org.apache.tinkerpop.gremlin.process.traversal

## Interface TraversalSource

- All Superinterfaces:
    AutoCloseable, Cloneable
  All Known Implementing Classes:
    GraphTraversalSource

      public interface TraversalSource
      extends Cloneable, AutoCloseable

  A `TraversalSource` is used to create `Traversal` instances. A traversal source can generate any number of `Traversal` instances. A traversal source is primarily composed of a `Graph` and a `TraversalStrategies`. Various `withXXX`-based methods are used to configure the traversal strategies (called "configurations"). Various other methods (dependent on the traversal source type) will then generate a traversal given the graph and configured strategies (called "spawns"). A traversal source is immutable in that fluent chaining of configurations create new traversal sources. This is unlike `Traversal` and `GraphComputer`, where chained methods configure the same instance. Every traversal source implementation must maintain two constructors to enable proper reflection-based construction.

  `TraversalSource(Graph)` and `TraversalSource(Graph,TraversalStrategies)`
  Author:
    Marko A. Rodriguez (http://markorodriguez.com)

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface and Description
    --- | ---
    `static class` | `TraversalSource.Symbols`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `GREMLIN_REMOTE`
    `static String` | `GREMLIN_REMOTE_CONNECTION_CLASS`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Default Methods
    Modifier and Type | Method and Description
    --- | ---
    `TraversalSource` | `clone()` The clone-method should be used to create immutable traversal sources with each call to a configuration "withXXX"-method.
    `default void` | `close()`
    `default Optional<Class>` | `getAnonymousTraversalClass()`
    `Bytecode` | `getBytecode()` Get the `Bytecode` associated with the current state of this traversal source.
    `Graph` | `getGraph()` Get the `Graph` associated with this traversal source.
    `TraversalStrategies` | `getStrategies()` Get the `TraversalStrategies` associated with this traversal source.
    `default TraversalSource` | `withComputer()` Add the standard `GraphComputer` of the graph that will be used to execute the traversal.
    `default TraversalSource` | `withComputer(Class<? extends GraphComputer> graphComputerClass)` Add a `GraphComputer` class used to execute the traversal.
    `default TraversalSource` | `withComputer(Computer computer)` Add a `Computer` that will generate a `GraphComputer` from the `Graph` that will be used to execute the traversal.
    `default TraversalSource` | `withoutStrategies(Class<? extends TraversalStrategy>... traversalStrategyClasses)` Remove an arbitrary collection of `TraversalStrategy` classes from the traversal source.
    `default TraversalSource` | `withRemote(org.apache.commons.configuration.Configuration conf)` Configures the `TraversalSource` as a "remote" to issue the `Traversal` for execution elsewhere.
    `TraversalSource` | `withRemote(org.apache.tinkerpop.gremlin.process.remote.RemoteConnection connection)` Configures the `TraversalSource` as a "remote" to issue the `Traversal` for execution elsewhere.
    `default TraversalSource` | `withRemote(String configFile)` Configures the `TraversalSource` as a "remote" to issue the `Traversal` for execution elsewhere.
    `default <A> TraversalSource` | `withSack(A initialValue)` Add a sack to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSack(A initialValue, BinaryOperator<A> mergeOperator)` Add a sack to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSack(A initialValue, UnaryOperator<A> splitOperator)` Add a sack to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSack(A initialValue, UnaryOperator<A> splitOperator, BinaryOperator<A> mergeOperator)` Add a sack to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSack(Supplier<A> initialValue)` Add a sack to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSack(Supplier<A> initialValue, BinaryOperator<A> mergeOperator)` Add a sack to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSack(Supplier<A> initialValue, UnaryOperator<A> splitOperator)` Add a sack to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSack(Supplier<A> initialValue, UnaryOperator<A> splitOperator, BinaryOperator<A> mergeOperator)` Add a sack to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSideEffect(String key, A initialValue)` Add a sideEffect to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSideEffect(String key, A initialValue, BinaryOperator<A> reducer)` Add a sideEffect to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSideEffect(String key, Supplier<A> initialValue)` Add a sideEffect to be used throughout the life of a spawned `Traversal`.
    `default <A> TraversalSource` | `withSideEffect(String key, Supplier<A> initialValue, BinaryOperator<A> reducer)` Add a sideEffect to be used throughout the life of a spawned `Traversal`.
    `default TraversalSource` | `withStrategies(TraversalStrategy... traversalStrategies)` Add an arbitrary collection of `TraversalStrategy` instances to the traversal source.

