[news.eclipse.modeling.gmf] Re: How to make GMF represent recursive obje

[Vlad Ciubotariu <vcciubot@xxxxxxxxxxxx>]

You could allow some flexibility in the model to overcome the gmf
limitations. After bootstrapping the editor you can correct the
containment references by hand.

-vlad

 On Tue, 23 Jan 2007 13:47:57 -0700, Johann wrote:

> Hi,
> 
> I am having a problem representing a recursive object in GMF.
> 
> I have an example emf model with 3 classes: Model, Filesystem, and Folder. 
> The Model is the only root-level object and contains a Filesystem. The 
> Filesystem contains Folders. And a Folder contains other Folders as 
> subfolders.
> 
> I need to set the Model object as the diagram root element. So ideally, I 
> would be able to place a Filesystem object on the diagram, place Folder 
> objects in the Filesystem, and then recursively place Folder objects in 
> other Folders.
> 
> I read that in order to reuse a Node Mapping in the gmfmap file, a Top Node 
> Reference must be defined. So I tried to define a Folder as a Top Node 
> Reference in order to reuse it in a recursive manner. But this does not seem 
> to work because the root Model object does not have an aggregation 
> relationship to Folder. If I try to make the gmfgen file, I get an error 
> saying "Top level node 'Containment Feature' must be available in the 
> diagram 'Domain Element' or its super-class."
> 
> So I've been stuck for a while on how to get the recursive GMF behavior on 
> the Folder object.  I can't reuse the Folder node if I don't define it as a 
> Top Node Reference. And I can't define the Folder node as a Top Node 
> Reference because the diagram root element Model does not have a direct 
> containment on a Folder object. Is this a limitation of GMF or am I doing 
> something completely wrong? Can some one please give me a hint as to how to 
> proceed?
> 
> I've attached the related ecore, genmodel, gmfgraph, gmftool, and gmfmap 
> files for reference.
> 
> Thanks in advance,
> 
> Johann 
> 
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <ecore:EPackage xmi:version="2.0"
>     xmlns:xmi="http://www.omg.org/XMI"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>     xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore"; name="example"
>     nsURI="example" nsPrefix="example">
>   <eClassifiers xsi:type="ecore:EClass" name="filesystem">
>     <eStructuralFeatures xsi:type="ecore:EReference" name="folders" upperBound="-1"
>         eType="#//folder" containment="true"/>
>   </eClassifiers>
>   <eClassifiers xsi:type="ecore:EClass" name="folder">
>     <eStructuralFeatures xsi:type="ecore:EReference" name="subfolders" upperBound="-1"
>         eType="#//folder" containment="true"/>
>   </eClassifiers>
>   <eClassifiers xsi:type="ecore:EClass" name="model">
>     <eStructuralFeatures xsi:type="ecore:EReference" name="filesystem" eType="#//filesystem"
>         containment="true"/>
>   </eClassifiers>
> </ecore:EPackage>
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <genmodel:GenModel xmi:version="2.0"
>     xmlns:xmi="http://www.omg.org/XMI"; xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore";
>     xmlns:genmodel="http://www.eclipse.org/emf/2002/GenModel"; modelDirectory="/recursionExample/src"
>     modelPluginID="recursionExample" modelName="Example" importerID="org.eclipse.emf.importer.ecore">
>   <foreignModel>example.ecore</foreignModel>
>   <genPackages prefix="Example" disposableProviderFactory="true" ecorePackage="example.ecore#/">
>     <genClasses ecoreClass="example.ecore#//filesystem">
>       <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference example.ecore#//filesystem/folders"/>
>     </genClasses>
>     <genClasses ecoreClass="example.ecore#//folder">
>       <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference example.ecore#//folder/subfolders"/>
>     </genClasses>
