org.apache.tinkerpop.gremlin.process.traversal.dsl.graph

Class GraphTraversalSource

java.lang.Object

org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource

All Implemented Interfaces:

AutoCloseable, Cloneable, TraversalSource

Direct Known Subclasses:

CredentialTraversalSourceDsl

public class GraphTraversalSource
extends Object
implements TraversalSource

A GraphTraversalSource is the primary DSL of the Gremlin traversal machine. It provides access to all the configurations and steps for Turing complete graph computing. Any DSL can be constructed based on the methods of both GraphTraversalSource and GraphTraversal.

Author:

Marko A. Rodriguez (http://markorodriguez.com), Stephen Mallette (http://stephen.genoprime.com)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	GraphTraversalSource.Symbols

Field Summary

Fields

Modifier and Type	Field and Description
protected Bytecode	bytecode
protected RemoteConnection	connection
protected Graph	graph
protected TraversalStrategies	strategies

Constructor Summary

Constructors

Constructor and Description
GraphTraversalSource(Graph graph)
GraphTraversalSource(Graph graph, TraversalStrategies traversalStrategies)
GraphTraversalSource(RemoteConnection connection)

Method Summary

Modifier and Type	Method and Description
GraphTraversal<Edge,Edge>	addE(String label) Spawns a GraphTraversal by adding an edge with the specified label.
GraphTraversal<Edge,Edge>	addE(Traversal<?,String> edgeLabelTraversal) Spawns a GraphTraversal by adding a edge with a label as specified by the provided Traversal.
GraphTraversal<Vertex,Vertex>	addV() Spawns a GraphTraversal by adding a vertex with the default label.
GraphTraversal<Vertex,Vertex>	addV(String vertexLabel) Spawns a GraphTraversal by adding a vertex with the specified label.
GraphTraversal<Vertex,Vertex>	addV(Traversal<?,String> vertexLabelTraversal) Spawns a GraphTraversal by adding a vertex with the label as determined by a Traversal.
<S> GraphTraversal<S,S>	call() Spawns a GraphTraversal starting with a list of available services.
<S> GraphTraversal<S,S>	call(String service) Spawns a GraphTraversal starting with values produced by the specified service call with no parameters.
<S> GraphTraversal<S,S>	call(String service, Map params) Spawns a GraphTraversal starting with values produced by the specified service call with the specified static parameters.
<S> GraphTraversal<S,S>	call(String service, Map params, Traversal<S,Map> childTraversal) Spawns a GraphTraversal starting with values produced by the specified service call with both static and dynamic parameters produced by the specified child traversal.
<S> GraphTraversal<S,S>	call(String service, Traversal<S,Map> childTraversal) Spawns a GraphTraversal starting with values produced by the specified service call with dynamic parameters produced by the specified child traversal.
GraphTraversalSource	clone() The clone-method should be used to create immutable traversal sources with each call to a configuration "withXXX"-method.
void	close() If there is an underlying RemoteConnection it will be closed by this method.
GraphTraversal<Edge,Edge>	E(Object... edgeIds) Spawns a GraphTraversal starting with all edges or some subset of edges as specified by their unique identifier.
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.
<S> GraphTraversal<S,S>	inject(S... starts) Spawns a GraphTraversal starting it with arbitrary values.
<S> GraphTraversal<S,S>	io(String file) Performs a read or write based operation on the Graph backing this GraphTraversalSource.
GraphTraversal<Edge,Edge>	mergeE(Map<?,Object> searchCreate) Spawns a GraphTraversal by doing a merge (i.e.
GraphTraversal<Edge,Edge>	mergeE(Traversal<?,Map<Object,Object>> searchCreate) Spawns a GraphTraversal by doing a merge (i.e.
GraphTraversal<Vertex,Vertex>	mergeV(Map<Object,Object> searchCreate) Spawns a GraphTraversal by doing a merge (i.e.
<S> GraphTraversal<S,Vertex>	mergeV(Traversal<?,Map<Object,Object>> searchCreate) Spawns a GraphTraversal by doing a merge (i.e.
String	toString()
Transaction	tx() Proxies calls through to the underlying Graph.tx() or to the RemoteConnection.tx().
GraphTraversal<Vertex,Vertex>	V(Object... vertexIds) Spawns a GraphTraversal starting with all vertices or some subset of vertices as specified by their unique identifier.
GraphTraversalSource	with(String key) Provides a configuration to a traversal in the form of a key which is the same as with(key, true).
GraphTraversalSource	with(String key, Object value) Provides a configuration to a traversal in the form of a key value pair.
GraphTraversalSource	withBulk(boolean useBulk)
GraphTraversalSource	withComputer() Add the standard GraphComputer of the graph that will be used to execute the traversal.
GraphTraversalSource	withComputer(Class<? extends GraphComputer> graphComputerClass) Add a GraphComputer class used to execute the traversal.
GraphTraversalSource	withComputer(Computer computer) Add a Computer that will generate a GraphComputer from the Graph that will be used to execute the traversal.
GraphTraversalSource	withoutStrategies(Class<? extends TraversalStrategy>... traversalStrategyClasses) Remove an arbitrary collection of TraversalStrategy classes from the traversal source.
GraphTraversalSource	withPath()
<A> GraphTraversalSource	withSack(A initialValue) Add a sack to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSack(A initialValue, BinaryOperator<A> mergeOperator) Add a sack to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSack(A initialValue, UnaryOperator<A> splitOperator) Add a sack to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSack(A initialValue, UnaryOperator<A> splitOperator, BinaryOperator<A> mergeOperator) Add a sack to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSack(Supplier<A> initialValue) Add a sack to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSack(Supplier<A> initialValue, BinaryOperator<A> mergeOperator) Add a sack to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSack(Supplier<A> initialValue, UnaryOperator<A> splitOperator) Add a sack to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSack(Supplier<A> initialValue, UnaryOperator<A> splitOperator, BinaryOperator<A> mergeOperator) Add a sack to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSideEffect(String key, A initialValue) Add a sideEffect to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSideEffect(String key, A initialValue, BinaryOperator<A> reducer) Add a sideEffect to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSideEffect(String key, Supplier<A> initialValue) Add a sideEffect to be used throughout the life of a spawned Traversal.
<A> GraphTraversalSource	withSideEffect(String key, Supplier<A> initialValue, BinaryOperator<A> reducer) Add a sideEffect to be used throughout the life of a spawned Traversal.
GraphTraversalSource	withStrategies(TraversalStrategy... traversalStrategies) Add an arbitrary collection of TraversalStrategy instances to the traversal source.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

