class SmlValidator extends AbstractSmlValidator {
    
    @Inject
    IResourceServiceProvider.Registry resourceServiceProviderRegistry = IResourceServiceProvider.Registry.INSTANCE;
    
    @Inject
    ResourceDescriptionsProvider resourceDescriptionsProvider;
    
    @Inject
    IContainer.Manager containerManager;
    
    @Inject
    ISmlNamesAreUniqueValidationHelper helper;

    @Check
    def checkUniqueNamesInProjectOf(SmlModel smlModel) {
        println("checkUniqueNamesInProjectOf SmlType " + smlModel + " resource " + smlModel.eResource)

        val Resource resource = smlModel.eResource
        val IResourceDescriptions resourceDescriptions = resourceDescriptionsProvider.getResourceDescriptions(resource)
        
        val IResourceServiceProvider resourceServiceProvider = resourceServiceProviderRegistry.getResourceServiceProvider(resource.getURI());
        val IResourceDescription.Manager manager = resourceServiceProvider.getResourceDescriptionManager();
        
        // Issue: 
        // Two ways to get resourceDescription, whats is the difference???
        // If use resourceDescription from manager, it works fine.
        val IResourceDescription resourceDescription = manager.getResourceDescription(resource);
        // If use resourceDescription from resourceDescriptions, exception thrown when found duplicate names.
//        val IResourceDescription resourceDescription  = resourceDescriptions.getResourceDescription(resource.URI)
        
        val ArrayList<IResourceDescription> outsideVisibleResourceDescriptions = new ArrayList;
        for (visibleContainer : containerManager.getVisibleContainers(resourceDescription, resourceDescriptions)) {
            for (visibleResourceDesc : visibleContainer.resourceDescriptions) {
                if(visibleResourceDesc.URI != resourceDescription.URI){
                     outsideVisibleResourceDescriptions.add(visibleResourceDesc)
                }
            }
        }

        for (eod : resourceDescription.exportedObjects) {
        	for (ovrd : outsideVisibleResourceDescriptions) {
                    for (oveod : ovrd.exportedObjects) {
                        if(eod.name == oveod.name){
                            helper.createError(eod, eod.EClass, this)
                        }
                    }
        	}
        }
    }
}

interface ISmlNamesAreUniqueValidationHelper {
    def void createError(IEObjectDescription description, EClass clusterType, ValidationMessageAcceptor acceptor)
}

class SmlNamesAreUniqueValidationHelper extends NamesAreUniqueValidationHelper implements ISmlNamesAreUniqueValidationHelper {
    // protected to public 
    override createError(IEObjectDescription description, EClass clusterType, ValidationMessageAcceptor acceptor) {
        super.createDuplicateNameError(description, clusterType, acceptor)
    }
}

class SmlRuntimeModule extends AbstractSmlRuntimeModule {
    override configure(Binder binder) {
        super.configure(binder)
        binder.bind(ISmlNamesAreUniqueValidationHelper).to(SmlNamesAreUniqueValidationHelper);      
    }
}

val IResourceDescription resourceDescription = manager.getResourceDescription(resource);

val IResourceDescription resourceDescription  = resourceDescriptions.getResourceDescription(resource.URI)

val IResourceDescription resourceDescription = manager.getResourceDescription(resource);

val IResourceDescription resourceDescription  = resourceDescriptions.getResourceDescription(resource.URI)

0    [Worker-3] ERROR org.eclipse.xtext.validation.CompositeEValidator  - Error executing EValidator
java.lang.IllegalArgumentException: You can only add issues for EObjects contained in the currently validated resource 'platform:/resource/test.sml/AAA.sml'. But the given EObject was contained in 'null'
	at org.eclipse.xtext.validation.AbstractDeclarativeValidator.checkIsFromCurrentlyCheckedResource(AbstractDeclarativeValidator.java:571)
	at org.eclipse.xtext.validation.AbstractDeclarativeValidator.acceptError(AbstractDeclarativeValidator.java:554)