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| Re: How to be notified of an EList change [message #484459 is a reply to message #484452] |
Mon, 07 September 2009 14:49  |
 Ed Merks
Messages: 33142
Registered: July 2009 |
Senior Member |
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Cheng,
Comments below.
CHENG wrote:
> Hi all,
>
> I'm currently having some problems trying to catch an EList change
> (add/remove).
>
> I have designed an ecore diagram on which an EClass "A" can contains
> an array of an EClass "B" (let's call this array "arrayOfB"). The
> generated model code automatically declare the array as follow
> "EList<B> arrayOfB = null;"
> and generate an array accessor "public EList<B> getarrayOfB()".
>
> Now from a class user point of view, the user will instantiate a new
> "A" and will add a new "B" to the array:
> A newA = Factory.createA();
> B newB = Factory.createB();
> newA.getarrayOfB().add(newB);
>
>
> In this case, I need to execute some code juste before the newB is
> added to the array. Is there a way to be notified of an EList
> add/remove event?
An Adapter on an A instance will be notified *after *the value is added
to the list. You can specialize the list itself to override methods
like didChange, didAdd and so on to do things as the value is being added.
>
> Thanks in advance.
>
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Cheng,<br>
<br>
Comments below.<br>
<br>
CHENG wrote:
<blockquote
cite="mid:59270c8267a5ab4b6ebb08e556ebc26b$1@www.eclipse.org"
type="cite">Hi all,
<br>
<br>
I'm currently having some problems trying to catch an EList change
(add/remove).
<br>
<br>
I have designed an ecore diagram on which an EClass "A" can contains an
array of an EClass "B" (let's call this array "arrayOfB"). The
generated model code automatically declare the array as follow
"EList<B> arrayOfB = null;"
<br>
and generate an array accessor "public EList<B> getarrayOfB()".
<br>
<br>
Now from a class user point of view, the user will instantiate a new
"A" and will add a new "B" to the array:
<br>
A newA = Factory.createA();
<br>
B newB = Factory.createB();
<br>
newA.getarrayOfB().add(newB);
<br>
<br>
<br>
In this case, I need to execute some code juste before the newB is
added to the array. Is there a way to be notified of an EList
add/remove event?
<br>
</blockquote>
An Adapter on an A instance will be notified <b>after </b>the value
is added to the list.
Ed Merks
Professional Support: https://www.macromodeling.com/
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