Package org.apache.wayang.basic.operators

Class CollectionSource<T>

java.lang.Object

org.apache.wayang.core.plan.wayangplan.OperatorBase

org.apache.wayang.core.plan.wayangplan.UnarySource<T>

org.apache.wayang.basic.operators.CollectionSource<T>

All Implemented Interfaces:

Serializable, ActualOperator, ElementaryOperator, Operator

Direct Known Subclasses:

FlinkCollectionSource, JavaCollectionSource, SparkCollectionSource, TensorflowCollectionSource

public class CollectionSource<T>
extends UnarySource<T>
implements ElementaryOperator

This source takes as input a Java Collection.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

OperatorBase.GsonSerializer

Field Summary

Fields

Modifier and Type	Field	Description
protected final Collection<T>	collection

Fields inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

inputSlots, outputSlots, STANDARD_OPERATOR_ARGS

Fields inherited from interface org.apache.wayang.core.plan.wayangplan.Operator

FIRST_EPOCH

Constructor Summary

Constructors

Constructor	Description
CollectionSource(Collection<T> collection, Class<T> typeClass)
CollectionSource(Collection<T> collection, DataSetType<T> type)
CollectionSource(CollectionSource that)	Copies an instance (exclusive of broadcasts).

Method Summary

Modifier and Type	Method	Description
Optional<CardinalityEstimator>	createCardinalityEstimator(int outputIndex, Configuration configuration)	Provide a CardinalityEstimator for the OutputSlot at outputIndex.
static <T> CollectionSource<T>	empty(Class<T> typeClass)	Creates a new instance without any data quanta.
Collection<T>	getCollection()
static <T> CollectionSource<T>	singleton(T value, Class<T> typeClass)	Creates a new instance without any data quanta.

Methods inherited from class org.apache.wayang.core.plan.wayangplan.UnarySource

getOutput, getType

Methods inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

accept, addBroadcastInput, addTargetPlatform, at, collectMappedInputSlots, collectMappedOutputSlots, copy, createCopy, getAllInputs, getAllOutputs, getCardinalityEstimator, getContainer, getEpoch, getName, getOriginal, getSimpleClassName, getTargetPlatforms, isAuxiliary, isSupportingBroadcastInputs, propagateInputCardinality, propagateOutputCardinality, setAuxiliary, setCardinalityEstimator, setContainer, setEpoch, setName, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ActualOperator

accept

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ElementaryOperator

getCardinalityEstimator, isAuxiliary, setAuxiliary, setCardinalityEstimator

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.Operator

addBroadcastInput, addTargetPlatform, broadcastTo, broadcastTo, collectMappedInputSlots, collectMappedOutputSlots, connectTo, connectTo, getAllInputs, getAllOutputs, getCardinalityPusher, getContainer, getEffectiveOccupant, getEffectiveOccupant, getEpoch, getEstimationContextProperties, getForwards, getInnermostLoop, getInput, getInput, getLoopStack, getName, getNumBroadcastInputs, getNumInputs, getNumOutputs, getNumRegularInputs, getOuterInputSlot, getOutermostInputSlot, getOutermostOutputSlots, getOutput, getOutput, getParent, getTargetPlatforms, isAlternative, isConversion, isElementary, isExecutionOperator, isFeedbackInput, isFeedforwardOutput, isLoopHead, isLoopSubplan, isOwnerOf, isReading, isSink, isSource, isSubplan, isSupportingBroadcastInputs, isUnconnected, propagateInputCardinality, propagateOutputCardinality, propagateOutputCardinality, replaceWith, setContainer, setEpoch, setInput, setName, setOutput

Field Details

collection

protected final Collection<T> collection

Constructor Details

CollectionSource

public CollectionSource(Collection<T> collection,
 Class<T> typeClass)

CollectionSource

public CollectionSource(Collection<T> collection,
 DataSetType<T> type)

CollectionSource

public CollectionSource(CollectionSource that)

Copies an instance (exclusive of broadcasts).

Parameters:

that - that should be copied

Method Details

getCollection

public Collection<T> getCollection()

createCardinalityEstimator

public Optional<CardinalityEstimator> createCardinalityEstimator(int outputIndex,
 Configuration configuration)

Description copied from interface: ElementaryOperator

Provide a CardinalityEstimator for the OutputSlot at outputIndex.

Specified by:

createCardinalityEstimator in interface ElementaryOperator

Parameters:

outputIndex - index of the OutputSlot for that the CardinalityEstimator is requested

configuration - if the CardinalityEstimator depends on further ones, use this to obtain the latter

Returns:

an Optional that might provide the requested instance

empty

public static <T> CollectionSource<T> empty(Class<T> typeClass)

Creates a new instance without any data quanta.

singleton

public static <T> CollectionSource<T> singleton(T value,
 Class<T> typeClass)

Creates a new instance without any data quanta.