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89 | <H2> |
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90 | <FONT SIZE="-1"> |
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91 | org.apache.hadoop.io</FONT> |
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92 | <BR> |
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93 | Class WritableComparator</H2> |
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94 | <PRE> |
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95 | <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A> |
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96 | <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.io.WritableComparator</B> |
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97 | </PRE> |
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98 | <DL> |
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99 | <DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</A></DD> |
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100 | </DL> |
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101 | <DL> |
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102 | <DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/io/BooleanWritable.Comparator.html" title="class in org.apache.hadoop.io">BooleanWritable.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/BytesWritable.Comparator.html" title="class in org.apache.hadoop.io">BytesWritable.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/ByteWritable.Comparator.html" title="class in org.apache.hadoop.io">ByteWritable.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/DoubleWritable.Comparator.html" title="class in org.apache.hadoop.io">DoubleWritable.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/FloatWritable.Comparator.html" title="class in org.apache.hadoop.io">FloatWritable.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/IntWritable.Comparator.html" title="class in org.apache.hadoop.io">IntWritable.Comparator</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapred.lib">KeyFieldBasedComparator</A>, <A HREF="../../../../org/apache/hadoop/io/LongWritable.Comparator.html" title="class in org.apache.hadoop.io">LongWritable.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/MD5Hash.Comparator.html" title="class in org.apache.hadoop.io">MD5Hash.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/NullWritable.Comparator.html" title="class in org.apache.hadoop.io">NullWritable.Comparator</A>, <A HREF="../../../../org/apache/hadoop/record/RecordComparator.html" title="class in org.apache.hadoop.record">RecordComparator</A>, <A HREF="../../../../org/apache/hadoop/examples/SecondarySort.IntPair.Comparator.html" title="class in org.apache.hadoop.examples">SecondarySort.IntPair.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/Text.Comparator.html" title="class in org.apache.hadoop.io">Text.Comparator</A>, <A HREF="../../../../org/apache/hadoop/io/UTF8.Comparator.html" title="class in org.apache.hadoop.io">UTF8.Comparator</A></DD> |
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103 | </DL> |
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104 | <HR> |
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105 | <DL> |
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106 | <DT><PRE>public class <B>WritableComparator</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</A></DL> |
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107 | </PRE> |
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108 | |
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109 | <P> |
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110 | A Comparator for <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A>s. |
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111 | |
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112 | <p>This base implemenation uses the natural ordering. To define alternate |
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113 | orderings, override <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.WritableComparable)"><CODE>compare(WritableComparable,WritableComparable)</CODE></A>. |
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114 | |
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115 | <p>One may optimize compare-intensive operations by overriding |
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116 | <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(byte[], int, int, byte[], int, int)"><CODE>compare(byte[],int,int,byte[],int,int)</CODE></A>. Static utility methods are |
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117 | provided to assist in optimized implementations of this method. |
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118 | <P> |
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119 | |
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120 | <P> |
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121 | <HR> |
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122 | |
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123 | <P> |
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124 | |
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125 | <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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126 | |
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127 | <A NAME="constructor_summary"><!-- --></A> |
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128 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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129 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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130 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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131 | <B>Constructor Summary</B></FONT></TH> |
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132 | </TR> |
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133 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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134 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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135 | <CODE>protected </CODE></FONT></TD> |
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136 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#WritableComparator(java.lang.Class)">WritableComparator</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>> keyClass)</CODE> |
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137 | |
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138 | <BR> |
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139 | Construct for a <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> implementation.</TD> |
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140 | </TR> |
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141 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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142 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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143 | <CODE>protected </CODE></FONT></TD> |
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144 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#WritableComparator(java.lang.Class, boolean)">WritableComparator</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>> keyClass, |
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145 | boolean createInstances)</CODE> |
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146 | |
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147 | <BR> |
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148 | </TD> |
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149 | </TR> |
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150 | </TABLE> |
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151 | |
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152 | <!-- ========== METHOD SUMMARY =========== --> |
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153 | |
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154 | <A NAME="method_summary"><!-- --></A> |
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155 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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156 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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157 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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158 | <B>Method Summary</B></FONT></TH> |
