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

Class AbstractLambdaTraversal<S,E>

java.lang.Object

org.apache.tinkerpop.gremlin.process.traversal.lambda.AbstractLambdaTraversal<S,E>

All Implemented Interfaces:

Serializable, Cloneable, Iterator<E>, Traversal<S,E>, Traversal.Admin<S,E>

Direct Known Subclasses:

ConstantTraversal, ElementValueTraversal, IdentityTraversal, LoopTraversal, TokenTraversal, TrueTraversal

public abstract class AbstractLambdaTraversal<S,E>
extends Object
implements Traversal.Admin<S,E>

Author:

Marko A. Rodriguez (http://markorodriguez.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

Constructor Summary

Constructors

Constructor and Description
AbstractLambdaTraversal()

Method Summary

Modifier and Type	Method and Description
void	addStart(Traverser<S> start) Add a single Traverser object to the head of the traversal.
<S2,E2> Traversal.Admin<S2,E2>	addStep(int index, Step<?,?> step) Add a Step to an arbitrary point in the traversal.
void	applyStrategies() Apply the registered TraversalStrategies to the traversal.
Traversal.Admin<S,E>	clone() Cloning is used to duplicate the traversal typically in OLAP environments.
TraversalEngine	getEngine() Get the TraversalEngine that will be used to execute this traversal.
Optional<Graph>	getGraph()
TraversalParent	getParent() Get the TraversalParent Step that is the parent of this traversal.
TraversalSideEffects	getSideEffects() Get the TraversalSideEffects associated with the traversal.
List<Step>	getSteps() Get the Step instances associated with this traversal.
TraversalStrategies	getStrategies() Get the TraversalStrategies associated with this traversal.
TraverserGenerator	getTraverserGenerator() Get the TraverserGenerator associated with this traversal.
boolean	hasNext()
boolean	isLocked() When the traversal has had its TraversalStrategies applied to it, it is locked.
E	next()
<S2,E2> Traversal.Admin<S2,E2>	removeStep(int index) Remove a Step from the traversal.
void	reset() Call the Step.reset() method on every step in the traversal.
void	setEngine(TraversalEngine engine) Set the TraversalEngine to be used for executing this traversal.
void	setGraph(Graph graph)
void	setParent(TraversalParent step) Set the TraversalParent Step that is the parent of this traversal.
void	setSideEffects(TraversalSideEffects sideEffects) Set the TraversalSideEffects of this traversal.
void	setStrategies(TraversalStrategies strategies) Set the TraversalStrategies to be used by this traversal at evaluation time.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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

addStarts, addStep, equals, getEndStep, getStartStep, getTraverserRequirements, removeStep

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

asAdmin, fill, forEachRemaining, forEachRemaining, iterate, next, toBulkSet, toList, toSet, toStream, tryNext

Methods inherited from interface java.util.Iterator

remove

Constructor Detail

AbstractLambdaTraversal

public AbstractLambdaTraversal()

Method Detail

getSteps

public List<Step> getSteps()

Description copied from interface: Traversal.Admin

Get the Step instances associated with this traversal. The steps are ordered according to their linked list structure as defined by Step.getPreviousStep() and Step.getNextStep().

Specified by:

getSteps in interface Traversal.Admin<S,E>

Returns:

the ordered steps of the traversal

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<S,E>

addStep

public <S2,E2> Traversal.Admin<S2,E2> addStep(int index,
                                              Step<?,?> step)
                                       throws IllegalStateException

Description copied from interface: Traversal.Admin

Add a Step to an arbitrary point in the traversal.

Specified by:

addStep in interface Traversal.Admin<S,E>

Type Parameters:

S2 - the new start type of the traversal (if the added step was a start step)

E2 - the new end type of the traversal (if the added step was an end step)

Parameters:

index - the location in the traversal to insert the step

step - the step to add

Returns:

the newly modulated traversal

Throws:

IllegalStateException - if the TraversalStrategies have already been applied

removeStep

public <S2,E2> Traversal.Admin<S2,E2> removeStep(int index)
                                          throws IllegalStateException

Description copied from interface: Traversal.Admin

Remove a Step from the traversal.

