org.apache.nutch.mapReduce.lib
Class InverseMapper

java.lang.Object
  org.apache.nutch.mapReduce.lib.InverseMapper

All Implemented Interfaces:

Configurable, Mapper

public class InverseMapper

extends Object

implements Mapper

A Mapper that swaps keys and values.

Constructor Summary

InverseMapper()

Method Summary

void	configure(JobConf job) Initializes a new instance from a JobConf.
void	map(WritableComparable key, Writable value, OutputCollector output) The inverse function.

Methods inherited from class java.lang.Object

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

Constructor Detail

InverseMapper

public InverseMapper()

Method Detail

configure

public void configure(JobConf job)

Description copied from interface: Configurable

Initializes a new instance from a JobConf.

Specified by:

configure in interface Configurable

Parameters:

job - the configuration

map

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

The inverse function. Input keys and values are swapped.

Specified by:

map in interface Mapper

Parameters:

key - the key

value - the values

output - collects mapped keys and values

Throws:

IOException