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LazyUnion Class

Represents a Union.
Inheritance Hierarchy
SystemObject
  VDS.RDF.Query.AlgebraLazyUnion

Namespace:  VDS.RDF.Query.Algebra
Assembly:  dotNetRDF (in dotNetRDF.dll) Version:
Syntax
public class LazyUnion : IUnion, IAbstractJoin, 
	ISparqlAlgebra

The LazyUnion type exposes the following members.

Constructors
  NameDescription
Public methodLazyUnion(ISparqlAlgebra, ISparqlAlgebra)
Creates a new Lazy Union.
Public methodLazyUnion(ISparqlAlgebra, ISparqlAlgebra, Int32)
Creates a new Lazy Union.
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Properties
  NameDescription
Public propertyFixedVariables
Gets the enumeration of fixed variables in the algebra i.e. variables that are guaranteed to have a bound value.
Public propertyFloatingVariables
Gets the enumeration of floating variables in the algebra i.e. variables that are not guaranteed to have a bound value.
Public propertyLhs
Gets the LHS of the Join.
Public propertyRhs
Gets the RHS of the Join.
Public propertyVariables
Gets the Variables used in the Algebra.
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Methods
  NameDescription
Public methodEquals
Determines whether the specified object is equal to the current object.
(Inherited from Object.)
Public methodEvaluate
Evaluates the Lazy Union.
Protected methodFinalize
Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.
(Inherited from Object.)
Public methodGetHashCode
Serves as the default hash function.
(Inherited from Object.)
Public methodGetType
Gets the Type of the current instance.
(Inherited from Object.)
Protected methodMemberwiseClone
Creates a shallow copy of the current Object.
(Inherited from Object.)
Public methodToGraphPattern
Converts the Union back to Graph Patterns.
Public methodToQuery
Converts the Algebra back to a SPARQL Query.
Public methodToString
Gets the String representation of the Algebra.
(Overrides ObjectToString.)
Public methodTransform
Transforms both sides of the Join using the given Optimiser.
Public methodTransformLhs
Transforms the LHS of the Join using the given Optimiser.
Public methodTransformRhs
Transforms the RHS of the Join using the given Optimiser.
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Remarks

A Lazy Union differs from a standard Union in that if it finds sufficient solutions on the LHS it has no need to evaluate the RHS.

See Also