Class FilteredProduct

Algebra operator which combines a Filter and a Product into a single operation for improved performance and reduced memory usage.

Inheritance
System.Object
FilteredProduct
Implements
Inherited Members
object.Equals(object)
object.Equals(object, object)
object.GetHashCode()
object.GetType()
object.MemberwiseClone()
object.ReferenceEquals(object, object)
Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRdf.dll
Syntax
public class FilteredProduct : IAbstractJoin, ISparqlAlgebra, IVisitable, IProcessable

Constructors

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FilteredProduct(ISparqlAlgebra, ISparqlAlgebra, ISparqlExpression)

Creates a new Filtered Product.

Declaration
public FilteredProduct(ISparqlAlgebra lhs, ISparqlAlgebra rhs, ISparqlExpression expr)
Parameters
Type Name Description
ISparqlAlgebra lhs

LHS Algebra.
ISparqlAlgebra rhs

RHS Algebra.
ISparqlExpression expr

Expression to filter with.

Properties

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FilterExpression

Declaration
public ISparqlExpression FilterExpression { get; }
Property Value
Type Description
ISparqlExpression
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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<T><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<T><string>
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Lhs

Gets the LHS Algebra.

Declaration
public ISparqlAlgebra Lhs { get; }
Property Value
Type Description
ISparqlAlgebra
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Rhs

Gets the RHS Algebra.

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<T><string>

Methods

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Accept<T>(ISparqlAlgebraVisitor<T>)

Declaration
public T Accept<T>(ISparqlAlgebraVisitor<T> visitor)
Parameters
Type Name Description
ISparqlAlgebraVisitor<T> visitor
Returns
Type Description
T
Type Parameters
Name Description
T
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Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)

Declaration
public TResult Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext> processor, TContext context)
Parameters
Type Name Description
ISparqlQueryAlgebraProcessor<TResult, TContext> processor
TContext context
Returns
Type Description
TResult
Type Parameters
Name Description
TResult
TContext
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ToGraphPattern()

Converts the algebra back into a Graph Pattern.

Declaration
public GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
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ToQuery()

Converts the algebra back into a query.

Declaration
public SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
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ToString()

Gets the string represenation of the algebra.

Declaration
public override string ToString()
Returns
Type Description
string
Overrides
object.ToString()
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Transform(IAlgebraOptimiser)

Transforms the inner algebra with the given optimiser.

Declaration
public ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser

Algebra Optimiser.
Returns
Type Description
ISparqlAlgebra
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TransformLhs(IAlgebraOptimiser)

Transforms the LHS algebra only with the given optimiser.

Declaration
public ISparqlAlgebra TransformLhs(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser

Algebra Optimiser.
Returns
Type Description
ISparqlAlgebra
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TransformRhs(IAlgebraOptimiser)

Transforms the RHS algebra only with the given optimiser.

Declaration
public ISparqlAlgebra TransformRhs(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser

Algebra Optimiser.
Returns
Type Description
ISparqlAlgebra

Implements

Extension Methods