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

Class TinkerGraphCountStrategy

java.lang.Object

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

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

All Implemented Interfaces:

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

public final class TinkerGraphCountStrategy
extends AbstractTraversalStrategy<TraversalStrategy.ProviderOptimizationStrategy>
implements TraversalStrategy.ProviderOptimizationStrategy

This strategy will do a graph size call if the traversal is a count of the vertices and edges of the graph or a one-to-one map chain thereof.

Author:

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

See Also:

• Serialized Form

Example:

 g.V().count()               // is replaced by TinkerCountGlobalStep
 g.V().map(out()).count()    // is replaced by TinkerCountGlobalStep
 g.E().label().count()       // is replaced by TinkerCountGlobalStep
 

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.ProviderOptimizationStrategy>>	applyPost()	The set of strategies that must be executed after this strategy is executed.
static TinkerGraphCountStrategy	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

applyPrior, getConfiguration

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

compareTo, getTraversalCategory

Method Details

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.ProviderOptimizationStrategy>

applyPost

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

Description copied from interface: TraversalStrategy

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

Specified by:

applyPost in interface TraversalStrategy<TraversalStrategy.ProviderOptimizationStrategy>

Returns:

the set of strategies that must be executed post this one

instance

public static TinkerGraphCountStrategy instance()