public List<MetaData> mapToDataAll(final List<MetaDataDO> metaDataDOList) {
        return Optional.ofNullable(metaDataDOList)
                .map(v -> v.stream().map(this::mapToData).collect(Collectors.toList()))
                .orElse(null);
    }
Map to data all list.

@param metaDataDOList the meta data do list
@return the list
shenyu-admin/src/main/java/org/apache/shenyu/admin/transfer/MetaDataTransfer.java