Class LazyBgp

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

A Lazy 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 queries where we are only want to retrieve a limited number of solutions.

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

Constructors

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LazyBgp(IEnumerable<ITriplePattern>)

Creates a Streamed BGP containing a set of Triple Patterns.
Declaration
public LazyBgp(IEnumerable<ITriplePattern> ps)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<ITriplePattern> ps Triple Patterns.
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LazyBgp(IEnumerable<ITriplePattern>, Int32)

Creates a Streamed BGP containing a set of Triple Patterns.
Declaration
public LazyBgp(IEnumerable<ITriplePattern> ps, int requiredResults)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<ITriplePattern> ps Triple Patterns.
System.Int32 requiredResults The number of Results the BGP should attempt to return.
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LazyBgp(ITriplePattern)

Creates a Streamed BGP containing a single Triple Pattern.
Declaration
public LazyBgp(ITriplePattern p)
Parameters
Type Name Description
ITriplePattern p Triple Pattern.
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LazyBgp(ITriplePattern, Int32)

Creates a Streamed BGP containing a single Triple Pattern.
Declaration
public LazyBgp(ITriplePattern p, int requiredResults)
Parameters
Type Name Description
ITriplePattern p Triple Pattern.
System.Int32 requiredResults The number of Results the BGP should attempt to return.

Methods

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Evaluate(SparqlEvaluationContext)

Evaluates the BGP against the Evaluation Context.
Declaration
public override BaseMultiset Evaluate(SparqlEvaluationContext context)
Parameters
Type Name Description
SparqlEvaluationContext context Evaluation Context.
Returns
Type Description
BaseMultiset
Overrides
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ToString()

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

Implements

Extension Methods