<HTML>
<BODY BGCOLOR="white">
<PRE>
<FONT color="green">001</FONT>    /**<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT>     * or more contributor license agreements.  See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT>     * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT>     * regarding copyright ownership.  The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT>     * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<FONT color="green">007</FONT>     * "License"); you may not use this file except in compliance<a name="line.7"></a>
<FONT color="green">008</FONT>     * with the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    package org.apache.hadoop.mapred.lib;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.22"></a>
<FONT color="green">023</FONT>    import org.apache.hadoop.mapred.JobConf;<a name="line.23"></a>
<FONT color="green">024</FONT>    import org.apache.hadoop.mapred.JobConfigurable;<a name="line.24"></a>
<FONT color="green">025</FONT>    import org.apache.hadoop.mapreduce.JobContext;<a name="line.25"></a>
<FONT color="green">026</FONT>    <a name="line.26"></a>
<FONT color="green">027</FONT>    /**<a name="line.27"></a>
<FONT color="green">028</FONT>     * This comparator implementation provides a subset of the features provided<a name="line.28"></a>
<FONT color="green">029</FONT>     * by the Unix/GNU Sort. In particular, the supported features are:<a name="line.29"></a>
<FONT color="green">030</FONT>     * -n, (Sort numerically)<a name="line.30"></a>
<FONT color="green">031</FONT>     * -r, (Reverse the result of comparison)<a name="line.31"></a>
<FONT color="green">032</FONT>     * -k pos1[,pos2], where pos is of the form f[.c][opts], where f is the number<a name="line.32"></a>
<FONT color="green">033</FONT>     *  of the field to use, and c is the number of the first character from the<a name="line.33"></a>
<FONT color="green">034</FONT>     *  beginning of the field. Fields and character posns are numbered starting<a name="line.34"></a>
<FONT color="green">035</FONT>     *  with 1; a character position of zero in pos2 indicates the field's last<a name="line.35"></a>
<FONT color="green">036</FONT>     *  character. If '.c' is omitted from pos1, it defaults to 1 (the beginning<a name="line.36"></a>
<FONT color="green">037</FONT>     *  of the field); if omitted from pos2, it defaults to 0 (the end of the<a name="line.37"></a>
<FONT color="green">038</FONT>     *  field). opts are ordering options (any of 'nr' as described above). <a name="line.38"></a>
<FONT color="green">039</FONT>     * We assume that the fields in the key are separated by<a name="line.39"></a>
<FONT color="green">040</FONT>     * {@link JobContext#MAP_OUTPUT_KEY_FIELD_SEPERATOR} <a name="line.40"></a>
<FONT color="green">041</FONT>     */<a name="line.41"></a>
<FONT color="green">042</FONT>    @InterfaceAudience.Public<a name="line.42"></a>
<FONT color="green">043</FONT>    @InterfaceStability.Stable<a name="line.43"></a>
<FONT color="green">044</FONT>    public class KeyFieldBasedComparator&lt;K, V&gt; extends <a name="line.44"></a>
<FONT color="green">045</FONT>        org.apache.hadoop.mapreduce.lib.partition.KeyFieldBasedComparator&lt;K, V&gt;<a name="line.45"></a>
<FONT color="green">046</FONT>        implements JobConfigurable {<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>      public void configure(JobConf job) {<a name="line.48"></a>
<FONT color="green">049</FONT>        super.setConf(job);<a name="line.49"></a>
<FONT color="green">050</FONT>      }<a name="line.50"></a>
<FONT color="green">051</FONT>    }<a name="line.51"></a>




























































</PRE>
</BODY>
</HTML>
