edu.purdue.cs.eblanton
Class WordMap

java.lang.Object
  org.apache.hadoop.mapred.MapReduceBase
      edu.purdue.cs.eblanton.WordMap

All Implemented Interfaces:

java.io.Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>

public class WordMap
extends org.apache.hadoop.mapred.MapReduceBase
implements org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>

WordMap implements a map operation which takes a WritableComparable and a Text object representing a line of text, and outputs a <Text, IntWritable> tuple for each word in that line of text with the IntWritable having a value of 1.

See Also:

MapReduceBase, Mapper

Constructor Summary

WordMap()

Method Summary

void	map(org.apache.hadoop.io.WritableComparable key, org.apache.hadoop.io.Text value, org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable> output, org.apache.hadoop.mapred.Reporter reporter) Implements the WordMap map operation.

Methods inherited from class org.apache.hadoop.mapred.MapReduceBase

close, configure

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.hadoop.mapred.JobConfigurable

configure

Methods inherited from interface java.io.Closeable

close

Constructor Detail

WordMap

public WordMap()

Method Detail

map

public void map(org.apache.hadoop.io.WritableComparable key,
                org.apache.hadoop.io.Text value,
                org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable> output,
                org.apache.hadoop.mapred.Reporter reporter)
         throws java.io.IOException

Implements the WordMap map operation.

Specified by:

map in interface org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>

Parameters:

key - the input key (ignored)

value - the line of text to be tokenized and output

output - the output collector for the resulting <word, 1> pairs

reporter - ignored

Throws:

java.io.IOException