private static void UpdateVarLen()

in cs/src/core/Index/FASTER/FASTER.cs [760:827]
61 lines of code
27 McCabe index (conditional complexity)

        private static void UpdateVarLen(ref VariableLengthStructSettings<Key, Value> variableLengthStructSettings)
        {
            if (typeof(Key) == typeof(SpanByte))
            {
                if (variableLengthStructSettings == null)
                    variableLengthStructSettings = new VariableLengthStructSettings<SpanByte, Value>() as VariableLengthStructSettings<Key, Value>;

                if (variableLengthStructSettings.keyLength == null)
                    (variableLengthStructSettings as VariableLengthStructSettings<SpanByte, Value>).keyLength = new SpanByteVarLenStruct();
            }
            else if (typeof(Key).IsGenericType && (typeof(Key).GetGenericTypeDefinition() == typeof(Memory<>)) && Utility.IsBlittableType(typeof(Key).GetGenericArguments()[0]))
            {
                if (variableLengthStructSettings == null)
                    variableLengthStructSettings = new VariableLengthStructSettings<Key, Value>();

                if (variableLengthStructSettings.keyLength == null)
                {
                    var m = typeof(MemoryVarLenStruct<>).MakeGenericType(typeof(Key).GetGenericArguments());
                    object o = Activator.CreateInstance(m);
                    variableLengthStructSettings.keyLength = o as IVariableLengthStruct<Key>;
                }
            }
            else if (typeof(Key).IsGenericType && (typeof(Key).GetGenericTypeDefinition() == typeof(ReadOnlyMemory<>)) && Utility.IsBlittableType(typeof(Key).GetGenericArguments()[0]))
            {
                if (variableLengthStructSettings == null)
                    variableLengthStructSettings = new VariableLengthStructSettings<Key, Value>();

                if (variableLengthStructSettings.keyLength == null)
                {
                    var m = typeof(ReadOnlyMemoryVarLenStruct<>).MakeGenericType(typeof(Key).GetGenericArguments());
                    object o = Activator.CreateInstance(m);
                    variableLengthStructSettings.keyLength = o as IVariableLengthStruct<Key>;
                }
            }

            if (typeof(Value) == typeof(SpanByte))
            {
                if (variableLengthStructSettings == null)
                    variableLengthStructSettings = new VariableLengthStructSettings<Key, SpanByte>() as VariableLengthStructSettings<Key, Value>;

                if (variableLengthStructSettings.valueLength == null)
                    (variableLengthStructSettings as VariableLengthStructSettings<Key, SpanByte>).valueLength = new SpanByteVarLenStruct();
            }
            else if (typeof(Value).IsGenericType && (typeof(Value).GetGenericTypeDefinition() == typeof(Memory<>)) && Utility.IsBlittableType(typeof(Value).GetGenericArguments()[0]))
            {
                if (variableLengthStructSettings == null)
                    variableLengthStructSettings = new VariableLengthStructSettings<Key, Value>();

                if (variableLengthStructSettings.valueLength == null)
                {
                    var m = typeof(MemoryVarLenStruct<>).MakeGenericType(typeof(Value).GetGenericArguments());
                    object o = Activator.CreateInstance(m);
                    variableLengthStructSettings.valueLength = o as IVariableLengthStruct<Value>;
                }
            }
            else if (typeof(Value).IsGenericType && (typeof(Value).GetGenericTypeDefinition() == typeof(ReadOnlyMemory<>)) && Utility.IsBlittableType(typeof(Value).GetGenericArguments()[0]))
            {
                if (variableLengthStructSettings == null)
                    variableLengthStructSettings = new VariableLengthStructSettings<Key, Value>();

                if (variableLengthStructSettings.valueLength == null)
                {
                    var m = typeof(ReadOnlyMemoryVarLenStruct<>).MakeGenericType(typeof(Value).GetGenericArguments());
                    object o = Activator.CreateInstance(m);
                    variableLengthStructSettings.valueLength = o as IVariableLengthStruct<Value>;
                }
            }
        }