private com.google.protobuf.RepeatedFieldBuilder<
          org.bwapi.proxy.messages.GameMessages.UpgradeLevel, org.bwapi.proxy.messages.GameMessages.UpgradeLevel.Builder, org.bwapi.proxy.messages.GameMessages.UpgradeLevelOrBuilder> 
          getUpgradeLevelsFieldBuilder() {
        if (upgradeLevelsBuilder_ == null) {
          upgradeLevelsBuilder_ = new com.google.protobuf.RepeatedFieldBuilder<
              org.bwapi.proxy.messages.GameMessages.UpgradeLevel, org.bwapi.proxy.messages.GameMessages.UpgradeLevel.Builder, org.bwapi.proxy.messages.GameMessages.UpgradeLevelOrBuilder>(
                  upgradeLevels_,
                  ((bitField0_ & 0x00080000) == 0x00080000),
                  getParentForChildren(),
                  isClean());
          upgradeLevels_ = null;
        }
        return upgradeLevelsBuilder_;
      }