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Calling doGenerate in other doGenerate [message #1835954]

Thu, 17 December 2020 08:04

Alexandra Tritean

Messages: 37
Registered: March 2020

Member

Hello,

Is it viable to call doGenerate in other doGenerate method?

What I'm trying to achieve is the following flow: from .datamodel file -> generate . model file -> (from model file) -> generate .java files.
I have both generators working fine as standalone generators, but when queuing them I'm struggling with a NullPointerException and I'm not sure if I'm missing something in the configuration or the flow is not correct.

class DatamodelGenerator extends AbstractGenerator {
	
	override void doGenerate(Resource resource, IFileSystemAccess2 fsa, IGeneratorContext context) {
		// datamodel to model generation
		
		var resourceURI = resource.URI
		var modelFileName = resourceURI.toString.substring(resourceURI.toString.lastIndexOf('/')+1).replace("datamodel","model");
		if(fsa.isFile(modelFileName)) {
			var modelResourceURI = resourceURI.trimSegments(resourceURI.segments.size - 2).appendSegment("src").appendSegment("main").appendSegment("resources").appendSegment(modelFileName)
			if(modelResourceURI.isPlatform){
				var modelResource = resource.resourceSet.getResource(modelResourceURI, true)
				var project = ResourcesPlugin.workspace.getRoot.getFile(new Path(modelResourceURI.toPlatformString(true))).project
				var modelGenerationFsa = new EclipseResourceFileSystemAccess2
				modelGenerationFsa.setProject(project)
                                modelGenerationFsa.setMonitor(new NullProgressMonitor())
modelGenerationFsa.setOutputConfigurations(outputConfigurationsMap)
				new ModelGenerator().doGenerate(modelResource, modelGenerationFsa, new GeneratorContext)
			}
		}
	}

What I saw while debugging is that after executing 1-2 lines from ModelGenerator, it randomly 'jumps' into GeneratorDelegate.afterGenerate with the generator being DatamodelDslGenerator. I suppose that I need some kind of synchronization/ executing ModelGenerator only after the DatamodelGenerator finished or something. I tried having the ModelGenerator.doGenerate call in the afterGenerate method of DatamodelGenerator, but that doesn't help either.

Am I doing something wrong? Is there another approach that I can follow in order to achieve the flow?

Thank you!

Kind Regards,

Alexandra

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Re: Calling doGenerate in other doGenerate [message #1835955 is a reply to message #1835954]

Thu, 17 December 2020 08:10

Christian Dietrich

Messages: 14492
Registered: July 2009

Senior Member

if you want two dsls to ping pong each other you need to
create a second custom written builder that touches the files
the first builder creates so that eclipse then calls the xtext builder on
the generates files again.

the approach you took could work too, but i dont see the problem with NPE as you did not post what is null.

Need professional support for Xtext, Xpand, EMF?
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Re: Calling doGenerate in other doGenerate [message #1835959 is a reply to message #1835955]

Thu, 17 December 2020 08:52

Alexandra Tritean

Messages: 37
Registered: March 2020

Member

Looks like sharing your problem with someone opens your eyes. :)

In ModelGenerator I have two extensions, which seem to be null.

@Inject extension TracingSugar (org.eclipse.xtext.generator.trace.node)
@Inject extension GeneratedClasses ( written by me)

Is there any particular way in which I should initialize the ModelGenerator?

Kind Regards,

Alexandra

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