org.apache.tinkerpop.gremlin.structure

Interface Graph

All Superinterfaces:

AutoCloseable, Host

All Known Implementing Classes:

ComputerGraph, EmptyGraph, HadoopGraph, Neo4jGraph, RemoteGraph, StarGraph, TinkerGraph

public interface Graph
extends AutoCloseable, Host

A Graph is a container object for a collection of Vertex, Edge, VertexProperty, and Property objects.

Author:

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

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	Graph.Exceptions Common exceptions to use with a graph.
static interface	Graph.Features An interface that represents the capabilities of a Graph implementation.
static class	Graph.Hidden This should only be used by providers to create keys, labels, etc.
static interface	Graph.OptIn Defines the test suite that the implementer has decided to support and represents publicly as "passing".
static interface	Graph.OptIns Holds a collection of Graph.OptIn enabling multiple Graph.OptIn to be applied to a single suite.
static interface	Graph.OptOut Defines a test in the suite that the implementer does not want to run.
static interface	Graph.OptOuts Holds a collection of Graph.OptOut enabling multiple Graph.OptOut to be applied to a single suite.
static interface	Graph.Variables Graph variables are a set of key/value pairs associated with the graph.

Field Summary

Fields

Modifier and Type	Field and Description
static String	GRAPH Configuration key used by GraphFactory} to determine which graph to instantiate.

Method Summary

Modifier and Type	Method and Description
Vertex	addVertex(Object... keyValues) Add a Vertex to the graph given an optional series of key/value pairs.
default Vertex	addVertex(String label) Add a Vertex to the graph with provided vertex label.
void	close() Closing a Graph is equivalent to "shutdown" and implies that no further operations can be executed on the instance.
GraphComputer	compute() Generate a GraphComputer using the default engine of the underlying graph system.
<C extends GraphComputer> C	compute(Class<C> graphComputerClass) Declare the GraphComputer to use for OLAP operations on the graph.
Configuration	configuration() Get the Configuration associated with the construction of this graph.
Iterator<Edge>	edges(Object... edgeIds) Get the Edge objects in this graph with the provided edge ids or Edge objects.
default Graph.Features	features() Gets the Graph.Features exposed by the underlying Graph implementation.
default <I extends Io> I	io(Io.Builder<I> builder) Deprecated. As of release 3.4.0, replaced by GraphTraversalSource.io(String).
default GraphTraversalSource	traversal() Generate a reusable GraphTraversalSource instance.
default <C extends TraversalSource> C	traversal(Class<C> traversalSourceClass) Generate a TraversalSource using the specified TraversalSource class.
Transaction	tx() Configure and control the transactions for those graphs that support this feature.
Graph.Variables	variables() A collection of global Graph.Variables associated with the graph.
Iterator<Vertex>	vertices(Object... vertexIds) Get the Vertex objects in this graph with the provided vertex ids or Vertex objects themselves.

Methods inherited from interface org.apache.tinkerpop.gremlin.structure.util.Host

getHostingVertex

Field Detail

GRAPH

static final String GRAPH

Configuration key used by GraphFactory} to determine which graph to instantiate.

See Also:

Constant Field Values

Method Detail

addVertex

Vertex addVertex(Object... keyValues)

Add a Vertex to the graph given an optional series of key/value pairs. These key/values must be provided in an even number where the odd numbered arguments are String property keys and the even numbered arguments are the related property values.

Parameters:

keyValues - The key/value pairs to turn into vertex properties

Returns:

The newly created vertex

addVertex

default Vertex addVertex(String label)

Add a Vertex to the graph with provided vertex label.

Parameters:

label - the label of the vertex

Returns:

The newly created labeled vertex

compute

<C extends GraphComputer> C compute(Class<C> graphComputerClass)
                             throws IllegalArgumentException

Declare the GraphComputer to use for OLAP operations on the graph. If the graph does not support graph computer then an UnsupportedOperationException is thrown.

Parameters:

graphComputerClass - The graph computer class to use.

Returns:

A graph computer for processing this graph

Throws:

IllegalArgumentException - if the provided GraphComputer class is not supported.

compute

GraphComputer compute()
               throws IllegalArgumentException

Generate a GraphComputer using the default engine of the underlying graph system. This is a shorthand method for the more involved method that uses compute(Class).

Returns:

A default graph computer

Throws:

IllegalArgumentException - if there is no default graph computer

traversal

default <C extends TraversalSource> C traversal(Class<C> traversalSourceClass)

Generate a TraversalSource using the specified TraversalSource class. The reusable TraversalSource provides methods for spawning Traversal instances.

Type Parameters:

C - The traversal source class

Parameters:

traversalSourceClass - The traversal source class

traversal

default GraphTraversalSource traversal()

Generate a reusable GraphTraversalSource instance. The GraphTraversalSource provides methods for creating GraphTraversal instances.

