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

    All Methods Static Methods Instance Methods Concrete Methods
    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()

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