EnumUtils
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Reflection;
namespace Newtonsoft.Json.Utilities
{
internal static class EnumUtils
{
public static IList<T> GetFlagsValues<T>(T value) where T : struct
{
Type typeFromHandle = typeof(T);
if (!typeFromHandle.IsDefined(typeof(FlagsAttribute), false))
throw new ArgumentException("Enum type {0} is not a set of flags.".FormatWith(CultureInfo.InvariantCulture, typeFromHandle));
Type underlyingType = Enum.GetUnderlyingType(value.GetType());
ulong num = Convert.ToUInt64(value, CultureInfo.InvariantCulture);
IList<EnumValue<ulong>> namesAndValues = GetNamesAndValues<T>();
IList<T> list = new List<T>();
foreach (EnumValue<ulong> item in (IEnumerable<EnumValue<ulong>>)namesAndValues) {
if ((num & item.Value) == item.Value && item.Value != 0)
((ICollection<T>)list).Add((T)Convert.ChangeType(item.Value, underlyingType, CultureInfo.CurrentCulture));
}
if (((ICollection<T>)list).Count == 0 && namesAndValues.SingleOrDefault((EnumValue<ulong> v) => v.Value == 0) != null)
((ICollection<T>)list).Add(default(T));
return list;
}
public static IList<EnumValue<ulong>> GetNamesAndValues<T>() where T : struct
{
return GetNamesAndValues<ulong>(typeof(T));
}
public static IList<EnumValue<TUnderlyingType>> GetNamesAndValues<TUnderlyingType>(Type enumType) where TUnderlyingType : struct
{
if (enumType == (Type)null)
throw new ArgumentNullException("enumType");
ValidationUtils.ArgumentTypeIsEnum(enumType, "enumType");
IList<object> values = GetValues(enumType);
IList<string> names = GetNames(enumType);
IList<EnumValue<TUnderlyingType>> list = new List<EnumValue<TUnderlyingType>>();
for (int i = 0; i < ((ICollection<object>)values).Count; i++) {
try {
((ICollection<EnumValue<TUnderlyingType>>)list).Add(new EnumValue<TUnderlyingType>(names[i], (TUnderlyingType)Convert.ChangeType(values[i], typeof(TUnderlyingType), CultureInfo.CurrentCulture)));
} catch (OverflowException innerException) {
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Value from enum with the underlying type of {0} cannot be added to dictionary with a value type of {1}. Value was too large: {2}", new object[3] {
Enum.GetUnderlyingType(enumType),
typeof(TUnderlyingType),
Convert.ToUInt64(values[i], CultureInfo.InvariantCulture)
}), innerException);
}
}
return list;
}
public static IList<object> GetValues(Type enumType)
{
if (!enumType.IsEnum())
throw new ArgumentException("Type '" + enumType.Name + "' is not an enum.");
List<object> list = new List<object>();
IEnumerable<FieldInfo> enumerable = from field in enumType.GetFields()
where field.IsLiteral
select field;
foreach (FieldInfo item in enumerable) {
object value = item.GetValue(enumType);
list.Add(value);
}
return list;
}
public static IList<string> GetNames(Type enumType)
{
if (!enumType.IsEnum())
throw new ArgumentException("Type '" + enumType.Name + "' is not an enum.");
List<string> list = new List<string>();
IEnumerable<FieldInfo> enumerable = from field in enumType.GetFields()
where field.IsLiteral
select field;
foreach (FieldInfo item in enumerable) {
list.Add(item.Name);
}
return list;
}
}
}