Abstract Class UML 2.3::Classifier

Description:

Classifier is defined to be a kind of templateable element so that a classifier can be parameterized. It is also defined to be a kind of parameterable element so that a classifier can be a formal template parameter.

Direct Superclasses: TemplateableElement, Type, Namespace, RedefinableElement

Direct Subclasses: StructuredClassifier, Signal, Interface, InformationItem, DataType, BehavioredClassifier, Association, Artifact

Class Precedence List: Classifier, TemplateableElement, Type, PackageableElement, ParameterableElement, Namespace, RedefinableElement, NamedElement, Element

Properties:

attribute : Property (0 *); -- source Classifier
collaborationUse : CollaborationUse (0 *); -- source Classifier
feature : Feature (0 *); -- source Classifier
general : Classifier (0 *); -- source Classifier
generalization : Generalization (0 *); -- source Classifier
inheritedMember : NamedElement (0 *); -- source Classifier
isAbstract : Boolean (1 1); -- source Classifier
isFinalSpecialization : Boolean (1 1); -- source Classifier
ownedTemplateSignature : RedefinableTemplateSignature (0 1); -- source Classifier
ownedUseCase : UseCase (0 *); -- source Classifier
powertypeExtent : GeneralizationSet (0 *); -- source Classifier
redefinedClassifier : Classifier (0 *); -- source Classifier
representation : CollaborationUse (0 1); -- source Classifier
substitution : Substitution (0 *); -- source Classifier
templateParameter : ClassifierTemplateParameter (0 1); -- source Classifier
useCase : UseCase (0 *); -- source Classifier
templateBinding : TemplateBinding (0 *); -- source TemplateableElement
package : Package (0 1); -- source Type
visibility : VisibilityKind (1 1); -- source PackageableElement
owningTemplateParameter : TemplateParameter (0 1); -- source ParameterableElement
elementImport : ElementImport (0 *); -- source Namespace
importedMember : PackageableElement (0 *); -- source Namespace
member : NamedElement (0 *); -- source Namespace
ownedMember : NamedElement (0 *); -- source Namespace
ownedRule : Constraint (0 *); -- source Namespace
packageImport : PackageImport (0 *); -- source Namespace
isLeaf : Boolean (1 1); -- source RedefinableElement
redefinedElement : RedefinableElement (0 *); -- source RedefinableElement
redefinitionContext : Classifier (0 *); -- source RedefinableElement
clientDependency : Dependency (0 *); -- source NamedElement
name : String (0 1); -- source NamedElement
nameExpression : StringExpression (0 1); -- source NamedElement
namespace : Namespace (0 1); -- source NamedElement
qualifiedName : String (0 1); -- source NamedElement
ownedComment : Comment (0 *); -- source Element
ownedElement : Element (0 *); -- source Element
owner : Element (0 1); -- source Element

Constraints:

Signature: specialize_type() : Boolean;
Description: A classifier may only specialize classifiers of a valid type.
Expression: self.parents()->forAll(c | self.maySpecializeType(c))

Signature: non_final_parents() : Boolean;
Description: The parents of a classifier must be non-final.
Expression: self.parents()->forAll(not isFinalSpecialization)

Signature: no_cycles_in_generalization() : Boolean;
Description: Generalization hierarchies must be directed and acyclical. A classifier can not be both a transitively general and transitively specific classifier of the same classifier.
Expression: not self.allParents()->includes(self)

Signature: maps_to_generalization_set() : Boolean;
Description: The Classifier that maps to a GeneralizationSet may neither be a specific nor a general Classifier in any of the Generalization relationships defined for that GeneralizationSet. In other words, a power type may not be an instance of itself nor may its instances also be its subclasses.
Expression: true

Signature: generalization_hierarchies() : Boolean;
Description: Generalization hierarchies must be directed and acyclical. A classifier can not be both a transitively general and transitively specific classifier of the same classifier.
Expression: not self.allParents()->includes(self)

Operations:

Signature: parents() : Classifier;
Description: The query parents() gives all of the immediate ancestors of a generalized Classifier.
The OCL used here is not normative.
Editor's notes: self.generalization is a Set, we want the general of each of its elements.
Expression: result = generalization->collect(general)
Original: result = generalization.general

