Class Extend

Represents an Extend operation which is the formal algebraic form of the BIND operation.

Inheritance
System.Object
Extend
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 Extend : IUnaryOperator, ISparqlAlgebra, IVisitable, IProcessable

Constructors

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Extend(ISparqlAlgebra, ISparqlExpression, string)

Creates a new Extend operator.

Declaration
public Extend(ISparqlAlgebra pattern, ISparqlExpression expr, string var)
Parameters
Type Name Description
ISparqlAlgebra pattern

Pattern.
ISparqlExpression expr

Expression.
string var

Variable to bind to.

Properties

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AssignExpression

Gets the Assignment Expression.

Declaration
public ISparqlExpression AssignExpression { get; }
Property Value
Type Description
ISparqlExpression
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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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InnerAlgebra

Gets the Inner Algebra.

Declaration
public ISparqlAlgebra InnerAlgebra { get; }
Property Value
Type Description
ISparqlAlgebra
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VariableName

Gets the Variable Name to be bound.

Declaration
public string VariableName { get; }
Property Value
Type Description
string
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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 to a Graph Pattern.

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

Converts the Algebra to a Query.

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

Gets the String representation of the Extend.

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

Transforms the Inner Algebra using the given Optimiser.

Declaration
public ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser

Optimiser.
Returns
Type Description
ISparqlAlgebra

Implements

Extension Methods