Class UnionGraph

A Graph which represents the Union of several Graphs.

Inheritance
System.Object
BaseGraph
Graph
UnionGraph
Implements
System.IDisposable
System.IEquatable<T><IGraph>
System.IEquatable<T><Graph>
Inherited Members
object.Equals(object)
object.Equals(object, object)
object.GetHashCode()
object.GetType()
object.MemberwiseClone()
object.ReferenceEquals(object, object)
object.ToString()
Namespace: VDS.RDF
Assembly: dotNetRdf.dll
Syntax
public class UnionGraph : Graph, IGraph, INodeFactory, IDisposable, ITripleIndex, IEquatable<IGraph>, IEquatable<Graph>
Remarks

The Union is entirely virtual, the Graphs and their Triples are not actually physically merged together.

All Assert and Retract operations are directed only to the Default Graph while a Clear() operation will clear all Graphs in the Union.

Constructors

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UnionGraph(IGraph, IEnumerable<IGraph>)

Creates a new Union Graph which is the Union of all the given Graphs with a specific Default Graph.

Declaration
public UnionGraph(IGraph defaultGraph, IEnumerable<IGraph> graphs)
Parameters
Type Name Description
IGraph defaultGraph

Default Graph of the Union.
System.Collections.Generic.IEnumerable<T><IGraph> graphs

Other Graphs in the Union.
Remarks

The Union is entirely virtual, the Graphs and their Triples are not actually physically merged together.

All Assert and Retract operations are directed only to the Default Graph while a Clear() operation will clear all Graphs in the Union.

Properties

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Nodes

Gets the Nodes of the Graph.

Declaration
public override IEnumerable<INode> Nodes { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<T><INode>
Overrides
Remarks

The Union is entirely virtual, the Graphs and their Triples are not actually physically merged together.

All Assert and Retract operations are directed only to the Default Graph while a Clear() operation will clear all Graphs in the Union.

Methods

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Assert(IEnumerable<Triple>)

Asserts some Triples in the Graph.

Declaration
public override bool Assert(IEnumerable<Triple> ts)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T><Triple> ts

Triples.
Returns
Type Description
System.Boolean
Overrides
Remarks

Assert and Retract operations are directed to the Default Graph of the Union. We have to override the method to do this as although the UnionTripleCollection will direct asserts/retracts to Triple Collection of the default Graph we cannot guarantee that the Graph will be able to carry out any assertion/retraction logic (e.g. persistence) it might have implemented if the Assert/Retract bypasses the Assert/Retract method of the Default Graph.

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Assert(Triple)

Asserts s Triple in the Graph.

Declaration
public override bool Assert(Triple t)
Parameters
Type Name Description
Triple t

Triple.
Returns
Type Description
System.Boolean
Overrides
Remarks

Assert and Retract operations are directed to the Default Graph of the Union. We have to override the method to do this as although the UnionTripleCollection will direct asserts/retracts to Triple Collection of the default Graph we cannot guarantee that the Graph will be able to carry out any assertion/retraction logic (e.g. persistence) it might have implemented if the Assert/Retract bypasses the Assert/Retract method of the Default Graph.

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Clear()

Clears all the Graphs in the Union.

Declaration
public override void Clear()
Overrides
Remarks

The Union is entirely virtual, the Graphs and their Triples are not actually physically merged together.

All Assert and Retract operations are directed only to the Default Graph while a Clear() operation will clear all Graphs in the Union.

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Retract(IEnumerable<Triple>)

Retracts some Triples from the Graph.

Declaration
public override bool Retract(IEnumerable<Triple> ts)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T><Triple> ts

Triples.
Returns
Type Description
System.Boolean
Overrides
Remarks

Assert and Retract operations are directed to the Default Graph of the Union. We have to override the method to do this as although the UnionTripleCollection will direct asserts/retracts to Triple Collection of the default Graph we cannot guarantee that the Graph will be able to carry out any assertion/retraction logic (e.g. persistence) it might have implemented if the Assert/Retract bypasses the Assert/Retract method of the Default Graph.

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Retract(Triple)

Retracts a Triple from the Graph.

Declaration
public override bool Retract(Triple t)
Parameters
Type Name Description
Triple t

Triple.
Returns
Type Description
System.Boolean
Overrides
Remarks

Assert and Retract operations are directed to the Default Graph of the Union. We have to override the method to do this as although the UnionTripleCollection will direct asserts/retracts to Triple Collection of the default Graph we cannot guarantee that the Graph will be able to carry out any assertion/retraction logic (e.g. persistence) it might have implemented if the Assert/Retract bypasses the Assert/Retract method of the Default Graph.

Implements

System.IDisposable
System.IEquatable<T>
System.IEquatable<T>

Extension Methods