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

Class FilterRankingStrategy

java.lang.Object

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

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

All Implemented Interfaces:

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

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

FilterRankingStrategy reorders filter- and order-steps according to their rank. Step ranks are defined within the strategy and indicate when it is reasonable for a step to move in front of another. It will also do its best to push step labels as far "right" as possible in order to keep traversers as small and bulkable as possible prior to the absolute need for path-labeling.

Author:

Daniel Kuppitz (http://gremlin.guru), Marko A. Rodriguez (http://markorodriguez.com)

See Also:

Serialized Form

Example:

 __.order().dedup()                        // is replaced by __.dedup().order()
 __.dedup().filter(out()).has("value", 0)  // is replaced by __.has("value", 0).filter(out()).dedup()
 

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 FilterRankingStrategy	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 FilterRankingStrategy instance()