Class AskBgp

Represents a BGP which is a set of Triple Patterns.
Inheritance
System.Object
AskBgp
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 AskBgp : IBgp, ITerminalOperator, ISparqlAlgebra
Remarks

An Ask BGP differs from a BGP in that rather than evaluating each Triple Pattern in turn it evaluates across all Triple Patterns. This is used for ASK queries where we are only concerned with whether a BGP matches and not in the specific solutions.

An Ask BGP can only contain concrete Triple Patterns and/or FILTERs and not any of the other specialised Triple Pattern classes.

Constructors

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AskBgp(IEnumerable<ITriplePattern>)

Creates a Streamed BGP containing a set of Triple Patterns.
Declaration
public AskBgp(IEnumerable<ITriplePattern> ps)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<ITriplePattern> ps Triple Patterns.
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AskBgp(ITriplePattern)

Creates a Streamed BGP containing a single Triple Pattern.
Declaration
public AskBgp(ITriplePattern p)
Parameters
Type Name Description
ITriplePattern p Triple Pattern.

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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IsEmpty

Gets whether the BGP is the emtpy BGP.
Declaration
public bool IsEmpty { get; }
Property Value
Type Description
System.Boolean
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PatternCount

Gets the number of Triple Patterns in the BGP.
Declaration
public int PatternCount { get; }
Property Value
Type Description
System.Int32
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TriplePatterns

Gets the Triple Patterns in the BGP.
Declaration
public IEnumerable<ITriplePattern> TriplePatterns { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<ITriplePattern>
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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 the BGP against the Evaluation Context.
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 BGP 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()

Implements

Extension Methods