- - ### Field Detail

    - #### GREMLIN_REMOTE

          static final String GREMLIN_REMOTE

      See Also:
        Constant Field Values

    - #### GREMLIN_REMOTE_CONNECTION_CLASS

          static final String GREMLIN_REMOTE_CONNECTION_CLASS

      See Also:
        Constant Field Values

  - ### Method Detail

    - #### getStrategies

          TraversalStrategies getStrategies()

      Get the `TraversalStrategies` associated with this traversal source.
      Returns:
        the traversal strategies of the traversal source

    - #### getGraph

          Graph getGraph()

      Get the `Graph` associated with this traversal source.
      Returns:
        the graph of the traversal source

    - #### getBytecode

          Bytecode getBytecode()

      Get the `Bytecode` associated with the current state of this traversal source.
      Returns:
        the traversal source byte code

    - #### withStrategies

          default TraversalSource withStrategies(TraversalStrategy... traversalStrategies)

      Add an arbitrary collection of `TraversalStrategy` instances to the traversal source.
      Parameters:
        `traversalStrategies` - a collection of traversal strategies to add
      Returns:
        a new traversal source with updated strategies

    - #### withoutStrategies

          default TraversalSource withoutStrategies(Class<? extends TraversalStrategy>... traversalStrategyClasses)

      Remove an arbitrary collection of `TraversalStrategy` classes from the traversal source.
      Parameters:
        `traversalStrategyClasses` - a collection of traversal strategy classes to remove
      Returns:
        a new traversal source with updated strategies

    - #### withComputer

          default TraversalSource withComputer(Computer computer)

      Add a `Computer` that will generate a `GraphComputer` from the `Graph` that will be used to execute the traversal. This adds a `VertexProgramStrategy` to the strategies.
      Parameters:
        `computer` - a builder to generate a graph computer from the graph
      Returns:
        a new traversal source with updated strategies

    - #### withComputer

          default TraversalSource withComputer(Class<? extends GraphComputer> graphComputerClass)

      Add a `GraphComputer` class used to execute the traversal. This adds a `VertexProgramStrategy` to the strategies.
      Parameters:
        `graphComputerClass` - the graph computer class
      Returns:
        a new traversal source with updated strategies

    - #### withComputer

          default TraversalSource withComputer()

      Add the standard `GraphComputer` of the graph that will be used to execute the traversal. This adds a `VertexProgramStrategy` to the strategies.
      Returns:
        a new traversal source with updated strategies

    - #### withSideEffect

          default <A> TraversalSource withSideEffect(String key,
                                                     Supplier<A> initialValue,
                                                     BinaryOperator<A> reducer)

      Add a sideEffect to be used throughout the life of a spawned `Traversal`. This adds a `SideEffectStrategy` to the strategies.
      Parameters:
        `key` - the key of the sideEffect
        `initialValue` - a supplier that produces the initial value of the sideEffect
        `reducer` - a reducer to merge sideEffect mutations into a single result
      Returns:
        a new traversal source with updated strategies

    - #### withSideEffect

          default <A> TraversalSource withSideEffect(String key,
                                                     A initialValue,
                                                     BinaryOperator<A> reducer)

      Add a sideEffect to be used throughout the life of a spawned `Traversal`. This adds a `SideEffectStrategy` to the strategies.
      Parameters:
        `key` - the key of the sideEffect
        `initialValue` - the initial value of the sideEffect
        `reducer` - a reducer to merge sideEffect mutations into a single result
      Returns:
        a new traversal source with updated strategies

    - #### withSideEffect

          default <A> TraversalSource withSideEffect(String key,
                                                     Supplier<A> initialValue)

      Add a sideEffect to be used throughout the life of a spawned `Traversal`. This adds a `SideEffectStrategy` to the strategies.
      Parameters:
        `key` - the key of the sideEffect
        `initialValue` - a supplier that produces the initial value of the sideEffect
      Returns:
        a new traversal source with updated strategies

    - #### withSideEffect

          default <A> TraversalSource withSideEffect(String key,
                                                     A initialValue)

      Add a sideEffect to be used throughout the life of a spawned `Traversal`. This adds a `SideEffectStrategy` to the strategies.
      Parameters:
        `key` - the key of the sideEffect
        `initialValue` - the initial value of the sideEffect
      Returns:
        a new traversal source with updated strategies

    - #### withSack

          default <A> TraversalSource withSack(Supplier<A> initialValue,
                                               UnaryOperator<A> splitOperator,
                                               BinaryOperator<A> mergeOperator)

      Add a sack to be used throughout the life of a spawned `Traversal`. This adds a `SackStrategy` to the strategies.
      Parameters:
        `initialValue` - a supplier that produces the initial value of the sideEffect
        `splitOperator` - the sack split operator
        `mergeOperator` - the sack merge operator
      Returns:
        a new traversal source with updated strategies

