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Specify folder for resolving dsl model files? [message #1809626]

Fri, 19 July 2019 05:55

Nicholas Johnson

Messages: 12
Registered: March 2017

Junior Member

Is there a way to specify a location to search for referenced model files?

I have 2 DSL models (ModelA and ModelB) based on different ecore models where ModelB depends on ModelA. I think I have the EMF part working well enough (for now). I'm trying to generate some output using Acceleo of ModelB but it can't resolve the reference to ModelA, I believe because the URI on the ModelA file is relative to my eclipse project layout which is different from the file system layout.

Here is the eclipse project layout (eclipse Navigator)
- Project1
--- My.ModelA
- Project2
--- My.ModelB

Here is the actual filesystem layout:
- FolderX
--- Project1
----- My.ModelA
- FolderY
--- Project2
----- My.ModelB

In ModelB, ModelA is referenced as href="../Project1/My.ModelA#...." but this causes a problem when I run the Acceleo generation (I'm using the Java Application Runner as using the Acceleo Plugin Application fails for other reasons I don't understand) . When I output the info about an object referenced from ModelA is says eProxyURI: FolderY/Project1/My.ModelA, which is wrong.

I can create a symlink to make the filesystem look like the expected eclipse project layout and that works, but I think what I would like is to have the reference in the DSL model file to be "flat" (i.e href="My.ModelA#....") and then be able to specify a list of search locations for the DSL models (search path = { FolderX/Project1, FolderY/Project2 })

I'm open to other suggestions as well.

I've messed with EMF/Acceleo a little but I still don't know very much. I've seen some posts mentioning the use of a platform URI (?) but I didn't fully understand what that meant. All that to say I might need some hand-holding.

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Re: Specify folder for resolving dsl model files? [message #1809690 is a reply to message #1809626]

Sat, 20 July 2019 10:15

Ed Willink

Messages: 6840
Registered: July 2009

Senior Member

Hi

Yes it is possible, but unfortunately Acceleo's resolution of references is fundamentally unsound, since the treatment of 'platform:' as a virtual root while using Eclipse is not replicated when running standalone. It has been tweaked to make some common cases work, but IMHO it made the more general case worse and I had to adjust my references and overload malfunctioning routines. This was one of the reasons I am no longer an Acceleo user. If you want to solve the problem you may try using the org.eclipse.ocl.pivot.internal.resource.StandaloneProjectMap.initializeResourceSet() to initialize a ResourceSet so that accesses work sensibly, however you may need to override some Acceleo functionality to untweak the tweaks.

Regards

Ed Willink

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Re: Specify folder for resolving dsl model files? [message #1809850 is a reply to message #1809690]

Wed, 24 July 2019 19:05

Nicholas Johnson

Messages: 12
Registered: March 2017

Junior Member

Hmmmm.. ok. I'll try to dig into that soon to see if I can make any progess. The symlink is working good enough for now and I got pulled off with other things as the Acceleo stuff is only worked on when I have "free time".

If I could ask, what are you using instead of Acceleo?

[Updated on: Wed, 24 July 2019 19:06]

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Re: Specify folder for resolving dsl model files? [message #1809867 is a reply to message #1809850]

Thu, 25 July 2019 04:41

Ed Willink

Messages: 6840
Registered: July 2009

Senior Member

Hi

5 years ago I migrated all the Acceleo templates for OCL support to Xtend.

For future work I may consider QVTo. See http://www.eclipse.org/mmt/qvt/docs/OCL2018TextM2M/TextM2M.pdf

Regards

Ed Willink

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