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Modified parameter 'self' is input only [message #1715287]

Fri, 20 November 2015 19:16

Eclipse User

Hi Guys

I am exercising with qvto and not sure why qvto editor reports "Modified parameter 'self' is input only" for
self.eAnnotations += object ECORE::EAnnotation{ source :=annsource;};
in
helper ECORE::EModelElement::getOrCreateEAnnForSource(in annsource: String): EAnnotation {
var eann: ECORE::EAnnotation := self.getEAnnotation(annsource);
if(eann=null){
self.eAnnotations += object ECORE::EAnnotation{ source :=annsource;};
};
return eann;
}
My expectation was that it is possible to modify self content in helper (...but not in query?). Am I missing something?

Thanks
Michael

[Updated on: Sat, 21 November 2015 13:04] by Moderator

Re: Modified parameter 'self' is input only [message #1715422 is a reply to message #1715287]

Mon, 23 November 2015 08:44

Eclipse User

Hi

The 'self' parameter is read-only by default. An explicit 'inout' declaration should do the trick, but Eclipse QVTo seems to support that only for mappings, not for helpers.

helper inout ECORE::EModelElement::getOrCreateEAnnForSource(in annsource: String): EAnnotation {...}

Instead, try converting your helper to a mapping, or pass the EModelElement as a trailing parameter.

Regards
Christopher

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