Package 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, AutoCloseable, Cloneable, Iterator<Traverser.Admin<ComputerResult>>, VertexComputing, Step<ComputerResult,ComputerResult>, PopContaining, TraversalParent

public final class TraversalVertexProgramStep
extends VertexProgramStep
implements TraversalParent

Author:

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

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.PopContaining

PopContaining.PopInstruction

Field Summary

Fields

Modifier and Type	Field	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	Description
TraversalVertexProgramStep(Traversal.Admin traversal, Traversal.Admin<?,?> computerTraversal)

Method Summary

Modifier and Type	Method	Description
TraversalVertexProgramStep	clone()	Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication.
TraversalVertexProgram	generateProgram(Graph graph, Memory memory)	Generate the VertexProgram.
List<Traversal.Admin<?,?>>	getGlobalChildren()	Gets a list of all "global" child traversals for this step.
Set<TraverserRequirement>	getRequirements()	Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly.
void	setComputerTraversal(Traversal.Admin<?,?> computerTraversal)
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, clearLabels, equals, getId, getLabels, getNextStep, getPreviousStep, getStarts, getTraversal, hashCode, hasNext, hasStarts, isTraverserStepIdAndLabelsSetByChild, next, prepareTraversalForNextStep, removeLabel, reset, setId, setNextStep, setPreviousStep

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.Step

equals

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

addGlobalChild, addLocalChild, asStep, close, getLocalChildren, getPopInstructions, getSelfAndChildRequirements, integrateChild, removeGlobalChild, removeLocalChild, replaceLocalChild

Field Details

computerTraversal

public PureTraversal<?,?> computerTraversal

Constructor Details

TraversalVertexProgramStep

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

Method Details

getGlobalChildren

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

Description copied from interface: TraversalParent

Gets a list of all "global" child traversals for this step. A "global" traversal is one which evaluates across all of its parents incoming traversers at once. This is typically used in cases where the child traversal represents a branch of traversal flow. See BranchStep as an example.

Specified by:

getGlobalChildren in interface TraversalParent

setComputerTraversal

public void setComputerTraversal(Traversal.Admin<?,?> computerTraversal)

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.

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 Step.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