connection

protected transient RemoteConnection connection

graph

protected final Graph graph

strategies

protected TraversalStrategies strategies

bytecode

protected Bytecode bytecode

Constructor Detail

GraphTraversalSource

public GraphTraversalSource(Graph graph,
                            TraversalStrategies traversalStrategies)

GraphTraversalSource

public GraphTraversalSource(Graph graph)

GraphTraversalSource

public GraphTraversalSource(RemoteConnection connection)

Method Detail

getAnonymousTraversalClass

public Optional<Class<?>> getAnonymousTraversalClass()

Specified by:

getAnonymousTraversalClass in interface TraversalSource

getStrategies

public TraversalStrategies getStrategies()

Description copied from interface: TraversalSource

Get the TraversalStrategies associated with this traversal source.

Specified by:

getStrategies in interface TraversalSource

Returns:

the traversal strategies of the traversal source

getGraph

public Graph getGraph()

Description copied from interface: TraversalSource

Get the Graph associated with this traversal source.

Specified by:

getGraph in interface TraversalSource

Returns:

the graph of the traversal source

getBytecode

public Bytecode getBytecode()

Description copied from interface: TraversalSource

Get the Bytecode associated with the current state of this traversal source.

Specified by:

getBytecode in interface TraversalSource

Returns:

the traversal source byte code

clone

public GraphTraversalSource clone()

Description copied from interface: TraversalSource

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.

Specified by:

clone in interface TraversalSource

Overrides:

clone in class Object

Returns:

the cloned traversal source

with

public GraphTraversalSource with(String key)

Provides a configuration to a traversal in the form of a key which is the same as with(key, true). The key of the configuration must be graph provider specific and therefore a configuration could be supplied that is not known to be valid until execution.

Specified by:

with in interface TraversalSource

Parameters:

key - the key of the configuration to apply to a traversal

Returns:

a new traversal source with the included configuration

with

public GraphTraversalSource with(String key,
                                 Object value)

Provides a configuration to a traversal in the form of a key value pair. The key of the configuration must be graph provider specific and therefore a configuration could be supplied that is not known to be valid until execution. This is a handy shortcut for building an OptionsStrategy manually and then add with TraversalSource.withStrategies(TraversalStrategy[]).

Specified by:

with in interface TraversalSource

Parameters:

key - the key of the configuration to apply to a traversal

value - the value of the configuration to apply to a traversal

Returns:

a new traversal source with the included configuration

withStrategies

public GraphTraversalSource withStrategies(TraversalStrategy... traversalStrategies)

Add an arbitrary collection of TraversalStrategy instances to the traversal source.