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159 | </TR> |
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160 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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161 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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162 | <CODE> int</CODE></FONT></TD> |
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163 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></B>(byte[] b1, |
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164 | int s1, |
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165 | int l1, |
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166 | byte[] b2, |
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167 | int s2, |
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168 | int l2)</CODE> |
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169 | |
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170 | <BR> |
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171 | Optimization hook.</TD> |
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172 | </TR> |
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173 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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174 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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175 | <CODE> int</CODE></FONT></TD> |
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176 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(java.lang.Object, java.lang.Object)">compare</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> a, |
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177 | <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> b)</CODE> |
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178 | |
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179 | <BR> |
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180 | </TD> |
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181 | </TR> |
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182 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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183 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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184 | <CODE> int</CODE></FONT></TD> |
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185 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.WritableComparable)">compare</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> a, |
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186 | <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> b)</CODE> |
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187 | |
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188 | <BR> |
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189 | Compare two WritableComparables.</TD> |
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190 | </TR> |
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191 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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192 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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193 | <CODE>static int</CODE></FONT></TD> |
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194 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compareBytes(byte[], int, int, byte[], int, int)">compareBytes</A></B>(byte[] b1, |
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195 | int s1, |
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196 | int l1, |
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197 | byte[] b2, |
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198 | int s2, |
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199 | int l2)</CODE> |
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200 | |
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201 | <BR> |
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202 | Lexicographic order of binary data.</TD> |
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203 | </TR> |
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204 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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205 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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206 | <CODE>static void</CODE></FONT></TD> |
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207 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#define(java.lang.Class, org.apache.hadoop.io.WritableComparator)">define</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A> c, |
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208 | <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A> comparator)</CODE> |
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209 | |
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210 | <BR> |
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211 | Register an optimized comparator for a <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> |
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212 | implementation.</TD> |
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213 | </TR> |
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214 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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215 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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216 | <CODE>static <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A></CODE></FONT></TD> |
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217 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#get(java.lang.Class)">get</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>> c)</CODE> |
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218 | |
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219 | <BR> |
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220 | Get a comparator for a <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> implementation.</TD> |
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221 | </TR> |
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222 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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223 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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224 | <CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>></CODE></FONT></TD> |
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225 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#getKeyClass()">getKeyClass</A></B>()</CODE> |
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226 | |
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227 | <BR> |
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228 | Returns the WritableComparable implementation class.</TD> |
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229 | </TR> |
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230 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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231 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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232 | <CODE>static int</CODE></FONT></TD> |
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233 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#hashBytes(byte[], int)">hashBytes</A></B>(byte[] bytes, |
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234 | int length)</CODE> |
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235 | |
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236 | <BR> |
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237 | Compute hash for binary data.</TD> |
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238 | </TR> |
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239 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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240 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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241 | <CODE> <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A></CODE></FONT></TD> |
