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Class AskBgp

Represents a BGP which is a set of Triple Patterns.

Inheritance
System.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

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AskBgp(IEnumerable<ITriplePattern>)

Creates a Streamed BGP containing a set of Triple Patterns.

Declaration
public AskBgp(IEnumerable<ITriplePattern> ps)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T><ITriplePattern> ps

Triple Patterns.

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.

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AskBgp(ITriplePattern)

Creates a Streamed BGP containing a single Triple Pattern.

Declaration
public AskBgp(ITriplePattern p)
Parameters
Type Name Description
ITriplePattern p

Triple Pattern.

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.

Properties

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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
System.Collections.Generic.IEnumerable<T><string>
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.

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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
System.Collections.Generic.IEnumerable<T><string>
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.

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IsEmpty

Gets whether the BGP is the empty BGP.

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

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PatternCount

Gets the number of Triple Patterns in the BGP.

Declaration
public int PatternCount { get; }
Property Value
Type Description
int
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.

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TriplePatterns

Gets the Triple Patterns in the BGP.

Declaration
public IReadOnlyList<ITriplePattern> TriplePatterns { get; }
Property Value
Type Description
System.Collections.Generic.IReadOnlyList<T><ITriplePattern>
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.

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Variables

Gets the Variables used in the Algebra.

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

Methods

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Accept<T>(ISparqlAlgebraVisitor<T>)

Declaration
public T Accept<T>(ISparqlAlgebraVisitor<T> visitor)
Parameters
Type Name Description
ISparqlAlgebraVisitor<T> visitor
Returns
Type Description
T
Type Parameters
Name Description
T
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.

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Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)

Declaration
public TResult Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext> processor, TContext context)
Parameters
Type Name Description
ISparqlQueryAlgebraProcessor<TResult, TContext> processor
TContext context
Returns
Type Description
TResult
Type Parameters
Name Description
TResult
TContext
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.

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ToGraphPattern()

Converts the BGP back to a Graph Pattern.

Declaration
public GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
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.

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ToQuery()

Converts the Algebra back to a SPARQL Query.

Declaration
public SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
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.

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ToString()

Gets the String representation of the Algebra.

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

Implements

IBgp
ITerminalOperator
ISparqlAlgebra
IVisitable
IProcessable

Extension Methods

Extensions.ToSafeString(object)
Extensions.AsEnumerable<T>(T)
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In This Article
  • Constructors
    • AskBgp(IEnumerable<ITriplePattern>)
    • AskBgp(ITriplePattern)
  • Properties
    • FixedVariables
    • FloatingVariables
    • IsEmpty
    • PatternCount
    • TriplePatterns
    • Variables
  • Methods
    • Accept<T>(ISparqlAlgebraVisitor<T>)
    • Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)
    • ToGraphPattern()
    • ToQuery()
    • ToString()
  • Implements
  • Extension Methods
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