Eclipse Modeling Framework in Java

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32 Eclipse Modeling Framework
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topics->symmetricDifference(topicssubtopics-> asSet())"/> </eAnnotations> </eStructuralFeatures>
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Before regeneration, we need to make some changes in the genmodel To allow the OCL plug-in to be added to our generated manifest dependencies, we need to add OCL_ECORE=orgeclipseoclecore to the Model Plug-in Variables property of the genmodel root Also, we need to set the Dynamic Templates property to true and enter the templates path (such as /org eclipsedslmindmap/templates/domain) to the Template Directory property After we generate, we can see the following implementation in our MapImpl class
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private static OCLExpression<EClassifier> rootTopicsDeriveOCL; private static final String OCL_ANNOTATION_SOURCE = "http://wwweclipseorg/2007/OCL"; /** * <!-- begin-user-doc --> * <!-- end-user-doc --> * @generated */ public EList<Topic> getRootTopics() { EStructuralFeature eFeature = MindmapPackageLiteralsMAP__ROOT_TOPICS; if (rootTopicsDeriveOCL == null) { Helper helper = OCL_ENVcreateOCLHelper(); helpersetAttributeContext(MindmapPackageLiteralsMAP, eFeature); EAnnotation ocl = eFeaturegetEAnnotation(OCL_ANNOTATION_SOURCE); String derive = (String) oclgetDetails()get("derive"); try { rootTopicsDeriveOCL = helpercreateQuery(derive); } catch (ParserException e) { throw new UnsupportedOperationException(egetLocalizedMessage()); } } Query<EClassifier, , > query = OCL_ENVcreateQuery(rootTopicsDeriveOCL); @SuppressWarnings("unchecked") Collection<Topic> result = (Collection<Topic>) queryevaluate(this); return new EcoreEListUnmodifiableEList<Topic>(this, eFeature, resultsize(), resulttoArray()); }
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CHAPTER 3 Developing a DSL Abstract Syntax
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The generated code checks to see if the OCLExpression for this derivation has been created already; if not, it initializes it by retrieving the statement from the EAnnotation and its detail with key derive Then the expression is evaluated and the list of Topic elements is returned As mentioned in the article, some improvements could be made to this approach, but it illustrates the usefulness of adding OCL statements to your EMF models It s not hard to imagine how a significant portion of an application could be generated from a model adorned with OCL for invariant constraints, method bodies, and derived features In GMF, we can see how OCL is used to augment the diagram-mapping model to provide for constraints, feature initialization, audit definition, and model metric definition
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Adding constraints and validation is essential in model-driven software development Although you can place validation code within QVT, Xpand templates, and so on, it s most useful to ensure that your model instance is well formed when created, or before moving to a model transformation
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325 Dynamic Instances
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A powerful feature of EMF, and one that is useful to a Toolsmith developing a new DSL, is the capability to create dynamic instances of a model The reflective framework of EMF is leveraged to allow instantiation of a model element without generating code beforehand This can be done from within the default Ecore editor by selecting an element and choosing the Create Dynamic Instance context menu item The instance is stored in an XMI file within the development workspace, so the generation or launch of plug-ins is not required to test a model or, more importantly, to test Xpand templates and QVT transformations under development This is one important distinction when comparing JET to Xpand Dynamic instances are used in the context of our sample projects
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Use dynamic instance models for development as much as possible Xpand templates, QVT transformations, and the OCL console can all work with dynamic instance models and avoid making Toolsmiths generate code and
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33 Developing the Mindmap Domain Model
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invoke a runtime instance to test their work GMF diagrams still require code generation to develop effectively, although generated diagrams are capable of working with dynamic instances
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Figure 3-3 is an example of a dynamic instance model for our mindmap domain model, along with the Properties view It s similar in functionality to the generated EMF editor, although it requires the metamodel to be loaded and reflected upon, as you can see from the loaded mindmapecore resource file
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Figure 3-3 Mindmap dynamic instance model
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You can view any Ecore model using the Sample Reflective Ecore Model Editor, so there s little need to generate the EMF editor plug-in This applies to XMI dynamic instances, such as GMF-based diagrams files where both the domain and notation models are persisted in a single file Simply right-click the file and select Open With Other Internal Editors Sample Reflective Ecore Model Editor
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