| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package edu.uci.ics.hyracks.examples.wordcount; |
| |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.util.Iterator; |
| import java.util.StringTokenizer; |
| |
| import org.apache.hadoop.io.IntWritable; |
| import org.apache.hadoop.io.LongWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.MapReduceBase; |
| import org.apache.hadoop.mapred.Mapper; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.Reducer; |
| import org.apache.hadoop.mapred.Reporter; |
| |
| public class WordCount implements Serializable { |
| public static class Map extends MapReduceBase implements Mapper<LongWritable, Text, Text, IntWritable>, |
| Serializable { |
| |
| private final static IntWritable ONE = new IntWritable(1); |
| private Text word = new Text(); |
| |
| public void map(LongWritable key, Text value, OutputCollector<Text, IntWritable> output, Reporter reporter) |
| throws IOException { |
| String line = value.toString(); |
| StringTokenizer tokenizer = new StringTokenizer(line); |
| while (tokenizer.hasMoreTokens()) { |
| String token = tokenizer.nextToken(); |
| word.set(token); |
| output.collect(word, ONE); |
| } |
| } |
| } |
| |
| public static class Reduce extends MapReduceBase implements Reducer<Text, IntWritable, Text, IntWritable>, |
| Serializable { |
| |
| public void reduce(Text key, Iterator<IntWritable> values, OutputCollector<Text, IntWritable> output, |
| Reporter reporter) throws IOException { |
| int sum = 0; |
| while (values.hasNext()) { |
| sum += values.next().get(); |
| } |
| output.collect(key, new IntWritable(sum)); |
| } |
| } |
| } |