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// --------------------------------------------------------------------------------------------------------------------
// <copyright file="EnumHelper.cs" company="HandBrake Project (http://handbrake.fr)">
// This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
// Enum Helpers
// </summary>
// --------------------------------------------------------------------------------------------------------------------
namespace HandBrake.ApplicationServices.Functions
{
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection;
/// <summary>
/// Enum Helpers
/// </summary>
/// <typeparam name="T">
/// The Type Parameter
/// </typeparam>
public class EnumHelper<T>
{
/// <summary>
/// Get the description of an Enum
/// </summary>
/// <param name="value">
/// The value.
/// </param>
/// <returns>
/// The Description string
/// </returns>
public static string GetDescription(T value)
{
FieldInfo fieldInfo = value.GetType().GetField(value.ToString());
DescriptionAttribute[] attributes =
(DescriptionAttribute[])fieldInfo.GetCustomAttributes(
typeof(DescriptionAttribute), false);
return (attributes.Length > 0) ? attributes[0].Description : value.ToString();
}
/// <summary>
/// Get the Display Value of the Enum Model
/// </summary>
/// <param name="value">An Enum with Display Attributes</param>
/// <returns>A string name</returns>
public static string GetDisplay(T value)
{
FieldInfo fieldInfo = value.GetType().GetField(value.ToString());
DisplayAttribute[] attributes = (DisplayAttribute[])fieldInfo.GetCustomAttributes(typeof(DisplayAttribute), false);
return (attributes.Length > 0) ? attributes[0].Name : value.ToString();
}
/// <summary>
/// Get the Enumeration for a given Enum Description
/// </summary>
/// <param name="description">The String description</param>
/// <returns>The Enum Value</returns>
public static T GetValue(string description)
{
foreach (T val in Enum.GetValues(typeof(T)))
{
string currDescription = GetDescription(val);
string currDisplay = GetDisplay(val);
if (currDescription == description || currDisplay == description)
{
return val;
}
}
throw new ArgumentOutOfRangeException("The Description for the enum was not recognized.");
}
/// <summary>
/// Return a list of all the enum values.
/// </summary>
/// <returns>
/// An Enum Oject List
/// </returns>
public static IEnumerable<T> GetEnumList()
{
return Enum.GetValues(typeof(T)).Cast<T>().ToList();
}
/// <summary>
/// Get a list of string names for each enum value.
/// </summary>
/// <param name="enumType">
/// The enum type.
/// </param>
/// <typeparam name="T">
/// The type of the enum
/// </typeparam>
/// <returns>
/// A collection of strings that represent all the enum values
/// </returns>
public static IEnumerable<string> GetEnumDisplayValues(Type enumType)
{
var strings = new Collection<string>();
foreach (T e in Enum.GetValues(enumType))
strings.Add(GetDisplay(e));
return strings;
}
/// <summary>
/// Get a list of string names for each enum value passed in.
/// </summary>
/// <param name="items">
/// The items.
/// </param>
/// <typeparam name="T">
/// The type of the enum
/// </typeparam>
/// <returns>
/// A collection of strings that represent all the enum values
/// </returns>
public static IEnumerable<string> GetEnumDisplayValuesSubset(IEnumerable<T> items)
{
return items.Select(GetDisplay).ToList();
}
}
}
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