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

Class EarlyLimitStrategy

java.lang.Object

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

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

All Implemented Interfaces:

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

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

This strategy looks for RangeGlobalSteps that can be moved further left in the traversal and thus be applied earlier. It will also try to merge multiple RangeGlobalSteps into one. If the logical consequence of one or multiple RangeGlobalSteps is an empty result, the strategy will remove as many steps as possible and add a DiscardStep instead.

Author:

Daniel Kuppitz (http://gremlin.guru)

See Also:

Serialized Form

Example:

 __.out().valueMap().limit(5)                          // becomes __.out().limit(5).valueMap()
 __.outE().range(2, 10).valueMap().limit(5)            // becomes __.outE().range(2, 7).valueMap()
 __.outE().limit(5).valueMap().range(2, -1)            // becomes __.outE().range(2, 5).valueMap()
 __.outE().limit(5).valueMap().range(5, 10)            // becomes __.outE().discard()
 __.outE().limit(5).valueMap().range(5, 10).cap("a")   // becomes __.outE().discard().cap("a")
 

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.
static EarlyLimitStrategy	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.OptimizationStrategy

applyPost, 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>

instance

public static EarlyLimitStrategy instance()