Class NullMultiset

Represents a Multiset when there are no possible Solutions.
Inheritance
System.Object
BaseMultiset
NullMultiset
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.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
System.Boolean
Overrides
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Item[Int32]

Gets the Set with the given ID.
Declaration
public override ISet this[int index] { get; }
Parameters
Type Name Description
System.Int32 index Set ID.
Property Value
Type Description
ISet
Overrides
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
System.Collections.Generic.IEnumerable<System.Int32>
Overrides
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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
System.Collections.Generic.IEnumerable<ISet>
Overrides
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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
System.Collections.Generic.IEnumerable<System.String>
Overrides

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
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
System.String variable Variable.
Overrides
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
System.String var Variable.
INode n Value.
Returns
Type Description
System.Boolean
Overrides
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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
System.String var Variable.
Returns
Type Description
System.Boolean
Overrides
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ExistsJoin(BaseMultiset, Boolean)

Exists Joins another Multiset to this Null Mutliset.
Declaration
public override BaseMultiset ExistsJoin(BaseMultiset other, bool mustExist)
Parameters
Type Name Description
BaseMultiset other Other Multiset.
System.Boolean 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
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IsDisjointWith(BaseMultiset)

Returns true since the Null Multiset is disjoint with all Multisets.
Declaration
public override bool IsDisjointWith(BaseMultiset other)
Parameters
Type Name Description
BaseMultiset other Other Multiset.
Returns
Type Description
System.Boolean
Overrides
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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
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LeftJoin(BaseMultiset, ISparqlExpression)

Left Joins another Multiset to this Null Mutliset.
Declaration
public override BaseMultiset LeftJoin(BaseMultiset other, ISparqlExpression expr)
Parameters
Type Name Description
BaseMultiset other Other Multiset.
ISparqlExpression expr Expression the join is predicate upon.
Returns
Type Description
BaseMultiset Results in this Null Multiset since Null joined to anything is Null.
Overrides
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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
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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
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Remove(Int32)

Removes a Set from a Multiset.
Declaration
public override void Remove(int id)
Parameters
Type Name Description
System.Int32 id Set ID.
Overrides
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
System.Collections.Generic.IEnumerable<System.String> variables Variable Ordering.
Overrides
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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

Extension Methods