Class Slice

Represents the Slice Operation in the SPARQL Algebra.

Inheritance

object

Slice

Implements

IUnaryOperator

ISparqlAlgebra

IVisitable

IProcessable

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

Namespace: VDS.RDF.Query.Algebra

Assembly: dotNetRdf.dll

Syntax

public class Slice : IUnaryOperator, ISparqlAlgebra, IVisitable, IProcessable

Constructors

Slice(ISparqlAlgebra)

Creates a new Slice modifier which will detect LIMIT and OFFSET from the query.

Declaration

public Slice(ISparqlAlgebra pattern)

Parameters

Type	Name	Description
ISparqlAlgebra	pattern	Pattern.

Slice(ISparqlAlgebra, int, int)

Creates a new Slice modifier which uses a specific LIMIT and OFFSET.

Declaration

public Slice(ISparqlAlgebra pattern, int limit, int offset)

Parameters

Type	Name	Description
ISparqlAlgebra	pattern	Pattern.
int	limit	Limit.
int	offset	Offset.

Properties

DetectFromQuery

Gets whether the Algebra will detect the Limit and Offset to use from the provided query.

Declaration

public bool DetectFromQuery { get; }

Property Value

Type	Description
bool

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>

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>

InnerAlgebra

Gets the Inner Algebra.

Declaration

public ISparqlAlgebra InnerAlgebra { get; }

Property Value

Type	Description
ISparqlAlgebra

Limit

Gets the Limit in use (-1 indicates no Limit).

Declaration

public int Limit { get; }

Property Value

Type	Description
int

Offset

Gets the Offset in use (0 indicates no Offset).

Declaration

public int Offset { get; }

Property Value

Type	Description
int

Variables

Gets the Variables used in the Algebra.

Declaration

public IEnumerable<string> Variables { get; }

Property Value

Type	Description
IEnumerable<string>

Methods

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.

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.

ToGraphPattern()

Throws an exception since a Slice() cannot be converted back to a Graph Pattern.

Declaration

public GraphPattern ToGraphPattern()

Returns

Type	Description
GraphPattern

Exceptions

Type	Condition
NotSupportedException	Thrown since a Slice() cannot be converted to a Graph Pattern.

ToQuery()

Converts the Algebra back to a SPARQL Query.

Declaration

public SparqlQuery ToQuery()

Returns

Type	Description
SparqlQuery

ToString()

Gets the String representation of the Algebra.

Declaration

public override string ToString()

Returns

Type	Description
string

Overrides

object.ToString()

Transform(IAlgebraOptimiser)

Transforms the Inner Algebra using the given Optimiser.

Declaration

public ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)

Parameters

Type	Name	Description
IAlgebraOptimiser	optimiser	Optimiser.

Returns

Type	Description
ISparqlAlgebra

Implements

IUnaryOperator

ISparqlAlgebra

IVisitable

IProcessable

Extension Methods

Extensions.ToSafeString(object)

Extensions.AsEnumerable<T>(T)