    - #### withSack

          default <A> TraversalSource withSack(A initialValue,
                                               UnaryOperator<A> splitOperator,
                                               BinaryOperator<A> mergeOperator)

      Add a sack to be used throughout the life of a spawned `Traversal`. This adds a `SackStrategy` to the strategies.
      Parameters:
        `initialValue` - the initial value of the sideEffect
        `splitOperator` - the sack split operator
        `mergeOperator` - the sack merge operator
      Returns:
        a new traversal source with updated strategies

    - #### withSack

          default <A> TraversalSource withSack(A initialValue)

      Add a sack to be used throughout the life of a spawned `Traversal`. This adds a `SackStrategy` to the strategies.
      Parameters:
        `initialValue` - the initial value of the sideEffect
      Returns:
        a new traversal source with updated strategies

    - #### withSack

          default <A> TraversalSource withSack(Supplier<A> initialValue)

      Add a sack to be used throughout the life of a spawned `Traversal`. This adds a `SackStrategy` to the strategies.
      Parameters:
        `initialValue` - a supplier that produces the initial value of the sideEffect
      Returns:
        a new traversal source with updated strategies

    - #### withSack

          default <A> TraversalSource withSack(Supplier<A> initialValue,
                                               UnaryOperator<A> splitOperator)

      Add a sack to be used throughout the life of a spawned `Traversal`. This adds a `SackStrategy` to the strategies.
      Parameters:
        `initialValue` - a supplier that produces the initial value of the sideEffect
        `splitOperator` - the sack split operator
      Returns:
        a new traversal source with updated strategies

    - #### withSack

          default <A> TraversalSource withSack(A initialValue,
                                               UnaryOperator<A> splitOperator)

      Add a sack to be used throughout the life of a spawned `Traversal`. This adds a `SackStrategy` to the strategies.
      Parameters:
        `initialValue` - the initial value of the sideEffect
        `splitOperator` - the sack split operator
      Returns:
        a new traversal source with updated strategies

    - #### withSack

          default <A> TraversalSource withSack(Supplier<A> initialValue,
                                               BinaryOperator<A> mergeOperator)

      Add a sack to be used throughout the life of a spawned `Traversal`. This adds a `SackStrategy` to the strategies.
      Parameters:
        `initialValue` - a supplier that produces the initial value of the sideEffect
        `mergeOperator` - the sack merge operator
      Returns:
        a new traversal source with updated strategies

    - #### withSack

          default <A> TraversalSource withSack(A initialValue,
                                               BinaryOperator<A> mergeOperator)

      Add a sack to be used throughout the life of a spawned `Traversal`. This adds a `SackStrategy` to the strategies.
      Parameters:
        `initialValue` - the initial value of the sideEffect
        `mergeOperator` - the sack merge operator
      Returns:
        a new traversal source with updated strategies

    - #### withRemote

          default TraversalSource withRemote(org.apache.commons.configuration.Configuration conf)

      Configures the `TraversalSource` as a "remote" to issue the `Traversal` for execution elsewhere. Expects key for `GREMLIN_REMOTE_CONNECTION_CLASS` as well as any configuration required by the underlying `RemoteConnection` which will be instantiated. Note that the `Configuration` object is passed down without change to the creation of the `RemoteConnection` instance.

    - #### withRemote

          default TraversalSource withRemote(String configFile)
                                      throws Exception

      Configures the `TraversalSource` as a "remote" to issue the `Traversal` for execution elsewhere. Calls `withRemote(Configuration)` after reading the properties file specified.
      Throws:
        `Exception`

    - #### withRemote

          TraversalSource withRemote(org.apache.tinkerpop.gremlin.process.remote.RemoteConnection connection)

      Configures the `TraversalSource` as a "remote" to issue the `Traversal` for execution elsewhere. Implementations should track `RemoteConnection` instances that are created and call `AutoCloseable.close()` on them when the `TraversalSource` itself is closed.
      Parameters:
        `connection` - the `RemoteConnection` instance to use to submit the `Traversal`.

    - #### getAnonymousTraversalClass

          default Optional<Class> getAnonymousTraversalClass()

    - #### clone

          TraversalSource clone()

      The clone-method should be used to create immutable traversal sources with each call to a configuration "withXXX"-method. The clone-method should clone the `Bytecode`, `TraversalStrategies`, mutate the cloned strategies accordingly, and then return the cloned traversal source leaving the original unaltered.
      Returns:
        the cloned traversal source

    - #### close

          default void close()
                      throws Exception

      Specified by:
        `close` in interface `AutoCloseable`
      Throws:
        `Exception`

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