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[ETL] Why do I get dynamicEObjects? [message #1386682]

Thu, 19 June 2014 12:46

Hristofor Mirchev

Messages: 3
Registered: June 2014

Junior Member

Hi guys,

I am looking for m2m transformation languages for a project I have and I am currently considering Epsilon as the option that best suites me. So naturally I started playing around with the examples from the site to get the hang of it. I started with the simplest Tree2Graph one. I manually downloaded the two .ecore files, the .etl file, the .model and the launch.xml, put them in a project edited the launch.xml to point to the .ecores correctly, I registered the .ecores and ran the transformation. It worked flawlessly.

My question came when I started playing around with the transformation rule. I inserted a simple "t.parent.print()" expecting to see an instance of "Tree" and was surprised that it was actually a dynamicEObject pointing to a "Tree". My question is why does this happen and can I get it to be a reference to "Tree" as for my project I'd need to do a simple manipulation over the original emf model entity.

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Re: [ETL] Why do I get dynamicEObjects? [message #1386709 is a reply to message #1386682]

Thu, 19 June 2014 17:09

Dimitris Kolovos

Messages: 2165
Registered: July 2009
Location: York, UK

Senior Member

Hi Hristofor,

Since you've not generated Java code from Tree.ecore, the Epsilon EMF driver loads your model reflectively (i.e. as a bunch of DynamicEObjects) - which is the expected behaviour. I realise that this can be confusing so if you have any further questions please don't hesitate to ask.

Cheers,
Dimitris

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Re: [ETL] Why do I get dynamicEObjects? [message #1386784 is a reply to message #1386682]

Fri, 20 June 2014 12:49

Hristofor Mirchev

Messages: 3
Registered: June 2014

Junior Member

Hey man,

thanks for the fast reply.

So, assuming everything is okay with my project, since i have generated model code for my metamodels it should work as I intend. Thanks for clearing it up. I'll give it a go and try implementing a transformation for my project this weekend.

I'll keep this topic open if I run into the problem again Rolling Eyes

Thanks again for the fast and friendly reply.

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Re: [ETL] Why do I get dynamicEObjects? [message #1386821 is a reply to message #1386784]

Fri, 20 June 2014 21:03

Dimitris Kolovos

Messages: 2165
Registered: July 2009
Location: York, UK

Senior Member

Hi Hristofor,

You're welcome. A couple of things to keep in mind when you give this a go: 1) you should run your transformation in a workbench spawned from the workbench where you have generated the Java code, 2) in your new workbench, you don't need to register Tree.ecore using the right-click menu. Any problems, let me know.

Cheers,
Dimitris

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Re: [ETL] Why do I get dynamicEObjects? [message #1386889 is a reply to message #1386821]

Sun, 22 June 2014 14:49

Hristofor Mirchev

Messages: 3
Registered: June 2014

Junior Member

Ok, I guess, I am missing something as I can't seem to make it work.

I've made a small example to illustrate, so can I send it to you with steps to reproduce so you can have a look and explain to me what I'm doing wrong?

Regards,
Hristofor

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