[news.eclipse.modeling.gmf] Re: How to simulate a label of a link when l

[alessanderbotti@xxxxxxxxx (Alessander Botti Benevides)]

Hi Alex, thank you very much for your answer!

I followed the first approach you suggested and was easy to implement, but 
unfortunately I need to get EClass B in the "Properties View" when I click 
on the label, and by this method I get EClass C.

I didn't tried the second solution yet, but it seems to me that it will 
get the same problem, am I right?

I also have tried to create a label of EClass C and then change its 
element to the automatically created element of EClass B by changing 
addFixedChild(EditPart childEditPart) in CEditPart.java

The generated addFixedChild for this example:
protected boolean addFixedChild(EditPart childEditPart) {
	if (childEditPart instanceof OntoUML.diagram.edit.parts.CLabelEditPart) {
		((OntoUML.diagram.edit.parts.CLabelEditPart) childEditPart)
				.setLabel(getPrimaryShape()
						.getFigureCLabelFigure());
		return true;
	}
}

My alteration:
protected boolean addFixedChild(EditPart childEditPart) {
	if (childEditPart instanceof OntoUML.diagram.edit.parts.CLabelEditPart) {
		((OntoUML.diagram.edit.parts.CLabelEditPart) childEditPart)
				.setLabel(getPrimaryShape()
						.getFigureCLabelFigure());
		((View) getModel()).setElement(generatedEClassB);
		// From an EClass C, I can find the generated EClass B instance
		// (generatedEClassB). There is an EReference from EClass C to
		// EClass B that I didn't show in the metamodel, in order to make
		// it more simple...
		return true;
	}
}

I got the following error: 
Caused by: java.lang.ClassCastException: OntoUML.impl.BImpl cannot be cast 
to OntoUML.C

Even if I set the element of childEditPart to the same element that it is 
currently using, by doing the next line of code, I got an error:
((View) getModel()).setElement(resolveSemanticElement());
Caused by: java.lang.IllegalStateException: Cannot modify resource set 
without a write transaction

As you see, I have a poor understanding of how GMF works :(
Is there a way to change the element of the label from C1 (of EClass C) to 
B1 (of EClass B)?
I also have tried to change CEditPart.java in order to create a new View 
for B1 as a label of C1, but having no success. I found no information of 
how to programatically create Views or EditPart instances for elements.
Can you help me?

Thank you for your answer,
Best regards,
Alessander