org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect

Class GroupSideEffectStep<S,K,V>

java.lang.Object

org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep<S,S>

org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.SideEffectStep<S>

org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.GroupSideEffectStep<S,K,V>

All Implemented Interfaces:

Serializable, AutoCloseable, Cloneable, Iterator<Traverser.Admin<S>>, Step<S,S>, ByModulating, Generating<Map<K,?>,Map<K,V>>, Grouping<S,K,V>, ProfilingAware, SideEffectCapable<Map<K,?>,Map<K,V>>, TraversalParent

public final class GroupSideEffectStep<S,K,V>
extends SideEffectStep<S>
implements SideEffectCapable<Map<K,?>,Map<K,V>>, TraversalParent, ByModulating, ProfilingAware, Grouping<S,K,V>

Author:

Marko A. Rodriguez (http://markorodriguez.com)

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.ProfilingAware

ProfilingAware.ProfiledBarrier

Field Summary

Fields inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep

id, labels, nextEnd, nextStep, previousStep, starts, traversal, traverserStepIdAndLabelsSetByChild

Constructor Summary

Constructors

Constructor and Description
GroupSideEffectStep(Traversal.Admin traversal, String sideEffectKey)

Method Summary

Modifier and Type	Method and Description
GroupSideEffectStep<S,K,V>	clone() Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication.
Map<K,V>	generateFinalResult(Map<K,?> object) Post-process the side-effect and return the post-processed side-effect.
Traversal.Admin<S,K>	getKeyTraversal() Determines if the provided traversal is equal to the key traversal that the Grouping has.
List<Traversal.Admin<?,?>>	getLocalChildren()
Set<TraverserRequirement>	getRequirements() Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly.
String	getSideEffectKey() The side-effect key of the step.
Traversal.Admin<S,V>	getValueTraversal() Determines if the provided traversal is equal to the value traversal that the Grouping has.
int	hashCode()
void	modulateBy(Traversal.Admin<?,?> kvTraversal)
void	prepareForProfiling() Reset the Barrier on the step to be wrapped in a ProfilingAware.ProfiledBarrier which can properly start/stop the timer on the associated ProfileStep.
void	replaceLocalChild(Traversal.Admin<?,?> oldTraversal, Traversal.Admin<?,?> newTraversal)
void	setTraversal(Traversal.Admin<?,?> parentTraversal) Set the Traversal that this step is contained within.
protected void	sideEffect(Traverser.Admin<S> traverser)
String	toString()

Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.SideEffectStep

processNextStart

Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep

addLabel, addStart, addStarts, equals, getId, getLabels, getNextStep, getPreviousStep, getStarts, getTraversal, hasNext, hasStarts, isTraverserStepIdAndLabelsSetByChild, next, prepareTraversalForNextStep, removeLabel, reset, setId, setNextStep, setPreviousStep

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.TraversalParent

addGlobalChild, addLocalChild, asStep, close, getGlobalChildren, getSelfAndChildRequirements, integrateChild, removeGlobalChild, removeLocalChild

Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.ByModulating

modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy

Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.Grouping

convertValueTraversal, determineBarrierStep, doFinalReduction

Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.Step

equals

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Detail

GroupSideEffectStep

public GroupSideEffectStep(Traversal.Admin traversal,
                           String sideEffectKey)

Method Detail

prepareForProfiling

public void prepareForProfiling()

Reset the Barrier on the step to be wrapped in a ProfilingAware.ProfiledBarrier which can properly start/stop the timer on the associated ProfileStep.

Specified by:

prepareForProfiling in interface ProfilingAware

getKeyTraversal

public Traversal.Admin<S,K> getKeyTraversal()

Description copied from interface: Grouping

Determines if the provided traversal is equal to the key traversal that the Grouping has.

Specified by:

getKeyTraversal in interface Grouping<S,K,V>

getValueTraversal

public Traversal.Admin<S,V> getValueTraversal()

Description copied from interface: Grouping

Determines if the provided traversal is equal to the value traversal that the Grouping has.

Specified by:

getValueTraversal in interface Grouping<S,K,V>

modulateBy

public void modulateBy(Traversal.Admin<?,?> kvTraversal)

Specified by:

modulateBy in interface ByModulating

replaceLocalChild

public void replaceLocalChild(Traversal.Admin<?,?> oldTraversal,
                              Traversal.Admin<?,?> newTraversal)

Specified by:

replaceLocalChild in interface TraversalParent

sideEffect

protected void sideEffect(Traverser.Admin<S> traverser)

Specified by:

sideEffect in class SideEffectStep<S>

getSideEffectKey

public String getSideEffectKey()

Description copied from interface: SideEffectCapable

The side-effect key of the step.

Specified by:

getSideEffectKey in interface SideEffectCapable<Map<K,?>,Map<K,V>>

Returns:

the side-effect key

toString

public String toString()

Overrides:

toString in class AbstractStep<S,S>

getLocalChildren

public List<Traversal.Admin<?,?>> getLocalChildren()

Specified by:

getLocalChildren in interface TraversalParent

getRequirements

public Set<TraverserRequirement> getRequirements()

Description copied from interface: Step

Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly. The provided default implements returns an empty set.

Specified by:

getRequirements in interface Step<S,S>

Returns:

the set of requirements

clone

public GroupSideEffectStep<S,K,V> clone()

Description copied from interface: Step

Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication. When cloning a step, it is important that the steps, the cloned step is equivalent to the state of the step when Step.reset() is called. Moreover, the previous and next steps should be set to EmptyStep.

Specified by:

clone in interface Step<S,S>

Overrides:

clone in class AbstractStep<S,S>

Returns:

The cloned step

setTraversal

public void setTraversal(Traversal.Admin<?,?> parentTraversal)

Description copied from interface: Step

Set the Traversal that this step is contained within.

Specified by:

setTraversal in interface Step<S,S>

Overrides:

setTraversal in class AbstractStep<S,S>

Parameters:

parentTraversal - the new traversal for this step

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractStep<S,S>

generateFinalResult

public Map<K,V> generateFinalResult(Map<K,?> object)

Description copied from interface: Generating

Post-process the side-effect and return the post-processed side-effect. The default implementation is simply the identity function and returns the argument.

Specified by:

generateFinalResult in interface Generating<Map<K,?>,Map<K,V>>

Parameters:

object - the pre-processed side-effect.

Returns:

the post-processed side-effect.