Class Graph

Represents a GRAPH clause.
Inheritance
System.Object
Graph
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRDF.dll
Syntax
public class Graph : IUnaryOperator, ISparqlAlgebra

Constructors

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Graph(ISparqlAlgebra, IToken)

Creates a new Graph clause.
Declaration
public Graph(ISparqlAlgebra pattern, IToken graphSpecifier)
Parameters
Type Name Description
ISparqlAlgebra pattern Pattern.
IToken graphSpecifier Graph Specifier.

Properties

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FixedVariables

Gets the enumeration of fixed variables in the algebra i.e. variables that are guaranteed to have a bound value.
Declaration
public IEnumerable<string> FixedVariables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.String>
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FloatingVariables

Gets the enumeration of floating variables in the algebra i.e. variables that are not guaranteed to have a bound value.
Declaration
public IEnumerable<string> FloatingVariables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.String>
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GraphSpecifier

Gets the Graph Specifier.
Declaration
public IToken GraphSpecifier { get; }
Property Value
Type Description
IToken
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InnerAlgebra

Gets the Inner Algebra.
Declaration
public ISparqlAlgebra InnerAlgebra { get; }
Property Value
Type Description
ISparqlAlgebra
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Variables

Gets the Variables used in the Algebra.
Declaration
public IEnumerable<string> Variables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.String>

Methods

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ApplyGraph(ISparqlAlgebra, IToken)

Creates a Graph instance by applying a graph specifier to an algebra.
Declaration
public static ISparqlAlgebra ApplyGraph(ISparqlAlgebra algebra, IToken graphSpecifier)
Parameters
Type Name Description
ISparqlAlgebra algebra The algebra to be constrained.
IToken graphSpecifier A token specifying the graph constraint.
Returns
Type Description
ISparqlAlgebra A Graph instance representing the application of the graph constraint to the algebra.
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Evaluate(SparqlEvaluationContext)

Evaluates the Graph Clause by setting up the dataset, applying the pattern and then generating additional bindings if necessary.
Declaration
public BaseMultiset Evaluate(SparqlEvaluationContext context)
Parameters
Type Name Description
SparqlEvaluationContext context Evaluation Context.
Returns
Type Description
BaseMultiset
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ToGraphPattern()

Converts the Algebra back to a Graph Pattern.
Declaration
public GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
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ToQuery()

Converts the Algebra back to a SPARQL Query.
Declaration
public SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
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ToString()

Gets the String representation of the Algebra.
Declaration
public override string ToString()
Returns
Type Description
System.String
Overrides
System.Object.ToString()
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Transform(IAlgebraOptimiser)

Transforms the Inner Algebra using the given Optimiser.
Declaration
public ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser Optimiser.
Returns
Type Description
ISparqlAlgebra

Implements

Extension Methods