Returns:

A graph traversal source

vertices

Iterator<Vertex> vertices(Object... vertexIds)

Get the Vertex objects in this graph with the provided vertex ids or Vertex objects themselves. If no ids are provided, get all vertices. Note that a vertex identifier does not need to correspond to the actual id used in the graph. It needs to be a bit more flexible than that in that given the Graph.Features around id support, multiple arguments might be applicable here.

If the graph return true for Graph.Features.ElementFeatures.supportsNumericIds() then it should support filters as with:

• g.vertices(v)
• g.vertices(v.id())
• g.vertices(1)
• g.vertices(1L)
• g.vertices(1.0d)
• g.vertices(1.0f)
• g.vertices("1")

If the graph return true for Graph.Features.ElementFeatures.supportsCustomIds() ()} then it should support filters as with:

• g.vertices(v)
• g.vertices(v.id())
• g.vertices(v.id().toString())

If the graph return true for Graph.Features.ElementFeatures.supportsAnyIds() ()} then it should support filters as with:

• g.vertices(v)
• g.vertices(v.id())

If the graph return true for Graph.Features.ElementFeatures.supportsStringIds() ()} then it should support filters as with:

• g.vertices(v)
• g.vertices(v.id().toString())
• g.vertices("id")

If the graph return true for Graph.Features.ElementFeatures.supportsStringIds() ()} then it should support filters as with:

• g.vertices(v)
• g.vertices(v.id().toString())
• g.vertices("id")

Parameters:

vertexIds - the ids of the vertices to get

Returns:

an Iterator of vertices that match the provided vertex ids

edges

Iterator<Edge> edges(Object... edgeIds)

Get the Edge objects in this graph with the provided edge ids or Edge objects. If no ids are provided, get all edges. Note that an edge identifier does not need to correspond to the actual id used in the graph. It needs to be a bit more flexible than that in that given the Graph.Features around id support, multiple arguments might be applicable here.

If the graph return true for Graph.Features.ElementFeatures.supportsNumericIds() then it should support filters as with:

• g.edges(e)
• g.edges(e.id())
• g.edges(1)
• g.edges(1L)
• g.edges(1.0d)
• g.edges(1.0f)
• g.edges("1")

If the graph return true for Graph.Features.ElementFeatures.supportsCustomIds() ()} then it should support filters as with:

• g.edges(e)
• g.edges(e.id())
• g.edges(e.id().toString())

If the graph return true for Graph.Features.ElementFeatures.supportsAnyIds() ()} then it should support filters as with:

• g.edges(e)
• g.edges(e.id())

If the graph return true for Graph.Features.ElementFeatures.supportsStringIds() ()} then it should support filters as with:

• g.edges(e)
• g.edges(e.id().toString())
• g.edges("id")

Parameters:

edgeIds - the ids of the edges to get

Returns:

an Iterator of edges that match the provided edge ids

tx

Transaction tx()

Configure and control the transactions for those graphs that support this feature. Note that this method does not indicate the creation of a "transaction" object. A Transaction in the TinkerPop context is a transaction "factory" or "controller" that helps manage transactions owned by the underlying graph database.

close

void close()
    throws Exception

Closing a Graph is equivalent to "shutdown" and implies that no further operations can be executed on the instance. Users should consult the documentation of the underlying graph database implementation for what this "shutdown" will mean in general and, if supported, how open transactions are handled. It will typically be the end user's responsibility to synchronize the thread that calls close() with other threads that are accessing open transactions. In other words, be sure that all work performed on the Graph instance is complete prior to calling this method.

TinkerPop does not enforce any particular semantics with respect to "shutdown". It is up to the graph provider to decide what this method will do.

Specified by:

close in interface AutoCloseable

Throws:

Exception

io

@Deprecated
default <I extends Io> I io(Io.Builder<I> builder)

Deprecated. As of release 3.4.0, replaced by GraphTraversalSource.io(String).

Construct a particular Io implementation for reading and writing the Graph and other data. End-users will "select" the Io implementation that they want to use by supplying the Io.Builder that constructs it. In this way, Graph vendors can supply their IoRegistry to that builder thus allowing for custom serializers to be auto-configured into the Io instance. Registering custom serializers is particularly useful for those graphs that have complex types for Element identifiers.

For those graphs that do not need to register any custom serializers, the default implementation should suffice. If the default is overridden, take care to register the current graph via the Io.Builder.graph(Graph) method.

variables

Graph.Variables variables()

A collection of global Graph.Variables associated with the graph. Variables are used for storing metadata about the graph.

Returns:

The variables associated with this graph

configuration

Configuration configuration()

Get the Configuration associated with the construction of this graph. Whatever configuration was passed to GraphFactory.open(Configuration) is what should be returned by this method.

Returns:

the configuration used during graph construction.

features

default Graph.Features features()

Gets the Graph.Features exposed by the underlying Graph implementation.