Search code examples
genericsumlclass-diagram

How to model an interface implementation in UML that is dependent from a property?

I have a class Properties with two properties: kind: Kind config: Config

with Kind as enum type with some string in it.

What's contained in Config depends on the value of kind.

How can I model that in UML?

If I have, for instance, an kind value of "Service" the config interface will be implemented as ServiceConfig. Would it be enough to add a constraint annotation on the connector between Config and ServiceConfig?

Solution

  • You model that with a constraint. This can be attached to either the class or the property itself. I can't write OCL but that would be the most formal way. However, a plain text enclosed in { braces } will do. See also https://www.uml-diagrams.org/constraint.html

    RE your edit:

    enter image description here

    The Config interface is realized by two classes (bottom right). The constraint just tells what at runtime has to be done in order to instantiate config. Of course it's missing details like what shall happen if at runtime kind will dynamically change etc.