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7WritableComparator (Hadoop 0.20.1 API)
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91org.apache.hadoop.io</FONT>
92<BR>
93Class WritableComparator</H2>
94<PRE>
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>
96  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.io.WritableComparator</B>
97</PRE>
98<DL>
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>
100</DL>
101<DL>
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>
103</DL>
104<HR>
105<DL>
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>
107</PRE>
108
109<P>
110A Comparator for <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A>s.
111
112 <p>This base implemenation uses the natural ordering.  To define alternate
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>.
114
115 <p>One may optimize compare-intensive operations by overriding
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
117 provided to assist in optimized implementations of this method.
118<P>
119
120<P>
121<HR>
122
123<P>
124
125<!-- ======== CONSTRUCTOR SUMMARY ======== -->
126
127<A NAME="constructor_summary"><!-- --></A>
128<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
129<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
130<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
131<B>Constructor Summary</B></FONT></TH>
132</TR>
133<TR BGCOLOR="white" CLASS="TableRowColor">
134<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
135<CODE>protected </CODE></FONT></TD>
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>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt;&nbsp;keyClass)</CODE>
137
138<BR>
139&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct for a <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> implementation.</TD>
140</TR>
141<TR BGCOLOR="white" CLASS="TableRowColor">
142<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
143<CODE>protected </CODE></FONT></TD>
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>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt;&nbsp;keyClass,
145                   boolean&nbsp;createInstances)</CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
149</TR>
150</TABLE>
151&nbsp;
152<!-- ========== METHOD SUMMARY =========== -->
153
154<A NAME="method_summary"><!-- --></A>
155<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
156<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
157<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
158<B>Method Summary</B></FONT></TH>
159</TR>
160<TR BGCOLOR="white" CLASS="TableRowColor">
161<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
162<CODE>&nbsp;int</CODE></FONT></TD>
163<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></B>(byte[]&nbsp;b1,
164        int&nbsp;s1,
165        int&nbsp;l1,
166        byte[]&nbsp;b2,
167        int&nbsp;s2,
168        int&nbsp;l2)</CODE>
169
170<BR>
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Optimization hook.</TD>
172</TR>
173<TR BGCOLOR="white" CLASS="TableRowColor">
174<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
175<CODE>&nbsp;int</CODE></FONT></TD>
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>&nbsp;a,
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>&nbsp;b)</CODE>
178
179<BR>
180&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
181</TR>
182<TR BGCOLOR="white" CLASS="TableRowColor">
183<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
184<CODE>&nbsp;int</CODE></FONT></TD>
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>&nbsp;a,
186        <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;b)</CODE>
187
188<BR>
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compare two WritableComparables.</TD>
190</TR>
191<TR BGCOLOR="white" CLASS="TableRowColor">
192<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
193<CODE>static&nbsp;int</CODE></FONT></TD>
194<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compareBytes(byte[], int, int, byte[], int, int)">compareBytes</A></B>(byte[]&nbsp;b1,
195             int&nbsp;s1,
196             int&nbsp;l1,
197             byte[]&nbsp;b2,
198             int&nbsp;s2,
199             int&nbsp;l2)</CODE>
200
201<BR>
202&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lexicographic order of binary data.</TD>
203</TR>
204<TR BGCOLOR="white" CLASS="TableRowColor">
205<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
206<CODE>static&nbsp;void</CODE></FONT></TD>
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>&nbsp;c,
208       <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator)</CODE>
209
210<BR>
211&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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>
212 implementation.</TD>
213</TR>
214<TR BGCOLOR="white" CLASS="TableRowColor">
215<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
216<CODE>static&nbsp;<A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A></CODE></FONT></TD>
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>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt;&nbsp;c)</CODE>
218
219<BR>
220&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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>
221</TR>
222<TR BGCOLOR="white" CLASS="TableRowColor">
223<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
224<CODE>&nbsp;<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>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt;</CODE></FONT></TD>
225<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#getKeyClass()">getKeyClass</A></B>()</CODE>
226
227<BR>
228&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the WritableComparable implementation class.</TD>
229</TR>
230<TR BGCOLOR="white" CLASS="TableRowColor">
231<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
232<CODE>static&nbsp;int</CODE></FONT></TD>
233<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#hashBytes(byte[], int)">hashBytes</A></B>(byte[]&nbsp;bytes,
234          int&nbsp;length)</CODE>
235
236<BR>
237&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compute hash for binary data.</TD>
238</TR>
239<TR BGCOLOR="white" CLASS="TableRowColor">
240<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
241<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A></CODE></FONT></TD>
242<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#newKey()">newKey</A></B>()</CODE>
243
244<BR>
