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How to compare model attribute that contains an enum with an enum constant? [message #983886]

Wed, 14 November 2012 03:15

Andreas Brieg
Messages: 48
Registered: November 2012

Member

I want to create a transformation on the MoDisco Java model, but I have problems when it comes to comparing an attribute value to a enum constant. The relevant part of the transformation at the moment looks like this:

-- @atlcompiler atl2010
-- @nsURI Java=http://www.eclipse.org/MoDisco/Java/0.2.incubation/java

module RefactorBeanValidationForParameterChecking;
create outputJava: Java refining javaInput: Java;

helper context Java!InfixExpression def: isEqualsComparison(): Boolean =
	self.operator.toString() = '==';

According to the ATL user guide I should be able to use

self.operator = #EQUALS

instead of the toString() workaround. However this isn't working. Am I missing something?

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Re: How to compare model attribute that contains an enum with an enum constant? [message #984015 is a reply to message #983886]

Wed, 14 November 2012 05:33

Hugo Bruneliere
Messages: 461
Registered: July 2009

Senior Member

Hello,

EQUALS is the value of the "name" attribute of the EEnumLiteral you are handling.
The value of its "literal" attribute is "==" (cf. the MoDisco Java metamodel registered in the EMF registry, you can open it with the MoDisco Model Browser for instance).
So, is the following line working?

self.operator = #"=="

The "" are to escape the = symbol which is part of the ATL language.

Hugo

------------------------------------------
Hugo Bruneliere - R&D Engineer
AtlanMod research team (Inria, EMN & LINA)
Ecole des Mines de Nantes
Nantes - France
------------------------------------------

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Re: How to compare model attribute that contains an enum with an enum constant? [message #984045 is a reply to message #984015]

Wed, 14 November 2012 06:01

Andreas Brieg
Messages: 48
Registered: November 2012

Member

Thanks very much, that works.

Maybe it would be good to mention the escaping in the user guide and also that the value after # refers to the literal value of the enum and not to the name.

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