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EMF attributes overriding [message #418595]

Mon, 21 April 2008 16:34

Eclipse User

Hello,
is it possible to override attributes of classes in an EMF model (ecore
file)?

Into my ecore I have a class A with the attribute "name" with lower bound
set to 0 and upper bound set to 1. Then I have a class B that inherits
from A but in B I need to set the lower bound of the attribute "name" to 1.
If I simply redefine the "name" attribute in B as a result I obtain two
different "name" attributes in B, the one inherited from A and the one
defined in B!!!

Maybe I need to change some properties of the "name" attribute in A or in
B?

Thanks to all
Enrico

Re: EMF attributes overriding [message #418600 is a reply to message #418595]

Mon, 21 April 2008 16:51

Eclipse User

This is a multi-part message in MIME format.
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Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Content-Transfer-Encoding: 7bit

Enrico,

No, EMF doesn't support redefining or overriding features. You could
define an named constraint on B and then implement it to check that the
name is actually set.

http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse. emf.doc//references/overview/EMF.Validation.html

Enrico wrote:
> Hello,
> is it possible to override attributes of classes in an EMF model
> (ecore file)?
>
> Into my ecore I have a class A with the attribute "name" with lower
> bound set to 0 and upper bound set to 1. Then I have a class B that
> inherits from A but in B I need to set the lower bound of the
> attribute "name" to 1.
> If I simply redefine the "name" attribute in B as a result I obtain
> two different "name" attributes in B, the one inherited from A and the
> one defined in B!!!
>
> Maybe I need to change some properties of the "name" attribute in A or
> in B?
>
>
>
> Thanks to all
> Enrico
>

--------------090109010707040805040207
Content-Type: text/html; charset=ISO-8859-15
Content-Transfer-Encoding: 8bit

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-15"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Enrico,<br>
<br>
No, EMF doesn't support redefining or overriding features.

Re: EMF attributes overriding [message #418603 is a reply to message #418600]

Mon, 21 April 2008 17:21

Eclipse User

Ok, understood!
Thank you for your hint on named constraints.

Ed Merks wrote:

> Enrico,

> No, EMF doesn't support redefining or overriding features. You could
> define an named constraint on B and then implement it to check that the
> name is actually set.

>
http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse. emf.doc//references/overview/EMF.Validation.html

> Enrico wrote:
>> Hello,
>> is it possible to override attributes of classes in an EMF model
>> (ecore file)?
>>
>> Into my ecore I have a class A with the attribute "name" with lower
>> bound set to 0 and upper bound set to 1. Then I have a class B that
>> inherits from A but in B I need to set the lower bound of the
>> attribute "name" to 1.
>> If I simply redefine the "name" attribute in B as a result I obtain
>> two different "name" attributes in B, the one inherited from A and the
>> one defined in B!!!
>>
>> Maybe I need to change some properties of the "name" attribute in A or
>> in B?
>>
>>
>>
>> Thanks to all
>> Enrico
>>

Re: EMF attributes overriding [message #418607 is a reply to message #418600]

Mon, 21 April 2008 18:13

Eclipse User

Hey Ed,

> http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse. emf.doc//references/overview/EMF.Validation.html

Notice that the page does not longer has a reference in the Table of
Contents tree on the left frame.

On other hand, this page can be found in the tree and it displays the
breadcrumb at the top.

http://help.eclipse.org/help33/topic/org.eclipse.emf.validat ion.doc/references/overview/languages.html

Is there any reason for that? I am just curious.

Re: EMF attributes overriding [message #418608 is a reply to message #418607]

Mon, 21 April 2008 18:22

Eclipse User

AJ,

Maybe Nick will understand the question...

AJ wrote:
> Hey Ed,
>
>> http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse. emf.doc//references/overview/EMF.Validation.html
>>
>
> Notice that the page does not longer has a reference in the Table of
> Contents tree on the left frame.
>
> On other hand, this page can be found in the tree and it displays the
> breadcrumb at the top.
>
> http://help.eclipse.org/help33/topic/org.eclipse.emf.validat ion.doc/references/overview/languages.html
>
>
> Is there any reason for that? I am just curious.
>

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