Class WeightedOptimiser

The Weighted Optimiser is a Query Optimiser that orders Triple Patterns based on weighting computed calculated against.

Inheritance
System.Object
BaseQueryOptimiser
WeightedOptimiser
Implements
Inherited Members
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 WeightedOptimiser : BaseQueryOptimiser, IQueryOptimiser

Constructors

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WeightedOptimiser()

Creates a new Weighted Optimiser.

Declaration
public WeightedOptimiser()
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WeightedOptimiser(IGraph, double, double, double)

Creates a new Weighted Optimiser which reads weights from the given RDF Graph.

Declaration
public WeightedOptimiser(IGraph g, double subjWeight, double predWeight, double objWeight)
Parameters
Type Name Description
IGraph g

Graph.
double subjWeight

Default Subject Weight.
double predWeight

Default Predicate Weight.
double objWeight

Default Object Weight.
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WeightedOptimiser(IGraph)

Creates a new Weighted Optimiser which reads weights from the given RDF Graph.

Declaration
public WeightedOptimiser(IGraph g)
Parameters
Type Name Description
IGraph g

Graph.

Fields

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DefaultObjectWeight

Default Weight for Object Terms.

Declaration
public const double DefaultObjectWeight = 0.6
Field Value
Type Description
double
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DefaultPredicateWeight

Default Weight for Predicate Terms.

Declaration
public const double DefaultPredicateWeight = 0.4
Field Value
Type Description
double
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DefaultSubjectWeight

Default Weight for Subject Terms.

Declaration
public const double DefaultSubjectWeight = 0.8
Field Value
Type Description
double
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DefaultVariableWeight

Default Weight for Variables.

Declaration
public const double DefaultVariableWeight = 1
Field Value
Type Description
double

Methods

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GetRankingComparer()

Gets the comparer used to order the Triple Patterns based on their computed weightings.

Declaration
protected override IComparer<ITriplePattern> GetRankingComparer()
Returns
Type Description
System.Collections.Generic.IComparer<T><ITriplePattern>
Overrides

Implements

Extension Methods