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Intermediate properties for EObject ? [message #1593518]

Fri, 30 January 2015 18:04

Preetam Palwe

Messages: 9
Registered: October 2014

Junior Member

Hello there ...

May be quite naive question but still ...

I designed an ecore model and also generated java classes from it (using corresponding gen model) . I am using this model in a QVTO to perform this model to some other (xml) model transformation.

I came across a scenario where in I wanted to store an attribute to one of my model classes for a temporary reasons - I do not want to change the metamodel since its not "real" metadata attribute - and use that attribute in the QVTO.

In QVTO terminology I want to achieve something like but across Java and QVTO ...
intermediate property SomeModelClass::someTemporaryAttribute : TemporaryAttribute;

Means I want the attribute to be available in Java model so that I can populate it there and then when QVTO is invoked I can access it in QVTO ...

Is there any standard way available in EMF / EObject to achieve this kind of scenario ???

Any help in this regards is highly appreciated ...

Many Thanks !

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Re: Intermediate properties for EObject ? [message #1594236 is a reply to message #1593518]

Sat, 31 January 2015 05:39

Preetam Palwe

Messages: 9
Registered: October 2014

Junior Member

Hi

One thing I did was I added an attribute in the one of the generated Java model class (and NOT in ecore) with @generated NOT annotation so that I can populate the Java model with this temporary attribute but its not getting reflected in QVTO or in other words I am not able to access the newly added java attribute in QVTO
Any thoughts - why this might be the case ?

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Re: Intermediate properties for EObject ? [message #1594368 is a reply to message #1594236]

Sat, 31 January 2015 07:49

Ed Merks

Messages: 30132
Registered: July 2009

Senior Member

I can't answer how QVTO works in detail, but I expect it uses Ecore
reflection, not pure Java reflection, so it really needs a modeled
attribute, which you can make transient so that it's not serialized.

On 31.01.2015 06:39, Preetam Palwe wrote:
> Hi
> One thing I did was I added an attribute in the one of the generated
> Java model class (and NOT in ecore) with @generated NOT annotation so
> that I can populate the Java model with this temporary attribute but its
> not getting reflected in QVTO or in other words I am not able to access
> the newly added java attribute in QVTO Any thoughts - why this might be
> the case ?

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Re: Intermediate properties for EObject ? [message #1594415 is a reply to message #1594368]

Sat, 31 January 2015 08:30

Preetam Palwe

Messages: 9
Registered: October 2014

Junior Member

Thanks Ed

But EMF / EObject etc does not provide any out of the box mechanism for my requirement right ? If thats the case then I will write something custom ...

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Re: Intermediate properties for EObject ? [message #1594624 is a reply to message #1594415]

Sat, 31 January 2015 11:54

Ed Merks

Messages: 30132
Registered: July 2009

Senior Member

I can't comment on what's possible or not with QVTO.

On 31.01.2015 09:30, Preetam Palwe wrote:
> Thanks Ed
>
> But EMF / EObject etc does not provide any out of the box mechanism for
> my requirement right ? If thats the case then I will write something
> custom ...
>

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Re: Intermediate properties for EObject ? [message #1594716 is a reply to message #1594624]

Sat, 31 January 2015 13:24

Preetam Palwe

Messages: 9
Registered: October 2014

Junior Member

No Ed ... I am talking about general EMF here and not QVTO ...

Do we have any mechanism to add any custom property / attribute to generated model class or in general EMF EObject ???

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Re: Intermediate properties for EObject ? [message #1595102 is a reply to message #1594716]

Sat, 31 January 2015 19:43

Ed Merks

Messages: 30132
Registered: July 2009

Senior Member

No, there's no such thing as a custom property. What's described in the
Ecore model is all there is available. Of course you can add adapters
to eAdapters() and those could carry additional data. Or you can
maintain such data externally via a map. Or maybe
http://eclipse.org/facet/ helps.

On 31.01.2015 14:24, Preetam Palwe wrote:
> No Ed ... I am talking about general EMF here and not QVTO ...
> Do we have any mechanism to add any custom property / attribute to
> generated model class or in general EMF EObject ???

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