Class SparqlBuiltInFunctionFactory

Expression Factory which generates SPARQL Function expressions.

Inheritance

object

SparqlBuiltInFunctionFactory

Implements

ISparqlCustomExpressionFactory

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: VDS.RDF.Query.Expressions

Assembly: dotNetRdf.dll

Syntax

public class SparqlBuiltInFunctionFactory : ISparqlCustomExpressionFactory

Remarks

This supports the requirement of SPARQL 1.1 that all functions can be accessed via URI as well as by keyword. This also means that SPARQL 1.1 functions can be used in SPARQL 1.0 mode by using their URIs instead of their keywords and they are then treated simply as extension functions.

Fields

SparqlFunctionsNamespace

Namespace Uri for SPARQL Built In Functions Namespace.

Declaration

public const string SparqlFunctionsNamespace = "http://www.w3.org/ns/sparql#"

Field Value

Type	Description
string

Properties

AvailableExtensionAggregates

Gets the URIs of available SPARQL Aggregates.

Declaration

public IEnumerable<Uri> AvailableExtensionAggregates { get; }

Property Value

Type	Description
IEnumerable<Uri>

AvailableExtensionFunctions

Gets the URIs of available SPARQL Functions.

Declaration

public IEnumerable<Uri> AvailableExtensionFunctions { get; }

Property Value

Type	Description
IEnumerable<Uri>

Methods

TryCreateExpression(Uri, List<ISparqlExpression>, Dictionary<string, ISparqlExpression>, out ISparqlExpression)

Tries to create a SPARQL Function expression if the function Uri correseponds to a supported SPARQL Function.

Declaration

public bool TryCreateExpression(Uri u, List<ISparqlExpression> args, Dictionary<string, ISparqlExpression> scalarArguments, out ISparqlExpression expr)

Parameters

Type	Name	Description
Uri	u	Function Uri.
List<ISparqlExpression>	args	Function Arguments.
Dictionary<string, ISparqlExpression>	scalarArguments	Scalar Arguments.
ISparqlExpression	expr	Generated Expression.

Returns

Type	Description
bool	Whether an expression was successfully generated.

Implements

ISparqlCustomExpressionFactory

Extension Methods

Extensions.ToSafeString(object)

Extensions.AsEnumerable<T>(T)