Tooling Definition Wizard in Java

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Tooling Definition Wizard
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With the tooling model open in its editor, you can see that the wizard created a single tool group and creation tools for each of these We might want to create separate groups for links and nodes, but for now we ll leave the model as is
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433 Mindmap Mapping Model
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Once again, we use a GMF wizard to get us started Right-click on the diagrams folder and select New Other Domain-Specific Language Diagram Definition to begin creating a GMF mapping model Note that you can begin a diagram definition directly from this wizard because it enables you to create a new palette model and select an existing graphical definition model Provide the name mindmapgmfmap and select Map as the class to represent the canvas Accept the default mindmapgmftool model and select our mindmap gmfgraph model on the next page On the Mapping page, modify the wizard defaults and move Relationship to the Links list, leaving just Topic in the Node list Remove all but subtopics and Relationship from the Links list, as shown in Figure 4-5
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Figure 4-5
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Mapping Model Wizard
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Notice that for each selection of Node and Link, you can change the wizard s mapping A limitation on Nodes exists: The dialog that displays with Change shows only the mapping for the top-level node, not the node mapping or labels Try this now with the Relationship link, setting the Source Feature to the
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43 Developing the Mindmap Diagram
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source reference and the Target Feature to the target feature Also ensure that the proper Tool and Diagram Link are selected Upon Finish, browse the mapping model in the editor Check each property to verify that all are correct, and use the Validate action from the context menu Regarding our two types of links, notice that they illustrate the two most common methods of providing link mappings for a diagram The subtopics reference maps to a link that shows the relationship between Topic elements In this case, we need to indicate only the Target Feature in our link mapping, leaving the other properties blank The relationship link shows how to map a link to a domain model class in this case, our Relationship class To complete the mapping definition, we need to specify the Element and its Containment Feature, Source Feature, and Target Feature for the link Let s go through the mapping model in some detail, because it often causes confusion Beginning with the Canvas Mapping element, you can see that the Map domain Element will be represented by the mindmap Diagram Canvas from our mindmapgmfgraph model Similarly, the diagram canvas will have a Palette, represented by our mindmapgmftool model s mindmapPalette element Note that the Menu and Toolbar Contributions properties are blank because GMF has not yet implemented them, as seen in Table 4-1
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Table 4-1 Element Mapping Canvas Domain Model Element Palette Diagram Canvas Mindmap Map Palette mindmapPalette Canvas mindmap Mindmap Canvas Mapping Property Value
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For our Topic node, we see in the properties of the Top Node Reference that new instances of Topic elements are to be maintained in the elements containment reference of our Map class, as shown in Table 4-2 The Children Feature property is left blank because we retrieve and store our Topic elements directly from the elements containment feature
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Table 4-2 Element Mapping
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Mindmap Topic Mapping Property Value
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Top Node Reference Node Mapping
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Containment Feature Element Diagram Node Tool
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Mapelements : MapElement Topic -> MapElement Node Topic (TopicFigure) Creation Tool Topic Diagram Label TopicName MapElementname : EString
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Feature Label Mapping
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Diagram Label Features
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Below the Top Node Reference mapping is the Node Mapping for the Topic class itself The Topic class, which is a subclass of MapElement, is used for the node s Element The Topic node from our mindmapgmfgraph is used for the Diagram Node, which we see references the TopicFigure from the Figure Gallery Finally, the Node requires a Tool, so we select the Topic Creation Tool from our palette defined in our mindmapgmftool model Note that the Appearance Style and Context Menu properties are left blank because GMF has not yet implemented them The Topic displays its name using a label, which is defined in the child Feature Label Mapping element The Diagram Label property is selected to the TopicName label in our graphical definition and displays the value of the Topic s name:EString attribute Both the Edit and View Method properties are set to the default MESSAGE_FORMAT value, meaning that the Java MessageFormat class provides the underlying implementation for parsing, editing, and displaying our label In the case of our Topic label, a single attribute is displayed, with no other characters required With the node mapping complete, let s look at the subtopics link mapping In our domain model, Topics are related to other sub Topics using the subtopics reference Simple references such as this are straightforward to map in GMF because we only need to set our Target Feature property to this reference in our domain model, as seen in Table 4-3 Our next link mapping discusses the remaining Domain meta information properties The Diagram Link and Tool properties are set as you would expect, to the TopicSubtopics Connection from our graphical definition, and to the TopicSubtopics Creation Tool in our tooling definition, respectively