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annotate src/org/eclipse/jetty/io/Buffer.java @ 955:6f49b8dfffe6

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simplify SelectChannelEndPoint
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 13 Oct 2016 16:55:53 -0600
parents 3428c60d7cfc
children 2712133d5bce
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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 import java.io.IOException;
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22 import java.io.InputStream;
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23 import java.io.OutputStream;
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24 import java.nio.charset.Charset;
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25
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26
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27 /**
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28 * Byte Buffer interface.
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29 *
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30 * This is a byte buffer that is designed to work like a FIFO for bytes. Puts and Gets operate on different
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31 * pointers into the buffer and the valid _content of the buffer is always between the getIndex and the putIndex.
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32 *
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33 * This buffer interface is designed to be similar, but not dependent on the java.nio buffers, which may
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34 * be used to back an implementation of this Buffer. The main difference is that NIO buffer after a put have
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35 * their valid _content before the position and a flip is required to access that data.
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36 *
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37 * For this buffer it is always true that:
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38 * markValue <= getIndex <= putIndex <= capacity
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39 *
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40 *
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41 * @version 1.0
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42 */
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43 public interface Buffer extends Cloneable
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44 {
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45 public final static int
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46 IMMUTABLE=0, // neither indexes or contexts can be changed
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47 READONLY=1, // indexes may be changed, but not content
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48 READWRITE=2; // anything can be changed
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49 public final boolean VOLATILE=true; // The buffer may change outside of current scope.
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50 public final boolean NON_VOLATILE=false;
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51
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52 /**
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53 * Get the underlying array, if one exists.
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54 * @return a <code>byte[]</code> backing this buffer or null if none exists.
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55 */
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56 byte[] array();
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57
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58 /**
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59 *
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60 * @return a <code>byte[]</code> value of the bytes from the getIndex to the putIndex.
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61 */
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62 byte[] asArray();
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63
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64 /**
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65 * Get the underlying buffer. If this buffer wraps a backing buffer.
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66 * @return The root backing buffer or this if there is no backing buffer;
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67 */
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68 Buffer buffer();
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69
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70 /**
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71 *
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72 * @return a non volatile version of this <code>Buffer</code> value
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73 */
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74 Buffer asNonVolatileBuffer();
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75
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76 /**
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77 *
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78 * @return a readonly version of this <code>Buffer</code>.
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79 */
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80 Buffer asReadOnlyBuffer();
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81
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82 /**
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83 *
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84 * @return an immutable version of this <code>Buffer</code>.
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85 */
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86 Buffer asImmutableBuffer();
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87
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88 /**
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89 *
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90 * @return an immutable version of this <code>Buffer</code>.
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91 */
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92 Buffer asMutableBuffer();
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93
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94 /**
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95 *
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96 * The capacity of the buffer. This is the maximum putIndex that may be set.
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97 * @return an <code>int</code> value
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98 */
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99 int capacity();
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100
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101 /**
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102 * the space remaining in the buffer.
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103 * @return capacity - putIndex
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104 */
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105 int space();
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106
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107 /**
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108 * Clear the buffer. getIndex=0, putIndex=0.
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109 */
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110 void clear();
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111
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112 /**
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113 * Compact the buffer by discarding bytes before the postion (or mark if set).
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114 * Bytes from the getIndex (or mark) to the putIndex are moved to the beginning of
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115 * the buffer and the values adjusted accordingly.
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116 */
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117 void compact();
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118
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119 /**
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120 * Get the byte at the current getIndex and increment it.
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121 * @return The <code>byte</code> value from the current getIndex.
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122 */
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123 byte get();
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124
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125 /**
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126 * Get bytes from the current postion and put them into the passed byte array.
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127 * The getIndex is incremented by the number of bytes copied into the array.
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128 * @param b The byte array to fill.
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129 * @param offset Offset in the array.
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130 * @param length The max number of bytes to read.
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131 * @return The number of bytes actually read.
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132 */
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133 int get(byte[] b, int offset, int length);
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134
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135 /**
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136 *
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137 * @param length an <code>int</code> value
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138 * @return a <code>Buffer</code> value
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139 */
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140 Buffer get(int length);
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141
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142 /**
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143 * The index within the buffer that will next be read or written.
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144 * @return an <code>int</code> value >=0 <= putIndex()
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145 */
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146 int getIndex();
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147
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148 /**
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149 * @return true of putIndex > getIndex
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150 */
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151 boolean hasContent();
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152
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153 /**
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154 *
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155 * @return a <code>boolean</code> value true if case sensitive comparison on this buffer
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156 */
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157 boolean equalsIgnoreCase(Buffer buffer);
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158
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159
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160 /**
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161 *
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162 * @return a <code>boolean</code> value true if the buffer is immutable and that neither
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163 * the buffer contents nor the indexes may be changed.
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164 */
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165 boolean isImmutable();
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166
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167 /**
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168 *
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169 * @return a <code>boolean</code> value true if the buffer is readonly. The buffer indexes may
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170 * be modified, but the buffer contents may not. For example a View onto an immutable Buffer will be
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171 * read only.
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172 */
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173 boolean isReadOnly();
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174
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175 /**
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176 *
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177 * @return a <code>boolean</code> value true if the buffer contents may change
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178 * via alternate paths than this buffer. If the contents of this buffer are to be used outside of the
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179 * current context, then a copy must be made.
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180 */
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181 boolean isVolatile();
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182
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183 /**
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184 * The number of bytes from the getIndex to the putIndex
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185 * @return an <code>int</code> == putIndex()-getIndex()
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186 */
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187 int length();
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188
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189 /**
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190 * Set the mark to the current getIndex.
