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How to create an object Map in a class diagram ? [message #1821154]

Thu, 06 February 2020 11:54

Gregory Roche

Messages: 11
Registered: February 2020

Junior Member

Hello,

I'm looking for a tutorial about class diagram with Papyrus.

I don't find how to create my diagram for generating the code bellow :

Map<String, IRobot> shapes = new HashMap<String, IRobot>();

Thanks.

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Re: How to create an object Map in a class diagram ? [message #1821173 is a reply to message #1821154]

Thu, 06 February 2020 14:28

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Maps are very much the poor relation of Collections in UML.

It is possible to use qualified associations, but you won't find very much tooling that supports it adequately. Certainly when I tried to get it working with EMF, I hit major limitations in EMF's EMap and gave up.

Alternatively you may define your own custom templated types, possibly targeted on the Map class added to Eclipse OCL in the last few years.

In my experience, collection/map classes are often just a pragmatism for more useful application classes. Once you start using an application class, the inadequacies of collections/maps vanish.

Regards

Ed Willink

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Re: How to create an object Map in a class diagram ? [message #1821175 is a reply to message #1821173]

Thu, 06 February 2020 15:27

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Sorry. A bit confusing. What I meant was that the typical Map.Entry<key : K, value : V> can be reified as MyEntry{key : MyKey, value : MyValue, more properties, useful operations} and maintained as a Set<MyEntry>.

Regards

Ed Willink

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Re: How to create an object Map in a class diagram ? [message #1821181 is a reply to message #1821175]

Thu, 06 February 2020 16:53

Gregory Roche

Messages: 11
Registered: February 2020

Junior Member

Ok, thank you for your answer.

I'm newbie under Papyrus. And I see what for the moment, I can obtain this simple code :

AClass<String>

I founded this tutorial on Youtube, but I haven't obtain the result :
https://www.youtube.com/watch?v=Z3u5fSWkP-A&list=PLQuZvNs1nWi03IRLNhtaW4Ul_Ego9Rp91&index=14&t=388s

I'm looking for an updated tutorial for creating Generics in Java ?

Thanks.

[Updated on: Sat, 08 February 2020 19:43]

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