex());
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123 setGetIndex(_buffer.getIndex());
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124 }
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125
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126 /**
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127 *
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128 */
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129 @Override
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130 public void compact()
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131 {
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132 // TODO
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133 }
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134
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135 /*
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136 * (non-Javadoc)
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137 *
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138 * @see java.lang.Object#equals(java.lang.Object)
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139 */
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140 @Override
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141 public boolean equals(Object obj)
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142 {
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143 return this==obj ||((obj instanceof Buffer)&& obj.equals(this)) || super.equals(obj);
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144 }
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145
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146 /**
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147 * @return Whether the underlying buffer is {@link Buffer#isReadOnly read only}
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148 */
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149 @Override
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150 public boolean isReadOnly()
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151 {
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152 return _buffer.isReadOnly();
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153 }
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154
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155 /**
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156 * @return Whether the underlying buffer is {@link Buffer#isVolatile volatile}
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157 */
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158 @Override
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159 public boolean isVolatile()
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160 {
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161 return true;
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162 }
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163
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164 /**
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165 * @return The result of calling {@link Buffer#peek(int)} on the underlying buffer
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166 */
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167 public byte peek(int index)
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168 {
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169 return _buffer.peek(index);
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170 }
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171
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172 /**
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173 * @return The result of calling {@link Buffer#peek(int, byte[], int, int)} on the underlying buffer
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174 */
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175 public int peek(int index, byte[] b, int offset, int length)
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176 {
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177 return _buffer.peek(index,b,offset,length);
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178 }
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179
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180 /**
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181 * @return The result of calling {@link Buffer#peek(int, int)} on the underlying buffer
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182 */
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183 @Override
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184 public Buffer peek(int index, int length)
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185 {
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186 return _buffer.peek(index, length);
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187 }
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188
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189 /**
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190 * @param index
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191 * @param src
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192 */
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193 @Override
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194 public int poke(int index, Buffer src)
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195 {
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196 return _buffer.poke(index,src);
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197 }
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198
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199 /**
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200 * @param index
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201 * @param b
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202 */
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203 public void poke(int index, byte b)
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204 {
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205 _buffer.poke(index,b);
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206 }
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207
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208 /**
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209 * @param index
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210 * @param b
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211 * @param offset
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212 * @param length
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213 */
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214 @Override
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215 public int poke(int index, byte[] b, int offset, int length)
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216 {
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217 return _buffer.poke(index,b,offset,length);
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218 }
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219
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220 @Override
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221 public String toString()
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222 {
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223 if (_buffer==null)
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224 return "INVALID";
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225 return super.toString();
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226 }
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227
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228 public static class CaseInsensitive extends View implements Buffer.CaseInsensitve
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229 {
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230 public CaseInsensitive()
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231 {
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232 super();
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233 }
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234
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235 public CaseInsensitive(Buffer buffer, int mark, int get, int put, int access)
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236 {
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237 super(buffer,mark,get,put,access);
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238 }
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239
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240 public CaseInsensitive(Buffer buffer)
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241 {
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242 super(buffer);
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243 }
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244
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245 @Override
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246 public boolean equals(Object obj)
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247 {
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248 return this==obj ||((obj instanceof Buffer)&&((Buffer)obj).equalsIgnoreCase(this)) || super.equals(obj);
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249 }
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250 }
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251 }