org.apache.tinkerpop.gremlin.process.traversal.step.filter

## Class PathFilterStep<S>

- java.lang.Object
- - org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep<S,S>
  - - org.apache.tinkerpop.gremlin.process.traversal.step.filter.FilterStep<S>
    - - org.apache.tinkerpop.gremlin.process.traversal.step.filter.PathFilterStep<S>

- All Implemented Interfaces:
    Serializable, AutoCloseable, Cloneable, Iterator<Traverser.Admin<S>>, Step<S,S>, ByModulating, FromToModulating, PathProcessor, TraversalParent

      public final class PathFilterStep<S>
      extends FilterStep<S>
      implements FromToModulating, ByModulating, TraversalParent, PathProcessor

  Author:
    Marko A. Rodriguez (http://markorodriguez.com)
  See Also:
    Serialized Form

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.PathProcessor

      `PathProcessor.ElementRequirement`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected String` | `fromLabel`
    `protected String` | `toLabel`

    - ### Fields inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep

      `id, labels, nextEnd, nextStep, previousStep, starts, traversal, traverserStepIdAndLabelsSetByChild`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PathFilterStep(Traversal.Admin traversal, boolean isSimple)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addFrom(String fromLabel)`
    `void` | `addTo(String toLabel)`
    `PathFilterStep<S>` | `clone()` Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication.
    `protected boolean` | `filter(Traverser.Admin<S> traverser)`
    `Set<String>` | `getKeepLabels()`
    `List<Traversal.Admin<Object,Object>>` | `getLocalChildren()`
    `Set<TraverserRequirement>` | `getRequirements()` Provide the necessary `TraverserRequirement` that must be met by the traverser in order for the step to function properly.
    `int` | `hashCode()`
    `void` | `modulateBy(Traversal.Admin<?,?> pathTraversal)`
    `protected Traverser.Admin<S>` | `processNextStart()`
    `void` | `reset()` Reset the state of the step such that it has no incoming starts.
    `void` | `setKeepLabels(Set<String> keepLabels)`
    `void` | `setTraversal(Traversal.Admin<?,?> parentTraversal)` Set the `Traversal` that this step is contained within.
    `String` | `toString()`

    - ### Methods inherited from class org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep

      `addLabel, addStart, addStarts, equals, getId, getLabels, getNextStep, getPreviousStep, getTraversal, hasNext, next, removeLabel, setId, setNextStep, setPreviousStep`

    - ### Methods inherited from class java.lang.Object

      `finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.FromToModulating

      `addFrom, addTo`

    - ### Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.ByModulating

      `modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy, modulateBy`

    - ### Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.TraversalParent

      `addGlobalChild, addLocalChild, asStep, close, getGlobalChildren, getSelfAndChildRequirements, integrateChild, removeGlobalChild, removeLocalChild`

    - ### Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.step.PathProcessor

      `getMaxRequirement, processTraverserPathLabels`

    - ### Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.Step

      `equals`

    - ### Methods inherited from interface java.util.Iterator

      `forEachRemaining, remove`

- - ### Field Detail

    - #### fromLabel

          protected String fromLabel

    - #### toLabel

          protected String toLabel

  - ### Constructor Detail

    - #### PathFilterStep

          public PathFilterStep(Traversal.Admin traversal,
                                boolean isSimple)

  - ### Method Detail

    - #### filter

          protected boolean filter(Traverser.Admin<S> traverser)

      Specified by:
        `filter` in class `FilterStep<S>`

    - #### getRequirements

          public Set<TraverserRequirement> getRequirements()

      Description copied from interface: `Step`
      Provide the necessary `TraverserRequirement` that must be met by the traverser in order for the step to function properly. The provided default implements returns an empty set.
      Specified by:
        `getRequirements` in interface `Step<S,S>`
      Returns:
        the set of requirements

    - #### addFrom

          public void addFrom(String fromLabel)

      Specified by:
        `addFrom` in interface `FromToModulating`

    - #### addTo

          public void addTo(String toLabel)

      Specified by:
        `addTo` in interface `FromToModulating`

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `AbstractStep<S,S>`

    - #### clone

          public PathFilterStep<S> clone()

      Description copied from interface: `Step`
      Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication. When cloning a step, it is important that the steps, the cloned step is equivalent to the state of the step when reset() is called. Moreover, the previous and next steps should be set to `EmptyStep`.
      Specified by:
        `clone` in interface `Step<S,S>`
      Overrides:
        `clone` in class `AbstractStep<S,S>`
      Returns:
        The cloned step

    - #### setTraversal

          public void setTraversal(Traversal.Admin<?,?> parentTraversal)

      Description copied from interface: `Step`
      Set the `Traversal` that this step is contained within.
      Specified by:
        `setTraversal` in interface `Step<S,S>`
      Overrides:
        `setTraversal` in class `AbstractStep<S,S>`
      Parameters:
        `parentTraversal` - the new traversal for this step

    - #### getLocalChildren

          public List<Traversal.Admin<Object,Object>> getLocalChildren()

      Specified by:
        `getLocalChildren` in interface `TraversalParent`

    - #### modulateBy

          public void modulateBy(Traversal.Admin<?,?> pathTraversal)

      Specified by:
        `modulateBy` in interface `ByModulating`

    - #### reset

          public void reset()

      Description copied from interface: `Step`
      Reset the state of the step such that it has no incoming starts. Internal states are to be reset, but any sideEffect data structures are not to be recreated.
      Specified by:
        `reset` in interface `Step<S,S>`
      Overrides:
        `reset` in class `AbstractStep<S,S>`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `AbstractStep<S,S>`

    - #### setKeepLabels

          public void setKeepLabels(Set<String> keepLabels)

      Specified by:
        `setKeepLabels` in interface `PathProcessor`

    - #### processNextStart

          protected Traverser.Admin<S> processNextStart()

      Overrides:
        `processNextStart` in class `FilterStep<S>`

    - #### getKeepLabels

          public Set<String> getKeepLabels()

      Specified by:
        `getKeepLabels` in interface `PathProcessor`

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