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How to implement rules to a connector [message #1751619]

Wed, 11 January 2017 22:56

Lainis 20

Messages: 26
Registered: November 2016

Junior Member

Hi,

I have a case in which a connector can be used for any of my metamodel elements, but once it's used by an element only can be connected to the same element.

Can anyone help me to implement that rule on my project?

Thanks

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Re: How to implement rules to a connector [message #1751661 is a reply to message #1751619]

Thu, 12 January 2017 10:47

Antonio Garcia-Dominguez

Messages: 594
Registered: January 2010
Location: Birmingham, UK

Senior Member

This sounds like a case for GMF live constraints, as you want to disallow the change based on some custom logic - that's one thing that EVL cannot do as far as I know.

It would be a good idea to first try tweaking your .gmfmap, and then automating the changes using a Eugenia polishing transformation:

https://wiki.eclipse.org/Graphical_Modeling_Framework/Concepts/Constraints
https://wiki.eclipse.org/Graphical_Modeling_Framework/Tutorial/Part_2#Link_Constraints

Do you mean that once the connector is linked to an element of type T, it can only be connected to another element of the same type T? In that case, the constraint would be something like "self.oclIsTypeOf(oppositeEnd.eClass)" or something similar, I would guess.

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