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191 */
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192 void mark();
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193
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194 /**
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195 * Set the mark relative to the current getIndex
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196 * @param offset an <code>int</code> value to add to the current getIndex to obtain the mark value.
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197 */
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198 void mark(int offset);
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199
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200 /**
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201 * The current index of the mark.
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202 * @return an <code>int</code> index in the buffer or -1 if the mark is not set.
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203 */
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204 int markIndex();
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205
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206 /**
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207 * Get the byte at the current getIndex without incrementing the getIndex.
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208 * @return The <code>byte</code> value from the current getIndex.
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209 */
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210 byte peek();
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211
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212 /**
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213 * Get the byte at a specific index in the buffer.
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214 * @param index an <code>int</code> value
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215 * @return a <code>byte</code> value
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216 */
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217 byte peek(int index);
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218
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219 /**
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220 *
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221 * @param index an <code>int</code> value
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222 * @param length an <code>int</code> value
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223 * @return The <code>Buffer</code> value from the requested getIndex.
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224 */
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225 Buffer peek(int index, int length);
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226
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227 /**
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228 *
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229 * @param index an <code>int</code> value
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230 * @param b The byte array to peek into
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231 * @param offset The offset into the array to start peeking
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232 * @param length an <code>int</code> value
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233 * @return The number of bytes actually peeked
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234 */
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235 int peek(int index, byte[] b, int offset, int length);
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236
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237 /**
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238 * Put the contents of the buffer at the specific index.
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239 * @param index an <code>int</code> value
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240 * @param src a <code>Buffer</code>. If the source buffer is not modified
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241
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242 * @return The number of bytes actually poked
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243 */
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244 int poke(int index, Buffer src);
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245
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246 /**
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247 * Put a specific byte to a specific getIndex.
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248 * @param index an <code>int</code> value
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249 * @param b a <code>byte</code> value
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250 */
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251 void poke(int index, byte b);
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252
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253 /**
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254 * Put a specific byte to a specific getIndex.
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255 * @param index an <code>int</code> value
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256 * @param b a <code>byte array</code> value
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257 * @return The number of bytes actually poked
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258 */
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259 int poke(int index, byte b[], int offset, int length);
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260
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261 /**
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262 * Write the bytes from the source buffer to the current getIndex.
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263 * @param src The source <code>Buffer</code> it is not modified.
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264 * @return The number of bytes actually poked
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265 */
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266 int put(Buffer src);
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267
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268 /**
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269 * Put a byte to the current getIndex and increment the getIndex.
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270 * @param b a <code>byte</code> value
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271 */
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272 void put(byte b);
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273
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274 /**
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275 * Put a byte to the current getIndex and increment the getIndex.
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276 * @param b a <code>byte</code> value
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277 * @return The number of bytes actually poked
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278 */
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279 int put(byte[] b,int offset, int length);
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280
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281 /**
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282 * Put a byte to the current getIndex and increment the getIndex.
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283 * @param b a <code>byte</code> value
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284 * @return The number of bytes actually poked
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285 */
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286 int put(byte[] b);
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287
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288 /**
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289 * The index of the first element that should not be read.
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290 * @return an <code>int</code> value >= getIndex()
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291 */
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292 int putIndex();
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293
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294 /**
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295 * Reset the current getIndex to the mark
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296 */
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297 void reset();
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298
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299 /**
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300 * Set the buffers start getIndex.
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301 * @param newStart an <code>int</code> value
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302 */
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303 void setGetIndex(int newStart);
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304
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305 /**
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306 * Set a specific value for the mark.
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307 * @param newMark an <code>int</code> value
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308 */
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309 void setMarkIndex(int newMark);
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310
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311 /**
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312 *
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313 * @param newLimit an <code>int</code> value
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314 */
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315 void setPutIndex(int newLimit);
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316
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317 /**
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318 * Skip _content. The getIndex is updated by min(remaining(), n)
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319 * @param n The number of bytes to skip
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320 * @return the number of bytes skipped.
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321 */
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322 int skip(int n);
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323
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324 /**
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325 *
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326 * @return a volitile <code>Buffer</code> from the postion to the putIndex.
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327 */
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328 Buffer slice();
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329
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330 /**
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331 *
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332 *
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333 * @return a volitile <code>Buffer</code> value from the mark to the putIndex
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334 */
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335 Buffer sliceFromMark();
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336
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337 /**
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338 *
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339 *
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340 * @param length an <code>int</code> value
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341 * @return a valitile <code>Buffer</code> value from the mark of the length requested.
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342 */
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343 Buffer sliceFromMark(int length);
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344
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345 /**
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346 *
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347 * @return a <code>String</code> value describing the state and contents of the buffer.
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348 */
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349 String toDetailString();
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350
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351 /* ------------------------------------------------------------ */
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352 /** Write the buffer's contents to the output stream
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353 * @param out
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354 */
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355 void writeTo(OutputStream out) throws IOException;
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356
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357 /* ------------------------------------------------------------ */
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358 /** Read the buffer's contents from the input stream
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359 * @param in input stream
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360 * @param max maximum number of bytes that may be read
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361 * @return actual number of bytes read or -1 for EOF
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362 */
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363 int readFrom(InputStream in, int max) throws IOException;
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364
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365
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366 /* ------------------------------------------------------------ */
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367 String toString(String charset);
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368
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369 /* ------------------------------------------------------------ */
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370 String toString(Charset charset);
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371
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372 /*
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373 * Buffers implementing this interface should be compared with case insensitive equals
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374 *
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375 */
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376 public interface CaseInsensitve
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377 {}
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378
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379
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380 }