Newtonsoft.Json/Utilities/EnumUtils.cs

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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Collections.Generic;
using System.Globalization;
#if NET20
using Newtonsoft.Json.Utilities.LinqBridge;
#else
using System.Linq;
#endif
using System.Reflection;

namespace Newtonsoft.Json.Utilities
{
    internal static class EnumUtils
    {
        public static IList<T> GetFlagsValues<T>(T value) where T : struct
        {
            Type enumType = typeof(T);

            if (!enumType.IsDefined(typeof(FlagsAttribute), false))
                throw new ArgumentException("Enum type {0} is not a set of flags.".FormatWith(CultureInfo.InvariantCulture, enumType));

            Type underlyingType = Enum.GetUnderlyingType(value.GetType());

            ulong num = Convert.ToUInt64(value, CultureInfo.InvariantCulture);
            IList<EnumValue<ulong>> enumNameValues = GetNamesAndValues<T>();
            IList<T> selectedFlagsValues = new List<T>();

            foreach (EnumValue<ulong> enumNameValue in enumNameValues)
            {
                if ((num & enumNameValue.Value) == enumNameValue.Value && enumNameValue.Value != 0)
                    selectedFlagsValues.Add((T)Convert.ChangeType(enumNameValue.Value, underlyingType, CultureInfo.CurrentCulture));
            }

            if (selectedFlagsValues.Count == 0 && enumNameValues.SingleOrDefault(v => v.Value == 0) != null)
                selectedFlagsValues.Add(default(T));