Signature: maySpecializeType(c : Classifier; ) : Boolean;
Description: The query maySpecializeType() determines whether this classifier may have a generalization relationship to classifiers of the specified type. By default a classifier may specialize classifiers of the same or a more general type. It is intended to be redefined by classifiers that have different specialization constraints.
The OCL used here is not normative.
Editor's notes: oclType() not oclType. No such operator in OCL AFAIK. But I have one for this purpose.
Expression: result = self.oclIsKindOf(c.oclType())
Original: result = self.oclIsKindOf(c.oclType)

Signature: isTemplate() : Boolean;
Description: The query isTemplate() returns whether this templateable element is actually a template.
The OCL used here is not normative.
Editor's notes: Templateable not Templatable.
Expression: result = oclAsType(TemplateableElement).isTemplate() or general->exists(g | g.isTemplate())
Original: result = oclAsType(TemplatableElement).isTemplate() or general->exists(g | g.isTemplate())

Signature: hasVisibilityOf(n : NamedElement; ) : Boolean;
Description: The query hasVisibilityOf() determines whether a named element is visible in the classifier. By default all are visible. It is only called when the argument is something owned by a parent.
The OCL used here is not normative.
Editor's notes: I rewrote inheritedMember to not use inheritableMembers and hasVisibilityOf. These produce an non-progressing recursion (calling each other with no change in arguments).
Expression: Set {}
Original: result = if (self.inheritedMember->includes(n)) then (n.visibility <> #private) else true

Signature: inheritedMember.1() : NamedElement;
Description: The inheritedMember association is derived by inheriting the inheritable members of the parents.
The OCL used here is not normative.
Editor's notes: I rewrote inheritedMember to not use inheritableMembers and hasVisibilityOf. These produce an non-progressing recursion (calling each other with no change in arguments).
Expression: result = self.inheritedMemberAux()->asSet()
Original: result = self.inherit(self.parents()->collect(p | p.inheritableMembers(self))

Signature: inheritedMemberAux() : NamedElement;
Description: The inheritedMember association is derived by inheriting the inheritable members of the parents.
Editor's notes: This is a new function defined to correct the problem of non-progressing recursion of the normative inheritedMember.1
Expression: result = let directs = self.parents()->reject(x | x.visibility = #private) in if directs->isEmpty() then directs else directs->collect(x | x.inheritedMemberAux())->union(directs) endif

Signature: inheritableMembers(c : Classifier; ) : NamedElement;
Description: The query inheritableMembers() gives all of the members of a classifier that may be inherited in one of its descendants, subject to whatever visibility restrictions apply.
The OCL used here is not normative.
Editor's notes: I rewrote inheritedMember to not use inheritableMembers and hasVisibilityOf. These produce an non-progressing recursion (calling each other with no change in arguments).
Expression: Set{}
Original: result = member->select(m | c.hasVisibilityOf(m))

Signature: inherit(inhs : NamedElement; ) : NamedElement;
Description: The query inherit() defines how to inherit a set of elements. Here the operation is defined to inherit them all. It is intended to be redefined in circumstances where inheritance is affected by redefinition.
Expression: result = inhs

Signature: general.1() : Classifier;
Description: The general classifiers are the classifiers referenced by the generalization relationships.
Expression: result = self.parents()

Signature: conformsTo(other : Classifier; ) : Boolean;
Description: The query conformsTo() gives true for a classifier that defines a type that conforms to another. This is used, for example, in the specification of signature conformance for operations.
Expression: result = (self=other) or (self.allParents()->includes(other))

Signature: allParents() : Classifier;
Description: The query allParents() gives all of the direct and indirect ancestors of a generalized Classifier.
The OCL used here is not normative.
Editor's notes: Missing close paren.
Expression: result = self.parents()->union(self.parents()->collect(p | p.allParents()))
Original: result = self.parents()->union(self.parents()->collect(p | p.allParents())

Signature: allFeatures() : Feature;
Description: The query allFeatures() gives all of the features in the namespace of the classifier. In general, through mechanisms such as inheritance, this will be a larger set than feature.
Expression: result = member->select(oclIsKindOf(Feature))

---

Send questions or comments to [email protected].