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

Class TraversalVertexProgramStep

java.lang.Object

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

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

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

All Implemented Interfaces:

Serializable, Cloneable, Iterator<Traverser.Admin<ComputerResult>>, VertexComputing, Step<ComputerResult,ComputerResult>, TraversalParent

public final class TraversalVertexProgramStep
extends VertexProgramStep
implements TraversalParent

Author:

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

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
PureTraversal<?,?>	computerTraversal

Fields inherited from class org.apache.tinkerpop.gremlin.process.computer.traversal.step.map.VertexProgramStep

computer, first, ROOT_TRAVERSAL, STEP_ID

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
TraversalVertexProgramStep(Traversal.Admin traversal, Traversal.Admin<?,?> computerTraversal)

Method Summary

Modifier and Type	Method and Description
TraversalVertexProgramStep	clone() Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication.
GraphComputer	generateComputer(Graph graph)
TraversalVertexProgram	generateProgram(Graph graph, Memory memory) Generate the VertexProgram.
List<Traversal.Admin<?,?>>	getGlobalChildren()
Set<TraverserRequirement>	getRequirements() Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly.
void	setTraversal(Traversal.Admin<?,?> parentTraversal) Set the Traversal that this step is contained within.
String	toString()

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

getComputer, isEndStep, previousTraversalVertexProgram, processNextStart, setComputer

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

addLabel, addStart, addStarts, equals, getId, getLabels, getNextStep, getPreviousStep, getTraversal, hashCode, hasNext, next, 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, getLocalChildren, getSelfAndChildRequirements, integrateChild, removeGlobalChild, removeLocalChild

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

equals

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Field Detail

computerTraversal

public PureTraversal<?,?> computerTraversal

Constructor Detail

TraversalVertexProgramStep

public TraversalVertexProgramStep(Traversal.Admin traversal,
                                  Traversal.Admin<?,?> computerTraversal)

Method Detail

getGlobalChildren

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

Specified by:

getGlobalChildren in interface TraversalParent

toString

public String toString()

Overrides:

toString in class AbstractStep<ComputerResult,ComputerResult>

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<ComputerResult,ComputerResult>

Returns:

the set of requirements

generateProgram

public TraversalVertexProgram generateProgram(Graph graph,
                                              Memory memory)

Description copied from interface: VertexComputing

Generate the VertexProgram.

Specified by:

generateProgram in interface VertexComputing

Parameters:

graph - the Graph that the program will be executed over.

memory - the Memory from the previous OLAP job if it exists, else its an empty memory structure.

Returns:

the generated vertex program instance.

generateComputer

public GraphComputer generateComputer(Graph graph)

Specified by:

generateComputer in interface VertexComputing

clone

public TraversalVertexProgramStep 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<ComputerResult,ComputerResult>

Overrides:

clone in class AbstractStep<ComputerResult,ComputerResult>

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<ComputerResult,ComputerResult>

Overrides:

setTraversal in class AbstractStep<ComputerResult,ComputerResult>

Parameters:

parentTraversal - the new traversal for this step