Specified by:

removeStep in interface Traversal.Admin<S,E>

Type Parameters:

S2 - the new start type of the traversal (if the removed step was a start step)

E2 - the new end type of the traversal (if the removed step was an end step)

Parameters:

index - the location in the traversal of the step to be evicted

Returns:

the newly modulated traversal

Throws:

IllegalStateException - if the TraversalStrategies have already been applied

applyStrategies

public void applyStrategies()
                     throws IllegalStateException

Description copied from interface: Traversal.Admin

Apply the registered TraversalStrategies to the traversal. Once the strategies are applied, the traversal is "locked" and can no longer have steps added to it. The order of operations for strategy applications should be: globally id steps, apply strategies to root traversal, then to nested traversals.

Specified by:

applyStrategies in interface Traversal.Admin<S,E>

Throws:

IllegalStateException - if the TraversalStrategies have already been applied

getEngine

public TraversalEngine getEngine()

Description copied from interface: Traversal.Admin

Get the TraversalEngine that will be used to execute this traversal.

Specified by:

getEngine in interface Traversal.Admin<S,E>

Returns:

get the traversal engine associated with this traversal.

getTraverserGenerator

public TraverserGenerator getTraverserGenerator()

Description copied from interface: Traversal.Admin

Get the TraverserGenerator associated with this traversal. The traversal generator creates Traverser instances that are respective of the traversal's TraverserRequirement.

Specified by:

getTraverserGenerator in interface Traversal.Admin<S,E>

Returns:

the generator of traversers

setSideEffects

public void setSideEffects(TraversalSideEffects sideEffects)

Description copied from interface: Traversal.Admin

Set the TraversalSideEffects of this traversal.

Specified by:

setSideEffects in interface Traversal.Admin<S,E>

Parameters:

sideEffects - the sideEffects to set for this traversal.

getSideEffects

public TraversalSideEffects getSideEffects()

Description copied from interface: Traversal.Admin

Get the TraversalSideEffects associated with the traversal.

Specified by:

getSideEffects in interface Traversal.Admin<S,E>

Returns:

The traversal sideEffects

setStrategies

public void setStrategies(TraversalStrategies strategies)

Description copied from interface: Traversal.Admin

Set the TraversalStrategies to be used by this traversal at evaluation time.

Specified by:

setStrategies in interface Traversal.Admin<S,E>

Parameters:

strategies - the strategies to use on this traversal

getStrategies

public TraversalStrategies getStrategies()

Description copied from interface: Traversal.Admin

Get the TraversalStrategies associated with this traversal.

Specified by:

getStrategies in interface Traversal.Admin<S,E>

Returns:

the strategies associated with this traversal

setParent

public void setParent(TraversalParent step)

Description copied from interface: Traversal.Admin

Set the TraversalParent Step that is the parent of this traversal. Traversals can be nested and this is the means by which the traversal tree is connected.

Specified by:

setParent in interface Traversal.Admin<S,E>

Parameters:

step - the traversal holder parent step

getParent

public TraversalParent getParent()

Description copied from interface: Traversal.Admin

Get the TraversalParent Step that is the parent of this traversal. Traversals can be nested and this is the means by which the traversal tree is walked.

Specified by:

getParent in interface Traversal.Admin<S,E>

Returns:

the traversal holder parent step

clone

public Traversal.Admin<S,E> clone()

Description copied from interface: Traversal.Admin

Cloning is used to duplicate the traversal typically in OLAP environments.

Specified by:

clone in interface Traversal.Admin<S,E>

Overrides:

clone in class Object

Returns:

The cloned traversal

next

public E next()

Specified by:

next in interface Iterator<E>

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<E>

addStart

public void addStart(Traverser<S> start)

Description copied from interface: Traversal.Admin

Add a single Traverser 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<S,E>

Parameters:

start - a traverser to add to the traversal

isLocked

public boolean isLocked()

Description copied from interface: Traversal.Admin

When the traversal has had its TraversalStrategies applied to it, it is locked.

Specified by:

isLocked in interface Traversal.Admin<S,E>

Returns:

whether the traversal is locked

setEngine

public void setEngine(TraversalEngine engine)

Description copied from interface: Traversal.Admin

Set the TraversalEngine to be used for executing this traversal.

Specified by:

setEngine in interface Traversal.Admin<S,E>

Parameters:

engine - the engine to execute the traversal with.

getGraph

public Optional<Graph> getGraph()

Specified by:

getGraph in interface Traversal.Admin<S,E>

setGraph

public void setGraph(Graph graph)

Specified by:

setGraph in interface Traversal.Admin<S,E>