[news.eclipse.modeling.mdt] Re: Creating objects with multi-valued child

[Kenn Hussey <Kenn.Hussey@xxxxxxxxx>]

I should clarify that, as Ed pointed out in another thread, the 
additional initialization should be done in a new/separate factory 
method. Likewise, the listener approach could present problems during 
serialization or copying, depending on whether notifications are enabled 
and/or when the listener processes the notifications it receives.

The approach that's taken in UML2 is to create factory methods on the 
classes themselves, rather than in the factory. This is one way to 
distinguish between the default methods provided, and required, by the 
EMF framework, and convenience methods that are need by clients of your 
API...

Kenn

Kenn Hussey wrote:
> Doug,
>
> Yes, modifying the factory to do additional initialization for newly 
> created objects would make sense. An alternative would be to attach a 
> listener which detects creation/addition of a new car and responds by 
> creating/adding the necessary tires.
>
> Kenn
>
> Doug Bercot wrote:
> > If I were to create a simple object that has a containment association 
> > with an N..N value (as shown in the "simple" model below), is there a 
> > proper place in which I can modify the generated code such that the 
> > contained objects are always of the correct number?
> >
> > In this example, could I modify one of the factories such that a "Car" 
> > object is always created with 4 "Tire" child objects?
> >
> > TIA
> >
> > <?xml version="1.0" encoding="UTF-8"?>
> > <ecore:EPackage xmi:version="2.0"
> >    xmlns:xmi="http://www.omg.org/XMI"; 
> > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> >    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore"; name="simple"
> >    nsURI="http://nunjobiznezz.com/emf/simple"; nsPrefix="simple">
> >  <eClassifiers xsi:type="ecore:EClass" name="Car">
> >    <eStructuralFeatures xsi:type="ecore:EReference" name="tires" 
> > lowerBound="4" upperBound="4"
> >        eType="#//Tires" containment="true"/>
> >  </eClassifiers>
> >  <eClassifiers xsi:type="ecore:EClass" name="Tires"/>
> > </ecore:EPackage>