select Epacket1.Epacket2.MyEClass

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

import "http://www.eclipse.org/emf/2002/Ecore" as ecore
generate mydsl "mydsl"

Model:
	"select" type=[ecore::EClass]
	;

public class MqlScopeProvider extends AbstractMqlScopeProvider
{
    @Override
    public IScope getScope(EObject context, EReference reference)
    {
        ResourceSet rs = new ResourceSetImpl();
        Resource resource = rs.getResource(URI.createURI("my.ecore"), true);
        List<EClass> classes = new ArrayList<>();
        TreeIterator<EObject> allContents = EcoreUtil.<EObject> getAllContents(resource, true);
        while (allContents.hasNext())
        {
            EObject next = allContents.next();
            if (next instanceof EClass)
            {
                EClass eClass = (EClass) next;
                classes.add(eClass);
            }
        }
      return Scopes.scopeFor(classes);
  }

}

  IResourceSetProvider resourceSetProvider = injector.getInstance(IResourceSetProvider.class);
        FileExtensionProvider extensionProvider = injector.getInstance(FileExtensionProvider.class);

        ResourceSet resourceSet = resourceSetProvider.get(null);
        URI uri = URI.createURI("synthetic:/query." + extensionProvider.getPrimaryFileExtension());
        XtextResource xtextResource = (XtextResource) resourceSet.createResource(uri);
        resourceSet.getResources().add(xtextResource);
        Resource createResource = resourceSet.createResource(URI.createURI("platform:/plugin/my.ecore.plugin/model/model.ecore"));
        resourceSet.getResources().add(createResource);

        IEditedResourceProvider queryResourceProvider = new IEditedResourceProvider() {
            @Override
            public XtextResource createResource()
            {
                return xtextResource;
            }
        };
        EmbeddedEditorFactory editorFactory = injector.getInstance(EmbeddedEditorFactory.class);

        QueryHandlerDialog queryHandlerDialog = new QueryHandlerDialog(shell, editorFactory, queryResourceProvider);
        int open = queryHandlerDialog.open();

XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
		ProjectDescription projectDescription = new ProjectDescription();
		projectDescription.setName("dummy");
		projectDescription.attachToEmfObject(resourceSet);
		Map<String, ResourceDescriptionsData> dataMap = Maps.<String, ResourceDescriptionsData>newHashMap();
        final ChunkedResourceDescriptions index = new ChunkedResourceDescriptions(dataMap, resourceSet);
        ResourceDescriptionsData data = new ResourceDescriptionsData(Lists.newArrayList());
		index.setContainer(projectDescription.getName(), data);
		FileExtensionProvider extensionProvider = injector.getInstance(FileExtensionProvider.class);
		URI uri = URI.createURI("synthetic:/query." + extensionProvider.getPrimaryFileExtension());
		XtextResource xtextResource = (XtextResource) resourceSet.createResource(uri);
		
		
		resourceSet.getResources().add(xtextResource);
		Resource createResource = resourceSet.createResource(
				URI.createURI("platform:/plugin/myModel/model/myModel.ecore"));
		try {
			createResource.load(null);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		resourceSet.getResources().add(createResource);
		IResourceDescription resourceDescription = IResourceServiceProvider.Registry.INSTANCE.getResourceServiceProvider(createResource.getURI()).getResourceDescriptionManager().getResourceDescription(createResource);
		data.addDescription(createResource.getURI(), resourceDescription);