Developing a DSL Graphical Notation in Java

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CHAPTER 4 Developing a DSL Graphical Notation
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the Live Validation UI Feedback property mentioned earlier Here we set this to true as well, just to see the result In the Providers category are a number of additional options related to validation and metric priorities and providers The Metric Provider Priority property needs to be set to a value higher than Lowest, so we set it to Medium and regenerate our diagram In the runtime, you ll find Validate and Metrics items in the Diagram menu To test our audits and metrics, create a set of Topic elements with subtopics connecting them in a circle At this point, our layout should be indication enough that cycles are a bad idea, as Figure 4-12 illustrates Ideally, we d add a link constraint to prevent cycles altogether Nevertheless, run the Validate action and observe in the Problems view the warning of a cycle Also notice the warning decorations added to each Topic; each violates the audit
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Figure 4-12
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Rename one of the Topics to a blank value and observe the live validation dialog, shown in Figure 4-13 Invoke our diagram metrics and observe the Mindmap Diagram Metrics view, listing each Topic and providing the metric value in the NOS column, as seen in Figure 4-14 Those with values above the upper limit are displayed in red, and those below the lower limit are displayed in blue In our preferences, we now have a Model Validation category with options for live validation, in case the Practitioner chooses not to have a dialog pop up on each violation, as seen in Figure 4-15 Each constraint is also listed, with information on what it checks and the option to disable each, as seen in Figure 4-16
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43 Developing the Mindmap Diagram
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Figure 4-13
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Figure 4-15
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CHAPTER 4 Developing a DSL Graphical Notation
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Figure 4-16
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Mindmap validation constraint preferences
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Note that audits and metrics defined using GMF are GMF-specific only when they re written against the notation model Otherwise, the generated code can be refactored for use in the domain model without a diagram You will find the Validation Framework quite useful, particularly considering the extensibility provided with its declarative nature You can add other audits and metrics by augmenting the generated pluginxml file, or even from another plug-in This is how our earlier audits and metrics are declared, not including the decorator and marker declarations:
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<extension point="orgeclipseemfvalidationconstraintProviders"> < gmfgen generated="true" > <category id="mindmapaudits" mandatory="false" name="Mindmap Audits"> <![CDATA[A set of mindmap model audits]]> </category> <constraintProvider cache="true"> <package namespaceUri="http://wwweclipseorg/2008/mindmap"/> <constraints categories="mindmapaudits"> <constraint id="cycle" lang="OCL" name="Subtopic Cycle" mode="Batch" severity="WARNING" statusCode="200"> <![CDATA[not self->closure(subtopics)->includes(self)]]> <description><![CDATA[Topics should not have subtopic relationships that form a cycle ]]> </description> <message><![CDATA[A cycle was detected in the subtopics of this Topic]]> </message> <target class="mindmapTopic"/> </constraint>
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43 Developing the Mindmap Diagram
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<constraint id="name" lang="OCL" name="Topic Name" mode="Live" severity="ERROR" statusCode="200"> <![CDATA[selfname <> ]]> <description><![CDATA[All Topic elements require a valid name]]> </description> <message><![CDATA[Topic has no name]]></message> <target class="mindmapTopic"/> </constraint> </constraints> </constraintProvider> </extension> <extension point="orgeclipseemfvalidationconstraintBindings"> < gmfgen generated="true" > <clientContext default="false" id="orgeclipsemindmapdiagramDefaultCtx"> <selector class="orgeclipsemindmapdiagramproviders MindmapValidationProvider$DefaultCtx1"/> </clientContext> <binding context="orgeclipsemindmapdiagramDefaultCtx"> <constraint ref="orgeclipsemindmapdiagramcycle"/> <constraint ref="orgeclipsemindmapdiagramname"/> </binding> </extension> <extension id="MetricContributionItemProvider" name="Metrics" point="orgeclipsegmfruntimecommonuiservicesaction contributionItemProviders"> < gmfgen generated="true" > <contributionItemProvider checkPluginLoaded="true" class="orgeclipsemindmapdiagramprovidersMindmapMetricProvider"> <Priority name="Medium"/> <partContribution id="orgeclipsemindmapdiagrampartMindmapDiagramEditorID"> <partMenuGroup menubarPath="/diagramMenu/" id="validationGroup"/> <partAction id="metricsAction" menubarPath="/diagramMenu/validationGroup"/> </partContribution> </contributionItemProvider> </extension>
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You can find the generated code corresponding to these contributions in the classes MindmapMetricProvider and MindmapValidationProvider; both are in the orgeclipsemindmapdiagramproviders package They are not described in detail here, so take a look at the provided sample code and the documentation on the EMF Validation Framework for more information
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CHAPTER 4 Developing a DSL Graphical Notation
44 Developing a Requirements Diagram
We want a simple diagram that displays requirements so that we can visualize their relationships and dependencies We first develop the diagram to be standalone, and then we integrate it as a tab in the generated EMF editor to illustrate the approach Eventually, we want the requirements editor to be primarily form based