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[CDO] Dealing with extended meta model [message #1006478]

Thu, 31 January 2013 12:52

Christophe Bouhier

Messages: 937
Registered: July 2009

Senior Member

EMF since some time supports code generation of derived features, invariants etc...
In my original model, I defined these things, starting from .XSD. Here is an example:


<xs:attribute ecore:derived="true" ecore:transient="true"
ecore:volatile="true" name="Count" type="xs:int">
<xs:annotation>
<xs:documentation>OCL derived feature: Count all equipments.
</xs:documentation>
<xs:appinfo ecore:key="derivation"
source="http://www.eclipse.org/emf/2002/Ecore/OCL">self.equipments->size()
</xs:appinfo>
</xs:annotation>
</xs:attribute>

Now I wonder, how does CDO deal with this? I see in the generated Class for this attribute delegates
to eGet(). Does the eStore pass it on to the OCL Query handler? How is this supposed to work?

thank you
Christophe

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Re: [CDO] Dealing with extended meta model [message #1006497 is a reply to message #1006478]

Thu, 31 January 2013 14:00

Eike Stepper

Messages: 6682
Registered: July 2009

Senior Member

Am 31.01.2013 13:52, schrieb Christophe Bouhier:
> EMF since some time supports code generation of derived features, invariants etc... In my original model, I defined
> these things, starting from .XSD. Here is an example:
> 
> <xs:attribute ecore:derived="true" ecore:transient="true"
> ecore:volatile="true" name="Count" type="xs:int">
> <xs:annotation>
> <xs:documentation>OCL derived feature: Count all equipments.
> </xs:documentation>
> <xs:appinfo ecore:key="derivation"
> source="http://www.eclipse.org/emf/2002/Ecore/OCL">self.equipments->size()
> </xs:appinfo>
> </xs:annotation>
> </xs:attribute>
>
>
> Now I wonder, how does CDO deal with this? I see in the generated Class for this attribute delegates
> to eGet(). Does the eStore pass it on to the OCL Query handler? How is this supposed to work?
I've never used this functionality myself, but I suspect that annotated OCL expressions get evaluated on the client side.

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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