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Access all Resources in Eclipse(Xtext) Project [message #1767945] Wed, 12 July 2017 10:05 Go to next message
Lukas Schaus is currently offline Lukas SchausFriend
Messages: 25
Registered: October 2016
Junior Member
Hello,

I am developing a DSL using xtext 2.12. The DSL supports a user in writing software requirements.

I have the following Use Case:
A user wants to structure his requirements in multiple files. If any of the files is saved I want to generate an overview of all requirements that are specified in all of the files.

I found a solution from 2011:
https://kthoms.wordpress.com/2011/07/

Unfortunately it does not seem to work in the current version of xtext.

How can I access all resources in my Generator

Thanks in advance.

Lukas

[Updated on: Wed, 12 July 2017 10:24]

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Re: Access all Resources in Eclipse(Xtext) Project [message #1767948 is a reply to message #1767945] Wed, 12 July 2017 10:17 Go to previous messageGo to next message
Christian Dietrich is currently offline Christian DietrichFriend
Messages: 12237
Registered: July 2009
Senior Member
it should be no problem to adapt https://kthoms.wordpress.com/2011/07/
to the new IGenerator2 interface in recent xtext versions.

so what do you exactly mean by "does not seem to work"


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Re: Access all Resources in Eclipse(Xtext) Project [message #1767970 is a reply to message #1767948] Wed, 12 July 2017 13:14 Go to previous messageGo to next message
Lukas Schaus is currently offline Lukas SchausFriend
Messages: 25
Registered: October 2016
Junior Member
I followed the Instructions that were given in Karstens Blog, but I had problems to get the binding of the old Generator(1) components right.

Quote:

it should be no problem to adapt https://kthoms.wordpress.com/2011/07/
to the new IGenerator2 interface in recent xtext versions.

You are probably right, but I get confused in the workings of the IGenerator2. For Instance I found that the JavaProjectBasedBuilderParticipant was replaced by the BuilderParticipant? And the MyDslLangGenerator extends AbstractGenerator what it did not do before.

What I was trying to say with "does not seem to work". I am confused and would need help to adapt the changes to the new IGenerator2 Interface.

You would help me a lot if you could give me some hints or point me to an example where somebody has done the same thing.

I guess it is a pretty standard use case...

Thank you for your Time.
Re: Access all Resources in Eclipse(Xtext) Project [message #1767975 is a reply to message #1767970] Wed, 12 July 2017 13:34 Go to previous messageGo to next message
Christian Dietrich is currently offline Christian DietrichFriend
Messages: 12237
Registered: July 2009
Senior Member
if i knew that pointer i would have pointed.

and as i said:

new Interface is Igenerator2 so you may need a Igenerator2
and as you have discovered its BuilderParticipant now

so i would have thought a naive adaption of these two would work.

untested

public class BuilderParticipant2 extends BuilderParticipant {

	@Inject
	private ResourceDescriptionsProvider resourceDescriptionsProvider;

	@Inject
	private IContainer.Manager containerManager;

	@Inject(optional = true)
	private IGenerator3 generator;

	protected ThreadLocal<Boolean> buildSemaphor = new ThreadLocal<Boolean>();

	@Override
	public void build(IBuildContext context, IProgressMonitor monitor) throws CoreException {
		buildSemaphor.set(false);
		super.build(context, monitor);
	}
	
	@Override
	protected void handleChangedContents(Delta delta, IBuildContext context,
			EclipseResourceFileSystemAccess2 fileSystemAccess) throws CoreException {
		super.handleChangedContents(delta, context, fileSystemAccess);
		if (!buildSemaphor.get() && generator != null) {
			invokeGenerator(delta, context, fileSystemAccess);
		}
	}
	private void invokeGenerator(Delta delta, IBuildContext context, EclipseResourceFileSystemAccess2 access) {
		buildSemaphor.set(true);
		Resource resource = context.getResourceSet().getResource(delta.getUri(), true);
		if (shouldGenerate(resource, context)) {
			IResourceDescriptions index = resourceDescriptionsProvider.createResourceDescriptions();
			IResourceDescription resDesc = index.getResourceDescription(resource.getURI());
			List<IContainer> visibleContainers = containerManager.getVisibleContainers(resDesc, index);
			for (IContainer c : visibleContainers) {
				for (IResourceDescription rd : c.getResourceDescriptions()) {
					context.getResourceSet().getResource(rd.getURI(), true);
				}
			}

			MonitorBasedCancelIndicator cancelIndicator = new MonitorBasedCancelIndicator(
					new NullProgressMonitor()); //maybe use reflection to read from fsa
			GeneratorContext generatorContext = new GeneratorContext();
			generatorContext.setCancelIndicator(cancelIndicator);
			generator.doGenerate(context.getResourceSet(), access, generatorContext);
		}
	}

}
public interface IGenerator3 extends IGenerator2 {
    public void doGenerate(ResourceSet input, IFileSystemAccess2 fsa, IGeneratorContext context);
}


and no its a pretty non std usecase.