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242 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#newKey()">newKey</A></B>()</CODE> |
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243 | |
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244 | <BR> |
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245 | Construct a new <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> instance.</TD> |
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246 | </TR> |
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247 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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248 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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249 | <CODE>static double</CODE></FONT></TD> |
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250 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readDouble(byte[], int)">readDouble</A></B>(byte[] bytes, |
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251 | int start)</CODE> |
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252 | |
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253 | <BR> |
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254 | Parse a double from a byte array.</TD> |
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255 | </TR> |
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256 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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257 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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258 | <CODE>static float</CODE></FONT></TD> |
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259 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readFloat(byte[], int)">readFloat</A></B>(byte[] bytes, |
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260 | int start)</CODE> |
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261 | |
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262 | <BR> |
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263 | Parse a float from a byte array.</TD> |
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264 | </TR> |
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265 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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266 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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267 | <CODE>static int</CODE></FONT></TD> |
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268 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readInt(byte[], int)">readInt</A></B>(byte[] bytes, |
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269 | int start)</CODE> |
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270 | |
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271 | <BR> |
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272 | Parse an integer from a byte array.</TD> |
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273 | </TR> |
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274 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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275 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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276 | <CODE>static long</CODE></FONT></TD> |
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277 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readLong(byte[], int)">readLong</A></B>(byte[] bytes, |
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278 | int start)</CODE> |
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279 | |
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280 | <BR> |
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281 | Parse a long from a byte array.</TD> |
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282 | </TR> |
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283 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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284 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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285 | <CODE>static int</CODE></FONT></TD> |
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286 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readUnsignedShort(byte[], int)">readUnsignedShort</A></B>(byte[] bytes, |
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287 | int start)</CODE> |
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288 | |
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289 | <BR> |
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290 | Parse an unsigned short from a byte array.</TD> |
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291 | </TR> |
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292 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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293 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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294 | <CODE>static int</CODE></FONT></TD> |
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295 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readVInt(byte[], int)">readVInt</A></B>(byte[] bytes, |
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296 | int start)</CODE> |
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297 | |
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298 | <BR> |
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299 | Reads a zero-compressed encoded integer from a byte array and returns it.</TD> |
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300 | </TR> |
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301 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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302 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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303 | <CODE>static long</CODE></FONT></TD> |
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304 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readVLong(byte[], int)">readVLong</A></B>(byte[] bytes, |
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305 | int start)</CODE> |
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306 | |
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307 | <BR> |
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308 | Reads a zero-compressed encoded long from a byte array and returns it.</TD> |
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309 | </TR> |
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310 | </TABLE> |
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311 | <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> |
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312 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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313 | <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> |
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314 | <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH> |
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315 | </TR> |
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316 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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317 | <TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD> |
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318 | </TR> |
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319 | </TABLE> |
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320 | <A NAME="methods_inherited_from_class_java.util.Comparator"><!-- --></A> |
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321 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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322 | <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> |
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323 | <TH ALIGN="left"><B>Methods inherited from interface java.util.<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A></B></TH> |
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324 | </TR> |
