org.apache.tinkerpop.gremlin.structure

## Interface Element

- All Known Subinterfaces:
    Edge, Vertex, VertexProperty<V>

      public interface Element

  An `Element` is the base class for both `Vertex` and `Edge`. An `Element` has an identifier that must be unique to its inheriting classes (`Vertex` or `Edge`). An `Element` can maintain a collection of `Property` objects. Typically, objects are Java primitives (e.g. String, long, int, boolean, etc.)
  Author:
    Marko A. Rodriguez (http://markorodriguez.com), Stephen Mallette (http://stephen.genoprime.com)

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface and Description
    --- | ---
    `static class` | `Element.Exceptions` Common exceptions to use with an element.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Default Methods
    Modifier and Type | Method and Description
    --- | ---
    `Graph` | `graph()` Get the graph that this element is within.
    `Object` | `id()` Gets the unique identifier for the graph `Element`.
    `default Set<String>` | `keys()` Get the keys of the properties associated with this element.
    `String` | `label()` Gets the label for the graph `Element` which helps categorize it.
    `<V> Iterator<? extends Property<V>>` | `properties(String... propertyKeys)` Get an `Iterator` of properties where the `propertyKeys` is meant to be a filter on the available keys.
    `default <V> Property<V>` | `property(String key)` Get a `Property` for the `Element` given its key.
    `<V> Property<V>` | `property(String key, V value)` Add or set a property value for the `Element` given its key.
    `void` | `remove()` Removes the `Element` from the graph.
    `default <V> V` | `value(String key)` Get the value of a `Property` given it's key.
    `default <V> Iterator<V>` | `values(String... propertyKeys)` Get the values of properties as an `Iterator`.

- - ### Method Detail

    - #### id

          Object id()

      Gets the unique identifier for the graph `Element`.
      Returns:
        The id of the element

    - #### label

          String label()

      Gets the label for the graph `Element` which helps categorize it.
      Returns:
        The label of the element

    - #### graph

          Graph graph()

      Get the graph that this element is within.
      Returns:
        the graph of this element

    - #### keys

          default Set<String> keys()

      Get the keys of the properties associated with this element. The default implementation iterators the properties and stores the keys into a `HashSet`.
      Returns:
        The property key set

    - #### property

          default <V> Property<V> property(String key)

      Get a `Property` for the `Element` given its key. The default implementation calls the raw `properties(java.lang.String...)`.

    - #### property

          <V> Property<V> property(String key,
                                   V value)

      Add or set a property value for the `Element` given its key.

    - #### value

          default <V> V value(String key)
                       throws NoSuchElementException

      Get the value of a `Property` given it's key. The default implementation calls `property(java.lang.String)` and then returns the associated value.
      Throws:
        `NoSuchElementException` - if the property does not exist on the `Element`.

    - #### remove

          void remove()

      Removes the `Element` from the graph.

    - #### values

          default <V> Iterator<V> values(String... propertyKeys)

      Get the values of properties as an `Iterator`.

    - #### properties

          <V> Iterator<? extends Property<V>> properties(String... propertyKeys)

      Get an `Iterator` of properties where the `propertyKeys` is meant to be a filter on the available keys. If no keys are provide then return all the properties.

Copyright © 2013–2021 Apache Software Foundation. All rights reserved.