Class NullMultiset

Represents a Multiset when there are no possible Solutions.

Inheritance

object

BaseMultiset

NullMultiset

Inherited Members

BaseMultiset._orderedIDs

BaseMultiset.VirtualCount

BaseMultiset.UsePLinqEvaluation

BaseMultiset.Merge(BaseMultiset)

BaseMultiset.Sort(IComparer<ISet>)

BaseMultiset.Count

BaseMultiset.Trim()

BaseMultiset.Trim(string)

BaseMultiset.ToString()

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 NullMultiset : BaseMultiset

Properties

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IsEmpty

Returns true since the Null Multiset is always empty.

Declaration

public override bool IsEmpty { get; }

Property Value

Type	Description
bool

Overrides

BaseMultiset.IsEmpty

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this[int]

Gets the Set with the given ID.

Declaration

public override ISet this[int index] { get; }

Parameters

Type	Name	Description
int	index	Set ID.

Property Value

Type	Description
ISet

Overrides

BaseMultiset.this[int]

Exceptions

Type	Condition
RdfQueryException	Thrown since the Null Multiset contains no Sets.

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SetIDs

Returns an empty enumerable as the Null Multiset contains no Sets.

Declaration

public override IEnumerable<int> SetIDs { get; }

Property Value

Type	Description
IEnumerable<int>

Overrides

BaseMultiset.SetIDs

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Sets

Returns an empty enumerable as the Null Multiset contains no Sets.

Declaration

public override IEnumerable<ISet> Sets { get; }

Property Value

Type	Description
IEnumerable<ISet>

Overrides

BaseMultiset.Sets

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Variables

Returns an empty enumerable as the Null Multiset contains no Variables.

Declaration

public override IEnumerable<string> Variables { get; }

Property Value

Type	Description
IEnumerable<string>

Overrides

BaseMultiset.Variables

Methods

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Add(ISet)

Adds a Set to this Multiset.

Declaration

public override void Add(ISet s)

Parameters

Type	Name	Description
ISet	s	Set.

Overrides

BaseMultiset.Add(ISet)

Exceptions

Type	Condition
RdfQueryException	Thrown since the operation is invalid on a Null Multiset.

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AddVariable(string)

Adds a Variable to this Multiset.

Declaration

public override void AddVariable(string variable)

Parameters

Type	Name	Description
string	variable	Variable.

Overrides

BaseMultiset.AddVariable(string)

Exceptions

Type	Condition
RdfQueryException	Thrown since the operation is invalid on a Null Multiset.

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ContainsValue(string, INode)

Returns false since the Null Multiset contains no values.

Declaration

public override bool ContainsValue(string var, INode n)

Parameters

Type	Name	Description
string	var	Variable.
INode	n	Value.

Returns

Type	Description
bool

Overrides

BaseMultiset.ContainsValue(string, INode)

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ContainsVariable(string)

Returns false since the Null Multiset contains no variables.

Declaration

public override bool ContainsVariable(string var)

Parameters

Type	Name	Description
string	var	Variable.

Returns

Type	Description
bool

Overrides

BaseMultiset.ContainsVariable(string)

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ContainsVariables(IEnumerable<string>)

Returns false since the Null Multiset contains no variables.

Declaration

public override bool ContainsVariables(IEnumerable<string> vars)

Parameters

Type	Name	Description
IEnumerable<string>	vars	Variables.

Returns

Type	Description
bool

Overrides

BaseMultiset.ContainsVariables(IEnumerable<string>)

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ExistsJoin(BaseMultiset, bool)

Exists Joins another Multiset to this Null Multiset.

Declaration

public override BaseMultiset ExistsJoin(BaseMultiset other, bool mustExist)

Parameters

Type	Name	Description
BaseMultiset	other	Other Multiset.
bool	mustExist	Whether joinable solutions must exist in the other Multiset for joins to be made.

Returns

Type	Description
BaseMultiset	Results in this Null Multiset since Null joined to anything is Null.

