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

Class VertexStep<E extends Element>

java.lang.Object

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

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

org.apache.tinkerpop.gremlin.process.traversal.step.map.VertexStep<E>

All Implemented Interfaces:

Serializable, AutoCloseable, Cloneable, Iterator<Traverser.Admin<E>>, Step<Vertex,E>, Configuring, VertexStepContract<E>, Parameterizing

public class VertexStep<E extends Element>
extends FlatMapStep<Vertex,E>
implements VertexStepContract<E>

Handles the logic of traversing to adjacent vertices or edges given a direction and edge labels for steps like, out, in, both, outE, inE, and bothE.

Author:

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

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Parameters	parameters

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

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

Fields inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.map.VertexStepContract

CONCRETE_STEPS

Constructor Summary

Constructors

Constructor	Description
VertexStep(Traversal.Admin traversal, Class<E> returnClass, Direction direction, String... edgeLabels)

Method Summary

Modifier and Type	Method	Description
void	close()
void	configure(Object... keyValues)	Accept a configuration to the Step.
protected Iterator<E>	flatMap(Traverser.Admin<Vertex> traverser)
Direction	getDirection()
String[]	getEdgeLabels()
Parameters	getParameters()	Gets the parameters on the step.
Set<TraverserRequirement>	getRequirements()	Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly.
Class<E>	getReturnClass()
int	hashCode()
boolean	returnsEdge()	Determines if the step returns edges.
boolean	returnsVertex()	Determines if the step returns vertices.
void	reverseDirection()
String	toString()

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

closeIterator, processNextStart, reset

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

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, hasNext, next, remove

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

addLabel, addStart, addStarts, clearLabels, clone, equals, getId, getLabels, getNextStep, getPreviousStep, getTraversal, hasStarts, removeLabel, reset, setId, setNextStep, setPreviousStep, setTraversal

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

getEdgeLabelsAsGValues

Field Details

parameters

protected Parameters parameters

Constructor Details

VertexStep

public VertexStep(Traversal.Admin traversal,
 Class<E> returnClass,
 Direction direction,
 String... edgeLabels)

Method Details

getParameters

public Parameters getParameters()

Description copied from interface: Parameterizing

Gets the parameters on the step.

Specified by:

getParameters in interface Parameterizing

configure

public void configure(Object... keyValues)

Description copied from interface: Configuring

Accept a configuration to the Step. Note that this interface extends Parameterizing and so there is an expectation that the Step implementation will have a Parameters instance that will house any values passed to this method. Storing these configurations in Parameters is not a requirement however, IF the configuration is an expected option for the step and can be stored on a member field that can be accessed on the step by more direct means (i.e. like a getter method).

Specified by:

configure in interface Configuring

flatMap

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

Specified by:

flatMap in class FlatMapStep<Vertex,E extends Element>

getDirection

public Direction getDirection()

Specified by:

getDirection in interface VertexStepContract<E extends Element>

getEdgeLabels

public String[] getEdgeLabels()

Specified by:

getEdgeLabels in interface VertexStepContract<E extends Element>

getReturnClass

public Class<E> getReturnClass()

Specified by:

getReturnClass in interface VertexStepContract<E extends Element>

reverseDirection

public void reverseDirection()

Specified by:

reverseDirection in interface VertexStepContract<E extends Element>

returnsVertex

public boolean returnsVertex()

Determines if the step returns vertices.

Specified by:

returnsVertex in interface VertexStepContract<E extends Element>

returnsEdge

public boolean returnsEdge()

Determines if the step returns edges.

Specified by:

returnsEdge in interface VertexStepContract<E extends Element>

toString

public String toString()

Overrides:

toString in class AbstractStep<Vertex,E extends Element>

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractStep<Vertex,E extends Element>

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<Vertex,E extends Element>

Specified by:

getRequirements in interface VertexStepContract<E extends Element>

Returns:

the set of requirements

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception