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XPand et inheritance [message #537063]

Tue, 01 June 2010 04:43

jeremie
Messages: 233
Registered: April 2010

Senior Member

Hi,

I have a problem to treat inheritance with XPand,
For example, I have this model :

class A {
   private B : elementB;
}

interface B{}

classe C implements B {}

classe D implements B {}

classe E implements B {}

I will like to do specific treatment for each classes C D and E,

T XPand fille look like this :

«IMPORT model»;


«DEFINE a FOR A»
«EXPAND ... FOR this.elementB»
«ENDDEFINE»

I don't know what I have to write in the EXPAND line because this.elementB can be of type C, D or E..
we can imagine I have a file TreatC.xpt, TreatD.xpt or TreatE.xpt, to make a specific treatment for each type of element.

Thanks.

Jérémie

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Re: XPand et inheritance [message #537081 is a reply to message #537063]

Tue, 01 June 2010 05:23

MaximeLecourt
Messages: 108
Registered: February 2010
Location: France

Senior Member

Are classe C, classe D, classe E different types from your metamodel ?

If yes, Xpand supports polymorphism, so you just have to define 3 different templates, one for classe C type, one for classe D type, and one for classe E type.

One day I shall master M2T, but that day has yet to come...

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Re: XPand et inheritance [message #537086 is a reply to message #537081]

Tue, 01 June 2010 05:39

jeremie
Messages: 233
Registered: April 2010

Senior Member

yes they are different type in my metamodel.
I have make a template for each one,
the problem is that I don"t know how to call this template in the file treatA.xpt.
if there is something equivalent to "instanceof" in XPand it could resole my problem.
I could do something like that :

....
«DEFINE a FOR A»
«IF this.elementB instanceof C»
	«EXPAND TreatC::c FOR this.elementB»
«ENDIF»
«IF this.elementB instanceof D»
	«EXPAND TreatD::d FOR this.elementB»
«ENDIF»
«IF this.elementB instanceof E»
	«EXPAND TreatE::e FOR this.elementB»
«ENDIF»
«ENDDEFINE»

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Re: XPand et inheritance [message #537095 is a reply to message #537086]

Tue, 01 June 2010 06:18

jeremie
Messages: 233
Registered: April 2010

Senior Member

Is there in XPand something equivalent to "instanceof"? or an other way to do something like that?

thanks,

Jérémie

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Re: XPand et inheritance [message #537100 is a reply to message #537063]

Tue, 01 June 2010 06:45

MaximeLecourt
Messages: 108
Registered: February 2010
Location: France

Senior Member

You don't need any "instanceof"

You can just do it that way :

RInteger, RBool, RFloat and RString have RDatatype for ESuper type.

Quote:

«EXPAND tosql FOR RDatatype»

«DEFINE tosql FOR RInteger»INTEGER«ENDDEFINE»
«DEFINE tosql FOR RBool»BOOLEAN«ENDDEFINE»
«DEFINE tosql FOR RFloat»DOUBLE«ENDDEFINE»
«DEFINE tosql FOR RString»VARCHAR(40)«ENDDEFINE»

One day I shall master M2T, but that day has yet to come...

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