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Creating new class instance in OCL setting delegate [message #668187]

Wed, 04 May 2011 11:45

Nikolay Kasyanov

Messages: 30
Registered: September 2010
Location: Russia

Member

Hi!

Trying to use OCL setting delegate for generating attribute value.
I'm implementing some sort of instancing in my metamodel.
So, to fill in SystemInstance's parameters, I'm using setting delegate.
I need to generate new ParameterInstances from corresponding System's parameters attribute (collection of Parameter instances).
So, I need something like this:

if (system.oclIsUndefined()) then
	OrderedSet{}
else
	system.parameters->collect(p | here we create new ParameterInstance with parameter = p)
endif

but I can't figure out how to create ecore class instances in OCL
Here is the related part of ecore metamodel:

http://dl.dropbox.com/u/28481/metamodel.png

[Updated on: Wed, 04 May 2011 11:46]

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Re: Creating new class instance in OCL setting delegate [message #668262 is a reply to message #668187]

Wed, 04 May 2011 17:46

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi Nicholas

[Please use the OCL newsgroup for OCL queries.]

OCL is a side-effect free language so it has no construction of objects.
Except that you can construct collections and tuples.

Construction of new objects is in fact side-effect free so adding an
object construction syntax is under consideration.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=293622

I doubt that helps.

Regards

Ed Willink

On 04/05/2011 12:45, Nicholas Kasyanov wrote:
> Hi!
>
> Trying to use OCL setting delegate for generating attribute value.
> I'm implementing some sort of instancing in my metamodel.
> So, to fill in SystemInstance's parameters, I'm using setting delegate.
> I need to generate new ParameterInstances from corresponding System's
> parameters attribute (collection of Parameter instances).
> So, I need something like this:
>
>
> if (system.oclIsUndefined()) then
> OrderedSet{}
> else
> system.parameters->collect(p | here we create new
> ParameterInstance with parameter = p)
> endif
>
> but I can't figure out how to create ecore class instances in OCL
> Here is the related part of ecore metamodel:
>

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