com.tinkerpop.gremlin.process.graph.step.sideEffect

Class CountStep<S>

java.lang.Object

com.tinkerpop.gremlin.process.util.AbstractStep<S,java.lang.Long>

com.tinkerpop.gremlin.process.graph.step.sideEffect.CountStep<S>

All Implemented Interfaces:

MapReducer<MapReduce.NullObject,java.lang.Long,MapReduce.NullObject,java.lang.Long,java.lang.Long>, SideEffectCapable, Step<S,java.lang.Long>, java.lang.Cloneable, java.util.Iterator<Traverser<java.lang.Long>>

public final class CountStep<S>
extends AbstractStep<S,java.lang.Long>
implements SideEffectCapable, MapReducer<MapReduce.NullObject,java.lang.Long,MapReduce.NullObject,java.lang.Long,java.lang.Long>

Author:

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

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	COUNT_KEY

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
CountStep(Traversal traversal)

Method Summary

Modifier and Type	Method and Description
MapReduce<MapReduce.NullObject,java.lang.Long,MapReduce.NullObject,java.lang.Long,java.lang.Long>	getMapReduce()
java.util.Set<TraverserRequirement>	getRequirements() Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly.
java.lang.String	getSideEffectKey()
Traverser<java.lang.Long>	processNextStart()
void	reset() Reset the state of the step such that it has no incoming starts.

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

addStart, addStarts, clone, getId, getLabel, getNextStep, getPreviousStep, getTraversal, hasNext, next, setId, setLabel, setNextStep, setPreviousStep, setTraversal, toString

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

COUNT_KEY

public static final java.lang.String COUNT_KEY

Constructor Detail

CountStep

public CountStep(Traversal traversal)

Method Detail

processNextStart

public Traverser<java.lang.Long> processNextStart()

Specified by:

processNextStart in class AbstractStep<S,java.lang.Long>

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.lang.Long>

Overrides:

reset in class AbstractStep<S,java.lang.Long>

getSideEffectKey

public java.lang.String getSideEffectKey()

Specified by:

getSideEffectKey in interface SideEffectCapable

getMapReduce

public MapReduce<MapReduce.NullObject,java.lang.Long,MapReduce.NullObject,java.lang.Long,java.lang.Long> getMapReduce()

Specified by:

getMapReduce in interface MapReducer<MapReduce.NullObject,java.lang.Long,MapReduce.NullObject,java.lang.Long,java.lang.Long>

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.lang.Long>

Returns:

the set of requirements