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org.apache.crunch.fn
Class CompositeMapFn<R,S,T>

java.lang.Object
  org.apache.crunch.DoFn<S,T>
      org.apache.crunch.MapFn<R,T>
          org.apache.crunch.fn.CompositeMapFn<R,S,T>

All Implemented Interfaces:

Serializable

public class CompositeMapFn<R,S,T>
extends MapFn<R,T>

See Also:

Serialized Form

Constructor Summary

CompositeMapFn(MapFn<R,S> first, MapFn<S,T> second)

Method Summary

void	cleanup(Emitter<T> emitter) Called during the cleanup of the MapReduce job this DoFn is associated with.
void	configure(org.apache.hadoop.conf.Configuration conf) Called during the job planning phase.
MapFn<R,S>	getFirst()
MapFn<S,T>	getSecond()
void	initialize() Called during the setup of the MapReduce job this DoFn is associated with.
T	map(R input) Maps the given input into an instance of the output type.
void	setConfigurationForTest(org.apache.hadoop.conf.Configuration conf) Sets a Configuration instance to be used during unit tests.

Methods inherited from class org.apache.crunch.MapFn

process, scaleFactor

Methods inherited from class org.apache.crunch.DoFn

setContext

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeMapFn

public CompositeMapFn(MapFn<R,S> first,
                      MapFn<S,T> second)

Method Detail

initialize

public void initialize()

Description copied from class: DoFn

Called during the setup of the MapReduce job this DoFn is associated with. Subclasses may override this method to do appropriate initialization.

Overrides:

initialize in class DoFn<R,T>

getFirst

public MapFn<R,S> getFirst()

getSecond

public MapFn<S,T> getSecond()

map

public T map(R input)

Description copied from class: MapFn

Maps the given input into an instance of the output type.

Specified by:

map in class MapFn<R,T>

cleanup

public void cleanup(Emitter<T> emitter)

Description copied from class: DoFn

Called during the cleanup of the MapReduce job this DoFn is associated with. Subclasses may override this method to do appropriate cleanup.

Overrides:

cleanup in class DoFn<R,T>

Parameters:

emitter - The emitter that was used for output

configure

public void configure(org.apache.hadoop.conf.Configuration conf)

Description copied from class: DoFn

Called during the job planning phase. Subclasses may override this method in order to modify the configuration of the Job that this DoFn instance belongs to.

Overrides:

configure in class DoFn<R,T>

Parameters:

conf - The Configuration instance for the Job.

setConfigurationForTest

public void setConfigurationForTest(org.apache.hadoop.conf.Configuration conf)

Description copied from class: DoFn

Sets a Configuration instance to be used during unit tests.

Overrides:

setConfigurationForTest in class DoFn<R,T>

Parameters:

conf - The Configuration instance.