Developing a Diagram in Java

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108 Developing a Diagram
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We know from Section 106, Element Creation that the semantic elements are created first when creating elements in our diagram And, since our subtopic link represents a subtopics relationship element of our Topic class, we should consider adding a SemanticEditPolicy to our TopicEditPart in order to create the appropriate CreateRelationshipCommand for the subtopic link If we were using GEF alone, we would use the installEditPolicy() method to do this; in GMF, we could use createDefaultEditPolicies() However, we have an editpolicyProvider extension-point and Service in GMF that we can configure for this purpose, without requiring us to modify our TopicEditPart Below is the contribution to the extension-point we will add to our pluginxml file
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<extension point="orgeclipsegmfruntimediagramuieditpolicyProviders"> <editpolicyProvider class= "orgeclipsemindmapdiagramprovidersMindmapEditPolicyProvider"> <Priority name="Lowest"/> </editpolicyProvider> </extension>
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Our MindmapEditPolicyProvider class follows We override the createEditPolicies() method to reinstall the new TopicSemanticEdit Policy on our TopicEditPart We use the provides() method that declares this offering
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public class MindmapEditPolicyProvider extends AbstractProvider implements IEditPolicyProvider { public void createEditPolicies(EditPart editPart) { if (editPart instanceof TopicEditPart) { editPartinstallEditPolicy(EditPolicyRolesSEMANTIC_ROLE, new TopicSemanticEditPolicy()); } } public boolean provides(IOperation operation) { if (operation instanceof CreateEditPoliciesOperation) { CreateEditPoliciesOperation op = (CreateEditPoliciesOperation)operation; if (opgetEditPart() instanceof TopicEditPart) { return true; } } return false; } }
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CHAPTER 10 Graphical Modeling Framework Runtime
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For the implementation of the TopicSemanticEditPolicy class, we need only override the getSemanticCommand() method and check for an incoming CreateRelationshipRequest, returning a properly configured SubtopicCreateCommand wrapped in an ICommandProxy We compare the element type of the request against our Subtopic element type, along with the values for source and target to return the proper command Looking at our SubtopicCreateCommand, we find the logic that determines whether the returned command is executable
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public class SubtopicCreateCommand extends EditElementCommand { private final EObject source; private final EObject target; public SubtopicCreateCommand(CreateRelationshipRequest request, EObject source, EObject target) { super(requestgetLabel(), null, request); thissource = source; thistarget = target; } public boolean canExecute() { if (source == null && target == null) { return false; } if (source != null && !(source instanceof Topic)) { return false; } if (target != null && !(target instanceof Topic)) { return false; } if (target == source) { return false; } return true; } protected CommandResult doExecuteWithResult( IProgressMonitor monitor, IAdaptable info) throws ExecutionException { if (!canExecute()) { throw new ExecutionException( "Invalid arguments in create link command"); } if (getSource() != null && getTarget() != null) { getSource()getSubtopics()add(getTarget()); } return CommandResultnewOKCommandResult(); } protected Topic getSource() {
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108 Developing a Diagram
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return (Topic) source; } protected Topic getTarget() { return (Topic) target; } }
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From canExecute(), we see that if the request source and target do not conform to the appropriate type (Topic, in this case), false is returned A false is also returned if the target Topic is the same as the source Topic because it doesn t make sense for a Topic to be a subtopic of itself Other validation could take place here, such as ensuring that the target is not already found in the source s subtopics reference The command extends the provided EditElementCommand, and we see how the target is added to the subtopics reference in doExecuteWithResult() Now that we understand how the underlying semantic command is provided and validated against the model, it s time to look at the View and EditPart aspects of our Subtopic link Our MindmapViewProvider must be augmented to deal with edge views We can add another Map for diagram edges and initialize it with the provided ConnectionViewFactory class, keyed to our Subtopic semantic hint, as shown here:
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public class MindmapViewProvider extends AbstractViewProvider { private final Map<String, Class< >> edgeMap = new HashMap<String, Class< >>(); { edgeMapput("Subtopic", ConnectionViewFactoryclass); } // @Override protected Class getEdgeViewClass(IAdaptable semanticAdapter, View containerView, String semanticHint) { Class clazz = null; if (semanticHint != null && semanticHintlength() > 0) { clazz = edgeMapget(semanticHint); } return clazz; } }
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