Class FilterPattern

Class for representing Filter Patterns in SPARQL Queries.
Inheritance
System.Object
BaseTriplePattern
FilterPattern
Implements
System.IComparable<ITriplePattern>
System.IComparable<IFilterPattern>
System.IComparable<FilterPattern>
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.Patterns
Assembly: dotNetRDF.dll
Syntax
public class FilterPattern : BaseTriplePattern, IFilterPattern, ITriplePattern, IComparable<ITriplePattern>, 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
System.Collections.Generic.IEnumerable<System.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
System.Collections.Generic.IEnumerable<System.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
System.Boolean
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
System.Boolean
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
System.Boolean
Overrides

Methods

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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
System.Int32
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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
System.Int32
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Evaluate(SparqlEvaluationContext)

Evaluates a Filter in the given Evaluation Context.
Declaration
public override void Evaluate(SparqlEvaluationContext context)
Parameters
Type Name Description
SparqlEvaluationContext context Evaluation Context.
Overrides
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ToString()

Returns the string representation of the Pattern.
Declaration
public override string ToString()
Returns
Type Description
System.String
Overrides

Implements

System.IComparable<T>
System.IComparable<T>
System.IComparable<T>

Extension Methods