private void processExclusions() {
   for (Element element : getElements(QueryExclude.class)) {
     if (element instanceof PackageElement) {
       conf.addExcludedPackage(((PackageElement) element).getQualifiedName().toString());
     } else if (element instanceof TypeElement) {
       conf.addExcludedClass(((TypeElement) element).getQualifiedName().toString());
     } else {
       throw new IllegalArgumentException(element.toString());
     }
   }
 }