org.apache.crunch.impl.dist.collect

Class EmptyPTable<K,V>

java.lang.Object

org.apache.crunch.impl.dist.collect.PCollectionImpl<Pair<K,V>>

org.apache.crunch.impl.dist.collect.PTableBase<K,V>

org.apache.crunch.impl.dist.collect.EmptyPTable<K,V>

All Implemented Interfaces:

PCollection<Pair<K,V>>, PTable<K,V>

Direct Known Subclasses:

EmptyPTable

public class EmptyPTable<K,V>
extends PTableBase<K,V>

Nested Class Summary

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

PCollectionImpl.Visitor

Constructor Summary

Constructors

Constructor and Description
EmptyPTable(DistributedPipeline pipeline, PTableType<K,V> ptype)

Method Summary

Methods

Modifier and Type	Method and Description
long	getLastModifiedAt() The time of the most recent modification to one of the input sources to the collection.
List<PCollectionImpl<?>>	getParents()
PTableType<K,V>	getPTableType() Returns the PTableType of this PTable.
PType<Pair<K,V>>	getPType() Returns the PType of this PCollection.

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

asMap, bottom, cache, cache, cogroup, collectValues, filter, filter, getKeyType, getValueType, groupByKey, groupByKey, groupByKey, join, keys, mapKeys, mapKeys, mapValues, mapValues, materializeToMap, top, union, union, values, write, write

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

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.crunch.PCollection

aggregate, asCollection, asReadable, by, by, count, first, getName, getPipeline, getSize, getTypeFamily, length, materialize, max, min, parallelDo, parallelDo, parallelDo, parallelDo, parallelDo, parallelDo, sequentialDo, union, union

Constructor Detail

EmptyPTable

public EmptyPTable(DistributedPipeline pipeline,
           PTableType<K,V> ptype)

Method Detail

getParents

public List<PCollectionImpl<?>> getParents()

Specified by:

getParents in class PCollectionImpl<Pair<K,V>>

getLastModifiedAt

public long getLastModifiedAt()

Description copied from class: PCollectionImpl

The time of the most recent modification to one of the input sources to the collection. If the time can not be determined then -1 should be returned.

Specified by:

getLastModifiedAt in class PCollectionImpl<Pair<K,V>>

Returns:

time of the most recent modification to one of the input sources to the collection.

getPTableType

public PTableType<K,V> getPTableType()

Description copied from interface: PTable

Returns the PTableType of this PTable.

getPType

public PType<Pair<K,V>> getPType()

Description copied from interface: PCollection

Returns the PType of this PCollection.