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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;
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 enumType = typeof(T);
if (!enumType.IsDefined(typeof(FlagsAttribute), false))
throw new Exception("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);
EnumValues<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));
return selectedFlagsValues;
}
/// <summary>
/// Gets a dictionary of the names and values of an Enum type.
/// </summary>
/// <returns></returns>
public static EnumValues<ulong> GetNamesAndValues<T>() where T : struct
{
return GetNamesAndValues<ulong>(typeof(T));
}
/// <summary>
/// Gets a dictionary of the names and values of an Enum type.
/// </summary>
/// <param name="enumType">The enum type to get names and values for.</param>
/// <returns></returns>
public static EnumValues<TUnderlyingType> GetNamesAndValues<TUnderlyingType>(Type enumType) where TUnderlyingType : struct
{
if (enumType == null)
throw new ArgumentNullException("enumType");
ValidationUtils.ArgumentTypeIsEnum(enumType, "enumType");
IList<object> enumValues = GetValues(enumType);
IList<string> enumNames = GetNames(enumType);
EnumValues<TUnderlyingType> nameValues = new EnumValues<TUnderlyingType>();
for (int i = 0; i < enumValues.Count; i++)
{
try
{
nameValues.Add(new EnumValue<TUnderlyingType>(enumNames[i], (TUnderlyingType)Convert.ChangeType(enumValues[i], typeof(TUnderlyingType), CultureInfo.CurrentCulture)));
}
catch (OverflowException e)
{
throw new Exception(
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}",
Enum.GetUnderlyingType(enumType), typeof(TUnderlyingType), Convert.ToUInt64(enumValues[i], CultureInfo.InvariantCulture)), e);
}
}
return nameValues;
}
public static IList<object> GetValues(Type enumType)
{
if (!enumType.IsEnum())
throw new ArgumentException("Type '" + enumType.Name + "' is not an enum.");
List<object> values = new List<object>();
var fields = from field in enumType.GetFields()
where field.IsLiteral
select field;
foreach (FieldInfo field in fields)
{
object value = field.GetValue(enumType);
values.Add(value);
}
return values;
}
public static IList<string> GetNames(Type enumType)
{
if (!enumType.IsEnum())
throw new ArgumentException("Type '" + enumType.Name + "' is not an enum.");
List<string> values = new List<string>();
var fields = from field in enumType.GetFields()
where field.IsLiteral
select field;
foreach (FieldInfo field in fields)
{
values.Add(field.Name);
}
return values;
}
}
}
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