public Builder mergeSelf(org.bwapi.proxy.messages.GameMessages.UnitId value) {
        if (selfBuilder_ == null) {
          if (((bitField0_ & 0x00000002) == 0x00000002) &&
              self_ != org.bwapi.proxy.messages.GameMessages.UnitId.getDefaultInstance()) {
            self_ =
              org.bwapi.proxy.messages.GameMessages.UnitId.newBuilder(self_).mergeFrom(value).buildPartial();
          } else {
            self_ = value;
          }
          onChanged();
        } else {
          selfBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000002;
        return this;
      }