org.apache.tinkerpop.gremlin.structure.util.star

Class StarGraph

java.lang.Object

org.apache.tinkerpop.gremlin.structure.util.star.StarGraph

All Implemented Interfaces:

Serializable, AutoCloseable, Graph, Host

public final class StarGraph
extends Object
implements Graph, Serializable

A StarGraph is a form of Attachable (though the Graph implementation does not implement that interface itself). It is a very limited Graph implementation that holds a single Vertex and its related properties and edges (and their properties). It is designed to be an efficient memory representation of this data structure, thus making it good for network and disk-based serialization.

Author:

Marko A. Rodriguez (http://markorodriguez.com)

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	StarGraph.Builder StarGraph builder with options to customize its internals
class	StarGraph.StarAdjacentVertex
class	StarGraph.StarEdge
class	StarGraph.StarElement<E extends Element>
static class	StarGraph.StarGraphFeatures
class	StarGraph.StarInEdge
class	StarGraph.StarOutEdge
class	StarGraph.StarProperty<V>
class	StarGraph.StarVertex
class	StarGraph.StarVertexProperty<V>

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

Modifier and Type	Field and Description
protected boolean	compareIdsUsingStrings
protected Map<Object,Map<String,Object>>	edgeProperties
protected boolean	internStrings
protected Map<Object,Map<String,Object>>	metaProperties
protected Long	nextId
protected StarGraph.StarVertex	starVertex

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.
Optional<StarGraph>	applyGraphFilter(GraphFilter graphFilter)
static StarGraph.Builder	build()
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.
org.apache.commons.configuration2.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.
Graph.Features	features() Gets the Graph.Features exposed by the underlying Graph implementation.
StarGraph.StarVertex	getStarVertex() Gets the Vertex representative of the StarGraph.
static StarGraph	of(Vertex vertex) Creates a new StarGraph from a Vertex.
static StarGraph	open() Creates an empty StarGraph.
String	toString()
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 class java.lang.Object

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

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

addVertex, io, traversal, traversal, tx

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

getHostingVertex

Field Detail

nextId

protected Long nextId

starVertex

protected StarGraph.StarVertex starVertex

edgeProperties

protected Map<Object,Map<String,Object>> edgeProperties

metaProperties

protected Map<Object,Map<String,Object>> metaProperties

internStrings

protected final boolean internStrings

compareIdsUsingStrings

protected final boolean compareIdsUsingStrings

Method Detail

getStarVertex

public StarGraph.StarVertex getStarVertex()

Gets the Vertex representative of the StarGraph.

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)
                                    throws IllegalArgumentException

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

Throws:

IllegalArgumentException - if the provided GraphComputer class is not supported.

compute

public GraphComputer compute()
                      throws IllegalArgumentException

Description copied from interface: Graph

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

Specified by:

compute in interface Graph

Returns:

A default graph computer

Throws:

IllegalArgumentException - if there is no default graph computer

vertices

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

Description copied from interface: Graph

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")

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 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")

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

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 org.apache.commons.configuration2.Configuration configuration()

Description copied from interface: Graph

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.

Specified by:

configuration in interface Graph

Returns:

the configuration used during graph construction.

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

close

public void close()
           throws Exception

Description copied from interface: Graph

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

Specified by:

close in interface Graph

Throws:

Exception

toString

public String toString()

Overrides:

toString in class Object

open

public static StarGraph open()

Creates an empty StarGraph.

of

public static StarGraph of(Vertex vertex)

Creates a new StarGraph from a Vertex.

build

public static StarGraph.Builder build()

applyGraphFilter

public Optional<StarGraph> applyGraphFilter(GraphFilter graphFilter)