Bug 463225

Description Cedric Brun 2015-03-26 12:47:19 EDT

Validation and completion services (used in the .odesign editor and in the interpreter view) are relying on org.eclipse.sirius.common.tools.api.interpreter.CompoundInterpreter.INSTANCE, always interrogating this instance to retrieve the "right interpreter for the given expression". 

This singleton will use only one IInterpreter instance for each language, though expression contexts (activated metamodels, imported classes, projects in the scope) might be different in between calls. Leading to reported errors or worse.

Here is the change I propose :
- to implement such services, instead of reusing the same IInterpreter instances create a *new one*, dispose it when the service is done.
- provide an utility method which does all the setup of an IInterpreter instance from a IInterpreterContext.
- use this setup method in the callees.

In doing so each interpreter (and more especially AQLSiriusInterpreter) will no more have to do their own setup based on the given IInterpreterContext, Callees code have to do that otherwise we can't know if this change of configuration will have effects on an instance which is used in a completely different context.