Class BaseTriplePattern

Base class for representing all types of Triple Patterns in SPARQL queries.
Inheritance
System.Object
BaseTriplePattern
BindPattern
FilterPattern
LetPattern
PropertyFunctionPattern
PropertyPathPattern
SubQueryPattern
TriplePattern
Implements
System.IComparable<ITriplePattern>
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: VDS.RDF.Query.Patterns
Assembly: dotNetRDF.dll
Syntax
public abstract class BaseTriplePattern : ITriplePattern, IComparable<ITriplePattern>

Fields

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_vars

Stores the list of variables that are used in the Pattern.
Declaration
protected List<string> _vars
Field Value
Type Description
System.Collections.Generic.List<System.String>

Properties

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FixedVariables

Gets the enumeration of fixed variables in the pattern i.e. variables that are guaranteed to have a bound value.
Declaration
public abstract IEnumerable<string> FixedVariables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.String>
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FloatingVariables

Gets the enumeration of floating variables in the pattern i.e. variables that are not guaranteed to have a bound value.
Declaration
public abstract IEnumerable<string> FloatingVariables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.String>
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HasNoBlankVariables

Gets whether the Pattern has no blank variables.
Declaration
public abstract bool HasNoBlankVariables { get; }
Property Value
Type Description
System.Boolean
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IsAcceptAll

Returns whether the Triple Pattern is an accept all.
Declaration
public abstract bool IsAcceptAll { get; }
Property Value
Type Description
System.Boolean
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PatternType

Gets the Triple Pattern Type.
Declaration
public abstract TriplePatternType PatternType { get; }
Property Value
Type Description
TriplePatternType
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UsesDefaultDataset

Gets whether a Triple Pattern is Thread Safe when evaluated.
Declaration
public virtual bool UsesDefaultDataset { get; }
Property Value
Type Description
System.Boolean
Remarks
Almost all Triple Patterns are Thread Safe unless they are subquery patterns which themselves are not thread safe.
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Variables

Gets the List of Variables used in the Pattern.
Declaration
public List<string> Variables { get; }
Property Value
Type Description
System.Collections.Generic.List<System.String>
Remarks
These are sorted in alphabetical order.

Methods

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CompareTo(ITriplePattern)

Compares a Triple Pattern to another Triple Pattern.
Declaration
public virtual int CompareTo(ITriplePattern other)
Parameters
Type Name Description
ITriplePattern other Other Triple Pattern.
Returns
Type Description
System.Int32
Remarks

The aim of this function is to sort Triple Patterns into what is hopefully an optimal order such that during execution the query space is restricted as early as possible.

The basic rules of this are as follows:.

  1. Patterns with fewer variables should be executed first
  2. Patterns using the same variables should be executed in sequence
  3. Patterns using indexes which are considered more useful should be executed first

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Evaluate(SparqlEvaluationContext)

Evaluates the Triple Pattern in the given Evaluation Context.
Declaration
public abstract void Evaluate(SparqlEvaluationContext context)
Parameters
Type Name Description
SparqlEvaluationContext context Evaluation Context.
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ToString()

Gets the String representation of the Pattern.
Declaration
public abstract override string ToString()
Returns
Type Description
System.String
Overrides
System.Object.ToString()

Implements

System.IComparable<T>

Extension Methods