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subclass override field [message #420994]

Mon, 21 July 2008 06:35

yeliu

Messages: 145
Registered: July 2009

Senior Member

Hello,
I have 2 questions:
1. there is an abstract class which contains an attribute String
source.In its subclass ,I want to have an EList<String> sourceList instead
of a string and I also don't want the attribute source shown in the
generated editor.How do I implement this in annotated Java code?
2.the abstract class Obj mentioned above have bidirectional relations
with another class Chan.Let's call the relations [Obj]
inputs<----->outgoing[Chan].I want the multipilicity of the relations
varies according to different subclasses of Obj.E.g subclass Net may have
only one outgoing,subclass Gather may have the same number of outgoing as
Rate(int) which is an attribute of Gather.How should I set these
constrictions?

Many thanks!

Ye Liu

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Re: subclass override field [message #420995 is a reply to message #420994]

Mon, 21 July 2008 07:14

Eike Stepper

Messages: 6682
Registered: July 2009

Senior Member

Hi Ye Liu,

Comments below...

Ye Liu schrieb:
> Hello,
> I have 2 questions:
> 1. there is an abstract class which contains an attribute String
> source.In its subclass ,I want to have an EList<String> sourceList
> instead of a string and I also don't want the attribute source shown
> in the generated editor.How do I implement this in annotated Java code?
You can't have a feature in a derived class *instead* of a feature in a
super class. That said, you can hide properties in the Properties view
by overriding the getPropertyDescriptors() method in the generated
DerivedClassItemProvider class.

> 2.the abstract class Obj mentioned above have bidirectional relations
> with another class Chan.Let's call the relations [Obj]
> inputs<----->outgoing[Chan].I want the multipilicity of the relations
> varies according to different subclasses of Obj.E.g subclass Net may
> have only one outgoing,subclass Gather may have the same number of
> outgoing as Rate(int) which is an attribute of Gather.How should I set
> these constrictions?
I don't think that you can express such constraints in Ecore. Maybe
these links are helpful:
http://help.eclipse.org/stable/index.jsp?topic=/org.eclipse. emf.doc/references/overview/EMF.Validation.html
http://www.eclipse.org/articles/article.php?file=Article-EMF -Codegen-with-OCL/index.html

Cheers
/Eike

>
> Many thanks!
>
>
> Ye Liu
>

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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