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Adding Property to EMF Objects Dynamically [message #1385051]

Tue, 03 June 2014 22:13

Eclipse User

Hi,

I want to add a property to EMF Object Dynamically for eg, if we have a grammar below :

Model:
greetings+=Greeting*;
Greeting:
'Hello' name=ID '!';

After EMF classes is generated, I want to add another property lets say greetingID to
Greeting Class at runtime. Is there any way to do achieve this ?

Cheers

Kunal

Re: Adding Property to EMF Objects Dynamically [message #1385053 is a reply to message #1385051]

Wed, 04 June 2014 00:26

Eclipse User

http://christiandietrich.wordpress.com/2011/07/22/customizing-xtext-met
amodel-inference-using-xtend2/

Re: Adding Property to EMF Objects Dynamically [message #1385054 is a reply to message #1385051]

Wed, 04 June 2014 00:35

Eclipse User

P.s. and for actually setting it you could use iderivedstatecomputer
BTW what is your actual/real usecase

Re: Adding Property to EMF Objects Dynamically [message #1385055 is a reply to message #1385054]

Wed, 04 June 2014 01:02

Eclipse User

Hi Christian,
Thanks for the reply. My Actual/Real Use Case is I want to assign a property Id to each of my EMF Classes and that property should not be part of grammar ie it should not be displayed in Xtext editor . In other sense, I want a variable in Xtext Grammar and it should not be accessible in Xtext Editor but it can be accessed via generated EMF Classes.

Cheers

Kunal

Re: Adding Property to EMF Objects Dynamically [message #1385064 is a reply to message #1385055]

Wed, 04 June 2014 03:12

Eclipse User

On 04/06/2014 07:02, Kunal Khaware wrote:
> Hi Christian,
> Thanks for the reply. My Actual/Real Use Case is I want to assign a
> property Id to each of my EMF Classes and that property should not be
> part of grammar ie it should not be displayed in Xtext editor . In other
> sense, I want a variable in Xtext Grammar and it should not be
> accessible in Xtext Editor but it can be accessed via generated EMF
> Classes.

Hi

you need to swtich to a custom Ecore first (see, e.g.,
http://www.lorenzobettini.it/2014/02/switching-from-an-inferred-ecore-model-to-an-imported-one-in-your-xtext-grammar/
) and then you can add the additional field as "transient" so that it
won't be serialized when you save the file (it won't be shown in the
editor either).

cheers
Lorenzo

--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
HOME: http://www.lorenzobettini.it
Xtext Book:
http://www.packtpub.com/implementing-domain-specific-languages-with-xtext-and-xtend/book

Re: Adding Property to EMF Objects Dynamically [message #1385088 is a reply to message #1385064]

Wed, 04 June 2014 05:34

Eclipse User

Hi

the postprocessor can do the very same

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