apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/service/ItemService.java/ItemService/buildItem
class ItemService:  private ItemDTO buildItem(long namespaceId, int lineNum, ItemDTO sourceItem) {
    ItemDTO createdItem = new ItemDTO();
    BeanUtils.copyEntityProperties(sourceItem, createdItem);
    createdItem.setLineNum(lineNum);
    createdItem.setNamespaceId(namespaceId);
    return createdItem;
  }