[gme-users] OCL constraint question

[Jared Crace]

Larry,

Thanks for your help.  That was the problem.

Jared

From: gme-users-bounces at list.isis.vanderbilt.edu [mailto:gme-users-bounces at list.isis.vanderbilt.edu] On Behalf Of Larry Howard
Sent: Friday, September 25, 2009 1:42 PM
To: A list for GME users to share thoughts and discuss bugs and fixes.
Subject: Re: [gme-users] OCL constraint question

Jared,

Seems like a trick question.

let jira=project.allInstancesOf(StartTestCase) in jira.isUnique( i:StartTestCase | i.name<http://i.name>)

So perhaps the matter has to do with enforcement (or "checking".)  You can use the "on change property" event to check the constraint whenever a "StartTestCase" atom is renamed.  One consequence of this choice is that each atom must be given a unique name before the creation of the next, since all are created with the same name ("StartTestCase").

If you want to force aborting a renaming operation on the constraint violation, you can change the constraint's Priority attribute to 1.

Hope that helps.

Regards,
lph
--
Larry Howard, Sr. Research Scientist
Institute for Software Integrated Systems, Vanderbilt University



On Sep 25, 2009, at 1:20 PM, Jared Crace wrote:


Hi All,

I have created an atom named "StartTestCase" that has an attribute called "JiraItem".  I have written a constraint to verify that all JiraItems must have a unique name.  The constraint I wrote was:

let jira=project.allInstancesOf(StartTestCase) in jira.isUnique( i:StartTestCase | i.JiraItem)

The constraint works just fine.  But I would also like to write another constraint that makes sure the user renames the "StartTestCase" atom to a unique name.  Could you please let me know how to accomplish this?

Thanks

Jared Crace
Pitney Bowes
Software Engineer
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