private static CompactSketch wrap()

in src/main/java/org/apache/datasketches/theta/CompactSketch.java [286:326]
40 lines of code
13 McCabe index (conditional complexity)

  private static CompactSketch wrap(final byte[] bytes, final long seed, final boolean enforceSeed) {
    final int serVer = bytes[PreambleUtil.SER_VER_BYTE];
    final int familyId = bytes[PreambleUtil.FAMILY_BYTE];
    final Family family = Family.idToFamily(familyId);
    if (family != Family.COMPACT) {
      throw new IllegalArgumentException("Corrupted: " + family + " is not Compact!");
    }
    final short seedHash = ThetaUtil.computeSeedHash(seed);
    if (serVer == 4) {
      return WrappedCompactCompressedSketch.wrapInstance(bytes, seedHash);
    } else if (serVer == 3) {
      final int flags = bytes[FLAGS_BYTE];
      if ((flags & EMPTY_FLAG_MASK) > 0) {
        return EmptyCompactSketch.getHeapInstance(Memory.wrap(bytes));
      }
      final int preLongs = bytes[PREAMBLE_LONGS_BYTE];
      if (otherCheckForSingleItem(preLongs, serVer, familyId, flags)) {
        return SingleItemSketch.heapify(Memory.wrap(bytes), enforceSeed ? seedHash : getShortLE(bytes, SEED_HASH_SHORT));
      }
      //not empty & not singleItem
      final boolean compactFlag = (flags & COMPACT_FLAG_MASK) > 0;
      if (!compactFlag) {
        throw new SketchesArgumentException(
            "Corrupted: COMPACT family sketch image must have compact flag set");
      }
      final boolean readOnly = (flags & READ_ONLY_FLAG_MASK) > 0;
      if (!readOnly) {
        throw new SketchesArgumentException(
            "Corrupted: COMPACT family sketch image must have Read-Only flag set");
      }
      return WrappedCompactSketch.wrapInstance(bytes,
          enforceSeed ? seedHash : getShortLE(bytes, SEED_HASH_SHORT));
    } else if (serVer == 1) {
      return ForwardCompatibility.heapify1to3(Memory.wrap(bytes), seedHash);
    } else if (serVer == 2) {
      return ForwardCompatibility.heapify2to3(Memory.wrap(bytes),
          enforceSeed ? seedHash : getShortLE(bytes, SEED_HASH_SHORT));
    }
    throw new SketchesArgumentException(
        "Corrupted: Serialization Version " + serVer + " not recognized.");
  }