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

Class SelectOneStep<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.SelectOneStep<S,E>

All Implemented Interfaces:

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

public final class SelectOneStep<S,E>
extends MapStep<S,E>
implements TraversalParent, EngineDependent

Author:

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

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
SelectOneStep(Traversal.Admin traversal, String selectLabel)

Method Summary

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

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

processNextStart

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

addStart, addStarts, getId, getLabel, getNextStep, getPreviousStep, getTraversal, hasNext, next, reset, 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, asStep, getGlobalChildren, getSelfAndChildRequirements, integrateChild

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Detail

SelectOneStep

public SelectOneStep(Traversal.Admin traversal,
                     String selectLabel)

Method Detail

map

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

Specified by:

map in class MapStep<S,E>

onEngine

public void onEngine(TraversalEngine traversalEngine)

Specified by:

onEngine in interface EngineDependent

toString

public String toString()

Overrides:

toString in class AbstractStep<S,E>

clone

public SelectOneStep<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

getLocalChildren

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

Specified by:

getLocalChildren in interface TraversalParent

addLocalChild

public void addLocalChild(Traversal.Admin<?,?> selectTraversal)

Specified by:

addLocalChild 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>

Overrides:

getRequirements in class MapStep<S,E>

Returns:

the set of requirements