code: private String getControlInterfaceHint() {
  
          Control controlAnnotation = _fieldDecl.getAnnotation(Control.class);
          String interfaceHint = null;
          try {
              // always excepts
              controlAnnotation.interfaceHint();
          } catch (MirroredTypeException mte) {
              interfaceHint = ("java.lang.Object".equals(mte.getQualifiedName())) ? null : mte.getQualifiedName();
          }
          return interfaceHint;
      }
docs: Get the interface hint attribute value (as a string) from the Control annotation,
  if it wasn't specified return null.