class diagram - same class/interface more than once

marton_sigmond · Joined: 13 Nov 2007 Posts: 10 Location: Hungary

If I am about to insert a class/interface into a diagram (popup->Insert->Class/Interface), and that type already exists in that diagram, I get the following error message: The type "TypeName" exists in this diagram.

This is a very serious limitation.
Please change it.

Thanks,
Marton

dominiksh · Joined: 18 Jun 2007 Posts: 5

I agree with Marton. The possibility to insert a class (interface, enum) into a diagram more than once would be really helpful, especially when working with large diagrams.

yves.yang · Site Admin Joined: 04 Aug 2006 Posts: 462

Hi,

We just control the unicity of the type in a package. I cannot see the problem. You can put other class, interface and enum more than once if the name is differnent. Or I misunderstand your point.

Best regards
Yves YANG

marton_sigmond · Joined: 13 Nov 2007 Posts: 10 Location: Hungary

Hi Yves YANG,

please follow this procedure and you will understand the point:
1) Open up a class diagram
2) Right click with the mouse on the diagram
3) Go into the Insert submenu
4) Select Class
5) Type JButton (for example)
6) Hit Enter
The JButton class appears in the diagram.
Now repeat the steps from 2 to 6, and when you hit Enter again you will get the following error message: The type "JButton" exists in this diagram.

Regards,
Marton

yves.yang · Site Admin Joined: 04 Aug 2006 Posts: 462

You cannot create the second JButtton. It is an expected behavior. I cannot see the problem.

best regards
Yves YANG

marton_sigmond · Joined: 13 Nov 2007 Posts: 10 Location: Hungary

Yves YANG,

let us distinguish the creation and the insertion of a class.

Naturally, creating two classes with the same name in the same package is wrong, so avoiding this is expected.

However, inserting the same class into the same diagram two times should be allowed.

Of course I did not want to create the javax.swing.JButton class at all.
But I did want to insert it two times into my diagram.

Please follow the steps from my previous post, and you will understand what I am talking about.

Thanks,
Marton

yves.yang · Site Admin Joined: 04 Aug 2006 Posts: 462

OK, I get your point. Yes, you may have only one graphic prensentation of a type in a diagram. We think it may introduce some troubles if we allow more than one, for example, how display the inheritance, association and dependence.

Best regards
Yves YANG