org.apache.hadoop.mapred.lib
Class RegexMapper

java.lang.Object
  org.apache.hadoop.mapred.MapReduceBase
      org.apache.hadoop.mapred.lib.RegexMapper

All Implemented Interfaces:

Closeable, JobConfigurable, Mapper

public class RegexMapper
extends MapReduceBase
implements Mapper

A Mapper that extracts text matching a regular expression.

Constructor Summary

RegexMapper()

Method Summary

void	configure(JobConf job) Default implementation that does nothing.
void	map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter) Maps a single input key/value pair into intermediate key/value pairs.

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

close

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.io.Closeable

close

Constructor Detail

RegexMapper

public RegexMapper()

Method Detail

configure

public void configure(JobConf job)

Description copied from class: MapReduceBase

Default implementation that does nothing.

Specified by:

configure in interface JobConfigurable

Overrides:

configure in class MapReduceBase

Parameters:

job - the configuration

map

public void map(WritableComparable key,
                Writable value,
                OutputCollector output,
                Reporter reporter)
         throws IOException

Description copied from interface: Mapper

Maps a single input key/value pair into intermediate key/value pairs. Output pairs need not be of the same types as input pairs. A given input pair may map to zero or many output pairs. Output pairs are collected with calls to OutputCollector.collect(WritableComparable,Writable).

Specified by:

map in interface Mapper

Parameters:

key - the key

value - the values

output - collects mapped keys and values

Throws:

IOException