Class ExistsFunction

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

Inheritance

object

ExistsFunction

Implements

ISparqlExpression

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

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.
bool	mustExist	Whether this is an EXIST.

Properties

Arguments

Gets the Arguments of the Expression.

Declaration

public IEnumerable<ISparqlExpression> Arguments { get; }

Property Value

Type	Description
IEnumerable<ISparqlExpression>

CanParallelise

Gets whether an expression can safely be evaluated in parallel.

Declaration

public virtual bool CanParallelise { get; }

Property Value

Type	Description
bool

Functor

Gets the Functor of the Expression.

Declaration

public string Functor { get; }

Property Value

Type	Description
string

MustExist

Get whether this is an EXIST (true) or NOT EXIST (false).

Declaration

public bool MustExist { get; }

Property Value

Type	Description
bool

Pattern

Get the pattern to test for (non-)existence.

Declaration

public GraphPattern Pattern { get; }

Property Value

Type	Description
GraphPattern

Type

Gets the Type of the Expression.

Declaration

public SparqlExpressionType Type { get; }

Property Value

Type	Description
SparqlExpressionType

Variables

Gets the Variables used in this Expression.

Declaration

public IEnumerable<string> Variables { get; }

Property Value

Type	Description
IEnumerable<string>

Methods

Accept<T>(ISparqlExpressionVisitor<T>)

Accept a ISparqlExpressionVisitor<T> by calling the appropriate method on its interface for this expression.

Declaration

public T Accept<T>(ISparqlExpressionVisitor<T> visitor)

Parameters

Type	Name	Description
ISparqlExpressionVisitor<T>	visitor	The visitor to be invoked.

Returns

Type	Description
T	The result of calling the method on the visitor.

Type Parameters

Name	Description
T	Type of result that the called method returns.

Accept<TResult, TContext, TBinding>(ISparqlExpressionProcessor<TResult, TContext, TBinding>, TContext, TBinding)

Accept a ISparqlExpressionProcessor<TResult, TContext, TBinding> by calling the appropriate method on its interface for this expression.

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	The processor to be invoked.
TContext	context	The context object to use for processing.
TBinding	binding	The binding to be processed.

Returns

Type	Description
TResult

Type Parameters

Name	Description
TResult	Type of result that the process method returns.
TContext	The type of the context parameter to the process method.
TBinding	The type of the binding parameter of the process method.

ToString()

Gets the String representation of the Expression.

Declaration

public override string ToString()

Returns

Type	Description
string

Overrides

object.ToString()

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

ISparqlExpression

Extension Methods

Extensions.ToSafeString(object)

Extensions.AsEnumerable<T>(T)