Class Bgp

Represents a BGP which is a set of Triple Patterns.

Inheritance
object
Bgp
LazyBgp
Implements
Inherited Members
Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRdf.dll
Syntax
public class Bgp : IBgp, ITerminalOperator, ISparqlAlgebra, IVisitable, IProcessable

Constructors

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Bgp()

Creates a new empty BGP.

Declaration
public Bgp()
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Bgp(IEnumerable<ITriplePattern>)

Creates a BGP containing a set of Triple Patterns.

Declaration
public Bgp(IEnumerable<ITriplePattern> ps)
Parameters
Type Name Description
IEnumerable<ITriplePattern> ps

Triple Patterns.
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Bgp(ITriplePattern)

Creates a BGP containing a single Triple Pattern.

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

Triple Pattern.

Fields

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_triplePatterns

The ordered list of triple patterns that are contained in this BGP.

Declaration
protected readonly List<ITriplePattern> _triplePatterns
Field Value
Type Description
List<ITriplePattern>

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
IEnumerable<string>
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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
IEnumerable<string>
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IsEmpty

Gets whether the BGP is the empty BGP.

Declaration
public bool IsEmpty { get; }
Property Value
Type Description
bool
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PatternCount

Gets the number of Triple Patterns in the BGP.

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

Gets the Triple Patterns in the BGP.

Declaration
public IReadOnlyList<ITriplePattern> TriplePatterns { get; }
Property Value
Type Description
IReadOnlyList<ITriplePattern>
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Variables

Gets the Variables used in the Algebra.

Declaration
public IEnumerable<string> Variables { get; }
Property Value
Type Description
IEnumerable<string>

Methods

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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.
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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.
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ToGraphPattern()

Converts the BGP to a Graph Pattern.

Declaration
public virtual GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
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ToQuery()

Converts the Algebra back to a SPARQL Query.

Declaration
public virtual SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
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ToString()

Returns the String representation of the BGP.

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

Implements

Extension Methods