Class VariableRestrictionFilter

Abstract Base Class for specialised Filters which restrict the value of a variable to some values.
Inheritance
System.Object
VariableRestrictionFilter
SingleValueRestrictionFilter
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 abstract class VariableRestrictionFilter : IFilter, IUnaryOperator, ISparqlAlgebra

Constructors

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VariableRestrictionFilter(ISparqlAlgebra, String, ISparqlFilter)

Creates a new Variable Restriction Filter.
Declaration
public VariableRestrictionFilter(ISparqlAlgebra pattern, string var, ISparqlFilter filter)
Parameters
Type Name Description
ISparqlAlgebra pattern Algebra the filter applies over.
System.String var Variable to restrict on.
ISparqlFilter filter Filter to use.

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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InnerAlgebra

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

Gets the Variable that this filter restricts the value of.
Declaration
public string RestrictionVariable { get; }
Property Value
Type Description
System.String
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SparqlFilter

Gets the Filter to be used.
Declaration
public ISparqlFilter SparqlFilter { get; }
Property Value
Type Description
ISparqlFilter
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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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Evaluate(SparqlEvaluationContext)

Evalutes the algebra for the given evaluation context.
Declaration
public abstract 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 FILTER.
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 abstract ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser Optimiser.
Returns
Type Description
ISparqlAlgebra

Implements

Extension Methods