Class GroupBy

Represents a Grouping.

Inheritance
System.Object
GroupBy
Implements
Inherited Members
object.Equals(object)
object.Equals(object, object)
object.GetHashCode()
object.GetType()
object.MemberwiseClone()
object.ReferenceEquals(object, object)
Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRdf.dll
Syntax
public class GroupBy : IUnaryOperator, ISparqlAlgebra, IVisitable, IProcessable

Constructors

| Improve this Doc View Source

GroupBy(ISparqlAlgebra, ISparqlGroupBy, IEnumerable<SparqlVariable>)

Creates a new Group By.

Declaration
public GroupBy(ISparqlAlgebra pattern, ISparqlGroupBy grouping, IEnumerable<SparqlVariable> aggregates)
Parameters
Type Name Description
ISparqlAlgebra pattern

Pattern.
ISparqlGroupBy grouping

Grouping to use.
System.Collections.Generic.IEnumerable<T><SparqlVariable> aggregates

Aggregates to calculate.

Properties

| Improve this Doc View Source

Aggregates

Gets the Aggregates that will be applied.

Declaration
public IEnumerable<SparqlVariable> Aggregates { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<T><SparqlVariable>
| Improve this Doc View Source

FixedVariables

Gets the enumeration of fixed variables in the algebra i.e. variables that are guaranteed to have a bound value.

Declaration
public IEnumerable<string> FixedVariables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<T><string>
| Improve this Doc View Source

FloatingVariables

Gets the enumeration of floating variables in the algebra i.e. variables that are not guaranteed to have a bound value.

Declaration
public IEnumerable<string> FloatingVariables { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<T><string>
| Improve this Doc View Source

Grouping

Gets the Grouping that is used.

Declaration
public ISparqlGroupBy Grouping { get; }
Property Value
Type Description
ISparqlGroupBy
Remarks

If the Query supplied in the SparqlEvaluationContext is non-null and has a GROUP BY clause then that is applied rather than the clause with which the GroupBy algebra is instantiated.

| Improve this Doc View Source

InnerAlgebra

Gets the Inner Algebra.

Declaration
public ISparqlAlgebra InnerAlgebra { get; }
Property Value
Type Description
ISparqlAlgebra
| Improve this Doc View Source

Variables

Gets the Variables used in the Algebra.

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

Methods

| Improve this Doc View Source

Accept<T>(ISparqlAlgebraVisitor<T>)

Declaration
public T Accept<T>(ISparqlAlgebraVisitor<T> visitor)
Parameters
Type Name Description
ISparqlAlgebraVisitor<T> visitor
Returns
Type Description
T
Type Parameters
Name Description
T
| Improve this Doc View Source

Accept<TResult, TContext>(ISparqlQueryAlgebraProcessor<TResult, TContext>, TContext)

Declaration
public 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
| Improve this Doc View Source

ToGraphPattern()

Throws an exception since GroupBy() cannot be converted to a Graph Pattern.

Declaration
public GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
Exceptions
Type Condition
System.NotSupportedException

Thrown since GroupBy() cannot be converted to a GraphPattern.
| Improve this Doc View Source

ToQuery()

Converts the Algebra back to a SPARQL Query.

Declaration
public SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
| Improve this Doc View Source

ToString()

Gets the String representation of the.

Declaration
public override string ToString()
Returns
Type Description
string
Overrides
object.ToString()
| Improve this Doc View Source

Transform(IAlgebraOptimiser)

Transforms the Inner Algebra using the given Optimiser.

Declaration
public ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser

Optimiser.
Returns
Type Description
ISparqlAlgebra

Implements

Extension Methods