Class LazyBgpOptimiser

An Algebra Optimiser that optimises Algebra to use LazyBgp's wherever possible.

Inheritance

object

BaseAlgebraOptimiser

LazyBgpOptimiser

Implements

IAlgebraOptimiser

Inherited Members

BaseAlgebraOptimiser.Optimise(ISparqlAlgebra)

BaseAlgebraOptimiser.UnsafeOptimisation

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: VDS.RDF.Query.Optimisation

Assembly: dotNetRdf.dll

Syntax

public class LazyBgpOptimiser : BaseAlgebraOptimiser, IAlgebraOptimiser

Methods

IsApplicable(SparqlQuery)

Determines whether the query can be optimised for lazy evaluation.

Declaration

public override bool IsApplicable(SparqlQuery q)

Parameters

Type	Name	Description
SparqlQuery	q	Query.

Returns

Type	Description
bool

Overrides

BaseAlgebraOptimiser.IsApplicable(SparqlQuery)

IsApplicable(SparqlUpdateCommandSet)

Returns that the optimiser does not apply to SPARQL Updates.

Declaration

public override bool IsApplicable(SparqlUpdateCommandSet cmds)

Parameters

Type	Name	Description
SparqlUpdateCommandSet	cmds	Updates.

Returns

Type	Description
bool

Overrides

BaseAlgebraOptimiser.IsApplicable(SparqlUpdateCommandSet)

OptimiseInternal(ISparqlAlgebra, int)

Optimises an Algebra to a form that uses LazyBgp where possible.

Declaration

protected override ISparqlAlgebra OptimiseInternal(ISparqlAlgebra algebra, int depth)

Parameters

Type	Name	Description
ISparqlAlgebra	algebra	Algebra.
int	depth	Depth.

Returns

Type	Description
ISparqlAlgebra

Overrides

BaseAlgebraOptimiser.OptimiseInternal(ISparqlAlgebra, int)

Remarks

By transforming a query to use LazyBgp we can achieve much more efficient processing of some forms of queries.

Implements

IAlgebraOptimiser

Extension Methods

Extensions.ToSafeString(object)

Extensions.AsEnumerable<T>(T)