static void checkPreLongsFlagsSerVer()

in src/main/java/org/apache/datasketches/quantiles/HeapUpdateDoublesSketch.java [404:431]

• 26 lines of code
• 14 McCabe index (conditional complexity)

  static void checkPreLongsFlagsSerVer(final int flags, final int serVer, final int preLongs) {
    final boolean empty = (flags & EMPTY_FLAG_MASK) > 0;
    final boolean compact = (flags & COMPACT_FLAG_MASK) > 0;

    final int sw = (compact ? 1 : 0) + (2 * (empty ? 1 : 0)) + (4 * (serVer & 0xF))
        + (32 * (preLongs & 0x3F));
    boolean valid = true;
    switch (sw) { //These are the valid cases.
      case 38  : break; //!compact,  empty, serVer = 1, preLongs = 1; always stored as not compact
      case 164 : break; //!compact, !empty, serVer = 1, preLongs = 5; always stored as not compact
      case 42  : break; //!compact,  empty, serVer = 2, preLongs = 1; always stored as compact
      case 72  : break; //!compact, !empty, serVer = 2, preLongs = 2; always stored as compact
      case 47  : break; // compact,  empty, serVer = 3, preLongs = 1;
      case 46  : break; //!compact,  empty, serVer = 3, preLongs = 1;
      case 79  : break; // compact,  empty, serVer = 3, preLongs = 2;
      case 78  : break; //!compact,  empty, serVer = 3, preLongs = 2;
      case 77  : break; // compact, !empty, serVer = 3, preLongs = 2;
      case 76  : break; //!compact, !empty, serVer = 3, preLongs = 2;
      default : //all other cases are invalid
        valid = false;
    }

    if (!valid) {
      throw new SketchesArgumentException("Possible corruption. Inconsistent state: "
          + "PreambleLongs = " + preLongs + ", empty = " + empty + ", SerVer = " + serVer
          + ", Compact = " + compact);
    }
  }