Class LeftJoin

Represents a LeftJoin predicated on an arbitrary filter expression.
Inheritance
System.Object
LeftJoin
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 LeftJoin : ILeftJoin, IAbstractJoin, ISparqlAlgebra

Constructors

| Improve this Doc View Source

LeftJoin(ISparqlAlgebra, ISparqlAlgebra)

Creates a new LeftJoin where there is no Filter over the join.
Declaration
public LeftJoin(ISparqlAlgebra lhs, ISparqlAlgebra rhs)
Parameters
Type Name Description
ISparqlAlgebra lhs LHS Pattern.
ISparqlAlgebra rhs RHS Pattern.
| Improve this Doc View Source

LeftJoin(ISparqlAlgebra, ISparqlAlgebra, ISparqlFilter)

Creates a new LeftJoin where there is a Filter over the join.
Declaration
public LeftJoin(ISparqlAlgebra lhs, ISparqlAlgebra rhs, ISparqlFilter filter)
Parameters
Type Name Description
ISparqlAlgebra lhs LHS Pattern.
ISparqlAlgebra rhs RHS Pattern.
ISparqlFilter filter Filter to decide which RHS solutions are valid.

Properties

| Improve this Doc View Source

Filter

Gets the Filter that applies across the Join.
Declaration
public ISparqlFilter Filter { get; }
Property Value
Type Description
ISparqlFilter
| Improve this Doc View Source

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>
| Improve this Doc View Source

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>
| Improve this Doc View Source

Lhs

Gets the LHS of the Join.
Declaration
public ISparqlAlgebra Lhs { get; }
Property Value
Type Description
ISparqlAlgebra
| Improve this Doc View Source

Rhs

Gets the RHS of the Join.
Declaration
public ISparqlAlgebra Rhs { get; }
Property Value
Type Description
ISparqlAlgebra
| Improve this Doc View Source

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

| Improve this Doc View Source

Evaluate(SparqlEvaluationContext)

Evaluates the LeftJoin.
Declaration
public BaseMultiset Evaluate(SparqlEvaluationContext context)
Parameters
Type Name Description
SparqlEvaluationContext context Evaluation Context.
Returns
Type Description
BaseMultiset
| Improve this Doc View Source

ToGraphPattern()

Converts the Algebra back to a SPARQL Query.
Declaration
public GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
| Improve this Doc View Source

ToQuery()

Converts the Algebra back to a SPARQL Query.
Declaration
public SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
| Improve this Doc View Source

ToString()

Gets the String representation of the Algebra.
Declaration
public override string ToString()
Returns
Type Description
System.String
Overrides
System.Object.ToString()
| Improve this Doc View Source

Transform(IAlgebraOptimiser)

Transforms both sides of the Join using the given Optimiser.
Declaration
public ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser Optimser.
Returns
Type Description
ISparqlAlgebra
| Improve this Doc View Source

TransformLhs(IAlgebraOptimiser)

Transforms the LHS of the Join using the given Optimiser.
Declaration
public ISparqlAlgebra TransformLhs(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser Optimser.
Returns
Type Description
ISparqlAlgebra
| Improve this Doc View Source

TransformRhs(IAlgebraOptimiser)

Transforms the RHS of the Join using the given Optimiser.
Declaration
public ISparqlAlgebra TransformRhs(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser Optimser.
Returns
Type Description
ISparqlAlgebra

Implements

Extension Methods