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

Class CoalesceStep<S,E>

java.lang.Object

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

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

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

All Implemented Interfaces:

Serializable, Cloneable, Iterator<Traverser<E>>, Step<S,E>, TraversalParent

public final class CoalesceStep<S,E>
extends FlatMapStep<S,E>
implements TraversalParent

Author:

Daniel Kuppitz (http://gremlin.guru)

See Also:

Serialized Form

Field Summary

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

id, label, nextEnd, nextStep, previousStep, starts, traversal, traverserStepIdSetByChild

Constructor Summary

Constructors

Constructor and Description
CoalesceStep(Traversal.Admin traversal, Traversal.Admin<S,E>... coalesceTraversals)

Method Summary

Modifier and Type	Method and Description
CoalesceStep<S,E>	clone() Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication.
protected Iterator<E>	flatMap(Traverser.Admin<S> traverser)
List<Traversal.Admin<S,E>>	getLocalChildren()
Set<TraverserRequirement>	getRequirements() Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly.
String	toString()

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

processNextStart, reset

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

addStart, addStarts, getId, getLabel, getNextStep, getPreviousStep, getTraversal, hasNext, next, setId, setLabel, setNextStep, setPreviousStep, setTraversal

Methods inherited from class java.lang.Object

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

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

addGlobalChild, addLocalChild, asStep, getGlobalChildren, getSelfAndChildRequirements, integrateChild

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Detail

CoalesceStep

@SafeVarargs
public CoalesceStep(Traversal.Admin traversal,
                                 Traversal.Admin<S,E>... coalesceTraversals)

Method Detail

flatMap

protected Iterator<E> flatMap(Traverser.Admin<S> traverser)

Specified by:

flatMap in class FlatMapStep<S,E>

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

getLocalChildren

public List<Traversal.Admin<S,E>> getLocalChildren()

Specified by:

getLocalChildren in interface TraversalParent

clone

public CoalesceStep<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 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

toString

public String toString()

Overrides:

toString in class AbstractStep<S,E>