>     <genClasses ecoreClass="example.ecore#//model">
>       <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference example.ecore#//model/filesystem"/>
>     </genClasses>
>   </genPackages>
> </genmodel:GenModel>
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <gmfgraph:Canvas xmi:version="2.0"
>     xmlns:xmi="http://www.omg.org/XMI";
>     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>     xmlns:gmfgraph="http://www.eclipse.org/gmf/2005/GraphicalDefinition"; name="example">
>   <figures
>       name="Default">
>     <figures
>         xsi:type="gmfgraph:Rectangle"
>         referencingElements="filesystem"
>         name="filesystemFigure"/>
>     <figures
>         xsi:type="gmfgraph:Rectangle"
>         referencingElements="folder"
>         name="folderFigure"/>
>   </figures>
>   <nodes
>       name="filesystem"
>       figure="filesystemFigure"/>
>   <nodes
>       name="folder"
>       figure="folderFigure"/>
> </gmfgraph:Canvas>
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <gmftool:ToolRegistry xmi:version="2.0"
>     xmlns:xmi="http://www.omg.org/XMI";
>     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>     xmlns:gmftool="http://www.eclipse.org/gmf/2005/ToolDefinition";>
>   <palette>
>     <tools
>         xsi:type="gmftool:ToolGroup"
>         title="example">
>       <tools
>           xsi:type="gmftool:CreationTool"
>           title="filesystem"
>           description="Create new filesystem">
>         <smallIcon
>             xsi:type="gmftool:DefaultImage"/>
>         <largeIcon
>             xsi:type="gmftool:DefaultImage"/>
>       </tools>
>       <tools
>           xsi:type="gmftool:CreationTool"
>           title="folder"
>           description="Create new folder">
>         <smallIcon
>             xsi:type="gmftool:DefaultImage"/>
>         <largeIcon
>             xsi:type="gmftool:DefaultImage"/>
>       </tools>
>     </tools>
>   </palette>
> </gmftool:ToolRegistry>
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <gmfmap:Mapping xmi:version="2.0"
>     xmlns:xmi="http://www.omg.org/XMI";
>     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>     xmlns:gmfmap="http://www.eclipse.org/gmf/2005/mappings";
>     xmlns:gmftool="http://www.eclipse.org/gmf/2005/ToolDefinition";>
>   <nodes>
>     <containmentFeature
>         href="example.ecore#//model/filesystem"/>
>     <ownedChild>
>       <domainMetaElement
>           href="example.ecore#//filesystem"/>
>       <tool
>           xsi:type="gmftool:CreationTool"
>           href="example.gmftool#//@palette/@tools.0/@tools.0"/>
>       <diagramNode
>           href="example.gmfgraph#filesystem"/>
>       <children
>           referencedChild="//@nodes.1/@ownedChild">
>         <containmentFeature
>             href="example.ecore#//filesystem/folders"/>
>         <childrenFeature
>             href="example.ecore#//filesystem/folders"/>
>       </children>
>     </ownedChild>
>   </nodes>
>   <nodes>
>     <containmentFeature
>         href="example.ecore#//filesystem/folders"/>
>     <ownedChild>
>       <domainMetaElement
>           href="example.ecore#//folder"/>
>       <tool
>           xsi:type="gmftool:CreationTool"
>           href="example.gmftool#//@palette/@tools.0/@tools.1"/>
>       <diagramNode
>           href="example.gmfgraph#folder"/>
>       <children
>           referencedChild="//@nodes.1/@ownedChild">
>         <containmentFeature
>             href="example.ecore#//folder/subfolders"/>
>         <childrenFeature
>             href="example.ecore#//folder/subfolders"/>
>       </children>
>     </ownedChild>
>   </nodes>
>   <diagram>
>     <diagramCanvas
>         href="example.gmfgraph#example"/>
>     <domainModel
>         href="example.ecore#/"/>
>     <domainMetaElement
>         href="example.ecore#//model"/>
>     <palette
>         href="example.gmftool#//@palette"/>
>   </diagram>
> </gmfmap:Mapping>