Split domain file

<back

Scenario: Root element A contains element B and element C. Element C is to be saved in a separate domain file.

Solution:

• Create an element CReference.
• CReference contains an element C with containment=false.
• Override method doDefaultElementCreation() in class CReferenceCreateCommand. This method contains the creation of the corresponding element C, similar to the following:

  // create CReference-Object
  EObject cReference = super.doDefaultElementCreation();
  
  // get resource of root element A
  Resource aResource = getElementToEdit().eResource();
  
  // create C object
  C c = ExampleFactory.eINSTANCE.createC();
  
  // add c to cReference
  ((CReference)cReference).setC(c);
  
  // create model file for C
  File cFile = new File(pathToCFile);
  if (!cFile.exists())
     try {
  	cFile.createNewFile();
     } catch (IOException e) {
  	// TODO Auto-generated catch block
  	e.printStackTrace();
     }
  
  // create resource for c
  Resource cResource = aResource.getResourceSet().createResource(
  	URI.createFileURI(cFile.getAbsolutePath()));
  
  // add c to new cResource
  cResource.getContents().add(c);
  
  // save resource; this will also be done by the save command of the generated editor unless you reduce the save command
  try {
     cResource.save(ExampleDiagramEditorUtil.getSaveOptions());
  } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
  }