static String toString()

in src/main/java/org/apache/datasketches/hll/PreambleUtil.java [159:251]
84 lines of code
11 McCabe index (conditional complexity)

  static String toString(final Memory mem) {
    //First 8 bytes
    final int preInts = mem.getByte(PREAMBLE_INTS_BYTE);
    final int serVer = mem.getByte(SER_VER_BYTE);
    final Family family = Family.idToFamily(mem.getByte(FAMILY_BYTE));
    final int lgK = mem.getByte(LG_K_BYTE);
    final int lgArr = mem.getByte(LG_ARR_BYTE);
    final int flags = mem.getByte(FLAGS_BYTE);
    //Flags
    final String flagsStr = zeroPad(Integer.toBinaryString(flags), 8) + ", " + (flags);
    final boolean bigEndian = (flags & BIG_ENDIAN_FLAG_MASK) > 0;
    final String nativeOrder = ByteOrder.nativeOrder().toString();
    final boolean compact = (flags & COMPACT_FLAG_MASK) > 0;
    final boolean oooFlag = (flags & OUT_OF_ORDER_FLAG_MASK) > 0;
    final boolean readOnly = (flags & READ_ONLY_FLAG_MASK) > 0;
    final boolean empty = (flags & EMPTY_FLAG_MASK) > 0;
    final boolean rebuildKxQ = (flags & REBUILD_CURMIN_NUM_KXQ_MASK) > 0;

    final int hllCurMin = mem.getByte(HLL_CUR_MIN_BYTE);
    final int listCount = hllCurMin;
    final int modeByte = mem.getByte(MODE_BYTE);
    final CurMode curMode = CurMode.fromOrdinal(modeByte & 3);
    final TgtHllType tgtHllType = TgtHllType.fromOrdinal((modeByte >>> 2) & 3);

    double hipAccum = 0;
    double kxq0 = 0;
    double kxq1 = 0;
    int hashSetCount = 0;
    int curMinCount = 0;
    int exceptionCount = 0;

    if (curMode == CurMode.SET) {
      hashSetCount = mem.getInt(HASH_SET_COUNT_INT);
    }
    else if (curMode == CurMode.HLL) {
      hipAccum = mem.getDouble(HIP_ACCUM_DOUBLE);
      kxq0 = mem.getDouble(KXQ0_DOUBLE);
      kxq1 = mem.getDouble(KXQ1_DOUBLE);
      curMinCount = mem.getInt(CUR_MIN_COUNT_INT);
      exceptionCount = mem.getInt(AUX_COUNT_INT);
    }

    final StringBuilder sb = new StringBuilder();
    sb.append(LS);
    sb.append("### HLL SKETCH PREAMBLE:").append(LS);
    sb.append("Byte 0: Preamble Ints         : ").append(preInts).append(LS);
    sb.append("Byte 1: SerVer                : ").append(serVer).append(LS);
    sb.append("Byte 2: Family                : ").append(family).append(LS);
    sb.append("Byte 3: lgK                   : ").append(lgK).append(LS);
    //expand byte 4: LgArr
    if (curMode == CurMode.LIST) {
      sb.append("Byte 4: LgArr: List Arr       : ").append(lgArr).append(LS);
    }
    if (curMode == CurMode.SET) {
      sb.append("Byte 4: LgArr: Hash Set Arr   : ").append(lgArr).append(LS);
    }
    if (curMode == CurMode.HLL) {
      sb.append("Byte 4: LgArr or Aux LgArr    : ").append(lgArr).append(LS);
    }
    //expand byte 5: Flags
    sb.append("Byte 5: Flags:                : ").append(flagsStr).append(LS);
    sb.append("  BIG_ENDIAN_STORAGE          : ").append(bigEndian).append(LS);
    sb.append("  (Native Byte Order)         : ").append(nativeOrder).append(LS);
    sb.append("  READ_ONLY                   : ").append(readOnly).append(LS);
    sb.append("  EMPTY                       : ").append(empty).append(LS);
    sb.append("  COMPACT                     : ").append(compact).append(LS);
    sb.append("  OUT_OF_ORDER                : ").append(oooFlag).append(LS);
    sb.append("  REBUILD_KXQ                 : ").append(rebuildKxQ).append(LS);
    //expand byte 6: ListCount, CurMin
    if (curMode == CurMode.LIST) {
      sb.append("Byte 6: List Count/CurMin     : ").append(listCount).append(LS);
    }
    if (curMode == CurMode.SET) {
      sb.append("Byte 6: (not used)            : ").append(LS);
    }
    if (curMode == CurMode.HLL) {
      sb.append("Byte 6: Cur Min               : ").append(hllCurMin).append(LS);
    }
    final String modes = curMode.toString() + ", " + tgtHllType.toString();
    sb.append("Byte 7: Mode                  : ").append(modes).append(LS);
    if (curMode == CurMode.SET) {
      sb.append("Hash Set Count                : ").append(hashSetCount).append(LS);
    }
    if (curMode == CurMode.HLL) {
      sb.append("HIP Accum                     : ").append(hipAccum).append(LS);
      sb.append("KxQ0                          : ").append(kxq0).append(LS);
      sb.append("KxQ1                          : ").append(kxq1).append(LS);
      sb.append("Num At Cur Min                : ").append(curMinCount).append(LS);
      sb.append("Aux Count                     : ").append(exceptionCount).append(LS);
    }
    sb.append("### END HLL SKETCH PREAMBLE").append(LS);
    return sb.toString();
  }