Class SumGlobalStep<S extends Number>
- java.lang.Object
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- org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep<S,E>
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- org.apache.tinkerpop.gremlin.process.traversal.step.util.ReducingBarrierStep<S,S>
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- org.apache.tinkerpop.gremlin.process.traversal.step.map.SumGlobalStep<S>
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- All Implemented Interfaces:
Serializable
,Cloneable
,Iterator<Traverser.Admin<S>>
,Step<S,S>
,Barrier<S>
,Generating<S,S>
,MemoryComputing<S>
public final class SumGlobalStep<S extends Number> extends ReducingBarrierStep<S,S>
- Author:
- Marko A. Rodriguez (http://markorodriguez.com)
- See Also:
- Serialized Form
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.ReducingBarrierStep
ReducingBarrierStep.NonEmittingSeed
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Field Summary
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Fields inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.ReducingBarrierStep
hasProcessedOnce, NON_EMITTING_SEED, reducingBiOperator, seedSupplier
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Fields inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep
id, labels, nextEnd, nextStep, previousStep, starts, traversal, traverserStepIdAndLabelsSetByChild
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Constructor Summary
Constructors Constructor Description SumGlobalStep(Traversal.Admin traversal)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected S
generateSeedFromStarts()
Advances the starts until a non-null value is found or simply returnsnull
.Set<TraverserRequirement>
getRequirements()
Provide the necessaryTraverserRequirement
that must be met by the traverser in order for the step to function properly.void
processAllStarts()
Process all left traversers by do not yield the resultant output.S
projectTraverser(Traverser.Admin<S> traverser)
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Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.ReducingBarrierStep
addBarrier, clone, done, getBiOperator, getMemoryComputeKey, getSeedSupplier, hasNextBarrier, nextBarrier, processNextStart, reset, setReducingBiOperator, setSeedSupplier
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Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep
addLabel, addStart, addStarts, clearLabels, equals, getId, getLabels, getNextStep, getPreviousStep, getStarts, getTraversal, hashCode, hasNext, hasStarts, isTraverserStepIdAndLabelsSetByChild, next, prepareTraversalForNextStep, removeLabel, setId, setNextStep, setPreviousStep, setTraversal, toString
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Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.Generating
generateFinalResult
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Methods inherited from interface java.util.Iterator
forEachRemaining, remove
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Constructor Detail
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SumGlobalStep
public SumGlobalStep(Traversal.Admin traversal)
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Method Detail
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generateSeedFromStarts
protected S generateSeedFromStarts()
Advances the starts until a non-null value is found or simply returnsnull
. In this way, an allnull
stream will result innull
.- Overrides:
generateSeedFromStarts
in classReducingBarrierStep<S extends Number,S extends Number>
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processAllStarts
public void processAllStarts()
Description copied from interface:Barrier
Process all left traversers by do not yield the resultant output. This method is useful for steps likeReducingBarrierStep
, where traversers can be processed "on the fly" and thus, reduce memory consumption.- Specified by:
processAllStarts
in interfaceBarrier<S extends Number>
- Overrides:
processAllStarts
in classReducingBarrierStep<S extends Number,S extends Number>
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projectTraverser
public S projectTraverser(Traverser.Admin<S> traverser)
- Specified by:
projectTraverser
in classReducingBarrierStep<S extends Number,S extends Number>
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getRequirements
public Set<TraverserRequirement> getRequirements()
Description copied from interface:Step
Provide the necessaryTraverserRequirement
that must be met by the traverser in order for the step to function properly. The provided default implements returns an empty set.- Returns:
- the set of requirements
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