Package org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization

Class PathProcessorStrategy

java.lang.Object

org.apache.tinkerpop.gremlin.process.traversal.strategy.AbstractTraversalStrategy<TraversalStrategy.OptimizationStrategy>

org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathProcessorStrategy

All Implemented Interfaces:

Serializable, Comparable<Class<? extends TraversalStrategy>>, TraversalStrategy<TraversalStrategy.OptimizationStrategy>, TraversalStrategy.OptimizationStrategy

public final class PathProcessorStrategy
extends AbstractTraversalStrategy<TraversalStrategy.OptimizationStrategy>
implements TraversalStrategy.OptimizationStrategy

PathProcessStrategy is an OLAP strategy that does its best to turn non-local children in where() and select() into local children by inlining components of the non-local child. In this way, PathProcessStrategy helps to ensure that more traversals meet the local child constraint imposed on OLAP traversals.

Author:

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

See Also:

Serialized Form

Example:

 __.select(a).by(x)               // is replaced by select(a).map(x)
 __.select(a,b).by(x).by(y)       // is replaced by select(a).by(x).as(a).select(b).by(y).as(b).select(a,b)
 __.where(as(a).out().as(b))      // is replaced by as(xyz).select(a).where(out().as(b)).select(xyz)
 __.where(as(a).out())            // is replaced by as(xyz).select(a).filter(out()).select(xyz)
 

Nested Class Summary

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

TraversalStrategy.DecorationStrategy, TraversalStrategy.FinalizationStrategy, TraversalStrategy.OptimizationStrategy, TraversalStrategy.ProviderOptimizationStrategy, TraversalStrategy.VerificationStrategy

Method Summary

Modifier and Type	Method	Description
void	apply(Traversal.Admin<?,?> traversal)	The transformation the strategy applies to the traversal.
Set<Class<? extends TraversalStrategy.OptimizationStrategy>>	applyPost()	The GValueReductionStrategy should be the last TinkerPop optimnization strategy applied.
Set<Class<? extends TraversalStrategy.OptimizationStrategy>>	applyPrior()	The set of strategies that must be executed before this strategy is executed.
static PathProcessorStrategy	instance()

Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.strategy.AbstractTraversalStrategy

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

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

getConfiguration

Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategy.OptimizationStrategy

compareTo, getTraversalCategory

Method Detail

apply

public void apply(Traversal.Admin<?,?> traversal)

Description copied from interface: TraversalStrategy

The transformation the strategy applies to the traversal.

Specified by:

apply in interface TraversalStrategy<TraversalStrategy.OptimizationStrategy>

applyPrior

public Set<Class<? extends TraversalStrategy.OptimizationStrategy>> applyPrior()

Description copied from interface: TraversalStrategy

The set of strategies that must be executed before this strategy is executed. If there are no ordering requirements, the default implementation returns an empty set.

Specified by:

applyPrior in interface TraversalStrategy<TraversalStrategy.OptimizationStrategy>

Returns:

the set of strategies that must be executed prior to this one.

applyPost

public Set<Class<? extends TraversalStrategy.OptimizationStrategy>> applyPost()

Description copied from interface: TraversalStrategy.OptimizationStrategy

The GValueReductionStrategy should be the last TinkerPop optimnization strategy applied. Adding it here ensures will help to enforce that more globally. Implementations overriding this method should have a good reason to ignore this.

Specified by:

applyPost in interface TraversalStrategy<TraversalStrategy.OptimizationStrategy>

Specified by:

applyPost in interface TraversalStrategy.OptimizationStrategy

Returns:

the set of strategies that must be executed post this one

instance

public static PathProcessorStrategy instance()