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325 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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326 | <TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.util">equals</A></CODE></TD> |
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327 | </TR> |
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328 | </TABLE> |
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329 | |
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330 | <P> |
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331 | |
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332 | <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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333 | |
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334 | <A NAME="constructor_detail"><!-- --></A> |
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335 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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336 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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337 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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338 | <B>Constructor Detail</B></FONT></TH> |
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339 | </TR> |
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340 | </TABLE> |
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341 | |
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342 | <A NAME="WritableComparator(java.lang.Class)"><!-- --></A><H3> |
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343 | WritableComparator</H3> |
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344 | <PRE> |
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345 | protected <B>WritableComparator</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>> keyClass)</PRE> |
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346 | <DL> |
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347 | <DD>Construct for a <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> implementation. |
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348 | <P> |
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349 | </DL> |
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350 | <HR> |
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351 | |
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352 | <A NAME="WritableComparator(java.lang.Class, boolean)"><!-- --></A><H3> |
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353 | WritableComparator</H3> |
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354 | <PRE> |
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355 | protected <B>WritableComparator</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>> keyClass, |
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356 | boolean createInstances)</PRE> |
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357 | <DL> |
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358 | </DL> |
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359 | |
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360 | <!-- ============ METHOD DETAIL ========== --> |
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361 | |
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362 | <A NAME="method_detail"><!-- --></A> |
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363 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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364 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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365 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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366 | <B>Method Detail</B></FONT></TH> |
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367 | </TR> |
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368 | </TABLE> |
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369 | |
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370 | <A NAME="get(java.lang.Class)"><!-- --></A><H3> |
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371 | get</H3> |
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372 | <PRE> |
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373 | public static <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A> <B>get</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>> c)</PRE> |
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374 | <DL> |
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375 | <DD>Get a comparator for a <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> implementation. |
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376 | <P> |
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377 | <DD><DL> |
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378 | </DL> |
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379 | </DD> |
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380 | <DD><DL> |
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381 | </DL> |
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382 | </DD> |
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383 | </DL> |
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384 | <HR> |
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385 | |
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386 | <A NAME="define(java.lang.Class, org.apache.hadoop.io.WritableComparator)"><!-- --></A><H3> |
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387 | define</H3> |
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388 | <PRE> |
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389 | public static void <B>define</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A> c, |
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390 | <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A> comparator)</PRE> |
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391 | <DL> |
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392 | <DD>Register an optimized comparator for a <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> |
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393 | implementation. |
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394 | <P> |
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395 | <DD><DL> |
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396 | </DL> |
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397 | </DD> |
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398 | <DD><DL> |
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399 | </DL> |
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400 | </DD> |
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401 | </DL> |
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402 | <HR> |
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403 | |
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404 | <A NAME="getKeyClass()"><!-- --></A><H3> |
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405 | getKeyClass</H3> |
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406 | <PRE> |
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407 | public <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>> <B>getKeyClass</B>()</PRE> |
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408 | <DL> |
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409 | <DD>Returns the WritableComparable implementation class. |
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410 | <P> |
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411 | <DD><DL> |
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412 | </DL> |
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413 | </DD> |
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414 | <DD><DL> |
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415 | </DL> |
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416 | </DD> |
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417 | </DL> |
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418 | <HR> |
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419 | |
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420 | <A NAME="newKey()"><!-- --></A><H3> |
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421 | newKey</H3> |
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422 | <PRE> |
