[news.eclipse.modeling.m2t] Re: Invoking Expand generator from Java

[Sven Efftinge <sven.efftinge@xxxxxxxxx>]

Hi John,

you're on the right track :-)
The XpandFacade can be used like this:

// create an execution context
XpandExecutionContextImpl execCtx = new 
XpandExecutionContextImpl(output, null);
execCtx.setFileEncoding("iso-8859-1"); //$NON-NLS-1$
execCtx.registerMetaModel(new JavaBeansMetaModel());

// create a facade
XpandFacade facade = XpandFacade.create(execCtx);

// invoke a template definition
facade.evaluate("foo:bar::MyTemplate::definition", myObject);


Hope that helps.
Cheers,
Sven


John schrieb:
> As I develop a generator with Xtext, I'm curious about options to reduce 
> the resource requirements.  One thing that seems expensive in my 
> scenario is initializing the workflow for each model file.  My project 
> has several thousand model files, so it looks like significant time may 
> go into initializing the MWE workflow.
>
> Since I'm running the process from a Java application that is already 
> invoking the parser directly (through XtextResourceSet), I wonder if 
> there is a reasonable API to invoke the Xpand without starting an MWE 
> Workflow.  What I'm not clear on is how I may provide the the instance 
> with the model instance that will drive template expansion.  I see 
> org.eclipse.xpand2.XpandFacade, but its JavaDoc is bare and searches 
> don't yield any apparently useful references.
>
> Thanks for you advice!
> John


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