Bug 479019

Description Cedric Brun 2015-10-05 04:46:55 EDT

This is a follow-up on Bug 461498.

The fix for the bug 461498 leveraged the MetamodelDescriptorProvider extension point by declaring implementers whithin Sirius itself which would systematically declare Sirius's ecore models.

Problem is : based on the way the extension point and API is designed, implementers are not called if no Viewpoint is selected which leads to the following scenario :

- open a modeling project with no enabled Viewpoints
- open the interpreter view and select a semantic element in the project
- write a query which needs some knownledge of the Sirius metamodels to be executed, for instance : aql:self.eInverse(diagram::DSemanticDiagram)
=> see that you get an error "invalid type literal" instead of having the result of the query.

The ability to evaluate such queries even when no Viewpoint has been selected if actually used quite a lot in the JUnit Unit tests of Sirius itself, in particular in all the DiagramIntegrityTestCase subclasses. This works in the case of Acceleo2/Query legacy as the implementation will try and look for the EPackage itself, though for AQL we chose to only rely on explicitely declared metamodels which means we can't migrate those tests to AQL unless we fix this issue.