Specified by:

withStrategies in interface TraversalSource

Parameters:

traversalStrategies - a collection of traversal strategies to add

Returns:

a new traversal source with updated strategies

withoutStrategies

public GraphTraversalSource withoutStrategies(Class<? extends TraversalStrategy>... traversalStrategyClasses)

Remove an arbitrary collection of TraversalStrategy classes from the traversal source.

Specified by:

withoutStrategies in interface TraversalSource

Parameters:

traversalStrategyClasses - a collection of traversal strategy classes to remove

Returns:

a new traversal source with updated strategies

withComputer

public GraphTraversalSource 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.

Specified by:

withComputer in interface TraversalSource

Parameters:

computer - a builder to generate a graph computer from the graph

Returns:

a new traversal source with updated strategies

withComputer

public GraphTraversalSource withComputer(Class<? extends GraphComputer> graphComputerClass)

Add a GraphComputer class used to execute the traversal. This adds a VertexProgramStrategy to the strategies.

Specified by:

withComputer in interface TraversalSource

Parameters:

graphComputerClass - the graph computer class

Returns:

a new traversal source with updated strategies

withComputer

public GraphTraversalSource withComputer()

Add the standard GraphComputer of the graph that will be used to execute the traversal. This adds a VertexProgramStrategy to the strategies.

Specified by:

withComputer in interface TraversalSource

Returns:

a new traversal source with updated strategies

withSideEffect

public <A> GraphTraversalSource 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.

Specified by:

withSideEffect in interface TraversalSource

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

public <A> GraphTraversalSource 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.

Specified by:

withSideEffect in interface TraversalSource

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

public <A> GraphTraversalSource 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.

Specified by:

withSideEffect in interface TraversalSource

Parameters:

key - the key of the sideEffect

initialValue - the initial value of the sideEffect

Returns:

a new traversal source with updated strategies

withSideEffect

public <A> GraphTraversalSource 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.

Specified by:

withSideEffect in interface TraversalSource

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

withSack

public <A> GraphTraversalSource 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.

Specified by:

withSack in interface TraversalSource

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

public <A> GraphTraversalSource 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.

Specified by:

withSack in interface TraversalSource

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

public <A> GraphTraversalSource withSack(A initialValue)

Add a sack to be used throughout the life of a spawned Traversal. This adds a SackStrategy to the strategies.

Specified by:

withSack in interface TraversalSource

Parameters:

initialValue - the initial value of the sideEffect

Returns:

a new traversal source with updated strategies

withSack

public <A> GraphTraversalSource withSack(Supplier<A> initialValue)

Add a sack to be used throughout the life of a spawned Traversal. This adds a SackStrategy to the strategies.

Specified by:

withSack in interface TraversalSource

Parameters:

initialValue - a supplier that produces the initial value of the sideEffect

Returns:

a new traversal source with updated strategies

withSack

public <A> GraphTraversalSource 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.

Specified by:

withSack in interface TraversalSource

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

public <A> GraphTraversalSource 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.

Specified by:

withSack in interface TraversalSource

Parameters:

initialValue - the initial value of the sideEffect

splitOperator - the sack split operator

Returns:

a new traversal source with updated strategies

withSack

public <A> GraphTraversalSource 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.

Specified by:

withSack in interface TraversalSource

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

public <A> GraphTraversalSource 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.

Specified by:

withSack in interface TraversalSource

Parameters:

initialValue - the initial value of the sideEffect

mergeOperator - the sack merge operator

Returns:

a new traversal source with updated strategies

withBulk

public GraphTraversalSource withBulk(boolean useBulk)

withPath

public GraphTraversalSource withPath()

addV

public GraphTraversal<Vertex,Vertex> addV(String vertexLabel)

Spawns a GraphTraversal by adding a vertex with the specified label. If the label is null then it will default to Vertex.DEFAULT_LABEL.

Since:

3.1.0-incubating

addV

public GraphTraversal<Vertex,Vertex> addV(Traversal<?,String> vertexLabelTraversal)

Spawns a GraphTraversal by adding a vertex with the label as determined by a Traversal. If the vertexLabelTraversal is null then it will default to Vertex.DEFAULT_LABEL.

Since:

3.3.1

addV

public GraphTraversal<Vertex,Vertex> addV()

Spawns a GraphTraversal by adding a vertex with the default label.

Since:

3.1.0-incubating

addE

public GraphTraversal<Edge,Edge> addE(String label)

Spawns a GraphTraversal by adding an edge with the specified label.

Since:

3.1.0-incubating

addE

public GraphTraversal<Edge,Edge> addE(Traversal<?,String> edgeLabelTraversal)

Spawns a GraphTraversal by adding a edge with a label as specified by the provided Traversal.

