Class SubQuery

Represents a sub-query as an Algebra operator (only used when strict algebra is generated).

Inheritance
object
SubQuery
Implements
Inherited Members
Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRdf.dll
Syntax
public class SubQuery : ITerminalOperator, ISparqlAlgebra, IVisitable, IProcessable

Constructors

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SubQuery(SparqlQuery)

Creates a new sub-query operator.

Declaration
public SubQuery(SparqlQuery q)
Parameters
Type Name Description
SparqlQuery q

Sub-query.

Properties

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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
IEnumerable<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
IEnumerable<string>
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Query

Get the sub-query.

Declaration
public SparqlQuery Query { get; }
Property Value
Type Description
SparqlQuery
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Variables

Gets the variables used in the sub-query which are projected out of it.

Declaration
public IEnumerable<string> Variables { get; }
Property Value
Type Description
IEnumerable<string>

Methods

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Accept<T>(ISparqlAlgebraVisitor<T>)

Accept a simple algebra visitor.

Declaration
public T Accept<T>(ISparqlAlgebraVisitor<T> visitor)
Parameters
Type Name Description
ISparqlAlgebraVisitor<T> visitor

The visitor implementation.
Returns
Type Description
T
Type Parameters
Name Description
T

The type returned by the Visit methods of the visitor.
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Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)

Called by an algebra visitor to process an item by invoking the appropriate method on the processor passed in.

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

The processor to invoke.
TContext context

The context to pass to the processor.
Returns
Type Description
TResult

The result of invoking the processor method.
Type Parameters
Name Description
TResult

The type of result returned by the processor.
TContext

The type of the context object to be provided to the processor.
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ToGraphPattern()

Converts the algebra back into a sub-query.

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

Converts the algebra back into a 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

Implements

Extension Methods