[news.eclipse.tools.emf] Re: EContentAdapter for all new Model instances

[Ed Merks <Ed.Merks@xxxxxxxxx>]

Hauke,

Comments below.

Hauke Fuhrmann wrote:
> Ed Merks schrieb:
> > > Now I want to observe *any* new model instance of my metamodel. Is 
> > > there a way to automatically add such adapter to the model at 
> > > creation or loading? Where is the best point to hook that in?
> > You can add an EContentAdapter to a ResourceSet and then it will be 
> > added to all objects contained by that resource set.
>
> But I want to add it also automatically to all new resources created 
> for a specific metamodel.
Resources aren't necessarily created specific to a model and as I 
suggested you could do it in your resource factory.
> > I'm tempted to ask what you're trying to accomplish though.  For 
> > example, the XSD model is "self adapting" because it uses 
> > notifications internally to keep the DOM in sync with the model, but 
> > it doesn't do that by attaching adapters...
>
> It sounds something like exactly that.
>
> I have a metamodel with a String attribute in some object and a lot of 
> complicated child objects. The String is a convenience represenation 
> of those child objects and I have a String parser and serializer that 
> is able to convert the String into the child object set and vice versa.
> So what I wanna do is whenever somebody changes such a String, it 
> should trigger my parser and vice versa if any of the child object 
> have changed, the serializer should update the String.
So you might be better to override eNotificationRequired to be true, and 
specialize eNotify to not only forward the notifications to the adapters 
list (calling super) but also do some processing internal to the model.
> Additionally the serialization is dependent on some referenced objects 
> somewhere else so I have also to monitor them.
>
> So how can such "self adapting" be done. Sounds like something I could 
> also use.
 @Override
 public boolean eNotificationRequired()
 {
   return true;
 }

 @Override
 public void eNotify(Notification msg)
 {
   // Internal model processing...
   super.eNotify(msg);
 }
> Cheers,
> Hauke