com.tinkerpop.gremlin.process.graph.step.map

Class SelectStep<S,E>

java.lang.Object

com.tinkerpop.gremlin.process.util.AbstractStep<S,E>

com.tinkerpop.gremlin.process.graph.step.map.MapStep<S,java.util.Map<java.lang.String,E>>

com.tinkerpop.gremlin.process.graph.step.map.SelectStep<S,E>

All Implemented Interfaces:

EngineDependent, FunctionHolder<java.lang.Object,java.lang.Object>, Step<S,java.util.Map<java.lang.String,E>>, java.lang.Cloneable, java.util.Iterator<Traverser<java.util.Map<java.lang.String,E>>>

Direct Known Subclasses:

SelectOneStep

public class SelectStep<S,E>
extends MapStep<S,java.util.Map<java.lang.String,E>>
implements FunctionHolder<java.lang.Object,java.lang.Object>, EngineDependent

Author:

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

Field Summary

Fields

Modifier and Type	Field and Description
protected FunctionRing<java.lang.Object,java.lang.Object>	functionRing
protected java.util.function.Function<Traverser<S>,java.util.Map<java.lang.String,E>>	selectFunction

Fields inherited from class com.tinkerpop.gremlin.process.util.AbstractStep

id, label, nextEnd, nextStep, previousStep, PROFILING_ENABLED, starts, traversal, traverserStepIdSetByChild

Constructor Summary

Constructors

Constructor and Description
SelectStep(Traversal traversal, java.lang.String... selectLabels)

Method Summary

Modifier and Type	Method and Description
void	addFunction(java.util.function.Function<java.lang.Object,java.lang.Object> function)
SelectStep<S,E>	clone() Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication.
java.util.List<java.util.function.Function<java.lang.Object,java.lang.Object>>	getFunctions()
java.util.Set<TraverserRequirement>	getRequirements() Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly.
boolean	hasStepFunctions()
void	onEngine(TraversalEngine traversalEngine)
void	reset() Reset the state of the step such that it has no incoming starts.
java.lang.String	toString()

Methods inherited from class com.tinkerpop.gremlin.process.graph.step.map.MapStep

processNextStart, setFunction

Methods inherited from class com.tinkerpop.gremlin.process.util.AbstractStep

addStart, addStarts, getId, getLabel, getNextStep, getPreviousStep, getTraversal, hasNext, next, 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 java.util.Iterator

forEachRemaining, remove

Field Detail

functionRing

protected FunctionRing<java.lang.Object,java.lang.Object> functionRing

selectFunction

protected java.util.function.Function<Traverser<S>,java.util.Map<java.lang.String,E>> selectFunction

Constructor Detail

SelectStep

public SelectStep(Traversal traversal,
                  java.lang.String... selectLabels)

Method Detail

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<S,java.util.Map<java.lang.String,E>>

Overrides:

reset in class AbstractStep<S,java.util.Map<java.lang.String,E>>

hasStepFunctions

public boolean hasStepFunctions()

onEngine

public void onEngine(TraversalEngine traversalEngine)

Specified by:

onEngine in interface EngineDependent

toString

public java.lang.String toString()

Overrides:

toString in class AbstractStep<S,java.util.Map<java.lang.String,E>>

clone

public SelectStep<S,E> clone()
                      throws java.lang.CloneNotSupportedException

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,java.util.Map<java.lang.String,E>>

Overrides:

clone in class AbstractStep<S,java.util.Map<java.lang.String,E>>

Returns:

The cloned step

Throws:

java.lang.CloneNotSupportedException

addFunction

public void addFunction(java.util.function.Function<java.lang.Object,java.lang.Object> function)

Specified by:

addFunction in interface FunctionHolder<java.lang.Object,java.lang.Object>

getFunctions

public java.util.List<java.util.function.Function<java.lang.Object,java.lang.Object>> getFunctions()

Specified by:

getFunctions in interface FunctionHolder<java.lang.Object,java.lang.Object>

getRequirements

public java.util.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,java.util.Map<java.lang.String,E>>

Overrides:

getRequirements in class MapStep<S,java.util.Map<java.lang.String,E>>

Returns:

the set of requirements