[news.eclipse.modeling.gmf] Binary assosiation between one class

[Klaus Simon <busta_k@xxxxxx>]

Hello,

i need a binary association between one class. Like a association 
"Neighbor"  between two objects of one class "Element". The EOpposite of 
"Neighbor" i would be "Neighbor", too.

As i read in the emf-newsgroup, this is not possible in emf, so it isn't 
really possible in gmf either.

As a workaround, i created a simple association "Neighbor", from 
"Element" to itself. In the ElementNeighbourCreateCommand.java i changed 
the method doExecuteWithResult(...) from

doExecuteWithResult(...){
...	
	if (getSource() != null && getTarget() != null) {
		getSource().getNeighbor().add(getTarget());
	}
...
}

to
doExecuteWithResult(...){
...	
	if (getSource() != null && getTarget() != null) {
		getSource().getNeighbor().add(getTarget());
		getTarget().getNeighbor().add(getSource());
	}
...
}

(I adjusted the ElementNeighbourReorientCommand.java the same way also.)

First question: this is working, but is it also the right gmf-way to do it?

Second question: In the diagram there are shown two neighbour-links 
between the Elements, which is correct, because i create two links. But 
since these two links are actually one binary link, i would to have only 
one link displayed. Is there a (elegant) way, to prevent the second link 
from being displayed?


Thanks a lot in advance and best regards,
Klaus