code: public static boolean isInternalType(Types typeUtils, TypeMirror type) {
  		Element element = ((TypeElement) typeUtils.asElement(type)).getEnclosingElement();
  		return element.getKind() != ElementKind.PACKAGE;
  	}
docs: Test if the given type is an internal type.
  @param typeUtils
  @param type
  @return True if the type is an internal type, false otherwise.
  @author vvakame