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[QVTO] access to transformation properties [message #512635]

Fri, 05 February 2010 17:32

Andrea

Messages: 2
Registered: February 2010

Junior Member

Hi,

I'm writing a qvto script that exploits the import capability by access semantic.
I need to access to the non-intermediate contextual properties of the imported qvto scripts.
An imported script property is accessible from the instantiator except when it is inherited.

For example, let's define an imported script A.qvto and a script Main.qvto

-- A.qvto file
transformation A();
property info : String = '';
main() {
info := 'A';
}

-- Main.qvto file
import A;
transformation Main() access A;
main() {
var a := new A();
assert fatal(a.info='');
a.transform();
assert fatal(a.info='A');
}

It works fine in this case. Instead, it's not working in the following case.
Let's define a B.qvto as extension of A.qvto and modify Main.qvto.

-- B.qvto file
import A;
transformation B() extends A;
main() {
info := 'B';
}

-- Main.qvto file
import B;
transformation Main() access B;
main() {
var b := new B();
b.transform();
assert fatal(b.info='B');
}

Inherited property 'info' is accessible from B.qvto, but it is not accessible from Main.qvto.
Indeed, line "info := 'B'" works correctly and it is raised "Unrecognizable variable (info)" exception in line "assert fatal(b.info='B')".

Could the qvto engine be modified in order to access to inherited properties from the instantiator?
Thanks a lot!

Cheers,
Andrea

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Re: [QVTO] access to transformation properties [message #513320 is a reply to message #512635]

Tue, 09 February 2010 18:09

Sergey Boyko

Messages: 171
Registered: July 2009

Senior Member

Hi Andrea ,

It's indeed looks like a bug.

Could you please raise bugzilla on that?
https://bugs.eclipse.org/bugs/enter_bug.cgi?bug_status=NEW&a mp;component=QVT_OML-Engine&form_name=enter_bug&prod uct=M2M&version=2.0

Regards,
Sergey

Andrea wrote:
> Hi,
>
> I'm writing a qvto script that exploits the import capability by access
> semantic.
> I need to access to the non-intermediate contextual properties of the
> imported qvto scripts.
> An imported script property is accessible from the instantiator except
> when it is inherited.
>
> For example, let's define an imported script A.qvto and a script Main.qvto
>
> -- A.qvto file
> transformation A();
> property info : String = ''; main() {
> info := 'A';
> }
>
> -- Main.qvto file
> import A;
> transformation Main() access A;
> main() {
> var a := new A();
> assert fatal(a.info='');
> a.transform();
> assert fatal(a.info='A');
> }
>
> It works fine in this case. Instead, it's not working in the following
> case. Let's define a B.qvto as extension of A.qvto and modify Main.qvto.
>
> -- B.qvto file
> import A;
> transformation B() extends A;
> main() {
> info := 'B';
> }
>
> -- Main.qvto file
> import B;
> transformation Main() access B;
> main() {
> var b := new B();
> b.transform();
> assert fatal(b.info='B');
> }
>
> Inherited property 'info' is accessible from B.qvto, but it is not
> accessible from Main.qvto.
> Indeed, line "info := 'B'" works correctly and it is raised
> "Unrecognizable variable (info)" exception in line "assert
> fatal(b.info='B')".
>
> Could the qvto engine be modified in order to access to inherited
> properties from the instantiator?
> Thanks a lot!
>
> Cheers,
> Andrea

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