Class SelectDistinctGraphs

Special Algebra Construct for optimising queries of the form SELECT DISTINCT ?g WHERE {GRAPH ?g {?s ?p ?o}}.

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

Constructors

| Edit this page View Source

SelectDistinctGraphs(string)

Creates a new Select Distinct algebra.

Declaration
public SelectDistinctGraphs(string graphVar)
Parameters
Type Name Description
string graphVar

Graph Variable to bind Graph URIs to.

Properties

| Edit this page 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
IEnumerable<string>
| Edit this page 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
IEnumerable<string>
| Edit this page View Source

GraphVariable

Gets the Graph Variable to which Graph URIs are bound.

Declaration
public string GraphVariable { get; }
Property Value
Type Description
string
Remarks

If the Query supplied in the SparqlEvaluationContext is non-null then the Variable Name from the Query is used rather than this.

| Edit this page View Source

Variables

Gets the Variables used in the Algebra.

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

Methods

| Edit this page View Source

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.
| Edit this page View Source

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.
| Edit this page View Source

ToGraphPattern()

Converts the Algebra to a Graph Pattern.

Declaration
public GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
| Edit this page View Source

ToQuery()

Converts the Algebra back to a SPARQL Query.

Declaration
public SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
| Edit this page View Source

ToString()

Gets the String representation of the Algebra.

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

Implements

Extension Methods