private com.google.protobuf.SingleFieldBuilder<
          JSystemPiqi.buy_item_request, JSystemPiqi.buy_item_request.Builder, JSystemPiqi.buy_item_requestOrBuilder> 
          getBuyItemFieldBuilder() {
        if (buyItemBuilder_ == null) {
          buyItemBuilder_ = new com.google.protobuf.SingleFieldBuilder<
              JSystemPiqi.buy_item_request, JSystemPiqi.buy_item_request.Builder, JSystemPiqi.buy_item_requestOrBuilder>(
                  buyItem_,
                  getParentForChildren(),
                  isClean());
          buyItem_ = null;
        }
        return buyItemBuilder_;
      }