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

Class AddVertexStartStep

java.lang.Object

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

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

All Implemented Interfaces:

Serializable, AutoCloseable, Cloneable, Iterator<Traverser.Admin<Vertex>>, Step<Vertex,Vertex>, Configuring, Mutating<Event.VertexAddedEvent>, Parameterizing, Scoping, TraversalParent

public class AddVertexStartStep
extends AbstractStep<Vertex,Vertex>
implements Mutating<Event.VertexAddedEvent>, TraversalParent, Scoping

Author:

Marko A. Rodriguez (http://markorodriguez.com), Stephen Mallette (http://stephen.genoprime.com)

See Also:

Serialized Form

Nested Class Summary

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

Scoping.KeyNotFoundException, Scoping.Variable

Field Summary

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
AddVertexStartStep(Traversal.Admin traversal, String label)
AddVertexStartStep(Traversal.Admin traversal, Traversal<?,String> vertexLabelTraversal)

Method Summary

Modifier and Type	Method and Description
AddVertexStartStep	clone() Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication.
void	configure(Object... keyValues) Accept a configuration to the Step.
<S,E> List<Traversal.Admin<S,E>>	getLocalChildren()
CallbackRegistry<Event.VertexAddedEvent>	getMutatingCallbackRegistry() Gets the callback registry for events that the step raises.
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.
Set<String>	getScopeKeys() Get the labels that this scoping step will access during the traversal
int	hashCode()
protected Traverser.Admin<Vertex>	processNextStart()
void	reset() Reset the state of the step such that it has no incoming starts.
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.traversal.step.util.AbstractStep

addLabel, addStart, addStarts, equals, getId, getLabels, getNextStep, getPreviousStep, getStarts, getTraversal, hasNext, hasStarts, isTraverserStepIdAndLabelsSetByChild, next, prepareTraversalForNextStep, removeLabel, 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, close, getGlobalChildren, getSelfAndChildRequirements, integrateChild, removeGlobalChild, removeLocalChild, replaceLocalChild

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

getNullableScopeValue, getSafeScopeValue, getScopeValue

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

equals

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Detail

AddVertexStartStep

public AddVertexStartStep(Traversal.Admin traversal,
                          String label)

AddVertexStartStep

public AddVertexStartStep(Traversal.Admin traversal,
                          Traversal<?,String> vertexLabelTraversal)

Method Detail

getParameters

public Parameters getParameters()

Description copied from interface: Parameterizing

Gets the parameters on the step.

Specified by:

getParameters in interface Parameterizing

getScopeKeys

public Set<String> getScopeKeys()

Description copied from interface: Scoping

Get the labels that this scoping step will access during the traversal

Specified by:

getScopeKeys in interface Scoping

Returns:

the accessed labels of the scoping step

getLocalChildren

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

Specified by:

getLocalChildren in interface TraversalParent

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

processNextStart

protected Traverser.Admin<Vertex> processNextStart()

Specified by:

processNextStart in class AbstractStep<Vertex,Vertex>

getMutatingCallbackRegistry

public CallbackRegistry<Event.VertexAddedEvent> getMutatingCallbackRegistry()

Description copied from interface: Mutating

Gets the callback registry for events that the step raises.

Specified by:

getMutatingCallbackRegistry in interface Mutating<Event.VertexAddedEvent>

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,Vertex>

Returns:

the set of requirements

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractStep<Vertex,Vertex>

reset

public void reset()

Description copied from interface: Step

Reset the state of the step such that it has no incoming starts. Internal states are to be reset, but any sideEffect data structures are not to be recreated.

Specified by:

reset in interface Step<Vertex,Vertex>

Overrides:

reset in class AbstractStep<Vertex,Vertex>

toString

public String toString()

Overrides:

toString in class AbstractStep<Vertex,Vertex>

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<Vertex,Vertex>

Overrides:

setTraversal in class AbstractStep<Vertex,Vertex>

Parameters:

parentTraversal - the new traversal for this step

clone

public AddVertexStartStep 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<Vertex,Vertex>

Overrides:

clone in class AbstractStep<Vertex,Vertex>

Returns:

The cloned step