Overrides

BaseMultiset.ExistsJoin(BaseMultiset, bool)

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IsDisjointWith(BaseMultiset)

Returns true since the Null Multiset is disjoint with any Multiset.

Declaration

public override bool IsDisjointWith(BaseMultiset other)

Parameters

Type	Name	Description
BaseMultiset	other	Other Multiset.

Returns

Type	Description
bool

Overrides

BaseMultiset.IsDisjointWith(BaseMultiset)

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Join(BaseMultiset)

Joins another Multiset to this Null Mutliset.

Declaration

public override BaseMultiset Join(BaseMultiset other)

Parameters

Type	Name	Description
BaseMultiset	other	Other Multiset.

Returns

Type	Description
BaseMultiset	Results in this Null Multiset since Null joined to anything is Null.

Overrides

BaseMultiset.Join(BaseMultiset)

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LeftJoin(BaseMultiset, ISparqlExpression, SparqlEvaluationContext, ISparqlExpressionProcessor<IValuedNode, SparqlEvaluationContext, int>)

Left Joins another Multiset to this Null Multiset.

Declaration

public override BaseMultiset LeftJoin(BaseMultiset other, ISparqlExpression expr, SparqlEvaluationContext baseContext, ISparqlExpressionProcessor<IValuedNode, SparqlEvaluationContext, int> expressionProcessor)

Parameters

Type	Name	Description
BaseMultiset	other	Other Multiset.
ISparqlExpression	expr	Expression the join is predicate upon.
SparqlEvaluationContext	baseContext	The parent context for the evaluation of the join.
ISparqlExpressionProcessor<IValuedNode, SparqlEvaluationContext, int>	expressionProcessor	The processor to use to evaluate `expr`.

Returns

Type	Description
BaseMultiset	Results in this Null Multiset since Null joined to anything is Null.

Overrides

BaseMultiset.LeftJoin(BaseMultiset, ISparqlExpression, SparqlEvaluationContext, ISparqlExpressionProcessor<IValuedNode, SparqlEvaluationContext, int>)

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MinusJoin(BaseMultiset)

Minus Joins this Multiset to another Multiset.

Declaration

public override BaseMultiset MinusJoin(BaseMultiset other)

Parameters

Type	Name	Description
BaseMultiset	other	Other Multiset.

Returns

Type	Description
BaseMultiset

Overrides

BaseMultiset.MinusJoin(BaseMultiset)

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Product(BaseMultiset)

Computes the Product of this Multiset and another Multiset.

Declaration

public override BaseMultiset Product(BaseMultiset other)

Parameters

Type	Name	Description
BaseMultiset	other	Other Multiset.

Returns

Type	Description
BaseMultiset	Results in the Other Multiset since for Product we consider this Multiset to contain a single empty Set.

Overrides

BaseMultiset.Product(BaseMultiset)

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Remove(int)

Removes a Set from a Multiset.

Declaration

public override void Remove(int id)

Parameters

Type	Name	Description
int	id	Set ID.

Overrides

BaseMultiset.Remove(int)

Exceptions

Type	Condition
RdfQueryException	Thrown since the operation is invalid on a Null Multiset.

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SetVariableOrder(IEnumerable<string>)

Sets the variable ordering for the multiset.

Declaration

public override void SetVariableOrder(IEnumerable<string> variables)

Parameters

Type	Name	Description
IEnumerable<string>	variables	Variable Ordering.

Overrides

BaseMultiset.SetVariableOrder(IEnumerable<string>)

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Union(BaseMultiset)

Unions this Multiset with another Multiset.

Declaration

public override BaseMultiset Union(BaseMultiset other)

Parameters

Type	Name	Description
BaseMultiset	other	Other Multiset.

Returns

Type	Description
BaseMultiset	Results in the Other Multiset as this is an empty Multiset.

Overrides

BaseMultiset.Union(BaseMultiset)

Extension Methods

Extensions.ToSafeString(object)

AlgebraExtensions.ProductWithTimeout(BaseMultiset, BaseMultiset, long)

Extensions.AsEnumerable<T>(T)