public Builder mergeOrderTarget(org.bwapi.proxy.messages.GameMessages.UnitId value) {
        if (orderTargetBuilder_ == null) {
          if (((bitField1_ & 0x00000008) == 0x00000008) &&
              orderTarget_ != org.bwapi.proxy.messages.GameMessages.UnitId.getDefaultInstance()) {
            orderTarget_ =
              org.bwapi.proxy.messages.GameMessages.UnitId.newBuilder(orderTarget_).mergeFrom(value).buildPartial();
          } else {
            orderTarget_ = value;
          }
          onChanged();
        } else {
          orderTargetBuilder_.mergeFrom(value);
        }
        bitField1_ |= 0x00000008;
        return this;
      }