Class PatternItem

Class for representing Node Patterns in Sparql Queries.

Inheritance
System.Object
PatternItem
BlankNodePattern
FixedBlankNodePattern
NodeMatchPattern
QuotedTriplePattern
VariablePattern
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 abstract class PatternItem

Fields

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_context

Binding Context for Pattern Item.

Declaration
protected SparqlResultBinder _context
Field Value
Type Description
SparqlResultBinder

Properties

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BindingContext

Sets the Binding Context for the Pattern Item.

Declaration
public SparqlResultBinder BindingContext { set; }
Property Value
Type Description
SparqlResultBinder
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IsFixed

Return true if this pattern item contains no variables, false otherwise.

Declaration
public abstract bool IsFixed { get; }
Property Value
Type Description
System.Boolean
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Repeated

Gets/Sets whether the Variable is repeated in the Pattern.

Declaration
public virtual bool Repeated { get; set; }
Property Value
Type Description
System.Boolean
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RigorousEvaluation

Gets/Sets whether rigorous evaluation is used, note that this setting may be overridden by the RigorousEvaluation option passed to the query processor when it is initialized.

Declaration
public bool RigorousEvaluation { get; set; }
Property Value
Type Description
System.Boolean
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Variables

Gets an enumeration of the names of the variables of this pattern.

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

If this item is a Variable Pattern, the enumeration will contain a single item. If this item is a QuotedTriplePattern, the enumeration may contain zero or more items. For other pattern items the enumeration will be empty.

Methods

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Accepts(IPatternEvaluationContext, INode, ISet)

Checks whether the Pattern Item accepts the given Node in the given Context.

Declaration
public abstract bool Accepts(IPatternEvaluationContext context, INode obj, ISet set)
Parameters
Type Name Description
IPatternEvaluationContext context

Evaluation Context.
INode obj

Node to test.
ISet set
Returns
Type Description
System.Boolean
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AddBindings(INode, ISet)

Returns the variable bindings created when this pattern item accepts the given node to the specified set.

Declaration
public abstract void AddBindings(INode forNode, ISet toSet)
Parameters
Type Name Description
INode forNode
ISet toSet
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Bind(ISet)

Returns a node created by applying the variable bindings in the input set to this pattern item.

Declaration
public abstract INode Bind(ISet variableBindings)
Parameters
Type Name Description
ISet variableBindings
Returns
Type Description
INode

A node binding for the pattern item or null if no binding is possible with the provide set.
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Construct(ConstructContext)

Constructs a Node based on this Pattern for the given Set.

Declaration
public abstract INode Construct(ConstructContext context)
Parameters
Type Name Description
ConstructContext context

Construct Context.
Returns
Type Description
INode
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ToString()

Gets the String representation of the Pattern.

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

Extension Methods