Package org.apache.tinkerpop.gremlin.process.traversal.step.map

Class MergeStep<S,E>

java.lang.Object

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

org.apache.tinkerpop.gremlin.process.traversal.step.map.MapStep<S,E>

org.apache.tinkerpop.gremlin.process.traversal.step.map.ScalarMapStep<S,E>

org.apache.tinkerpop.gremlin.process.traversal.step.map.MergeStep<S,E>

All Implemented Interfaces:

Serializable, AutoCloseable, Cloneable, Iterator<Traverser.Admin<E>>, Step<S,E>, TraversalParent, ListFunction

public final class MergeStep<S,E>
extends ScalarMapStep<S,E>
implements TraversalParent, ListFunction

A map step that returns the merger of the traverser and the provided arguments without duplicates. This is commonly known as a union.

See Also:

Serialized Form

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	Description
MergeStep(Traversal.Admin traversal, Object values)

Method Summary

Modifier and Type	Method	Description
MergeStep<S,E>	clone()	Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication.
List<Traversal.Admin<S,E>>	getLocalChildren()
Object	getParameterItems()
GValue<Object>	getParameterItemsGValue()
Set<TraverserRequirement>	getRequirements()	Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly.
String	getStepName()	Template method used for retrieving the implementing Step's name.
Traversal.Admin<S,E>	getValueTraversal()
int	hashCode()
protected E	map(Traverser.Admin<S> traverser)
void	setTraversal(Traversal.Admin<?,?> parentTraversal)	Set the Traversal that this step is contained within.

Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.map.ScalarMapStep

processNextStart

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

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.util.ListFunction

convertArgumentToCollection, convertArgumentToSet, convertTraversalToCollection, convertTraversalToSet, convertTraverserToCollection, convertTraverserToSet

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

equals

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

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

Constructor Detail

MergeStep

public MergeStep(Traversal.Admin traversal,
                 Object values)

Method Detail

getValueTraversal

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

getParameterItems

public Object getParameterItems()

getParameterItemsGValue

public GValue<Object> getParameterItemsGValue()

getStepName

public String getStepName()

Description copied from interface: ListFunction

Template method used for retrieving the implementing Step's name.

Specified by:

getStepName in interface ListFunction

Returns:

this step's name.

map

protected E map(Traverser.Admin<S> traverser)

Specified by:

map in class ScalarMapStep<S,E>

getLocalChildren

public List<Traversal.Admin<S,E>> 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,E>

Returns:

the set of requirements

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,E>

Overrides:

setTraversal in class AbstractStep<S,E>

Parameters:

parentTraversal - the new traversal for this step

clone

public MergeStep<S,E> 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,E>

Overrides:

clone in class AbstractStep<S,E>

Returns:

The cloned step

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractStep<S,E>