Developing a DSL Graphical Notation in Java

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CHAPTER 4 Developing a DSL Graphical Notation
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Table 4-31 Element Stack Layout Polygon
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Diamond Figure Definition (continued) Property Value
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Name X, Y X, Y X, Y X, Y Name Affixed Parent Side Resize Constraint
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Diamond 5, 0 0, 5 5, 10 10, 5 Scenario NSEW NONE
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Template Point Template Point Template Point Template Point Node
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Default Size Facet Dimension Dx, Dy 10, 10
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In our requirementsgmftool model, we add a new creation tool in the Nodes group for the Scenario element by copying another tool and pasting into the group In the mapping model, to select our scenario diagram canvas for the Related Diagrams reference, we need to use Load Resource again and load scenariogmfmap into the resource set Next, we create a new Child Reference to our Requirement Node Mapping and set its Containment Feature property to our new scenario:Process reference The child Node Mapping settings are found in Figure 4-39 Unfortunately, when selecting the Related Diagrams property, a dialog appears with two Canvas Mapping entries The scenario canvas should be the second one on the list, but we can do our usual verification by opening the model in a text editor We re ready to re-create our requirementsgmfgen model using the normal sequence, but don t generate the diagram code just yet Open the generator model and navigate to the Gen Child Side Affixed Node ProcessEditPart element, where you can see the generated Open Diagram Behaviour element The Diagram Kind property of the generated Open Diagram Behaviour element defaults to FIXME put GenEditorGeneratormodelID value here Similarly, the Editor ID property defaults to FIXME put GenEditorViewid value here We replace these with scenario and orgeclipse scenariodiagrampartScenarioDiagramEditorID, respectively, as shown in Figure 4-40 Fortunately, these properties are preserved when updating
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45 Developing the Scenario Diagram
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the gmfgen model Note that if we planned to have multiple open diagram policies, we d rename the default OpenDiagramEditPolicy to something such as OpenScenarioDiagramEditPolicy, to distinguish between them
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Figure 4-39
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Scenario-related diagram mapping
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When working with diagram Styles, be sure to create new elements when testing their behavior Existing View elements were initialized and persisted before new Style code was added to the ViewFactory
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Figure 4-40
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Scenario open diagram edit policy
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CHAPTER 4 Developing a DSL Graphical Notation
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The string 'scenario' matches the semanticHints attribute of the Scenario diagram s provider declaration, as shown next When the ViewService is consulted to create the new diagram for the Process element reference, it uses this hint to create the diagram, as discussed in Section 1041, View Service
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<extension point="orgeclipsegmfruntimediagramcoreviewProviders"> < gmfgen generated="true" > <viewProvider class="orgeclipsescenariodiagramprovidersScenarioViewProvider"> <Priority name="Lowest"/> <context viewClass="orgeclipsegmfruntimenotationDiagram" semanticHints="scenario"/> <context viewClass="orgeclipsegmfruntimenotationNode" semanticHints=""/> <context viewClass="orgeclipsegmfruntimenotationEdge" semanticHints=""/> </viewProvider> </extension>
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When testing behavior that initiates on double-click, such as an open diagram edit policy, be sure that the root figure is selected If you re not sure, use the mouse to drag around the element to select it and then doubleclick
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In the RequirementsEditor class, we need to add an adapter factory for our Scenario integration The following line added to initializeEditingDomain() does the trick:
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adapterFactoryaddAdapterFactory(new ScenarioItemProviderAdapterFactory());
We now can regenerate our diagram code and launch Add a new Scenario element to a Requirement in a sample diagram and double-click it A new diagram should open in an adjacent editor tab, as shown in Figure 4-41
45 Developing the Scenario Diagram
Figure 4-41
Requirements diagram partition
At the moment, we re persisting a process model instance within our requirements model instance, contained within the associated Requirement instance We could set the requirementsgenmodel to use Containment Proxies, which would let us specify a new resource (file) for persisting new Process instances This would also let us store these models independently and even initialize a new standalone scenario diagram for each process This doesn t work out of the box, but you can implement it using custom code
457 Database Persistence
As mentioned in the overview of Modeling project components, we can persist models to other than a local file Two components within the EMFT project allow for database persistence of EMF models: Teneo and Connected Data Objects (CDO) In this section, we use Teneo to persist our scenario diagram and domain model instance to a Derby database using Hibernate The process for persisting both EMF models and GMF diagrams is presented in tutorials linked from the Teneo Web site, with the latter inspiring the content here