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Default value literal [message #781048]

Fri, 20 January 2012 08:01

Martin odloucký

Messages: 49
Registered: July 2010

Member

Hello,

I need a default value for a 0..1 reference to be generated from my model definition. The default value is an instance of some class in the model. I tried to use default value literal but I do not quite understand what to type in there since it is a textual information. I googled and searched but have found only very little explanation of how the default value literal is used.

Thank you

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Re: Default value literal [message #781174 is a reply to message #781048]

Fri, 20 January 2012 08:22

Ed Merks

Messages: 33133
Registered: July 2009

Senior Member

Martin,

Comments below.

On 20/01/2012 9:01 AM, Martin odloucký wrote:
> Hello,
> I need a default value for a 0..1 reference to be generated from my
> model definition.
References can't have static defaults.
> The default value is an instance of some class in the model.
What resource contains that instance?
> I tried to use default value literal but I do not quite understand
> what to type in there since it is a textual information. I googled and
> searched but have found only very little explanation of how the
> default value literal is used.
You'll need to modify generated code for computing defaults. You could
look at EGenericTypeImpls use of eJavaObject as an example.
> Thank you

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Default value literal [message #1766090 is a reply to message #781174]

Thu, 15 June 2017 14:41

Veselin Markov

Messages: 15
Registered: February 2012

Junior Member

Meanwhile it is 8 years later: Is it still true, that it's not possible to model a default value literal on a EAttribite in a EClass and the default value literal be an instance of another EClass from the same model?

Edit: I have to correct my question:

I didn't mean an EAttribute but EReference. Sorry

[Updated on: Thu, 15 June 2017 15:13]

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Re: Default value literal [message #1766093 is a reply to message #1766090]

Thu, 15 June 2017 15:13

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

In 'pure EMF' you can model it via a custom Java action.

In 'pure modeling' you could exploit the experimental support for shadow objects (object construction) in OCL to model it via an OCL default value.

Regards

Ed Willink

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