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Load Hutn file programmatically [message #1839614]

Wed, 24 March 2021 15:22

jo ber

Messages: 94
Registered: August 2018

Member

Hi

I'm trying to load programmatically an hutn file. However, I'm getting the following error:

Exception in thread "main" Could not parse HUTN: 
Line: 3, Column: 2, Reason: Unrecognised namespace URI: families
	at org.eclipse.epsilon.emc.hutn.HutnModel.load(HutnModel.java:79)
	at org.eclipse.epsilon.emc.hutn.HutnModel.load(HutnModel.java:95)
	at org.eclipse.epsilon.eol.models.Model.load(Model.java:92)
	at home.experiments.epsilon.Transformation.<init>(Transformation.java:22)
	at home.experiments.epsilon.Transformation.main(Transformation.java:11)
Caused by: Could not parse HUTN: 
Line: 3, Column: 2, Reason: Unrecognised namespace URI: families
	... 5 more
Caused by: org.eclipse.epsilon.hutn.exceptions.HutnGenerationException: Could not parse HUTN: 
Line: 3, Column: 2, Reason: Unrecognised namespace URI: families
	... 5 more

Even if I can understand the problem, I don't see how I can specify the meta model to use when instantiating "HutnModel". I've attached a minimal example.

Thank you for your help and kind regards,

Attachment: home.experiments.epsilon.zip
(Size: 11.83KB, Downloaded 72 times)

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Re: Load Hutn file programmatically [message #1839625 is a reply to message #1839614]

Wed, 24 March 2021 18:27

Dimitris Kolovos

Messages: 2163
Registered: July 2009
Location: York, UK

Senior Member

Hi Jo,

Before you can load the HUTN model you will need to parse the metamodel file and put its Families EPackage in the global EMF package registry as shown in https://www.eclipse.org/epsilon/doc/articles/epsilon-emf/#how-do-i-load-an-ecore-metamodel

Best,
Dimitris

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Re: Load Hutn file programmatically [message #1839647 is a reply to message #1839625]

Thu, 25 March 2021 07:50

jo ber

Messages: 94
Registered: August 2018

Member

Hi Dimitris

Thank you for your answer. Unfortunately, it didn't help (see attachment, just in case I missed something)...

I've tried to investigate to build my own understanding. An 'HutnModel' will automatically trigger the generation of an 'EmfModel'. I noticed that this generator requires a the meta model file which seems to be always null:
https://git.eclipse.org/c/epsilon/org.eclipse.epsilon.git/tree/plugins/org.eclipse.epsilon.hutn.engine/src/org/eclipse/epsilon/hutn/HutnModule.java#n211

Is there a way to set this parameter 'spec.modelFile'?

Kind regards,

Attachment: home.experiments.epsilon.zip
(Size: 12.73KB, Downloaded 71 times)

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Re: Load Hutn file programmatically [message #1839652 is a reply to message #1839647]

Thu, 25 March 2021 08:19

Dimitris Kolovos

Messages: 2163
Registered: July 2009
Location: York, UK

Senior Member

Hi,

Adding the following statement before ecoreResourceSet.createResource should do the trick.

ecoreResourceSet.getPackageRegistry().put(EcorePackage.eINSTANCE.getNsURI(), EcorePackage.eINSTANCE);

Best,
Dimitris

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Re: Load Hutn file programmatically [message #1839654 is a reply to message #1839652]

Thu, 25 March 2021 09:08

jo ber

Messages: 94
Registered: August 2018

Member

this solution fixed my issue. thank you

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