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Problem declaring constraints on Eclipse Oxygen [message #1816380]

Mon, 28 October 2019 18:19

Gregorio Ospina

Messages: 3
Registered: October 2019

Junior Member

Hello,

I am developing a project in EVL, using Eclipse Oxygen and I've been having issues when declaring constraints for model validations. The problem comes when I declare the fix portion for when the validation fails. Here one has to declare the message and then, the do instruction, however im not sure if it has something to do with the version of Eclipse and the corresponding version of Epsilon, but the execution is not entering the do declaration. The execution succesfully enters the fix, (we know this because the message was shown correctly on the validations tab ) but it doesn't enter the do.
Any help concerning this issue would be of great help, I have attached a picture of the snippet of code.

Attachment: Annotation 2019-10-28 131838.jpg
(Size: 21.27KB, Downloaded 63 times)

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Re: Problem declaring constraints on Eclipse Oxygen [message #1816382 is a reply to message #1816380]

Mon, 28 October 2019 19:25

Dimitris Kolovos

Messages: 2163
Registered: July 2009
Location: York, UK

Senior Member

Hi Gregorio,

Your constraint looks fine to me. Could you please provide a minimal example [1] I can use to reproduce this locally?

Cheers,
Dimitris

[1] https://www.eclipse.org/epsilon/doc/articles/minimal-examples/

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Re: Problem declaring constraints on Eclipse Oxygen [message #1816587 is a reply to message #1816382]

Thu, 31 October 2019 22:24

Gregorio Ospina

Messages: 3
Registered: October 2019

Junior Member

Hey Dmitiris!,
Thank you for your quick response, I was able to understand where i was failing and it was on the underlying knowledge that the do statement executes on command, and not automatically as the constraint fails. I was simply not triggering the do. However, this issue brought up another question which, if you could answer, it would be great. Is there a command or a statement that, unlike do, would execute automatically? Greatly appreciate all your help!

[Updated on: Thu, 31 October 2019 22:25]

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Re: Problem declaring constraints on Eclipse Oxygen [message #1816589 is a reply to message #1816587]

Thu, 31 October 2019 23:55

Dimitris Kolovos

Messages: 2163
Registered: July 2009
Location: York, UK

Senior Member

Hi Grigorio,

You could implement auto-fixing behaviour in the check part of your constraint. e.g.

constraint AutoFix {
  check {
    if (self.problemDetected()) self.fixProblem();
    return true;
  }
}

Cheers,
Dimitris

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Re: Problem declaring constraints on Eclipse Oxygen [message #1816632 is a reply to message #1816589]

Fri, 01 November 2019 21:50

Gregorio Ospina

Messages: 3
Registered: October 2019

Junior Member

Thank you ver much Dimitris, I will look into that and find a solution.

Cheers!

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