This project has retired. For details please refer to its Attic page.

org.apache.crunch.impl.dist.collect
Class EmptyPCollection<T>

java.lang.Object
  org.apache.crunch.impl.dist.collect.PCollectionImpl<T>
      org.apache.crunch.impl.dist.collect.EmptyPCollection<T>

All Implemented Interfaces:

PCollection<T>

Direct Known Subclasses:

EmptyPCollection

public class EmptyPCollection<T>
extends PCollectionImpl<T>

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.crunch.impl.dist.collect.PCollectionImpl

PCollectionImpl.Visitor

Field Summary

Fields inherited from class org.apache.crunch.impl.dist.collect.PCollectionImpl

doOptions, materializedAt, pipeline

Constructor Summary

EmptyPCollection(DistributedPipeline pipeline, PType<T> ptype)

Method Summary

protected void	acceptInternal(PCollectionImpl.Visitor visitor)
long	getLastModifiedAt()
List<PCollectionImpl<?>>	getParents()
PType<T>	getPType() Returns the PType of this PCollection.
protected ReadableData<T>	getReadableDataInternal()
protected long	getSizeInternal()

Methods inherited from class org.apache.crunch.impl.dist.collect.PCollectionImpl

accept, asCollection, asReadable, by, by, cache, cache, count, filter, filter, getChainingCollection, getDepth, getMaterializedAt, getName, getOnlyParent, getParallelDoOptions, getPipeline, getSize, getTargetDependencies, getTypeFamily, isBreakpoint, length, materialize, materializeAt, materializedData, max, min, parallelDo, parallelDo, parallelDo, parallelDo, parallelDo, parallelDo, setBreakpoint, toString, union, union, write, write

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyPCollection

public EmptyPCollection(DistributedPipeline pipeline,
                        PType<T> ptype)

Method Detail

acceptInternal

protected void acceptInternal(PCollectionImpl.Visitor visitor)

Specified by:

acceptInternal in class PCollectionImpl<T>

getParents

public List<PCollectionImpl<?>> getParents()

Specified by:

getParents in class PCollectionImpl<T>

getReadableDataInternal

protected ReadableData<T> getReadableDataInternal()

Specified by:

getReadableDataInternal in class PCollectionImpl<T>

getSizeInternal

protected long getSizeInternal()

Specified by:

getSizeInternal in class PCollectionImpl<T>

getLastModifiedAt

public long getLastModifiedAt()

Specified by:

getLastModifiedAt in class PCollectionImpl<T>

getPType

public PType<T> getPType()

Description copied from interface: PCollection

Returns the PType of this PCollection.