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423 | public <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> <B>newKey</B>()</PRE> |
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424 | <DL> |
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425 | <DD>Construct a new <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> instance. |
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426 | <P> |
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427 | <DD><DL> |
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428 | </DL> |
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429 | </DD> |
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430 | <DD><DL> |
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431 | </DL> |
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432 | </DD> |
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433 | </DL> |
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434 | <HR> |
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435 | |
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436 | <A NAME="compare(byte[], int, int, byte[], int, int)"><!-- --></A><H3> |
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437 | compare</H3> |
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438 | <PRE> |
---|
439 | public int <B>compare</B>(byte[] b1, |
---|
440 | int s1, |
---|
441 | int l1, |
---|
442 | byte[] b2, |
---|
443 | int s2, |
---|
444 | int l2)</PRE> |
---|
445 | <DL> |
---|
446 | <DD>Optimization hook. Override this to make SequenceFile.Sorter's scream. |
---|
447 | |
---|
448 | <p>The default implementation reads the data into two <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A>s (using <A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)"><CODE>Writable.readFields(DataInput)</CODE></A>, then calls <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.WritableComparable)"><CODE>compare(WritableComparable,WritableComparable)</CODE></A>. |
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449 | <P> |
---|
450 | <DD><DL> |
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451 | <DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/io/RawComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</A></CODE></DL> |
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452 | </DD> |
---|
453 | <DD><DL> |
---|
454 | </DL> |
---|
455 | </DD> |
---|
456 | </DL> |
---|
457 | <HR> |
---|
458 | |
---|
459 | <A NAME="compare(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.WritableComparable)"><!-- --></A><H3> |
---|
460 | compare</H3> |
---|
461 | <PRE> |
---|
462 | public int <B>compare</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> a, |
---|
463 | <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> b)</PRE> |
---|
464 | <DL> |
---|
465 | <DD>Compare two WritableComparables. |
---|
466 | |
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467 | <p> The default implementation uses the natural ordering, calling <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true#compareTo(T)" title="class or interface in java.lang"><CODE>Comparable.compareTo(Object)</CODE></A>. |
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468 | <P> |
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469 | <DD><DL> |
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470 | </DL> |
---|
471 | </DD> |
---|
472 | <DD><DL> |
---|
473 | </DL> |
---|
474 | </DD> |
---|
475 | </DL> |
---|
476 | <HR> |
---|
477 | |
---|
478 | <A NAME="compare(java.lang.Object, java.lang.Object)"><!-- --></A><H3> |
---|
479 | compare</H3> |
---|
480 | <PRE> |
---|
481 | public int <B>compare</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> a, |
---|
482 | <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> b)</PRE> |
---|
483 | <DL> |
---|
484 | <DD><DL> |
---|
485 | <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true#compare(T, T)" title="class or interface in java.util">compare</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A></CODE></DL> |
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486 | </DD> |
---|
487 | <DD><DL> |
---|
488 | </DL> |
---|
489 | </DD> |
---|
490 | </DL> |
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491 | <HR> |
---|
492 | |
---|
493 | <A NAME="compareBytes(byte[], int, int, byte[], int, int)"><!-- --></A><H3> |
---|
494 | compareBytes</H3> |
---|
495 | <PRE> |
---|
496 | public static int <B>compareBytes</B>(byte[] b1, |
---|
497 | int s1, |
---|
498 | int l1, |
---|
499 | byte[] b2, |
---|
500 | int s2, |
---|
501 | int l2)</PRE> |
---|
502 | <DL> |
---|
503 | <DD>Lexicographic order of binary data. |
---|
504 | <P> |
---|
505 | <DD><DL> |
---|
506 | </DL> |
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507 | </DD> |
---|
508 | <DD><DL> |
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509 | </DL> |
---|
510 | </DD> |
---|
511 | </DL> |
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512 | <HR> |
---|
513 | |
---|
514 | <A NAME="hashBytes(byte[], int)"><!-- --></A><H3> |
---|
515 | hashBytes</H3> |
---|
516 | <PRE> |
---|
517 | public static int <B>hashBytes</B>(byte[] bytes, |
---|
518 | int length)</PRE> |
---|
519 | <DL> |
---|
520 | <DD>Compute hash for binary data. |
---|
521 | <P> |
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522 | <DD><DL> |
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523 | </DL> |
---|
524 | </DD> |
---|
525 | <DD><DL> |
---|
526 | </DL> |
---|
527 | </DD> |
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528 | </DL> |
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529 | <HR> |
---|
530 | |
---|
531 | <A NAME="readUnsignedShort(byte[], int)"><!-- --></A><H3> |
---|
532 | readUnsignedShort</H3> |
---|
533 | <PRE> |
---|
534 | public static int <B>readUnsignedShort</B>(byte[] bytes, |
---|
535 | int start)</PRE> |
---|
536 | <DL> |
---|
537 | <DD>Parse an unsigned short from a byte array. |
---|
538 | <P> |
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539 | <DD><DL> |
---|
540 | </DL> |
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541 | </DD> |
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542 | <DD><DL> |
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543 | </DL> |
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544 | </DD> |
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545 | </DL> |
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546 | <HR> |
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547 | |
---|
548 | <A NAME="readInt(byte[], int)"><!-- --></A><H3> |
---|
549 | readInt</H3> |
---|
550 | <PRE> |
---|
551 | public static int <B>readInt</B>(byte[] bytes, |
---|
552 | int start)</PRE> |
---|
553 | <DL> |
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554 | <DD>Parse an integer from a byte array. |
---|
555 | <P> |
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556 | <DD><DL> |
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557 | </DL> |
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558 | </DD> |
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559 | <DD><DL> |
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560 | </DL> |
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561 | </DD> |
---|
562 | </DL> |
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563 | <HR> |
---|
564 | |
---|
565 | <A NAME="readFloat(byte[], int)"><!-- --></A><H3> |
---|
566 | readFloat</H3> |
---|
567 | <PRE> |
---|
568 | public static float <B>readFloat</B>(byte[] bytes, |
---|
569 | int start)</PRE> |
---|
570 | <DL> |
---|
571 | <DD>Parse a float from a byte array. |
---|
572 | <P> |
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573 | <DD><DL> |
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574 | </DL> |
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575 | </DD> |
---|
576 | <DD><DL> |
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577 | </DL> |
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578 | </DD> |
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579 | </DL> |
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580 | <HR> |
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581 | |
---|
582 | <A NAME="readLong(byte[], int)"><!-- --></A><H3> |
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583 | readLong</H3> |
---|
584 | <PRE> |
---|
585 | public static long <B>readLong</B>(byte[] bytes, |
---|
