Class PatternItem

Class for representing Node Patterns in Sparql Queries.

Inheritance

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

_context

Binding Context for Pattern Item.

Declaration

protected SparqlResultBinder _context

Field Value

Type	Description
SparqlResultBinder

Properties

BindingContext

Sets the Binding Context for the Pattern Item.

Declaration

public SparqlResultBinder BindingContext { set; }

Property Value

Type	Description
SparqlResultBinder

IsFixed

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

Declaration

public abstract bool IsFixed { get; }

Property Value

Type	Description
bool

Repeated

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

Declaration

public virtual bool Repeated { get; set; }

Property Value

Type	Description
bool

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
bool

Variables

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

Declaration

public virtual IEnumerable<string> Variables { get; }

Property Value

Type	Description
IEnumerable<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

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
bool

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

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.

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

ToString()

Gets the String representation of the Pattern.

Declaration

public override abstract string ToString()

Returns

Type	Description
string

Overrides

object.ToString()

Extension Methods

Extensions.ToSafeString(object)

Extensions.AsEnumerable<T>(T)