Class ExistsFunction

Represents an EXIST/NOT EXISTS clause used as a Function in an Expression.

Inheritance
System.Object
ExistsFunction
Implements
Inherited Members
object.Equals(object)
object.Equals(object, object)
object.GetHashCode()
object.GetType()
object.MemberwiseClone()
object.ReferenceEquals(object, object)
Namespace: VDS.RDF.Query.Expressions.Functions.Sparql.Boolean
Assembly: dotNetRdf.dll
Syntax
public class ExistsFunction : ISparqlExpression

Constructors

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ExistsFunction(GraphPattern, bool)

Creates a new EXISTS/NOT EXISTS function.

Declaration
public ExistsFunction(GraphPattern pattern, bool mustExist)
Parameters
Type Name Description
GraphPattern pattern

Graph Pattern.
System.Boolean mustExist

Whether this is an EXIST.

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<T><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 Functor of the Expression.

Declaration
public string Functor { get; }
Property Value
Type Description
string
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MustExist

Declaration
public bool MustExist { get; }
Property Value
Type Description
System.Boolean
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Pattern

Declaration
public GraphPattern Pattern { get; }
Property Value
Type Description
GraphPattern
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Type

Gets the Type of the Expression.

Declaration
public SparqlExpressionType Type { get; }
Property Value
Type Description
SparqlExpressionType
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Variables

Gets the Variables used in this Expression.

Declaration
public IEnumerable<string> Variables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<T><string>

Methods

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Accept<T>(ISparqlExpressionVisitor<T>)

Declaration
public T Accept<T>(ISparqlExpressionVisitor<T> visitor)
Parameters
Type Name Description
ISparqlExpressionVisitor<T> visitor
Returns
Type Description
T
Type Parameters
Name Description
T
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Accept<TResult, TContext, TBinding>(ISparqlExpressionProcessor<TResult, TContext, TBinding>, TContext, TBinding)

Declaration
public TResult Accept<TResult, TContext, TBinding>(ISparqlExpressionProcessor<TResult, TContext, TBinding> processor, TContext context, TBinding binding)
Parameters
Type Name Description
ISparqlExpressionProcessor<TResult, TContext, TBinding> processor
TContext context
TBinding binding
Returns
Type Description
TResult
Type Parameters
Name Description
TResult
TContext
TBinding
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ToString()

Gets the String representation of the Expression.

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