private static Key UpperUnion()

in EsentCollections/KeyRange.cs [434:478]

• 43 lines of code
• 16 McCabe index (conditional complexity)

        private static Key<T> UpperUnion(Key<T> a, Key<T> b)
        {
            Key<T> max;
            if (null == a || null == b)
            {
                max = null;
            }
            else
            {
                int compare = CompareKeys(a, b);
                if (0 == compare)
                {
                    // Prefer the prefix/inclusive range
                    if (a.IsPrefix || b.IsPrefix)
                    {
                        max = a.IsPrefix ? a : b;
                    }
                    else
                    {
                        max = a.IsInclusive ? a : b;
                    }
                }
                else
                {
                    if (a.IsPrefix && b.IsPrefix)
                    {
                        max = ComparePrefixes(a, b) > 0 ? a : b;
                    }
                    else if (a.IsPrefix)
                    {
                        max = CompareNonPrefixAndPrefix(b, a) > 0 ? b : a;
                    }
                    else if (b.IsPrefix)
                    {
                        max = CompareNonPrefixAndPrefix(a, b) > 0 ? a : b;
                    }
                    else
                    {
                        max = compare > 0 ? a : b;
                    }
                }
            }

            return max;
        }