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[Acceleo] how to get the ID of an EObject [message #761698]

Tue, 06 December 2011 22:48

pessi mistisch

Messages: 6
Registered: October 2011

Junior Member

I need the id of an Element (the one that I can see in the XML serialization of a model).

Basically I tried the following approach: (without getting errors but also without getting the ID):

[module generate('myMetamodel') /]
[query public getID(aElement : Element) : String = invoke('org.eclipse.emf.ecore.util.EcoreUtil','getID(org.eclipse.emf.ecore.EObject)', Sequence{aElement})/]

[template public MyTemplate(aSpecialElement: SpecialElement)]
[aSpecialElement.getID() /]
[aSpecialElement.myAttributeName /]
[/template]

(where "aSpecialElement" is a specialization of "aElement")

The assigned "MyAttributeName" appears, so I think there is no problem with the remainder of my code.

What is my fault or is there an easier way that I have overseen?

Any help is greatly appreciated!
Thanks.

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Re: [Acceleo] how to get the ID of an EObject [message #761882 is a reply to message #761698]

Wed, 07 December 2011 08:17

Laurent Goubet

Messages: 1902
Registered: July 2009

Senior Member

Hi,

There are two kind of "ID" for an EObject : the ID attribute, which can be retrieved with EcoreUtil.getID and corresponds to an attribute you've set as being the identifier of your object in the genmodel; or the XMI ID which appears in the serialized model as

xmi:id="..."

.

I believe what you seek is the second form, yet you're trying to access it through the first's accessor. Neither Acceleo nor EMF provide easy access to the XMI ID, you need a Java method that does the following :

public String getXMIID(EObject eObject) {
    if (eObject.eResource() instanceof XMIResource) {
        return ((XMIResource)eObject.eResource()).getID(eObject);
    }
    return "";
}

Laurent Goubet
Obeo

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