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Accessing attributes to set up pre/post-conditions [message #1834525]

Wed, 11 November 2020 18:18

Thomas Chiang

Messages: 101
Registered: March 2020

Senior Member

Hi,

I have classes in my metamodel with several boolean attributes. This is because based on how they are set in sirius, I may want to change how the object looks or behaves. The first thing that I am doing to figure out how to create the condition for the conditional style is by using the interpreter on the model element to access the attribute and see its return value. At this point however I am unable to find the syntax for Acceleo that would allow me to do so. I figured all I would have to do is click on the attribute and then in the interpreter window have [self.attribute/] to have it return the value I set for the attribute; in this case true or false.

I have not found the tutorials to be very helpful when describing how to do this and pressing 'ctrl+spcbar' hasn't shown me the commands that I would think I need to do it. Any helps?

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Re: Accessing attributes to set up pre/post-conditions [message #1834550 is a reply to message #1834525]

Thu, 12 November 2020 09:35

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

There is nothing very special about Boolean attributes, so it is hard to see why you are having a problem. Since you provide no example of your best failing endeavour, I can only guess that you are trying to use the Java API where EMF wraps Boolean attributes in an isXXX() getter rather than the much simpler direct XXX model feature access.

Regards

Ed Willink

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Re: Accessing attributes to set up pre/post-conditions [message #1834551 is a reply to message #1834525]

Thu, 12 November 2020 10:03

Florian Barbin

Messages: 270
Registered: August 2010

Senior Member

Hi,

If I understand, you want to define a conditional style according to an attribute boolean value ?
Generally, I would suggest you to use AQL expressions. The documentation about queries in Sirius: https://www.eclipse.org/sirius/doc/specifier/general/Writing_Queries.html.
The detailed documentation for AQL is available here: https://www.eclipse.org/acceleo/documentation/aql.html
But for simple cases like get an attribute (or reference) value you can use the feature interpreter. Your conditional expression will look like "feature:yourBooleanAttributeName".
You can have a look on the Ecore tools modeler based on Sirius if you want an advanced example: https://github.com/eclipse/ecoretools. The odesign is defined in org.eclipse.emf.ecoretools.design/description/

Regards,

Florian

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Re: Accessing attributes to set up pre/post-conditions [message #1834570 is a reply to message #1834551]

Thu, 12 November 2020 15:02

Thomas Chiang

Messages: 101
Registered: March 2020

Senior Member

I was overthinking things and didn't realize that I could simply use feature:booleanAttribute. I thought I needed to do some query in AQL thanks!

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