public Builder addAllUpgradeLevels(
          java.lang.Iterable<? extends org.bwapi.proxy.messages.GameMessages.UpgradeLevel> values) {
        if (upgradeLevelsBuilder_ == null) {
          ensureUpgradeLevelsIsMutable();
          super.addAll(values, upgradeLevels_);
          onChanged();
        } else {
          upgradeLevelsBuilder_.addAllMessages(values);
        }
        return this;
      }