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 Eclipse UML2 Project  |  Technology Exchange  |  © 2004 IBM Corporation
Element Validation
§Wanted a way to perform validation operations on elements
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§Wanted to be able to evaluate different sets of constraints
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§Implemented custom Switch subclasses to execute validation rules
§implemented validate(EObject, IProgressMonitor) to invoke the switch and return an outcome in the form of a status object
§overrode Uml2Switch#defaultCase(EObject) to recursively invoke the switch on the object’s contents
§overrode Uml2Switch#doSwitch(EObject) to inform the progress monitor of progress
§overrode Uml2Switch#case*(*) for each type of element to which constraints apply