Class FilterPattern

Class for representing Filter Patterns in SPARQL Queries.

Inheritance
object
BaseTriplePattern
FilterPattern
Implements
Inherited Members
Namespace: VDS.RDF.Query.Patterns
Assembly: dotNetRdf.dll
Syntax
public class FilterPattern : BaseTriplePattern, IFilterPattern, ITriplePattern, IComparable<ITriplePattern>, IProcessable, IVisitable, IComparable<IFilterPattern>, IComparable<FilterPattern>
Remarks

A Filter Pattern is any FILTER clause that can be executed during the process of executing Triple Patterns rather than after all the Triple Patterns and Child Graph Patterns have been executed.

Constructors

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FilterPattern(ISparqlFilter)

Creates a new Filter Pattern with the given Filter.

Declaration
public FilterPattern(ISparqlFilter filter)
Parameters
Type Name Description
ISparqlFilter filter

Filter.

Properties

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Filter

Gets the Filter that this Pattern uses.

Declaration
public ISparqlFilter Filter { get; }
Property Value
Type Description
ISparqlFilter
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FixedVariables

Returns the empty enumerable as don't know which variables will be bound.

Declaration
public override IEnumerable<string> FixedVariables { get; }
Property Value
Type Description
IEnumerable<string>
Overrides
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FloatingVariables

Returns the empty enumerable as don't know which variables will be bound.

Declaration
public override IEnumerable<string> FloatingVariables { get; }
Property Value
Type Description
IEnumerable<string>
Overrides
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HasNoBlankVariables

Returns true as a FILTER cannot contain blank variables.

Declaration
public override bool HasNoBlankVariables { get; }
Property Value
Type Description
bool
Overrides
Remarks

Technically blank nodes may appear in a FILTER as part of an EXISTS/NOT EXISTS clause but in that case they would not be visible outside of the FILTER and so are not relevant.

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IsAcceptAll

Returns that the Pattern is not an accept all (since it's a Filter).

Declaration
public override bool IsAcceptAll { get; }
Property Value
Type Description
bool
Overrides
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PatternType

Gets the Pattern Type.

Declaration
public override TriplePatternType PatternType { get; }
Property Value
Type Description
TriplePatternType
Overrides
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UsesDefaultDataset

Gets whether the Pattern uses the Default Dataset.

Declaration
public override bool UsesDefaultDataset { get; }
Property Value
Type Description
bool
Overrides

Methods

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Accept<T>(ISparqlAlgebraVisitor<T>)

Accept a simple algebra visitor.

Declaration
public override 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.
Overrides
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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 override 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.
Overrides
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CompareTo(FilterPattern)

Compares a filter pattern to another.

Declaration
public int CompareTo(FilterPattern other)
Parameters
Type Name Description
FilterPattern other

Pattern.
Returns
Type Description
int
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CompareTo(IFilterPattern)

Compares a filter pattern to another.

Declaration
public int CompareTo(IFilterPattern other)
Parameters
Type Name Description
IFilterPattern other

Pattern.
Returns
Type Description
int
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ToString()

Returns the string representation of the Pattern.

Declaration
public override string ToString()
Returns
Type Description
string
Overrides

Implements

Extension Methods