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How can I get the corresponding GenClass of an EClass [message #1744752]

Thu, 29 September 2016 18:38

Eclipse User

I have an EClass an need its fqn for code generation. The information I need is in the coresponding GenClass but there is no direkt link between the EClass and its GenClass. Are there utils to find the GenClass for an EClass ?

Re: How can I get the corresponding GenClass of an EClass [message #1744810 is a reply to message #1744752]

Fri, 30 September 2016 07:24

Eclipse User

Hi

(Ed M may give you a better answer.)

The key to the mapping is the registrations in EcorePlugin.ePackageNsURIToGenModelLocationMap. This populated automatically if you are running within Eclipse. You need to wind up the EcorePlugin.ExtensionProcessor if running standalone.

Regards

Ed Willink

Re: How can I get the corresponding GenClass of an EClass [message #1744860 is a reply to message #1744810]

Fri, 30 September 2016 16:33

Eclipse User

HI Ed,

thank you for this information, but I still don't know which methods I have to call to get from an EClass object to it's GenClass object.
Can you give me some more information on that ?

A small code example would be nice.

Re: How can I get the corresponding GenClass of an EClass [message #1744870 is a reply to message #1744860]

Sat, 01 October 2016 02:20

Eclipse User

Sorry, I posted yesterday, but somehow it got lost. As the other Ed suggested, EcorePlugin.getEPackageNsURIToGenModelLocationMap(true) returns a map from nsURI to URI for the corresponding GenModel-containing resource. So given an EClass you can use eClass.getEPackage().getNsURI() to look up that EClass' GenModel's URI in that map. You can load that URI into your resource set (resourceSet.getResource(uri, true)), and use EcoreUtil.getObjectByType(resource.getContents(), GenModelPackage.Literals.GEN_MODEL) to fetch the GenModel from that loaded resource; I suggest this approach because the resource might actually be a *.xcore not just a *.genmodel, and in such a resource, the GenModel is not the first object in the contents. Then use GenModel.findEClassifier to find the corresponding GenClass in that GenModel for the eClass you started with.

Re: How can I get the corresponding GenClass of an EClass [message #1744882 is a reply to message #1744870]

Sat, 01 October 2016 05:56

Eclipse User

Thank you for the detailed description. Unfortunately I can not find the last function GenModel.findEClassifier. Can you give me more details on that function. In which class can I find this method ?

Re: How can I get the corresponding GenClass of an EClass [message #1744903 is a reply to message #1744882]

Sun, 02 October 2016 03:04

Eclipse User

Sorry, typo, it's org.eclipse.emf.codegen.ecore.genmodel.GenModel.findGenClassifier(EClassifier)

Re: How can I get the corresponding GenClass of an EClass [message #1745071 is a reply to message #1744903]

Tue, 04 October 2016 14:28

Eclipse User

Thank you, I made the following function from you information:

def getGenClassifier(EClassifier eClassifier) {
	val nsUri = eClassifier.EPackage?.nsURI
	val rs = eClassifier.eResource?.resourceSet
	if (nsUri != null && rs != null){
		val map = EcorePlugin.getEPackageNsURIToGenModelLocationMap(true)
		val gmUri = map.get(nsUri)
		val resource = rs.getResource(gmUri, true)
		val genModel = EcoreUtil.getObjectByType(resource.contents, GenModelPackage.Literals.GEN_MODEL) as GenModel
		genModel.findGenClassifier(eClassifier)
	}
}

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