| Creating diagram without XML Resource [message #164768] |
Fri, 07 December 2007 15:42 |
Eclipse User |
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Originally posted by: martin.tomaga.gmx.net
Hi all
I am having question about how to load and create diagrams from object model. As a datastore I would like to use DB, not XML files. I would like to load data from DB, then create domain objects and
then from this objets create diagram. I am havimg problem with the last step: creating diagram from domain objects. I am trying to overwrite method setDocumentContent in the class
ProcessDesignerDocumentProvider with code:
protected void setDocumentContent(IDocument document, IEditorInput element) throws CoreException {
ProcessDiagram processDiagram = ObjectFactory.eINSTANCE.createProcessDiagram();
Diagram diagram = ViewService.createDiagram(processDiagram, ProcessDiagramEditPart.MODEL_ID, ProcessDesignerDiagramEditorPlugin.DIAGRAM_PREFERENCES_HINT) ;
diagram.setName("myNew.object_diagram");
diagram.setElement(processDiagram);
document.setContent(diagram);
// setting other objects
}
But I always get exception
java.lang.NullPointerException
at org.eclipse.gmf.runtime.diagram.core.util.ViewUtil.getIdStr( ViewUtil.java:642)
at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.getWo rkspaceViewerPreferenceStore(DiagramEditor.java:1271)
at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.confi gureGraphicalViewer(DiagramEditor.java:827)
at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.creat eGraphicalViewer(DiagramEditor.java:793)
...
Problem is in the class ViewUtil in the line
String id = ((XMLResource) view.eResource()).getID(view);
where method view.eResource() always returns null. Moreover, if method view.eResource() will return not null value, the next operation is casting to XMLResourse. But my input is not XML file.
I found a few words about how to load diagrams on GMF wiki
http://wiki.eclipse.org/index.php/GMF_Archived_Newsgroup_Q&a mp;A#How_can_I_use_GMF_diagrams_without_using_files.3F
But this answer does not solve my problem :-(
Does anybody know how to solve this problem? Or is there some better solution how to create diagrams from domain objects?
Thanks
Martin
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