586 | int start)</PRE> |
---|
587 | <DL> |
---|
588 | <DD>Parse a long from a byte array. |
---|
589 | <P> |
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590 | <DD><DL> |
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591 | </DL> |
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592 | </DD> |
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593 | <DD><DL> |
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594 | </DL> |
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595 | </DD> |
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596 | </DL> |
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597 | <HR> |
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598 | |
---|
599 | <A NAME="readDouble(byte[], int)"><!-- --></A><H3> |
---|
600 | readDouble</H3> |
---|
601 | <PRE> |
---|
602 | public static double <B>readDouble</B>(byte[] bytes, |
---|
603 | int start)</PRE> |
---|
604 | <DL> |
---|
605 | <DD>Parse a double from a byte array. |
---|
606 | <P> |
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607 | <DD><DL> |
---|
608 | </DL> |
---|
609 | </DD> |
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610 | <DD><DL> |
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611 | </DL> |
---|
612 | </DD> |
---|
613 | </DL> |
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614 | <HR> |
---|
615 | |
---|
616 | <A NAME="readVLong(byte[], int)"><!-- --></A><H3> |
---|
617 | readVLong</H3> |
---|
618 | <PRE> |
---|
619 | public static long <B>readVLong</B>(byte[] bytes, |
---|
620 | int start) |
---|
621 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
---|
622 | <DL> |
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623 | <DD>Reads a zero-compressed encoded long from a byte array and returns it. |
---|
624 | <P> |
---|
625 | <DD><DL> |
---|
626 | </DL> |
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627 | </DD> |
---|
628 | <DD><DL> |
---|
629 | <DT><B>Parameters:</B><DD><CODE>bytes</CODE> - byte array with decode long<DD><CODE>start</CODE> - starting index |
---|
630 | <DT><B>Returns:</B><DD>deserialized long |
---|
631 | <DT><B>Throws:</B> |
---|
632 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
---|
633 | </DD> |
---|
634 | </DL> |
---|
635 | <HR> |
---|
636 | |
---|
637 | <A NAME="readVInt(byte[], int)"><!-- --></A><H3> |
---|
638 | readVInt</H3> |
---|
639 | <PRE> |
---|
640 | public static int <B>readVInt</B>(byte[] bytes, |
---|
641 | int start) |
---|
642 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
---|
643 | <DL> |
---|
644 | <DD>Reads a zero-compressed encoded integer from a byte array and returns it. |
---|
645 | <P> |
---|
646 | <DD><DL> |
---|
647 | </DL> |
---|
648 | </DD> |
---|
649 | <DD><DL> |
---|
650 | <DT><B>Parameters:</B><DD><CODE>bytes</CODE> - byte array with the encoded integer<DD><CODE>start</CODE> - start index |
---|
651 | <DT><B>Returns:</B><DD>deserialized integer |
---|
652 | <DT><B>Throws:</B> |
---|
653 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
---|
654 | </DD> |
---|
655 | </DL> |
---|
656 | <!-- ========= END OF CLASS DATA ========= --> |
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657 | <HR> |
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658 | |
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659 | |
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660 | <!-- ======= START OF BOTTOM NAVBAR ====== --> |
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661 | <A NAME="navbar_bottom"><!-- --></A> |
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662 | <A HREF="#skip-navbar_bottom" title="Skip navigation links"></A> |
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663 | <TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""> |
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664 | <TR> |
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665 | <TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> |
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666 | <A NAME="navbar_bottom_firstrow"><!-- --></A> |
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667 | <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> |
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668 | <TR ALIGN="center" VALIGN="top"> |
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669 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> |
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670 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> |
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671 | <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> |
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672 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/WritableComparator.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> |
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673 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> |
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674 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> |
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675 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> |
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677 | </TR> |
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678 | </TABLE> |
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679 | </TD> |
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680 | <TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM> |
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681 | </EM> |
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682 | </TD> |
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683 | </TR> |
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684 | |
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685 | <TR> |
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686 | <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> |
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687 | <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><B>PREV CLASS</B></A> |
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692 | <SCRIPT type="text/javascript"> |
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694 | if(window==top) { |
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695 | document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); |
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696 | } |
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697 | //--> |
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698 | </SCRIPT> |
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699 | <NOSCRIPT> |
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700 | <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A> |
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701 | </NOSCRIPT> |
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702 | |
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703 | |
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704 | </FONT></TD> |
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705 | </TR> |
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706 | <TR> |
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707 | <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> |
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708 | SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD> |
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709 | <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> |
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710 | DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD> |
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711 | </TR> |
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712 | </TABLE> |
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713 | <A NAME="skip-navbar_bottom"></A> |
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714 | <!-- ======== END OF BOTTOM NAVBAR ======= --> |
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715 | |
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716 | <HR> |
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717 | Copyright © 2009 The Apache Software Foundation |
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718 | </BODY> |
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719 | </HTML> |
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