public MyDSLJavaValidator extends AbstractMyDSLJavaValidator {

	private Result result;

	@Check
	public void checkRoot(Root root) {
		result = new Interpreter().interpret(root);
	}

	@Check
	public void checkSomething(Something something) {
		// regular checking
		if (result != null) {
			// result aware checking
		}
	}

public class MyDslValidator extends AbstractDNAplJavaValidator {

	@Inject
	private IResourceScopeCache resourceScopeCache;
	
	/**
	 * Used by getRegisteredAdapter to obtain the ResourceAdapter. 
	 */
	class Type {}
	
	/* 
	 * Sebastian Zarnekow wrote, in response to Jonathan Blakes:
	 * You should not store the result in the validator as the instance will
	 * be shared for different resources. Attach the result to the resource 
	 * instead (probably as an EAdapter). I'd recommend to use the 
	 * IResourceScopeCache. 
	 */
	/**
	 * Used to add functionality to the current resource (like the result of the
	 * interpretation) and cache it in such a way that it is discard as soon as
	 * the model changes.
	 */
	class ResourceAdapter extends AdapterImpl {
		private Root root;
		public ResourceAdapter(Root root) {
			this.root = root;
		}
		public boolean isAdapterForType(Object type) {
			if (type == Type.class) 
				return true;
			return false;
		}
		public Result getResult() {
			return resourceScopeCache.get("Root", root.eResource(), new Provider<Result>() {
				public Result get() {
					Interpreter interpreter = new Interpreter(root);
					return interpreter.getResult();
				}
			);
		}
	
	/**
	 * Add a ResourceAdapter to the resource being validated.
	 * @param root The root EObject of the grammar.
	 */
	@Check
	public void checkRoot(final Root root) {
		// Add a ResourceAdapter to the resource being validated
		EList<Adapter> adapters = root.eResource().eAdapters();
		if (Iterables.isEmpty((Iterables.filter(adapters, ResourceAdapter.class)))) {
			adapters.add(new ResourceAdapter(root));
		}
	}
	
	/**
	 * Accessor that goes via a ResourceAdapter to get the cached Result.
	 */
	private Result getResult() {
		return ((ResourceAdapter) EcoreUtil.getRegisteredAdapter(getCurrentObject().eResource(), Type.class)).getResult();
	}
	
	@Check
	public void checkSomething(Something something) {
               Result = getResult();
               ...