245&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a new <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><CODE>WritableComparable</CODE></A> instance.</TD>
246</TR>
247<TR BGCOLOR="white" CLASS="TableRowColor">
248<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
249<CODE>static&nbsp;double</CODE></FONT></TD>
250<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readDouble(byte[], int)">readDouble</A></B>(byte[]&nbsp;bytes,
251           int&nbsp;start)</CODE>
252
253<BR>
254&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parse a double from a byte array.</TD>
255</TR>
256<TR BGCOLOR="white" CLASS="TableRowColor">
257<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
258<CODE>static&nbsp;float</CODE></FONT></TD>
259<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readFloat(byte[], int)">readFloat</A></B>(byte[]&nbsp;bytes,
260          int&nbsp;start)</CODE>
261
262<BR>
263&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parse a float from a byte array.</TD>
264</TR>
265<TR BGCOLOR="white" CLASS="TableRowColor">
266<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
267<CODE>static&nbsp;int</CODE></FONT></TD>
268<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readInt(byte[], int)">readInt</A></B>(byte[]&nbsp;bytes,
269        int&nbsp;start)</CODE>
270
271<BR>
272&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parse an integer from a byte array.</TD>
273</TR>
274<TR BGCOLOR="white" CLASS="TableRowColor">
275<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
276<CODE>static&nbsp;long</CODE></FONT></TD>
277<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readLong(byte[], int)">readLong</A></B>(byte[]&nbsp;bytes,
278         int&nbsp;start)</CODE>
279
280<BR>
281&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parse a long from a byte array.</TD>
282</TR>
283<TR BGCOLOR="white" CLASS="TableRowColor">
284<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
285<CODE>static&nbsp;int</CODE></FONT></TD>
286<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readUnsignedShort(byte[], int)">readUnsignedShort</A></B>(byte[]&nbsp;bytes,
287                  int&nbsp;start)</CODE>
288
289<BR>
290&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parse an unsigned short from a byte array.</TD>
291</TR>
292<TR BGCOLOR="white" CLASS="TableRowColor">
293<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
294<CODE>static&nbsp;int</CODE></FONT></TD>
295<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readVInt(byte[], int)">readVInt</A></B>(byte[]&nbsp;bytes,
296         int&nbsp;start)</CODE>
297
298<BR>
299&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads a zero-compressed encoded integer from a byte array and returns it.</TD>
300</TR>
301<TR BGCOLOR="white" CLASS="TableRowColor">
302<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
303<CODE>static&nbsp;long</CODE></FONT></TD>
304<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readVLong(byte[], int)">readVLong</A></B>(byte[]&nbsp;bytes,
305          int&nbsp;start)</CODE>
306
307<BR>
308&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads a zero-compressed encoded long from a byte array and returns it.</TD>
309</TR>
310</TABLE>
311&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
312<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
313<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
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>
315</TR>
316<TR BGCOLOR="white" CLASS="TableRowColor">
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>
318</TR>
319</TABLE>
320&nbsp;<A NAME="methods_inherited_from_class_java.util.Comparator"><!-- --></A>
321<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
322<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
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>
324</TR>
325<TR BGCOLOR="white" CLASS="TableRowColor">
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>
327</TR>
328</TABLE>
329&nbsp;
330<P>
331
332<!-- ========= CONSTRUCTOR DETAIL ======== -->
333
334<A NAME="constructor_detail"><!-- --></A>
335<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
336<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
337<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
338<B>Constructor Detail</B></FONT></TH>
339</TR>
340</TABLE>
341
342<A NAME="WritableComparator(java.lang.Class)"><!-- --></A><H3>
343WritableComparator</H3>
344<PRE>
345protected <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>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt;&nbsp;keyClass)</PRE>
346<DL>
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.
348<P>
349</DL>
350<HR>
351
352<A NAME="WritableComparator(java.lang.Class, boolean)"><!-- --></A><H3>
353WritableComparator</H3>
354<PRE>
355protected <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>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt;&nbsp;keyClass,
356                             boolean&nbsp;createInstances)</PRE>
357<DL>
358</DL>
359
360<!-- ============ METHOD DETAIL ========== -->
361
362<A NAME="method_detail"><!-- --></A>
363<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
364<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
365<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
366<B>Method Detail</B></FONT></TH>
367</TR>
368</TABLE>
369
370<A NAME="get(java.lang.Class)"><!-- --></A><H3>
371get</H3>
372<PRE>
373public 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>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt;&nbsp;c)</PRE>
374<DL>
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.
376<P>
377<DD><DL>
378</DL>
379</DD>
380<DD><DL>
381</DL>
382</DD>
383</DL>
384<HR>
385
386<A NAME="define(java.lang.Class, org.apache.hadoop.io.WritableComparator)"><!-- --></A><H3>
387define</H3>
388<PRE>
389public 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>&nbsp;c,
390                          <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator)</PRE>
391<DL>
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>
393 implementation.
394<P>
395<DD><DL>
396</DL>
397</DD>
398<DD><DL>
399</DL>
400</DD>
401</DL>
402<HR>
403
404<A NAME="getKeyClass()"><!-- --></A><H3>
405getKeyClass</H3>
406<PRE>
407public <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>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&gt; <B>getKeyClass</B>()</PRE>
408<DL>
409<DD>Returns the WritableComparable implementation class.
