Select Class

Represents the Selection step of Query Evaluation.

Inheritance Hierarchy

SystemObject
VDS.RDF.Query.AlgebraSelect

Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRDF (in dotNetRDF.dll) Version:

Syntax

public class Select : IUnaryOperator, ISparqlAlgebra

Public Class Select
	Implements IUnaryOperator, ISparqlAlgebra

The Select type exposes the following members.

Constructors

	Name	Description
	Select	Creates a new Select.

Properties

	Name	Description
	FixedVariables	Gets the enumeration of fixed variables in the algebra i.e. variables that are guaranteed to have a bound value.
	FloatingVariables	Gets the enumeration of floating variables in the algebra i.e. variables that are not guaranteed to have a bound value.
	InnerAlgebra	Gets the Inner Algebra.
	IsSelectAll	Does this operator select all variables?.
	SparqlVariables	Gets the SPARQL Variables used.
	Variables	Gets the Variables used in the Algebra.

Methods

	Name	Description
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Evaluate	Trims the Results of evaluating the inner pattern to remove Variables which are not Result Variables.
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToGraphPattern	Throws an error as a Select() cannot be converted back to a Graph Pattern.
	ToQuery	Converts the Algebra back to a SPARQL Query.
	ToString	Gets the String representation of the Algebra. (Overrides ObjectToString.)
	Transform	Transforms the Inner Algebra using the given Optimiser.

Remarks

Selection trims variables from the Multiset that are not needed in the final output.