public Builder setAddon(org.bwapi.proxy.messages.GameMessages.UnitId value) {
        if (addonBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          addon_ = value;
          onChanged();
        } else {
          addonBuilder_.setMessage(value);
        }
        bitField1_ |= 0x00200000;
        return this;
      }