private com.google.protobuf.SingleFieldBuilder<
          JOutPiqi.recipient, JOutPiqi.recipient.Builder, JOutPiqi.recipientOrBuilder> 
          getRecipientFieldBuilder() {
        if (recipientBuilder_ == null) {
          recipientBuilder_ = new com.google.protobuf.SingleFieldBuilder<
              JOutPiqi.recipient, JOutPiqi.recipient.Builder, JOutPiqi.recipientOrBuilder>(
                  recipient_,
                  getParentForChildren(),
                  isClean());
          recipient_ = null;
        }
        return recipientBuilder_;
      }