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modifying xmi model file [message #1856506]

Tue, 13 December 2022 15:57

wld blm

Messages: 6
Registered: December 2022

Junior Member

Hello everyone,

I'm new to EMF and I need to adding "assets" to my EMF model that I loaded from an XMI file. I have to pick up that assets from my metamodel XMI file that I also loaded in my code.
I'm not sure where to begin but here is what I'v done so far.

ResourceSet resourceSet = new ResourceSetImpl();
        resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("xmi", new XMIResourceFactoryImpl());
        resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("xmi", new  XMIResourceFactoryImpl());

        Resource myMetaModel = resourceSet.getResource(URI.createFileURI(filePathMetamodel), true);

        EPackage univEPackage = (EPackage) myMetaModel.getContents().get(0);
        resourceSet.getPackageRegistry().put("*", univEPackage);
        Resource myModel = resourceSet.getResource( URI.createURI( filePathModel), true);

        EcoreFactory theCoreFactory = EcoreFactory.eINSTANCE;
        EClass adultEClass= theCoreFactory.createEClass();
        univEPackage.getEClassifiers().add(adultEClass);

        EFactory univInstance = univEPackage.getEFactoryInstance();
        EObject adultObject = univInstance.create(adultEClass);

        EList<EObject> ModelObjects = new BasicEList<EObject>();
        ModelObjects.add(adultObject);

        myModel.getContents().addAll(ModelObjects);

        myModel.save(null);
        myMetaModel.save(null);

The problem here is that it's creating a new Eclass and then add it to my metamodel and then my model but what I want to do is choose it directly from my metamodel and add it to my model is it possible ?

Thanks

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Re: modifying xmi model file [message #1856507 is a reply to message #1856506]

Tue, 13 December 2022 16:37

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

I think it still needs to be like resourceSet.getPackageRegistry().put(univEPackage.getNsURI(), univEPackage). I assume that univEPackage .getEClassifiers() returns a list of classifiers already in that model. Presumably some of those are EClasses and then presumably you want to use univEPackage .getEFactoryInstance().create(...) or use EcoreUtil.create(EClass).

Don't neglect using the debugger to inspect what's happening and to understand the data available in the data structures.

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: modifying xmi model file [message #1856509 is a reply to message #1856507]

Tue, 13 December 2022 16:48

wld blm

Messages: 6
Registered: December 2022

Junior Member

Thanks for your answer,
I forgot to mention that I tried to get an EClass from the univEPackage with

EObject adultObject = univEPackage.getEFactoryInstance().create(univEPackage.getEClassifiers().get(0).eClass());

but when i run my code i have this exception

The class 'EClass' is not a valid classifier

I feel like I'm missing something..

Thanks

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Re: modifying xmi model file [message #1856523 is a reply to message #1856509]

Wed, 14 December 2022 06:24

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

Again, use the debugger. It's very clear you have not done that in an attempt to answer your own question before asking it here. An EClassifier might be an EClass, and EDataType or an EEnum. But in all cases the .eClass() of any EClassifer that you fetched from the univEPackage (or any EPackage), will be an EClass from EcorePackage.eINSTANCE.getClassifiers().

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: modifying xmi model file [message #1856539 is a reply to message #1856523]

Wed, 14 December 2022 11:54

wld blm

Messages: 6
Registered: December 2022

Junior Member

Sorry but with all due respect I did use the debugger. Maybe I use it wrong and you can help me and telling me which attribute of my EClassifier should I look into to know if it is an Eclass, because for me when I look at it on the debugger i can clearly see that its and EClass. Thanks

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Re: modifying xmi model file [message #1856542 is a reply to message #1856539]

Wed, 14 December 2022 13:33

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

This is how to create an instance of every EClass supported by an EPackage:

    EPackage myPackage = GitPackage.eINSTANCE;
    for (EClassifier eClassifier : myPackage.getEClassifiers())
    {
      if (eClassifier instanceof EClass)
      {
        EClass eClass = (EClass)eClassifier;
        if (eClass.eClass() == EcorePackage.Literals.ECLASS)
        {
          System.out.println("Yes, the eClass() of any EClass is EcorePackage.Literals.ECLASS");
        }
        if (!eClass.isAbstract())
        {
          EObject eObject = EcoreUtil.create(eClass);
          System.out.println(eObject);
        }
      }
    }

For some reason you decided to get the eClass() of your classifier rather than test if your classifier is an EClass or not...

Ed Merks
Professional Support: https://www.macromodeling.com/

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