Class LeftJoin

Represents a LeftJoin predicated on an arbitrary filter expression.

Inheritance
System.Object
LeftJoin
Implements
Inherited Members
object.Equals(object)
object.Equals(object, object)
object.GetHashCode()
object.GetType()
object.MemberwiseClone()
object.ReferenceEquals(object, object)
Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRdf.dll
Syntax
public class LeftJoin : ILeftJoin, IAbstractJoin, ISparqlAlgebra, IVisitable, IProcessable

Constructors

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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.
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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.

Properties

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Filter

Gets the Filter that applies across the Join.

Declaration
public ISparqlFilter Filter { get; }
Property Value
Type Description
ISparqlFilter
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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<T><string>
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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<T><string>
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Lhs

Gets the LHS of the Join.

Declaration
public ISparqlAlgebra Lhs { get; }
Property Value
Type Description
ISparqlAlgebra
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Rhs

Gets the RHS of the Join.

Declaration
public ISparqlAlgebra Rhs { get; }
Property Value
Type Description
ISparqlAlgebra
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Variables

Gets the Variables used in the Algebra.

Declaration
public IEnumerable<string> Variables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<T><string>

Methods

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Accept<T>(ISparqlAlgebraVisitor<T>)

Declaration
public T Accept<T>(ISparqlAlgebraVisitor<T> visitor)
Parameters
Type Name Description
ISparqlAlgebraVisitor<T> visitor
Returns
Type Description
T
Type Parameters
Name Description
T
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Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)

Declaration
public TResult Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext> processor, TContext context)
Parameters
Type Name Description
ISparqlQueryAlgebraProcessor<TResult, TContext> processor
TContext context
Returns
Type Description
TResult
Type Parameters
Name Description
TResult
TContext
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ToGraphPattern()

Converts the Algebra back to a SPARQL Query.

Declaration
public GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
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ToQuery()

Converts the Algebra back to a SPARQL Query.

Declaration
public SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
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ToString()

Gets the String representation of the Algebra.

Declaration
public override string ToString()
Returns
Type Description
string
Overrides
object.ToString()
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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
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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
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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