1	Eclipse UML2 Project Technology Exchange EMF Technology in Practice
2	Contents What is UML2? EMF Customizations Element Identification Element Creation Element Destruction Element Retrieval Element Validation
3	What is UML2? An Eclipse Modeling Development Tools subcomponent at http://www.eclipse.org/modeling/mdt/?project=uml2#uml2 An EMF-based implementation of the UML™ 2.0 metamodel for the Eclipse platform Objectives are to provide… a useable implementation of the metamodel to support the development of modeling tools a common XMI schema to facilitate interchange of semantic models test cases as a means of validating the specification validation rules as a means of defining and enforcing levels of compliance
4	EMF Customizations XMI resource to support identification of elements using Universally Unique Identifiers (UUIDs) JET templates to generate methods that facilitate element creation, destruction, and retrieval Switch classes to perform element validation operations
5	Element Identification Needed a way to uniquely identify elements across resources Wanted to minimize the impact on disk and memory footprint Implemented a custom XMI resource (Uml2ResourceImpl) to assign and manage UUIDs generated in base 64 format… overrode ResourceImpl#getEObjectByID(String) to retrieve objects from idToEObectMap overrode XMLResourceImpl#getID(EObject) to assign (and reassign) automatically generated UUIDs overrode ResourceImpl#detached(EObject) to preserve IDs when objects (and their children) are detached from resources
6	Overriding ResourceImpl#getEObjectByID(String)
7	Overriding XMLResourceImpl#getID(EObject)
8	Overriding ResourceImpl#detached(EObject)
9	Element Identification Example
10	Element Creation Wanted to simplify the process of creating an element and adding/setting it to a containment feature Customized JET templates to generate convenient factory methods customized Interface.javajet to generate method declaration customized Class.javajet to generate method implementation
11	Customizing Interface.javajet (Lists)
12	Customizing Interface.javajet (non-Lists)
13	Customizing Class.javajet (Lists)
14	Customizing Class.javajet (non-Lists)
15	Element Creation Example
16	Element Destruction Wanted a way to delete an element, including all of its children and all cross references to it Customized JET templates to generate destroy() method for top-level types customized Interface.javajet to generate method declaration customized Class.javajet to generate method implementation
17	Customizing Interface.javajet
18	Customizing Class.javajet
19	Implementing destroyHelper(...)
20	Element Destruction Example
21	Element Retrieval Wanted to simplify the process of retrieving named elements from lists Customized JET templates to generate convenient factory methods customized Interface.javajet to generate method declaration customized Class.javajet to generate method implementation
22	Customizing Interface.javajet
23	Customizing Class.javajet
24	Element Retrieval Example
25	Element Validation Wanted a way to perform validation operations on elements Wanted to be able to evaluate different sets of constraints 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
26	Implementing validate(...)
27	Overriding Uml2Switch#defaultCase(EObject)
28	Overriding Uml2Switch#doSwitch(EObject)
29	Overriding Uml2Switch#caseElement(Element)
30	Element Validation - Example