Package org.apache.tinkerpop.gremlin.process.traversal.traverser.util

Class DummyTraverser<T>

java.lang.Object

org.apache.tinkerpop.gremlin.process.traversal.traverser.util.EmptyTraverser<T>

org.apache.tinkerpop.gremlin.process.traversal.traverser.util.DummyTraverser<T>

All Implemented Interfaces:

Serializable, Cloneable, Comparable<Traverser<T>>, Traverser<T>, Traverser.Admin<T>, Attachable<T>

public final class DummyTraverser<T>
extends EmptyTraverser<T>

Similar to the EmptyTraverser, except the DummyTraverser can split. When it splits it generates an entirely new traverser using its supplied TraverserGenerator, leaving no trace of the initial DummyTraverser in the path. Useful for seeding nested traversals inside of start steps.

Author:

Mike Personick (http://github.com/mikepersonick)

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.tinkerpop.gremlin.structure.util.Attachable

Attachable.Exceptions, Attachable.Method

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

Traverser.Admin<T>

Field Summary

Fields inherited from interface org.apache.tinkerpop.gremlin.structure.util.Attachable

logger

Fields inherited from interface org.apache.tinkerpop.gremlin.process.traversal.Traverser.Admin

HALT

Constructor Summary

Constructors

Constructor	Description
DummyTraverser(TraverserGenerator generator)

Method Summary

Modifier and Type	Method	Description
DummyTraverser<T>	clone()	Traverser cloning is important when splitting a traverser at a bifurcation point in a traversal.
boolean	equals(Object object)
TraversalSideEffects	getSideEffects()	Get the sideEffects associated with the traversal of the traverser.
void	setSideEffects(TraversalSideEffects sideEffects)	Set the sideEffects of the Traversal.
<R> Traverser.Admin<R>	split(R r, Step<T,R> step)	Generate a child traverser of the current traverser for current as step and new object location.

Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.traverser.util.EmptyTraverser

addLabels, attach, bulk, detach, dropLabels, dropPath, get, getStepId, getTags, hashCode, incrLoops, initialiseLoops, instance, keepLabels, loops, loops, merge, path, resetLoops, sack, sack, set, setBulk, setStepId, split

Methods inherited from class java.lang.Object

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

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

asAdmin, compareTo, path, path, sideEffects, sideEffects

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

getLoopNames, isHalted

Constructor Detail

DummyTraverser

public DummyTraverser(TraverserGenerator generator)

Method Detail

split

public <R> Traverser.Admin<R> split(R r,
                                    Step<T,R> step)

Description copied from interface: Traverser.Admin

Generate a child traverser of the current traverser for current as step and new object location. The child has the path history, future, and loop information of the parent. The child extends that path history with the current as and provided R-object.

Specified by:

split in interface Traverser.Admin<T>

Overrides:

split in class EmptyTraverser<T>

Type Parameters:

R - The current object type of the child

Parameters:

r - The current object of the child

step - The step yielding the split

Returns:

The split traverser

setSideEffects

public void setSideEffects(TraversalSideEffects sideEffects)

Description copied from interface: Traverser.Admin

Set the sideEffects of the Traversal. Given that traversers can move between machines, it may be important to re-set this when the traverser crosses machine boundaries.

Specified by:

setSideEffects in interface Traverser.Admin<T>

Overrides:

setSideEffects in class EmptyTraverser<T>

Parameters:

sideEffects - the sideEffects of the traversal.

getSideEffects

public TraversalSideEffects getSideEffects()

Description copied from interface: Traverser.Admin

Get the sideEffects associated with the traversal of the traverser.

Specified by:

getSideEffects in interface Traverser.Admin<T>

Overrides:

getSideEffects in class EmptyTraverser<T>

Returns:

the traversal sideEffects of the traverser

equals

public boolean equals(Object object)

Overrides:

equals in class EmptyTraverser<T>

clone

public DummyTraverser<T> clone()

Description copied from interface: Traverser

Traverser cloning is important when splitting a traverser at a bifurcation point in a traversal.

Specified by:

clone in interface Traverser<T>

Overrides:

clone in class EmptyTraverser<T>