@Override
  public ObjectIdentity getObjectIdentity(final Object domainObject) {
    final AclManaged aclManaged =
        AnnotationUtils.findAnnotation(domainObject.getClass(), AclManaged.class);
    // acl的所谓的class_id建议用AclClassId注解指定!
    final String typeName;
    if (aclManaged == null) {
      typeName = domainObject.getClass().getName();
    } else {
      if (aclManaged.value().isEmpty()) {
        logger.warn(domainObject.getClass() + "的AclClassId值为空");
        typeName = domainObject.getClass().getName();
      } else {
        typeName = aclManaged.value();
      }
    }

    final Serializable idValue = getIdValue(domainObject);
    if (idValue == null) {
      return null;
    }

    return new ObjectIdentityImpl(typeName, idValue);
  }