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Add EContentAdapter [message #538518]

Mon, 07 June 2010 19:58

No real name

Messages: 18
Registered: October 2009
Location: denmark

Junior Member

Hi,

Maybe this is a dumb question.

I have a model which has two classes, A and B.
A has a reference to B. I would like A instance listens to the corresponding referenced B instance. Based on B's specific changes, the A instance will modify it's attributes.

I would like to ask where should I add my EContentAdapter in the generated code. I have tried to add the adapter in the setB method. But this method is called only if the reference is set.

Thank you for your advices!

Ayia

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Re: Add EContentAdapter [message #538561 is a reply to message #538518]

Tue, 08 June 2010 00:18

Ed Merks

Messages: 33216
Registered: July 2009

Senior Member

Ayia,

Comments below.

wg@mci.sdu.dk wrote:
> Hi,
>
> Maybe this is a dumb question.
> I have a model which has two classes, A and B.
> A has a reference to B. I would like A instance listens to the
> corresponding referenced B instance. Based on B's specific changes,
> the A instance will modify it's attributes.
>
> I would like to ask where should I add my EContentAdapter in the
> generated code. I have tried to add the adapter in the setB method.
> But this method is called only if the reference is set.
If the reference isn't set, is there anything listen to?

If you look in EContentAdapter and ECrossReferenceAdapter you see that
they generally hook things up based on notification, i.e., you might
listen to A to see when it's B(s) change and use that to add and remove
adapters.
> Thank you for your advices!
>
> Ayia

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Add EContentAdapter [message #538654 is a reply to message #538561]

Tue, 08 June 2010 10:54

No real name

Messages: 18
Registered: October 2009
Location: denmark

Junior Member

Thank you Ed, your reply enlightened me.

I stuck with this problem in a scenario like:
If I have created a model containing A and B instances, In one A instance I have set the reference to certain B instance (during set I was able to add adapter), and then closed the editor with a serialized model, next time when I open the editor with the model again, I would like A directly response to possible changes of the referenced B (which I failed to achieve).

I think what I should do is adding an EContentaAdapter in the createModel() method inside the generated editor plugin, so that interested modifications will be notified. Is this approach correct or some better solutions are available.

Thank you very much for your reply!
Ayia

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Re: Add EContentAdapter [message #538771 is a reply to message #538654]

Tue, 08 June 2010 15:09

Ed Merks

Messages: 33216
Registered: July 2009

Senior Member

Ayia,

Such a content adapter can definitely get notifications for all objects
in the entire resource set so you could definitely find out about all
changes that happen to all B instances. I'm not sure if given a B, you
immediately know which A instance(s) refer to it, i.e., if it has an
opposite, or is a containment reference and hence EObject.eContainer is
an implicit opposite. You might want to use an ECrossReferenceAdapter
which actually helps to track inverses references for references that
don't have opposites..

wg@mci.sdu.dk wrote:
> Thank you Ed, your reply enlightened me.
>
> I stuck with this problem in a scenario like: If I have created a
> model containing A and B instances, In one A instance I have set the
> reference to certain B instance (during set I was able to add
> adapter), and then closed the editor with a serialized model, next
> time when I open the editor with the model again, I would like A
> directly response to possible changes of the referenced B (which I
> failed to achieve).
>
> I think what I should do is adding an EContentaAdapter in the
> createModel() method inside the generated editor plugin, so that
> interested modifications will be notified. Is this approach correct or
> some better solutions are available.
>
> Thank you very much for your reply!
> Ayia

Ed Merks
Professional Support: https://www.macromodeling.com/

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