Class Filter

Represents a Filter.

Inheritance
object
Filter
Implements
Inherited Members
Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRdf.dll
Syntax
public class Filter : IFilter, IUnaryOperator, ISparqlAlgebra, IVisitable, IProcessable

Constructors

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Filter(ISparqlAlgebra, ISparqlFilter)

Creates a new Filter.

Declaration
public Filter(ISparqlAlgebra pattern, ISparqlFilter filter)
Parameters
Type Name Description
ISparqlAlgebra pattern

Algebra the Filter applies over.
ISparqlFilter filter

Filter to apply.

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
IEnumerable<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
IEnumerable<string>
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InnerAlgebra

Gets the Inner Algebra.

Declaration
public ISparqlAlgebra InnerAlgebra { get; }
Property Value
Type Description
ISparqlAlgebra
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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
IEnumerable<string>

Methods

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Accept<T>(ISparqlAlgebraVisitor<T>)

Accept a simple algebra visitor.

Declaration
public T Accept<T>(ISparqlAlgebraVisitor<T> visitor)
Parameters
Type Name Description
ISparqlAlgebraVisitor<T> visitor

The visitor implementation.
Returns
Type Description
T
Type Parameters
Name Description
T

The type returned by the Visit methods of the visitor.
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Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)

Called by an algebra visitor to process an item by invoking the appropriate method on the processor passed in.

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

The processor to invoke.
TContext context

The context to pass to the processor.
Returns
Type Description
TResult

The result of invoking the processor method.
Type Parameters
Name Description
TResult

The type of result returned by the processor.
TContext

The type of the context object to be provided to the processor.
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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
string
Overrides
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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