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Global Variables in OCL [message #1060061]

Wed, 22 May 2013 18:36

ModelGeek Mising name

Messages: 550
Registered: June 2011

Senior Member

I would like to know how to define variables as Global in ECore/OCL.

In my ecore, i have recursive operation calls and it takes a set as input and keep filling this set. I would like to define that Set as global variable so it will becomes accessible through out my ecore/all OCL statements in Ecore.

Do you have any idea?

Cheers.

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Re: Global Variables in OCL [message #1060063 is a reply to message #1060061]

Wed, 22 May 2013 19:17

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

How would you solve this in Java? No global variables there either. The
same scope approaches work for OCL.

Regards

Ed Willink

On 22/05/2013 19:36, ModelGeek Mising name wrote:
> I would like to know how to define variables as Global in ECore/OCL.
>
> In my ecore, i have recursive operation calls and it takes a set as
> input and keep filling this set. I would like to define that Set as
> global variable so it will becomes accessible through out my ecore/all
> OCL statements in Ecore.
>
> Do you have any idea?
>
> Cheers.

Report message to a moderator

Re: Global Variables in OCL [message #1060114 is a reply to message #1060063]

Thu, 23 May 2013 07:43

ModelGeek Mising name

Messages: 550
Registered: June 2011

Senior Member

thanks!

But can i have static attribute/property in Ecore instead?

So i can access them in OCL code like ClassName.propertyName.

Cheers,

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Re: Global Variables in OCL [message #1060150 is a reply to message #1060114]

Thu, 23 May 2013 10:36

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Ecore does not support static properties. UML does.

OCL 2.2 added them, so support is probably patchy.

The Ecore binding of Eclipse OCL parses them but has no distinctive
evaluation support.

The Pivot binding of Eclipse OCL parses them but has poorly tested
evaluation support.

It is much easier to just create a GlobalVariables class (which in Java
you might well use in a
non-static fashion as GlobalVariables.INSTANCE.SOMETHING)

[Truly global variables are a very bad idea because it makes it
needlessly hard to reuse your code as a subsystem of a larger system
that may have more than one instance of your subsystem.]

Regards

Ed Willink

On 23/05/2013 08:43, ModelGeek Mising name wrote:
> thanks!
>
> But can i have static attribute/property in Ecore instead?
> So i can access them in OCL code like ClassName.propertyName.
>
> Cheers,

Report message to a moderator

Re: Global Variables in OCL [message #1060182 is a reply to message #1060150]

Thu, 23 May 2013 12:14

ModelGeek Mising name

Messages: 550
Registered: June 2011

Senior Member

thanks again.

Actaully, i am creating/instantiating ecore at runtime(programmatically) and evaluating using delegates so GlobalVariables.INSTANCE.SOMETHING seems not applicable for me? Do you have any suggession regaring implementing static properties in above mentioned situation.

Cheers

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Re: Global Variables in OCL [message #1060186 is a reply to message #1060182]

Thu, 23 May 2013 12:34

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

You just bmake GlobalVariables navigable

self.........globalVariables.........

Regards

Ed Willink

On 23/05/2013 13:14, ModelGeek Mising name wrote:
> thanks again.
>
> Actaully, i am creating/instantiating ecore at
> runtime(programmatically) and evaluating using delegates so
> GlobalVariables.INSTANCE.SOMETHING seems not applicable for me? Do you
> have any suggession regaring implementing static properties in above
> mentioned situation.
>
> Cheers

Report message to a moderator

Re: Global Variables in OCL [message #1060211 is a reply to message #1060186]

Thu, 23 May 2013 14:18

ModelGeek Mising name

Messages: 550
Registered: June 2011

Senior Member

if i make static/global variable navigable, then i feel the concept for static property will be gone as for any static property(in Java), we just need ClassName.property.

Cheers,

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