Eclipse Community Forums: AM3 » KM3 <-> Ecore probelm

Home » Archived » AM3 » KM3 <-> Ecore probelm(Datatypes lose their instanceClass property)

Fri, 22 October 2010 15:26

Eclipse User

Hi Guys,

In the Ecore mode i have the the following package defined

<ecore:EPackage name="PrimitiveTypes">
<eClassifiers xsi:type="ecore:EDataType" name="Boolean" instanceClassName="java.lang.Boolean"/>
<eClassifiers xsi:type="ecore:EDataType" name="Integer" instanceClassName="java.lang.Integer"/>
<eClassifiers xsi:type="ecore:EDataType" name="String" instanceClassName="java.lang.String"/>
</ecore:EPackage>

When i perform "Extract ecore metamodel to KM3", I get the following:

package PrimitiveTypes {
datatype Boolean;
datatype Integer;
datatype String;
}

Now on the KM3 model, when I perform "Inject KM3 to Ecore metamodel", I get

<ecore:EPackage name="PrimitiveTypes">
<eClassifiers xsi:type="ecore:EDataType" name="Boolean" />
<eClassifiers xsi:type="ecore:EDataType" name="Integer" />
<eClassifiers xsi:type="ecore:EDataType" name="String" />
</ecore:EPackage>

I lose the instanceClassName property for these eClassifier objects.

How do I fix this problem?

All suggestions are welcome.

regards
Arun Smile

Re: KM3 <-> Ecore probelm [message #634970 is a reply to message #634707]

Mon, 25 October 2010 05:48

Eclipse User

Hi Arun,

The behavior that you describe is the expected one when you convert Ecore to KM3 and back again to Ecore.

It is due to the fact that KM3 is not a textual Ecore specific language, It is more generic. It involves that the features which are not needed for KM3, such as the Java corresponding type for a datatype are lost. (It's also because KM3 could be implemented with .net for example and so the instance class type in Java will not work.)

So you need to add the instance class name yourself to the generated Ecore metamodel. (or maybe you can modify the KM3 injector to add this automatically)

I hope this explanation will help you.

Best regards,

Guillaume

Re: KM3 <-> Ecore probelm [message #635008 is a reply to message #634707]

Mon, 25 October 2010 08:09

Eclipse User

There was a mechanism with an external file containing such informations allowing a bijectionnal transformation between KM3 and ecore. There was that datatypes case but also the namespace URI, the prefix and so on...

You have to call that file the same name as the .km3 or the .ecore with the extension ann.

Sample file :

annotate XXXX {
	annotate XXXX with
		nsURI='XXXX',
		nsPrefix='XXXX';

	annotate PrimitiveTypes with
		nsURI='XXXX-PrimitiveTypes',
		nsPrefix='pt';

	annotate "PrimitiveTypes::Boolean" with
		instanceClassName='boolean';

	annotate "PrimitiveTypes::Double" with
		instanceClassName='double';

	annotate "PrimitiveTypes::Integer" with
		instanceClassName='int';

	annotate "PrimitiveTypes::String" with
		instanceClassName='java.lang.String';
}

Re: KM3 <-> Ecore probelm [message #636771 is a reply to message #634707]

Tue, 02 November 2010 13:47

Eclipse User

Thanks guys!!

I will look into it.

regards
Arun

Previous Topic:	Interesting problem
Next Topic:	[AM3] Extending AM3 Metamodel

Goto Forum:

-=] Back to Top [=-

Current Time: Thu Jul 03 14:06:40 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter