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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

Constructor Summary

EmptyPCollection(DistributedPipeline pipeline, PType<T> ptype)

Method Summary

long	getLastModifiedAt()
List<PCollectionImpl<?>>	getParents()
PType<T>	getPType() Returns the PType of this PCollection.

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyPCollection

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

Method Detail

getParents

public List<PCollectionImpl<?>> getParents()

Specified by:

getParents 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.