001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019 package org.apache.hadoop.mapred.lib; 020 021 import java.io.IOException; 022 import java.util.regex.Matcher; 023 import java.util.regex.Pattern; 024 025 import org.apache.hadoop.classification.InterfaceAudience; 026 import org.apache.hadoop.classification.InterfaceStability; 027 import org.apache.hadoop.io.LongWritable; 028 import org.apache.hadoop.io.Text; 029 import org.apache.hadoop.mapred.JobConf; 030 import org.apache.hadoop.mapred.MapReduceBase; 031 import org.apache.hadoop.mapred.Mapper; 032 import org.apache.hadoop.mapred.OutputCollector; 033 import org.apache.hadoop.mapred.Reporter; 034 035 036 /** A {@link Mapper} that extracts text matching a regular expression. 037 * @deprecated Use {@link org.apache.hadoop.mapreduce.lib.map.RegexMapper} 038 */ 039 @Deprecated 040 @InterfaceAudience.Public 041 @InterfaceStability.Stable 042 public class RegexMapper<K> extends MapReduceBase 043 implements Mapper<K, Text, Text, LongWritable> { 044 045 private Pattern pattern; 046 private int group; 047 048 public void configure(JobConf job) { 049 pattern = Pattern.compile(job.get(org.apache.hadoop.mapreduce.lib.map. 050 RegexMapper.PATTERN)); 051 group = job.getInt(org.apache.hadoop.mapreduce.lib.map. 052 RegexMapper.GROUP, 0); 053 } 054 055 public void map(K key, Text value, 056 OutputCollector<Text, LongWritable> output, 057 Reporter reporter) 058 throws IOException { 059 String text = value.toString(); 060 Matcher matcher = pattern.matcher(text); 061 while (matcher.find()) { 062 output.collect(new Text(matcher.group(group)), new LongWritable(1)); 063 } 064 } 065 066 }