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Customizing Xtext Model [message #1152938]

Thu, 24 October 2013 05:08

Eclipse User

Hello everynone,
I want to set some default values for some modelelements of my Xtext-Model. But it is not possible within the xtext-grammer file. I read something about a IXtext2EcorePostProcessor here and wanted to know, if it is still the best way to do it.

Here the link to the introduced method:
http://christiandietrich.wordpress.com/2011/07/22/customizing-xtext-metamodel-inference-using-xtend2/

My special case is the following:
- I'm importing the UML2-Metamodel and create a Xtext-Grammer for a subset of this metamodel (Classdiagrams)
- Now I want to set some properties by default, so the created Xtext-Model (instance of the UML2-Metamodel) is valid

Does someone has any experiences with this topic?

Regards,
Alex

Re: Customizing Xtext Model [message #1152956 is a reply to message #1152938]

Thu, 24 October 2013 05:25

Eclipse User

Hi,

did you have a look at AbstractCleaningLinker.afterModelLinked
(I dont know if this is the best place)
~Christian

Re: Customizing Xtext Model [message #1152967 is a reply to message #1152956]

Thu, 24 October 2013 05:33

Eclipse User

Hi,
No I didn't look at AbstractCleaningLinker.afterModelLinked yet, but I will do it.
Is it a bad idea to set some default values programmatically by accesing the xtext-model via a XtextResoure?

Like this way:

//set name of the model (root element)
((Model) xtextResource.getContents().get(0)).setName("defaultModelName");

I could just do this in the .ui-plugin before serializing the model.

Alex

Re: Customizing Xtext Model [message #1152984 is a reply to message #1152967]

Thu, 24 October 2013 05:48

Eclipse User

Hi,
give it a try. dont know if this will have side effects.

Re: Customizing Xtext Model [message #1173576 is a reply to message #1152984]

Wed, 06 November 2013 11:11

Eclipse User

Hi,

what do you think is the better procedure for setting some default values and references to modelelements.
1.Extend a Linker (like explained here: http://www.eclipse.org/forums/index.php/m/29585/?srch=stereotype+in+model#msg_29585)

public class MyLinker extends Linker {

	@Inject
	private CdalfGrammarAccess grammarAccess;
        @Override
	public void ensureLinked(EObject obj, IDiagnosticProducer producer) {
		super.ensureLinked(obj, producer); 
		if (obj instanceof SomeElements) {
			SomeElementsasso = (SomeElements) obj;
			// set default attributes
			
			
		}
	}

2. To extend AbstractCleaningLinker
And overriding the afterModelLinked -method?

~Alex

Re: Customizing Xtext Model [message #1173748 is a reply to message #1173576]

Wed, 06 November 2013 13:37

Eclipse User

Hi

i think the second one is better.

Re: Customizing Xtext Model [message #1174797 is a reply to message #1173748]

Thu, 07 November 2013 05:14

Eclipse User

Hi,

but when I override the afterModelLinked(model, diagnosticsConsumer); I have to iterate the whole model to find the necessary element I'm looking for. So
this might be quick complicated if a model is complex.

Or am I wrong?
~Alex

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