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Trying to define attribute in class in diagram of type "Set<ComponentType>" [message #625320]

Thu, 03 December 2009 15:03

Eclipse User

I have a simple class diagram, with classes "Catalog" and "Category". I'll be adding many more classes, but these are the first two. There is a property of "Catalog" called "rootCategories", which should be a "Set<Category>". It's easy enough to define an association from Catalog to Category and label it on the source end with "rootCategories", but I'd like to define a "rootCategories" attribute of "Catalog" of type "Set<Category>".

I've created the two class icons, along with the association, but I don't understand the steps required to get that attribute created with that type.

Re: Trying to define attribute in class in diagram of type "Set<ComponentType>" [message #625324 is a reply to message #625320]

Fri, 04 December 2009 07:49

Eclipse User

It is not an easy question because when you create an attribute in the model this is not detected as an association till you don't also create an association between both classifiers. This is a two steps creation and not just the attributes creation.

If you use Java then I agree that if you create an attribute having set<category> then you will have an association between both classifiers. Don't forget that this is association detection is coming from the java tool using JDK and not from the UML model itself.

Re: Trying to define attribute in class in diagram of type "Set<ComponentType>" [message #625326 is a reply to message #625320]

Fri, 04 December 2009 09:02

Eclipse User

David,

Your question appears to be about Java generics but that isn't directly
supported by UML itself. I suppose something equivalent is a
multi-valued property that's unordered and unique, but even this, if
mapped to Ecore and then to Java will result in EList<Category> not
Set<Category>...

David M. Karr wrote:
> I have a simple class diagram, with classes "Catalog" and "Category".
> I'll be adding many more classes, but these are the first two. There
> is a property of "Catalog" called "rootCategories", which should be a
> "Set<Category>". It's easy enough to define an association from
> Catalog to Category and label it on the source end with
> "rootCategories", but I'd like to define a "rootCategories" attribute
> of "Catalog" of type "Set<Category>".
>
> I've created the two class icons, along with the association, but I
> don't understand the steps required to get that attribute created with
> that type.

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