Class UnknownFunction

Represents an Unknown Function that is not supported by dotNetRDF.
Inheritance
System.Object
UnknownFunction
Implements
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: VDS.RDF.Query.Expressions.Functions
Assembly: dotNetRDF.dll
Syntax
public class UnknownFunction : ISparqlExpression
Remarks

This exists as a placeholder class so users may choose to parse Unknown Functions and have them appear in queries even if they cannot be evaluated. This is useful when you wish to parse a query locally to check syntactic validity before passing it to an external query processor which may understand how to evaluate the function. Using this placeholder also allows queries containing Unknown Functions to still be formatted properly.

Constructors

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UnknownFunction(Uri)

Creates a new Unknown Function that has no Arguments.
Declaration
public UnknownFunction(Uri funcUri)
Parameters
Type Name Description
System.Uri funcUri Function URI.
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UnknownFunction(Uri, IEnumerable<ISparqlExpression>)

Creates a new Unknown Function that has multiple Arguments.
Declaration
public UnknownFunction(Uri funcUri, IEnumerable<ISparqlExpression> exprs)
Parameters
Type Name Description
System.Uri funcUri Function URI.
System.Collections.Generic.IEnumerable<ISparqlExpression> exprs Argument Expressions.
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UnknownFunction(Uri, ISparqlExpression)

Creates a new Unknown Function that has a Single Argument.
Declaration
public UnknownFunction(Uri funcUri, ISparqlExpression expr)
Parameters
Type Name Description
System.Uri funcUri Function URI.
ISparqlExpression expr Argument Expression.

Properties

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Arguments

Gets the Arguments of the Expression.
Declaration
public IEnumerable<ISparqlExpression> Arguments { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<ISparqlExpression>
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CanParallelise

Gets whether an expression can safely be evaluated in parallel.
Declaration
public virtual bool CanParallelise { get; }
Property Value
Type Description
System.Boolean
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Functor

Gets the Function URI of the Expression.
Declaration
public string Functor { get; }
Property Value
Type Description
System.String
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Type

Gets the Expression Type.
Declaration
public SparqlExpressionType Type { get; }
Property Value
Type Description
SparqlExpressionType
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Variables

Gets the Variables used in the Function.
Declaration
public IEnumerable<string> Variables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.String>

Methods

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Evaluate(SparqlEvaluationContext, Int32)

Gives null as the Value since dotNetRDF does not know how to evaluate Unknown Functions.
Declaration
public IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
Parameters
Type Name Description
SparqlEvaluationContext context Evaluation Context.
System.Int32 bindingID Binding ID.
Returns
Type Description
IValuedNode
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ToString()

Gets the String representation of the Expression.
Declaration
public override string ToString()
Returns
Type Description
System.String
Overrides
System.Object.ToString()
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Transform(IExpressionTransformer)

Transforms the Expression using the given Transformer.
Declaration
public ISparqlExpression Transform(IExpressionTransformer transformer)
Parameters
Type Name Description
IExpressionTransformer transformer Expression Transformer.
Returns
Type Description
ISparqlExpression

Implements

Extension Methods