Class ExistsJoin

Represents a LeftJoin predicated on the existence/non-existence of joinable sets on the RHS for each item on the LHS.
Inheritance
System.Object
ExistsJoin
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 ExistsJoin : IExistsJoin, IAbstractJoin, ISparqlAlgebra

Constructors

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ExistsJoin(ISparqlAlgebra, ISparqlAlgebra, Boolean)

Creates a new Exists Join.
Declaration
public ExistsJoin(ISparqlAlgebra lhs, ISparqlAlgebra rhs, bool mustExist)
Parameters
Type Name Description
ISparqlAlgebra lhs LHS Pattern.
ISparqlAlgebra rhs RHS Pattern.
System.Boolean mustExist Whether a joinable set must exist on the RHS for the LHS set to be preserved.

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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Lhs

Gets the LHS of the Join.
Declaration
public ISparqlAlgebra Lhs { get; }
Property Value
Type Description
ISparqlAlgebra
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MustExist

Gets whether this is an EXISTS join.
Declaration
public bool MustExist { get; }
Property Value
Type Description
System.Boolean
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Rhs

Gets the RHS of the Join.
Declaration
public ISparqlAlgebra Rhs { 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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Evaluate(SparqlEvaluationContext)

Evaluates an ExistsJoin.
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 both sides of the Join using the given Optimiser.
Declaration
public ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser Optimser.
Returns
Type Description
ISparqlAlgebra
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TransformLhs(IAlgebraOptimiser)

Transforms the LHS of the Join using the given Optimiser.
Declaration
public ISparqlAlgebra TransformLhs(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser Optimser.
Returns
Type Description
ISparqlAlgebra
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TransformRhs(IAlgebraOptimiser)

Transforms the RHS of the Join using the given Optimiser.
Declaration
public ISparqlAlgebra TransformRhs(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser Optimser.
Returns
Type Description
ISparqlAlgebra

Implements

Extension Methods