public Builder mergeSupplyProvider(org.bwapi.proxy.messages.GameMessages.UnitType value) {
        if (supplyProviderBuilder_ == null) {
          if (((bitField0_ & 0x00000040) == 0x00000040) &&
              supplyProvider_ != org.bwapi.proxy.messages.GameMessages.UnitType.getDefaultInstance()) {
            supplyProvider_ =
              org.bwapi.proxy.messages.GameMessages.UnitType.newBuilder(supplyProvider_).mergeFrom(value).buildPartial();
          } else {
            supplyProvider_ = value;
          }
          onChanged();
        } else {
          supplyProviderBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000040;
        return this;
      }