org.apache.tinkerpop.gremlin.structure.util.empty

Class EmptyGraph

java.lang.Object

org.apache.tinkerpop.gremlin.structure.util.empty.EmptyGraph

All Implemented Interfaces:

AutoCloseable, Graph, Host

public final class EmptyGraph
extends Object
implements Graph

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	EmptyGraph.EmptyGraphFeatures Features defined such that they support immutability but allow all other possibilities.

Nested classes/interfaces inherited from interface org.apache.tinkerpop.gremlin.structure.Graph

Graph.Exceptions, Graph.Features, Graph.Hidden, Graph.OptIn, Graph.OptIns, Graph.OptOut, Graph.OptOuts, Graph.Variables

Field Summary

Fields inherited from interface org.apache.tinkerpop.gremlin.structure.Graph

GRAPH

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.
void	close()
GraphComputer	compute()
<C extends GraphComputer> C	compute(Class<C> graphComputerClass) Declare the GraphComputer to use for OLAP operations on the graph.
Configuration	configuration() Get the org.apache.commons.configuration.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.
Graph.Features	features() Gets the Graph.Features exposed by the underlying Graph implementation.
static Graph	instance()
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.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.tinkerpop.gremlin.structure.Graph

addVertex, io, traversal, traversal

Method Detail

instance

public static Graph instance()

features

public Graph.Features features()

Description copied from interface: Graph

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

Specified by:

features in interface Graph

addVertex

public Vertex addVertex(Object... keyValues)

Description copied from interface: Graph

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.

Specified by:

addVertex in interface Graph

Parameters:

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

Returns:

The newly created vertex

compute

public <C extends GraphComputer> C compute(Class<C> graphComputerClass)

Description copied from interface: Graph

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

Specified by:

compute in interface Graph

Parameters:

graphComputerClass - The graph computer class to use.

Returns:

A graph computer for processing this graph

compute

public GraphComputer compute()

Specified by:

compute in interface Graph

tx

public Transaction tx()

Description copied from interface: Graph

Configure and control the transactions for those graphs that support this feature.

Specified by:

tx in interface Graph

variables

public Graph.Variables variables()

Description copied from interface: Graph

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

Specified by:

variables in interface Graph

Returns:

The variables associated with this graph

configuration

public Configuration configuration()

Description copied from interface: Graph

Get the org.apache.commons.configuration.Configuration associated with the construction of this graph. Whatever configuration was passed to org.apache.tinkerpop.gremlin.structure.util.GraphFactory#open(org.apache.commons.configuration.Configuration) is what should be returned by this method.

Specified by:

configuration in interface Graph

Returns:

the configuration used during graph construction.

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception

vertices

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

Description copied from interface: Graph

Get the Vertex objects in this graph with the provided vertex ids. 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.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.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.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.id().toString())
• g.vertices("id")

Specified by:

vertices in interface Graph

Parameters:

vertexIds - the ids of the vertices to get

Returns:

an Iterator of vertices that match the provided vertex ids

edges

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

Description copied from interface: Graph

Get the Edge objects in this graph with the provided edge ids. 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.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.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.id())

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

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

Specified by:

edges in interface Graph

Parameters:

edgeIds - the ids of the edges to get

Returns:

an Iterator of edges that match the provided edge ids