Package org.apache.tinkerpop.gremlin.process.traversal.lambda

Class ValueTraversal<T,V>

java.lang.Object

org.apache.tinkerpop.gremlin.process.traversal.lambda.AbstractLambdaTraversal<T,V>

org.apache.tinkerpop.gremlin.process.traversal.lambda.ValueTraversal<T,V>

All Implemented Interfaces:

Serializable, AutoCloseable, Cloneable, Iterator<V>, Traversal<T,V>, Traversal.Admin<T,V>

public final class ValueTraversal<T,V>
extends AbstractLambdaTraversal<T,V>

More efficiently extracts a value from an Element or Map to avoid strategy application costs.

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.Traversal

Traversal.Admin<S,E>, Traversal.Exceptions, Traversal.Symbols

Field Summary

Fields inherited from class org.apache.tinkerpop.gremlin.process.traversal.lambda.AbstractLambdaTraversal

bypassTraversal, gValueManager

Constructor Summary

Constructors

Constructor	Description
ValueTraversal(String propertyKey)	Creates an instance for the specified propertyKey.
ValueTraversal(String propertyKey, Traversal.Admin<T,V> bypassTraversal)	Creates an instance with the bypassTraversal set on construction.

Method Summary

Modifier and Type	Method	Description
void	addStart(Traverser.Admin<T> start)	Add a single Traverser.Admin object to the head of the traversal.
boolean	equals(Object other)
String	getPropertyKey()
V	getValue()	Gets the value of the Traversal which will be null until addStart(Traverser.Admin) is called.
int	hashCode()
boolean	hasNext()	If there is a "start" traverser this method will return true and otherwise false and in either case will always return as such, irrespective of calls to next().
boolean	isNoStarts()	Determines if there is a value to iterate from the Traversal.
V	next()	Return the value of the traverser and will continue to return it on subsequent calls.
void	reset()	Call the Step.reset() method on every step in the traversal.
String	toString()

Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.lambda.AbstractLambdaTraversal

addStep, applyStrategies, clone, getBypassTraversal, getGraph, getGremlinLang, getGValueManager, getParent, getSideEffects, getSteps, getStrategies, getTraverserGenerator, getTraverserRequirements, isLocked, isRoot, lock, nextTraverser, removeStep, setBypassTraversal, setGraph, setGValueManager, setParent, setSideEffects, setStrategies

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Iterator

remove

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

asAdmin, close, discard, explain, fill, forEachRemaining, forEachRemaining, iterate, next, notifyClose, profile, promise, toBulkSet, toList, toSet, toStream, tryNext

Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin

addStarts, addStep, equals, getEndStep, getStartStep, getTraversalSource, getTraverserSetSupplier, removeStep

Constructor Details

ValueTraversal

public ValueTraversal(String propertyKey)

Creates an instance for the specified propertyKey.

ValueTraversal

public ValueTraversal(String propertyKey,
 Traversal.Admin<T,V> bypassTraversal)

Creates an instance with the bypassTraversal set on construction.

Method Details

getValue

public V getValue()

Gets the value of the Traversal which will be null until addStart(Traverser.Admin) is called.

isNoStarts

public boolean isNoStarts()

Determines if there is a value to iterate from the Traversal.

next

public V next()

Return the value of the traverser and will continue to return it on subsequent calls. Calling methods should account for this behavior on their own.

Specified by:

next in interface Iterator<T>

Overrides:

next in class AbstractLambdaTraversal<T,V>

hasNext

public boolean hasNext()

If there is a "start" traverser this method will return true and otherwise false and in either case will always return as such, irrespective of calls to next(). Calling methods should account for this behavior on their own.

Specified by:

hasNext in interface Iterator<T>

Overrides:

hasNext in class AbstractLambdaTraversal<T,V>

addStart

public void addStart(Traverser.Admin<T> start)

Description copied from interface: Traversal.Admin

Add a single Traverser.Admin object to the head of the traversal. Users should typically not need to call this method. For dynamic inject of data, they should use InjectStep.

Specified by:

addStart in interface Traversal.Admin<T,V>

Overrides:

addStart in class AbstractLambdaTraversal<T,V>

Parameters:

start - a traverser to add to the traversal

getPropertyKey

public String getPropertyKey()

reset

public void reset()

Description copied from interface: Traversal.Admin

Call the Step.reset() method on every step in the traversal.

Specified by:

reset in interface Traversal.Admin<T,V>

Overrides:

reset in class AbstractLambdaTraversal<T,V>

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractLambdaTraversal<T,V>

equals

public boolean equals(Object other)

Overrides:

equals in class AbstractLambdaTraversal<T,V>