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Re: Access all Resources in Eclipse(Xtext) Project [message #1768155 is a reply to message #1767975] Fri, 14 July 2017 08:31 Go to previous messageGo to next message
Lukas Schaus is currently offline Lukas SchausFriend
Messages: 25
Registered: October 2016
Junior Member
Thank you very much Christian. The adaptations you made worked perfectly.

I additionally had to bind the IGenerator3 in the main project and the BuilderParticipant in the UI Project.

Also I implemented a new Interface that replaces the AbstractGenerator. The new AbstractGenerator2 implements my IGenerator3.

As you can see in the code below I managed to extract a root element from every file. (Root is the Root rule in my grammar)

Is there a way to join those root elements?

For anybody who has the same use case like me here the code:

MyDslGenerator:
class MyDslGenerator extends AbstractGenerator2 {
	
	override doGenerate(ResourceSet input, IFileSystemAccess2 fsa, IGeneratorContext context) {
		val allResources = input.resources.map(r|r.allContents.toIterable.filter(Root)).flatten
        //do stuff


AbstractGenerator2:
public abstract class AbstractGenerator2 implements IGenerator3 {

	@Override
	public void doGenerate(Resource input, IFileSystemAccess2 fsa, IGeneratorContext context) {
	}

	@Override
	public void beforeGenerate(Resource input, IFileSystemAccess2 fsa, IGeneratorContext context) {
	}

	@Override
	public void afterGenerate(Resource input, IFileSystemAccess2 fsa, IGeneratorContext context) {
	}

	@Override
	public void doGenerate(ResourceSet input, IFileSystemAccess2 fsa, IGeneratorContext context) {
	}
}


IGenerator3:
interface IGenerator3 extends IGenerator2 {
	def void doGenerate(ResourceSet input, IFileSystemAccess2 fsa, IGeneratorContext context);
}


class MyDslModule extends AbstractMarsLangRuntimeModule {	
	def Class<? extends IGenerator3> bindIGenerator3 () {
        return MyDslGenerator
    }
}


@FinalFieldsConstructor
class MyDslUiModule extends MyDslUiModule {
	
	override def Class<? extends IXtextBuilderParticipant> bindIXtextBuilderParticipant() {
        return BuilderParticipant2
    }
}
Re: Access all Resources in Eclipse(Xtext) Project [message #1792969 is a reply to message #1768155] Thu, 26 July 2018 16:08 Go to previous message
Denis  Kuniß is currently offline Denis KunißFriend
Messages: 13
Registered: January 2010
Junior Member
Thanks to all. Helped me too to solve my problem. So want to give a little bit back:
As JavaProjectBasedBuilderParticipant has been deprecated, I tried to implement this based on the new org.eclipse.xtext.builder.BuilderParticipant which was recommended in the deprecation note.

The following worked for me, I just renamed the original IGenerator2 interface to IGeneratorForResourceSet
class BuilderParticipantForResourceSet extends BuilderParticipant {
  @Inject
  ResourceDescriptionsProvider resourceDescriptionsProvider;
 
  @Inject
  IContainer.Manager containerManager;
 
  @Inject (optional=true)
  IGeneratorForResourceSet generator;
 
  protected ThreadLocal<Boolean> buildSemaphor = new ThreadLocal<Boolean>();
 
  override void build(IBuildContext context, IProgressMonitor monitor) throws CoreException {
    buildSemaphor.set(false);
    super.build(context, monitor);
  }
 
  override void handleChangedContents(Delta delta, IBuildContext context, IFileSystemAccess fileSystemAccess) {
    super.handleChangedContents(delta, context, fileSystemAccess);
    if (!buildSemaphor.get() && generator !== null) {
      invokeGenerator(delta, context, fileSystemAccess);
    }
  }
 
  private def void invokeGenerator (Delta delta, IBuildContext context, IFileSystemAccess fileSystemAccess) {
    buildSemaphor.set(true);
    val Resource resource = context.getResourceSet().getResource(delta.getUri(), true);
    if (shouldGenerate(resource, context)) {
      val IResourceDescriptions index = resourceDescriptionsProvider.createResourceDescriptions();
      val IResourceDescription resDesc = index.getResourceDescription(resource.getURI());
      val List<IContainer> visibleContainers = containerManager.getVisibleContainers(resDesc, index);
      for (IContainer c : visibleContainers) {
        for (IResourceDescription rd : c.getResourceDescriptions()) {
          context.getResourceSet().getResource(rd.getURI(), true);
        }
      }
 
      generator.doGenerate(context.getResourceSet(), fileSystemAccess as IFileSystemAccess2);
    }
  }	
}


Still having one doubt: Is this working without Eclipse too? I thought, the ui package is used for Eclipse inside only. Am I wrong?
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