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

Class AdjacentToIncidentStrategy

java.lang.Object

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

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

All Implemented Interfaces:

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

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

This strategy looks for vertex- and value-emitting steps followed by a CountGlobalStep and replaces the pattern with an edge- or property-emitting step followed by a CountGlobalStep. Furthermore, if a vertex- or value-emitting step is the last step in a .has(traversal), .and(traversal, ...) or .or(traversal, ...) child traversal, it is replaced by an appropriate edge- or property-emitting step.

Author:

Daniel Kuppitz (http://gremlin.guru)

See Also:

Serialized Form

Example:

 __.out().count()            // is replaced by __.outE().count()
 __.in().limit(3).count()    // is replaced by __.inE().limit(3).count()
 __.values("name").count()   // is replaced by __.properties("name").count()
 __.where(__.out())          // is replaced by __.where(__.outE())
 __.where(__.values())       // is replaced by __.where(__.properties())
 __.and(__.in(), __.out())   // is replaced by __.and(__.inE(), __.outE())
 

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

Field Summary

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

STRATEGY

Method Summary

Modifier and Type	Method and Description
void	apply(Traversal.Admin<?,?> traversal)
Set<Class<? extends TraversalStrategy.OptimizationStrategy>>	applyPrior() The set of strategies that must be executed before this strategy is executed.
static AdjacentToIncidentStrategy	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.OptimizationStrategy

compareTo, getTraversalCategory

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

applyPost, getConfiguration

Method Detail

apply

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

instance

public static AdjacentToIncidentStrategy instance()