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Derived attribute without adding extra attr in metamodel [message #237494]

Sun, 26 July 2009 12:39

Mihir

Messages: 83
Registered: July 2009

Member

Hello,

Assume that I've two classes as below. Focus on ObjectTemplateExp. I
want is to fetch the value of name attr from VariableExp class and
display it as a label for the instance of ObjectTemplateExp on the
editor. Can this be done without using/adding derived attribute to the
ObjectTemplateExp class?? Because, I don't want to change/add anything
in the metamodel.

class ObjectTemplateExp {
val VariableExp variable;
val PropertyTemplateExp[*] propertyTemplates;
ref EClass referredClass;
}

class PropertyTemplateExp {
val ExtendedExp value;
ref ecore.EStructuralFeature referredProperty;
}

class VariableExp {
!unique !ordered attr String name;
}

Thanks a million for your help,

Cheers,
Mihir

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Re: Derived attribute without adding extra attr in metamodel [message #237628 is a reply to message #237494]

Mon, 27 July 2009 14:36

Alexander Shatalin

Messages: 2928
Registered: July 2009

Senior Member

Hello Mihir,

You can create LabelMapping (instead of FeaturelabelMapping) below the NodeMapping
for ObjectTemplateExp and implement/plug in custom parser for this label
using runtime extension point.

-----------------
Alex Shatalin

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Re: Derived attribute without adding extra attr in metamodel [message #237651 is a reply to message #237628]

Mon, 27 July 2009 18:17

Mihir

Messages: 83
Registered: July 2009

Member

Hello Alex,

Thanks for the hint. :) I'll try and experiment with what you have
mentioned. Just to let you know that I'm a newbie to EMF GMF so might
sometime ask stupid questions.

I'll get back to you soon.

Cheers,
Mihir

Alex Shatalin wrote:
> Hello Mihir,
>
> You can create LabelMapping (instead of FeaturelabelMapping) below the
> NodeMapping for ObjectTemplateExp and implement/plug in custom parser
> for this label using runtime extension point.
>
> -----------------
> Alex Shatalin
>
>

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