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Home » Archived » M2M (model-to-model transformation) » [QVTO] Early mapping of metamodel elements
[QVTO] Early mapping of metamodel elements [message #97861] Tue, 20 January 2009 13:22 Go to next message
Hossam Karim is currently offline Hossam KarimFriend
Messages: 26
Registered: July 2009
Junior Member
Hi everyone,
Is there a typical way to map existing model elements in 2 metamodels
before performing the mapping. For example, mapping UML primitive types
to Ecore primitive types and make them available for the transformation
context before starting the mapping.


Thanks,
Hossam Karim
Re: [QVTO] Early mapping of metamodel elements [message #97953 is a reply to message #97861] Wed, 21 January 2009 11:26 Go to previous messageGo to next message
Eclipse UserFriend
Originally posted by: mahdider.students.uni-mainz.de

Hello,

I guess you want to transform a model a which conforms to metamodel A to
a model b which conforms to metamodel B.
I dont't know a fully automated solution to this problem, because there
ar usually semantics involved in metamodels, which cannot be understood
automatically.

What you can do is something like this (example):

/*
Maps a given Java Class to its UML representation.
*/
mapping JAVA::Class::class2Class() : SIMPLE_UML::UmlClass {
init {
result := map singleClassifier(self.name);
}

umlGeneral := self._extends->map class2Class()->asSet();
attributes := self.fields->map field2Attribute()->asSet();
methods := self.methods->map method2Method()->asSet();
}

Now I am not sure if this is exactly what you wanted, but I hope it
helps. :-)

Best Regards,
Mahdi D-Manesh


Hossam Karim schrieb:
> Hi everyone,
> Is there a typical way to map existing model elements in 2 metamodels
> before performing the mapping. For example, mapping UML primitive types
> to Ecore primitive types and make them available for the transformation
> context before starting the mapping.
>
>
> Thanks,
> Hossam Karim
Re: [QVTO] Early mapping of metamodel elements [message #97982 is a reply to message #97861] Wed, 21 January 2009 11:54 Go to previous messageGo to next message
Radomil Dvorak is currently offline Radomil DvorakFriend
Messages: 249
Registered: July 2009
Senior Member
Hi Hossam Karim,

You can do it as the QVT code bellow:

Regards,
/Radek

-- the actual primitive type mapping
mapping UML::PrimitiveType::toEPrimitive() : ECORE::EDataType {
init {
var eTypeName := getEPrimitiveTypeName(self.name);
result := map
ecorePackage().getEClassifier(eTypeName).oclAsType(ECORE::ED ataType);
if(result.oclIsUndefined()) then {
result := map unresolvedPrimitiveType();
} endif;
}
}

-- ecore package access singleton, a mapping executed only once
mapping ecorePackage() : EPackage {
init {
var helperPackage := object EPackage {};
result := helperPackage.eClass().ePackage;
rdb.removeElement(helperPackage);
}
}

-- unresolved type singleton, can be queried to check for unmapped
primitive types
mapping unresolvedPrimitiveType() : EDataType {
name := 'unresolved';
}

helper getEPrimitiveTypeName(in umlTypeName : String) : String {
return switch {
case (umlTypeName = 'Integer') 'EInt';
case (umlTypeName = 'Boolean') 'EBoolean';
case (umlTypeName = 'String') 'EString';
-- add more
else null;
}
}






On Tue, 20 Jan 2009 14:22:52 +0100, Hossam Karim <hossam.karim@gmail.com>
wrote:

> Hi everyone,
> Is there a typical way to map existing model elements in 2 metamodels
> before performing the mapping. For example, mapping UML primitive types
> to Ecore primitive types and make them available for the transformation
> context before starting the mapping.
>
>
> Thanks,
> Hossam Karim
Re: [QVTO] Early mapping of metamodel elements [message #648214 is a reply to message #97982] Tue, 11 January 2011 19:51 Go to previous messageGo to next message
Ken Sayers is currently offline Ken SayersFriend
Messages: 40
Registered: July 2009
Member
Hi Radomil,

I am trying to get access to the types as discussed in this post. I am not successful since the following line does not compile in my QVTO:

helperPackage.eClass().ePackage


I can' t seem to get at the package that holds the classifiers.

Any help would be greatly appreciated.

Ken Sayers
Re: [QVTO] Early mapping of metamodel elements [message #648334 is a reply to message #97861] Wed, 12 January 2011 13:38 Go to previous message
Ken Sayers is currently offline Ken SayersFriend
Messages: 40
Registered: July 2009
Member
Hi All,

Rich G. gave me the answer to this.

add this import to the qvto:

import emf.tools;


Then, use something like:

result := helperPackage.asEObject().eClass().ePackage;


Everything should then work as described by Radomil.

Ken
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