docs: public synchronized BloomUpdate getUpdateFlag() {
          if (nFlags == 0)
              return BloomUpdate.UPDATE_NONE;
          else if (nFlags == 1)
              return BloomUpdate.UPDATE_ALL;
          else if (nFlags == 2)
              return BloomUpdate.UPDATE_P2PUBKEY_ONLY;
          else
              throw new IllegalStateException("Unknown flag combination");
      }