Class LazyUnion

Represents a Union.

Inheritance

System.Object

LazyUnion

Implements

IUnion

IAbstractJoin

ISparqlAlgebra

IVisitable

IProcessable

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 LazyUnion : IUnion, IAbstractJoin, ISparqlAlgebra, IVisitable, IProcessable

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

Constructors

LazyUnion(ISparqlAlgebra, ISparqlAlgebra, int)

Creates a new Lazy Union.

Declaration

public LazyUnion(ISparqlAlgebra lhs, ISparqlAlgebra rhs, int requiredResults)

Parameters

Type	Name	Description
ISparqlAlgebra	lhs	LHS Pattern.
ISparqlAlgebra	rhs	RHS Pattern.
int	requiredResults	The number of results that the Union should attempt to return.

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

LazyUnion(ISparqlAlgebra, ISparqlAlgebra)

Creates a new Lazy Union.

Declaration

public LazyUnion(ISparqlAlgebra lhs, ISparqlAlgebra rhs)

Parameters

Type	Name	Description
ISparqlAlgebra	lhs	LHS Pattern.
ISparqlAlgebra	rhs	RHS Pattern.

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

Properties

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>

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

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>

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

Lhs

Gets the LHS of the Join.

Declaration

public ISparqlAlgebra Lhs { get; }

Property Value

Type	Description
ISparqlAlgebra

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

RequiredResults

Declaration

public int RequiredResults { get; }

Property Value

Type	Description
int

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

Rhs

Gets the RHS of the Join.

Declaration

public ISparqlAlgebra Rhs { get; }

Property Value

Type	Description
ISparqlAlgebra

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

Variables

Gets the Variables used in the Algebra.

Declaration

public IEnumerable<string> Variables { get; }

Property Value

Type	Description
System.Collections.Generic.IEnumerable<T><string>

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

Methods

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

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

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

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

Evaluate(SparqlEvaluationContext)

Evaluates the Lazy Union.

Declaration

public BaseMultiset Evaluate(SparqlEvaluationContext context)

Parameters

Type	Name	Description
SparqlEvaluationContext	context	Evaluation Context.

Returns

Type	Description
BaseMultiset

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

ToGraphPattern()

Converts the Union back to Graph Patterns.

Declaration

public GraphPattern ToGraphPattern()

Returns

Type	Description
GraphPattern

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

ToQuery()

Converts the Algebra back to a SPARQL Query.

Declaration

public SparqlQuery ToQuery()

Returns

Type	Description
SparqlQuery

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

ToString()

Gets the String representation of the Algebra.

Declaration

public override string ToString()

Returns

Type	Description
string

Overrides

object.ToString()

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

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

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

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

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

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

Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

Implements

IUnion

IAbstractJoin

ISparqlAlgebra

IVisitable

IProcessable

Extension Methods

Extensions.ToSafeString(object)

Extensions.AsEnumerable<T>(T)