public Builder mergeTransport(org.bwapi.proxy.messages.GameMessages.UnitId value) {
        if (transportBuilder_ == null) {
          if (((bitField1_ & 0x00000400) == 0x00000400) &&
              transport_ != org.bwapi.proxy.messages.GameMessages.UnitId.getDefaultInstance()) {
            transport_ =
              org.bwapi.proxy.messages.GameMessages.UnitId.newBuilder(transport_).mergeFrom(value).buildPartial();
          } else {
            transport_ = value;
          }
          onChanged();
        } else {
          transportBuilder_.mergeFrom(value);
        }
        bitField1_ |= 0x00000400;
        return this;
      }