Since:

3.3.1

mergeV

public GraphTraversal<Vertex,Vertex> mergeV(Map<Object,Object> searchCreate)

Spawns a GraphTraversal by doing a merge (i.e. upsert) style operation for an Vertex using a Map as an argument. The Map represents search criteria and will match each of the supplied key/value pairs where the keys may be String property values or a value of T. If a match is not made it will use that search criteria to create the new Vertex.

Parameters:

searchCreate - This Map can have a key of T or a String.

Since:

3.6.0

mergeV

public <S> GraphTraversal<S,Vertex> mergeV(Traversal<?,Map<Object,Object>> searchCreate)

Spawns a GraphTraversal by doing a merge (i.e. upsert) style operation for an Vertex using a Map as an argument. The Map represents search criteria and will match each of the supplied key/value pairs where the keys may be String property values or a value of T. If a match is not made it will use that search criteria to create the new Vertex.

Parameters:

searchCreate - This anonymous Traversal must produce a Map that may have a keys of T or a String.

Since:

3.6.0

mergeE

public GraphTraversal<Edge,Edge> mergeE(Map<?,Object> searchCreate)

Spawns a GraphTraversal by doing a merge (i.e. upsert) style operation for an Edge using a Map as an argument.

Parameters:

searchCreate - This Map can have a key of T Direction or a String.

Since:

3.6.0

mergeE

public GraphTraversal<Edge,Edge> mergeE(Traversal<?,Map<Object,Object>> searchCreate)

Spawns a GraphTraversal by doing a merge (i.e. upsert) style operation for an Edge using a Map as an argument.

Parameters:

searchCreate - This Map can have a key of T Direction or a String.

Since:

3.6.0

inject

public <S> GraphTraversal<S,S> inject(S... starts)

Spawns a GraphTraversal starting it with arbitrary values.

V

public GraphTraversal<Vertex,Vertex> V(Object... vertexIds)

Spawns a GraphTraversal starting with all vertices or some subset of vertices as specified by their unique identifier.

Since:

3.0.0-incubating

E

public GraphTraversal<Edge,Edge> E(Object... edgeIds)

Spawns a GraphTraversal starting with all edges or some subset of edges as specified by their unique identifier.

Since:

3.0.0-incubating

call

public <S> GraphTraversal<S,S> call()

Spawns a GraphTraversal starting with a list of available services.

Since:

3.6.0

call

public <S> GraphTraversal<S,S> call(String service)

Spawns a GraphTraversal starting with values produced by the specified service call with no parameters.

Parameters:

service - the name of the service call

Since:

3.6.0

call

public <S> GraphTraversal<S,S> call(String service,
                                    Map params)

Spawns a GraphTraversal starting with values produced by the specified service call with the specified static parameters.

Parameters:

service - the name of the service call

params - static parameter map (no nested traversals)

Since:

3.6.0

call

public <S> GraphTraversal<S,S> call(String service,
                                    Traversal<S,Map> childTraversal)

Spawns a GraphTraversal starting with values produced by the specified service call with dynamic parameters produced by the specified child traversal.

Parameters:

service - the name of the service call

childTraversal - a traversal that will produce a Map of parameters for the service call when invoked.

Since:

3.6.0

call

public <S> GraphTraversal<S,S> call(String service,
                                    Map params,
                                    Traversal<S,Map> childTraversal)

Spawns a GraphTraversal starting with values produced by the specified service call with both static and dynamic parameters produced by the specified child traversal. These parameters will be merged at execution time per the provider implementation. Reference implementation merges dynamic into static (dynamic will overwrite static).

Parameters:

service - the name of the service call

params - static parameter map (no nested traversals)

childTraversal - a traversal that will produce a Map of parameters for the service call when invoked.

Since:

3.6.0

io

public <S> GraphTraversal<S,S> io(String file)

Performs a read or write based operation on the Graph backing this GraphTraversalSource. This step can be accompanied by the GraphTraversal.with(String, Object) modulator for further configuration and must be accompanied by a GraphTraversal.read() or GraphTraversal.write() modulator step which will terminate the traversal.

Parameters:

file - the name of file for which the read or write will apply - note that the context of how this parameter is used is wholly dependent on the implementation

Returns:

the traversal with the IoStep added

Since:

3.4.0

See Also:

Reference Documentation - IO Step, Reference Documentation - Read Step, Reference Documentation - Write Step

tx

public Transaction tx()

Proxies calls through to the underlying Graph.tx() or to the RemoteConnection.tx().

close

public void close()
           throws Exception

If there is an underlying RemoteConnection it will be closed by this method.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface TraversalSource

Throws:

Exception

toString

public String toString()

Overrides:

toString in class Object