Class LetPattern

Class for representing LET Patterns in SPARQL Queries.

Inheritance
System.Object
BaseTriplePattern
LetPattern
Implements
System.IComparable<T><LetPattern>
System.IComparable<T><ITriplePattern>
System.IComparable<T><IAssignmentPattern>
Inherited Members
object.Equals(object)
object.Equals(object, object)
object.GetHashCode()
object.GetType()
object.MemberwiseClone()
object.ReferenceEquals(object, object)
Namespace: VDS.RDF.Query.Patterns
Assembly: dotNetRdf.dll
Syntax
public class LetPattern : BaseTriplePattern, IComparable<LetPattern>, IAssignmentPattern, ITriplePattern, IComparable<ITriplePattern>, IProcessable, IVisitable, IComparable<IAssignmentPattern>

Constructors

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LetPattern(string, ISparqlExpression)

Creates a new LET Pattern.

Declaration
public LetPattern(string var, ISparqlExpression expr)
Parameters
Type Name Description
string var

Variable to assign to.
ISparqlExpression expr

Expression which generates a value which will be assigned to the variable.

Properties

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AssignExpression

Gets the Expression that is used to generate values to be assigned.

Declaration
public ISparqlExpression AssignExpression { get; }
Property Value
Type Description
ISparqlExpression
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FixedVariables

Returns an empty enumeration as any evaluation error will result in an unbound value so we can't guarantee any variables are bound.

Declaration
public override IEnumerable<string> FixedVariables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<T><string>
Overrides
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FloatingVariables

Returns the variable being assigned to as any evaluation error will result in an unbound value so we can't guarantee it is bound.

Declaration
public override IEnumerable<string> FloatingVariables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<T><string>
Overrides
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HasNoBlankVariables

Returns true as a LET can never contain Blank Nodes.

Declaration
public override bool HasNoBlankVariables { get; }
Property Value
Type Description
System.Boolean
Overrides
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IsAcceptAll

Returns that this is not an accept all since it is a LET assignment.

Declaration
public override bool IsAcceptAll { get; }
Property Value
Type Description
System.Boolean
Overrides
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PatternType

Gets the Pattern Type.

Declaration
public override TriplePatternType PatternType { get; }
Property Value
Type Description
TriplePatternType
Overrides
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UsesDefaultDataset

Gets whether the Pattern uses the Default Dataset.

Declaration
public override bool UsesDefaultDataset { get; }
Property Value
Type Description
System.Boolean
Overrides
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VariableName

Gets the Name of the Variable to which values will be assigned.

Declaration
public string VariableName { get; }
Property Value
Type Description
string

Methods

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Accept<T>(ISparqlAlgebraVisitor<T>)

Declaration
public override T Accept<T>(ISparqlAlgebraVisitor<T> visitor)
Parameters
Type Name Description
ISparqlAlgebraVisitor<T> visitor
Returns
Type Description
T
Type Parameters
Name Description
T
Overrides
VDS.RDF.Query.Patterns.BaseTriplePattern.Accept<T>(VDS.RDF.Query.ISparqlAlgebraVisitor<T>)
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Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)

Declaration
public override 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
Overrides
VDS.RDF.Query.Patterns.BaseTriplePattern.Accept<TResult, TContext>(VDS.RDF.Query.ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)
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CompareTo(IAssignmentPattern)

Compares this Let to another Let.

Declaration
public int CompareTo(IAssignmentPattern other)
Parameters
Type Name Description
IAssignmentPattern other

Let to compare to.
Returns
Type Description
int

Just calls the base compare method since that implements all the logic we need.
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CompareTo(LetPattern)

Compares this Let to another Let.

Declaration
public int CompareTo(LetPattern other)
Parameters
Type Name Description
LetPattern other

Let to compare to.
Returns
Type Description
int

Just calls the base compare method since that implements all the logic we need.
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ToString()

Gets the string representation of the LET assignment.

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

Implements

System.IComparable<T>
System.IComparable<T>
System.IComparable<T>

Extension Methods