apollo-portal/src/main/java/com/ctrip/framework/apollo/openapi/util/OpenApiBeanUtils.java/OpenApiBeanUtils/batchTransformFromNamespaceBOs
class OpenApiBeanUtils:  public static List<OpenNamespaceDTO> batchTransformFromNamespaceBOs(
      List<NamespaceBO> namespaceBOs) {
    if (CollectionUtils.isEmpty(namespaceBOs)) {
      return Collections.emptyList();
    }

    return namespaceBOs.stream()
            .map(OpenApiBeanUtils::transformFromNamespaceBO)
            .collect(Collectors.toCollection(LinkedList::new));
  }