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

Interface Path

All Superinterfaces:
Cloneable, Iterable<Object>
public interface Path extends Cloneable, Iterable<Object>
A Path denotes a particular walk through a Graph as defined by a Traversal. In abstraction, any Path implementation maintains two lists: a list of sets of labels and a list of objects. The list of labels are the labels of the steps traversed. The list of objects are the objects traversed.
Author:
Marko A. Rodriguez (http://markorodriguez.com)

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static class 
    Path.Exceptions
     

  • Method Summary

    Modifier and Type
    Method
    Description
    Path
    clone()
     
    Path
    extend(Object object, Set<String> labels)
    Add a new step to the path with an object and any number of associated labels.
    Path
    extend(Set<String> labels)
    Add labels to the head of the path.
    default void
    forEach(BiConsumer<Object,Set<String>> consumer)
     
    default <A> A
    get(int index)
    Get the object associated with the specified index into the path.
    default <A> A
    get(String label)
    Get the object associated with the particular label of the path.
    default <A> A
    get(Pop pop, String label)
    Pop the object(s) associated with the label of the path.
    default boolean
    hasLabel(String label)
    Return true if the path has the specified label, else return false.
    default <A> A
    head()
    Get the head of the path.
    default boolean
    isEmpty()
    Determine if the path is empty or not.
    default boolean
    isSimple()
    Determines whether the path is a simple or not.
    default Iterator<Object>
    iterator()
     
    List<Set<String>>
    labels()
    An ordered list of the labels associated with the path The set of labels for a particular step are ordered by the order in which extend(Object, Set) was called.
    List<Object>
    objects()
    An ordered list of the objects in the path.
    default boolean
    popEquals(Pop pop, Object other)
     
    Path
    retract(Set<String> labels)
    Remove labels from path.
    default int
    size()
    Get the number of step in the path.
    default Stream<org.javatuples.Pair<Object,Set<String>>>
    stream()
     
    default Path
    subPath(String fromLabel, String toLabel)
    Isolate a sub-path from the path object.

    Methods inherited from interface java.lang.Iterable

    forEach, spliterator

  • Method Details

    • size

      default int size()
      Get the number of step in the path.
      Returns:
      the size of the path

    • isEmpty

      default boolean isEmpty()
      Determine if the path is empty or not.
      Returns:
      whether the path is empty or not.

    • head

      default <A> A head()
      Get the head of the path.
      Type Parameters:
      A - the type of the head of the path
      Returns:
      the head of the path

    • extend

      Path extend(Object object, Set<String> labels)
      Add a new step to the path with an object and any number of associated labels.
      Parameters:
      object - the new head of the path
      labels - the labels at the head of the path
      Returns:
      the extended path

    • extend

      Path extend(Set<String> labels)
      Add labels to the head of the path.
      Parameters:
      labels - the labels at the head of the path
      Returns:
      the path with added labels

    • retract

      Path retract(Set<String> labels)
      Remove labels from path.
      Parameters:
      labels - the labels to remove
      Returns:
      the path with removed labels

    • get

      default <A> A get(String label) throws IllegalArgumentException
      Get the object associated with the particular label of the path. If the path as multiple labels of the type, then return a List of those objects.
      Type Parameters:
      A - the type of the object associated with the label
      Parameters:
      label - the label of the path
      Returns:
      the object associated with the label of the path
      Throws:
      IllegalArgumentException - if the path does not contain the label

    • get

      default <A> A get(Pop pop, String label) throws IllegalArgumentException
      Pop the object(s) associated with the label of the path.
      Type Parameters:
      A - the type of the object associated with the label
      Parameters:
      pop - first for least recent, last for most recent, and all for all in a list
      label - the label of the path
      Returns:
      the object associated with the label of the path
      Throws:
      IllegalArgumentException - if the path does not contain the label

    • get

      default <A> A get(int index)
      Get the object associated with the specified index into the path.
      Type Parameters:
      A - the type of the object associated with the index
      Parameters:
      index - the index of the path
      Returns:
      the object associated with the index of the path

    • hasLabel

      default boolean hasLabel(String label)
      Return true if the path has the specified label, else return false.
      Parameters:
      label - the label to search for
      Returns:
      true if the label exists in the path

    • objects

      List<Object> objects()
      An ordered list of the objects in the path.
      Returns:
      the objects of the path

    • labels

      List<Set<String>> labels()
      An ordered list of the labels associated with the path The set of labels for a particular step are ordered by the order in which extend(Object, Set) was called.
      Returns:
      the labels of the path

    • clone

      Path clone()

    • isSimple

      default boolean isSimple()
      Determines whether the path is a simple or not. A simple path has no cycles and thus, no repeated objects.
      Returns:
      Whether the path is simple or not

    • iterator

      default Iterator<Object> iterator()
      Specified by:
      iterator in interface Iterable<Object>

    • forEach

      default void forEach(BiConsumer<Object,Set<String>> consumer)

    • stream

      default Stream<org.javatuples.Pair<Object,Set<String>>> stream()

    • popEquals

      default boolean popEquals(Pop pop, Object other)

    • subPath

      default Path subPath(String fromLabel, String toLabel)
      Isolate a sub-path from the path object. The isolation is based solely on the path labels. The to-label is inclusive. Thus, from "b" to "c" would isolate the example path as follows a,[b,c],d. Note that if there are multiple path segments with the same label, then its the last occurrence that is isolated. For instance, from "b" to "c" would be a,b,[b,c,d,c].
      Parameters:
      fromLabel - The label to start recording the sub-path from.
      toLabel - The label to end recording the sub-path to.
      Returns:
      the isolated sub-path.