Question

I’m diving into EMF now, and have encountered the following problem:

I’m trying to remove fields from fieldset with following code:

 FieldElem ff = ds.getContent().getNestedFieldset().get(0).getField().get(0);

            Command remove = new RemoveCommand(editingDomain, nf, 
                           DescPackage.eINSTANCE.getNestedFieldsetElem_Field(), ff);
            editingDomain.getCommandStack().execute(remove);

            ff = ds.getContent().getNestedFieldset().get(0).getField().get(0);

            Command remove2 = RemoveCommand.create(editingDomain, nf, 
                    DescPackage.eINSTANCE.getNestedFieldsetElem_Field(), ff);
            editingDomain.getCommandStack().execute(remove2);

            ff = ds.getContent().getNestedFieldset().get(0).getField().get(0);

            Command remove3 = RemoveCommand.create(editingDomain, ff);
            editingDomain.getCommandStack().execute(remove3);

The first two commands works just fine, but third one not. I’s not even adding to the command stack, and is not removing anything. What am i doing wrong?

UPDATE: As i’ve seen in debugger, execute method return UNEXECUTABLE_COMMAND.

Answer 1

The instruction RemoveCommand.create(editingDomain, ff) can be used only if ff as a container (ie ff.eContainer != null). The eContainer is set automatically by EMF when you add the object to a relation with containment property.

The remove3 command does not work certainly because the getField() relation is not a containment relation.