Class AskBgp

Represents a BGP which is a set of Triple Patterns.

Inheritance

object

AskBgp

Implements

IBgp

ITerminalOperator

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 AskBgp : IBgp, ITerminalOperator, ISparqlAlgebra, IVisitable, IProcessable

Remarks

An Ask BGP differs from a BGP in that rather than evaluating each Triple Pattern in turn it evaluates across all Triple Patterns. This is used for ASK queries where we are only concerned with whether a BGP matches and not in the specific solutions.

An Ask BGP can only contain concrete Triple Patterns and/or FILTERs and not any of the other specialised Triple Pattern classes.

Constructors

AskBgp(IEnumerable<ITriplePattern>)

Creates a Streamed BGP containing a set of Triple Patterns.

Declaration

public AskBgp(IEnumerable<ITriplePattern> ps)

Parameters

Type	Name	Description
IEnumerable<ITriplePattern>	ps	Triple Patterns.

AskBgp(ITriplePattern)

Creates a Streamed BGP containing a single Triple Pattern.

Declaration

public AskBgp(ITriplePattern p)

Parameters

Type	Name	Description
ITriplePattern	p	Triple Pattern.

Properties

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>

IsEmpty

Gets whether the BGP is the empty BGP.

Declaration

public bool IsEmpty { get; }

Property Value

Type	Description
bool

PatternCount

Gets the number of Triple Patterns in the BGP.

Declaration

public int PatternCount { get; }

Property Value

Type	Description
int

TriplePatterns

Gets the Triple Patterns in the BGP.

Declaration

public IReadOnlyList<ITriplePattern> TriplePatterns { get; }

Property Value

Type	Description
IReadOnlyList<ITriplePattern>

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()

Converts the BGP back to a Graph Pattern.

Declaration

public GraphPattern ToGraphPattern()

Returns

Type	Description
GraphPattern

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()

Implements

IBgp

ITerminalOperator

ISparqlAlgebra

IVisitable

IProcessable

Extension Methods

Extensions.ToSafeString(object)

Extensions.AsEnumerable<T>(T)