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7RecordComparator (Hadoop 0.20.1 API)
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91org.apache.hadoop.record</FONT>
92<BR>
93Class RecordComparator</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 "><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">org.apache.hadoop.io.WritableComparator</A>
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.record.RecordComparator</B>
98</PRE>
99<DL>
100<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>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public abstract class <B>RecordComparator</B><DT>extends <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A></DL>
105</PRE>
106
107<P>
108A raw record comparator base class
109<P>
110
111<P>
112<HR>
113
114<P>
115
116<!-- ======== CONSTRUCTOR SUMMARY ======== -->
117
118<A NAME="constructor_summary"><!-- --></A>
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120<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
121<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
122<B>Constructor Summary</B></FONT></TH>
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124<TR BGCOLOR="white" CLASS="TableRowColor">
125<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
126<CODE>protected </CODE></FONT></TD>
127<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/RecordComparator.html#RecordComparator(java.lang.Class)">RecordComparator</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;recordClass)</CODE>
128
129<BR>
130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a raw <A HREF="../../../../org/apache/hadoop/record/Record.html" title="class in org.apache.hadoop.record"><CODE>Record</CODE></A> comparison implementation.</TD>
131</TR>
132</TABLE>
133&nbsp;
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140<B>Method Summary</B></FONT></TH>
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142<TR BGCOLOR="white" CLASS="TableRowColor">
143<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
144<CODE>abstract &nbsp;int</CODE></FONT></TD>
145<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/RecordComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></B>(byte[]&nbsp;b1,
146        int&nbsp;s1,
147        int&nbsp;l1,
148        byte[]&nbsp;b2,
149        int&nbsp;s2,
150        int&nbsp;l2)</CODE>
151
152<BR>
153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Optimization hook.</TD>
154</TR>
155<TR BGCOLOR="white" CLASS="TableRowColor">
156<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
157<CODE>static&nbsp;void</CODE></FONT></TD>
158<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/RecordComparator.html#define(java.lang.Class, org.apache.hadoop.record.RecordComparator)">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,
159       <A HREF="../../../../org/apache/hadoop/record/RecordComparator.html" title="class in org.apache.hadoop.record">RecordComparator</A>&nbsp;comparator)</CODE>
160
161<BR>
162&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Register an optimized comparator for a <A HREF="../../../../org/apache/hadoop/record/Record.html" title="class in org.apache.hadoop.record"><CODE>Record</CODE></A> implementation.</TD>
163</TR>
164</TABLE>
165&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.io.WritableComparator"><!-- --></A>
166<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
167<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
168<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.io.<A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A></B></TH>
169</TR>
170<TR BGCOLOR="white" CLASS="TableRowColor">
171<TD><CODE><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(java.lang.Object, java.lang.Object)">compare</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.WritableComparable)">compare</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compareBytes(byte[], int, int, byte[], int, int)">compareBytes</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#define(java.lang.Class, org.apache.hadoop.io.WritableComparator)">define</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#get(java.lang.Class)">get</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#getKeyClass()">getKeyClass</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#hashBytes(byte[], int)">hashBytes</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#newKey()">newKey</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readDouble(byte[], int)">readDouble</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readFloat(byte[], int)">readFloat</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readInt(byte[], int)">readInt</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readLong(byte[], int)">readLong</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readUnsignedShort(byte[], int)">readUnsignedShort</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readVInt(byte[], int)">readVInt</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#readVLong(byte[], int)">readVLong</A></CODE></TD>
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181</TR>
182</TABLE>
183&nbsp;<A NAME="methods_inherited_from_class_java.util.Comparator"><!-- --></A>
184<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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186<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>
187</TR>
188<TR BGCOLOR="white" CLASS="TableRowColor">
189<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>
190</TR>
191</TABLE>
192&nbsp;
193<P>
194
195<!-- ========= CONSTRUCTOR DETAIL ======== -->
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201<B>Constructor Detail</B></FONT></TH>
202</TR>
203</TABLE>
204
205<A NAME="RecordComparator(java.lang.Class)"><!-- --></A><H3>
206RecordComparator</H3>
207<PRE>
208protected <B>RecordComparator</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;recordClass)</PRE>
209<DL>
210<DD>Construct a raw <A HREF="../../../../org/apache/hadoop/record/Record.html" title="class in org.apache.hadoop.record"><CODE>Record</CODE></A> comparison implementation.
211<P>
212</DL>
213
214<!-- ============ METHOD DETAIL ========== -->
215
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219<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
220<B>Method Detail</B></FONT></TH>
221</TR>
222</TABLE>
223
224<A NAME="compare(byte[], int, int, byte[], int, int)"><!-- --></A><H3>
225compare</H3>
226<PRE>
227public abstract int <B>compare</B>(byte[]&nbsp;b1,
228                            int&nbsp;s1,
229                            int&nbsp;l1,
230                            byte[]&nbsp;b2,
231                            int&nbsp;s2,
232                            int&nbsp;l2)</PRE>
233<DL>
234<DD><B>Description copied from class: <CODE><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(byte[], int, int, byte[], int, int)">WritableComparator</A></CODE></B></DD>
235<DD>Optimization hook.  Override this to make SequenceFile.Sorter's scream.
236
237 <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>WritableComparator.compare(WritableComparable,WritableComparable)</CODE></A>.
238<P>
239<DD><DL>
240<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><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html#compare(byte[], int, int, byte[], int, int)">compare</A></CODE> in class <CODE><A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A></CODE></DL>
241</DD>
242<DD><DL>
243</DL>
244</DD>
245</DL>
246<HR>
247
248<A NAME="define(java.lang.Class, org.apache.hadoop.record.RecordComparator)"><!-- --></A><H3>
249define</H3>
250<PRE>
251public 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,
252                          <A HREF="../../../../org/apache/hadoop/record/RecordComparator.html" title="class in org.apache.hadoop.record">RecordComparator</A>&nbsp;comparator)</PRE>
253<DL>
254<DD>Register an optimized comparator for a <A HREF="../../../../org/apache/hadoop/record/Record.html" title="class in org.apache.hadoop.record"><CODE>Record</CODE></A> implementation.
255<P>
256<DD><DL>
257<DT><B>Parameters:</B><DD><CODE>c</CODE> - record classs for which a raw comparator is provided<DD><CODE>comparator</CODE> - Raw comparator instance for class c</DL>
258</DD>
259</DL>
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