410<P>
411<DD><DL>
412</DL>
413</DD>
414<DD><DL>
415</DL>
416</DD>
417</DL>
418<HR>
419
420<A NAME="newKey()"><!-- --></A><H3>
421newKey</H3>
422<PRE>
423public <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> <B>newKey</B>()</PRE>
424<DL>
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.
426<P>
427<DD><DL>
428</DL>
429</DD>
430<DD><DL>
431</DL>
432</DD>
433</DL>
434<HR>
435
436<A NAME="compare(byte[], int, int, byte[], int, int)"><!-- --></A><H3>
437compare</H3>
438<PRE>
439public int <B>compare</B>(byte[]&nbsp;b1,
440                   int&nbsp;s1,
441                   int&nbsp;l1,
442                   byte[]&nbsp;b2,
443                   int&nbsp;s2,
444                   int&nbsp;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>.
449<P>
450<DD><DL>
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>
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>
460compare</H3>
461<PRE>
462public int <B>compare</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;a,
463                   <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;b)</PRE>
464<DL>
465<DD>Compare two WritableComparables.
466
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>.
468<P>
469<DD><DL>
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>
479compare</H3>
480<PRE>
481public 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>&nbsp;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>&nbsp;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>
486</DD>
487<DD><DL>
488</DL>
489</DD>
490</DL>
491<HR>
492
493<A NAME="compareBytes(byte[], int, int, byte[], int, int)"><!-- --></A><H3>
494compareBytes</H3>
495<PRE>
496public static int <B>compareBytes</B>(byte[]&nbsp;b1,
497                               int&nbsp;s1,
498                               int&nbsp;l1,
499                               byte[]&nbsp;b2,
500                               int&nbsp;s2,
501                               int&nbsp;l2)</PRE>
502<DL>
503<DD>Lexicographic order of binary data.
504<P>
505<DD><DL>
506</DL>
507</DD>
508<DD><DL>
509</DL>
510</DD>
511</DL>
512<HR>
513
514<A NAME="hashBytes(byte[], int)"><!-- --></A><H3>
515hashBytes</H3>
516<PRE>
517public static int <B>hashBytes</B>(byte[]&nbsp;bytes,
518                            int&nbsp;length)</PRE>
519<DL>
520<DD>Compute hash for binary data.
521<P>
522<DD><DL>
523</DL>
524</DD>
525<DD><DL>
526</DL>
527</DD>
528</DL>
529<HR>
530
531<A NAME="readUnsignedShort(byte[], int)"><!-- --></A><H3>
532readUnsignedShort</H3>
533<PRE>
534public static int <B>readUnsignedShort</B>(byte[]&nbsp;bytes,
535                                    int&nbsp;start)</PRE>
536<DL>
537<DD>Parse an unsigned short from a byte array.
538<P>
539<DD><DL>
540</DL>
541</DD>
542<DD><DL>
543</DL>
544</DD>
545</DL>
546<HR>
547
548<A NAME="readInt(byte[], int)"><!-- --></A><H3>
549readInt</H3>
550<PRE>
551public static int <B>readInt</B>(byte[]&nbsp;bytes,
552                          int&nbsp;start)</PRE>
553<DL>
554<DD>Parse an integer from a byte array.
555<P>
556<DD><DL>
557</DL>
558</DD>
559<DD><DL>
560</DL>
561</DD>
562</DL>
563<HR>
564
565<A NAME="readFloat(byte[], int)"><!-- --></A><H3>
566readFloat</H3>
567<PRE>
568public static float <B>readFloat</B>(byte[]&nbsp;bytes,
569                              int&nbsp;start)</PRE>
570<DL>
571<DD>Parse a float from a byte array.
572<P>
573<DD><DL>
574</DL>
575</DD>
576<DD><DL>
577</DL>
578</DD>
579</DL>
580<HR>
581
582<A NAME="readLong(byte[], int)"><!-- --></A><H3>
583readLong</H3>
584<PRE>
585public static long <B>readLong</B>(byte[]&nbsp;bytes,
586                            int&nbsp;start)</PRE>
587<DL>
588<DD>Parse a long from a byte array.
589<P>
590<DD><DL>
591</DL>
592</DD>
593<DD><DL>
594</DL>
595</DD>
596</DL>
597<HR>
598
599<A NAME="readDouble(byte[], int)"><!-- --></A><H3>
600readDouble</H3>
601<PRE>
602public static double <B>readDouble</B>(byte[]&nbsp;bytes,
603                                int&nbsp;start)</PRE>
604<DL>
605<DD>Parse a double from a byte array.
606<P>
607<DD><DL>
608</DL>
609</DD>
610<DD><DL>
611</DL>
612</DD>
613</DL>
614<HR>
615
616<A NAME="readVLong(byte[], int)"><!-- --></A><H3>
617readVLong</H3>
618<PRE>
619public static long <B>readVLong</B>(byte[]&nbsp;bytes,
620                             int&nbsp;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>
623<DD>Reads a zero-compressed encoded long from a byte array and returns it.
624<P>
625<DD><DL>
626</DL>
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>
638readVInt</H3>
639<PRE>
640public static int <B>readVInt</B>(byte[]&nbsp;bytes,
641                           int&nbsp;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>
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