icdsystems/ICD.Common.Utils
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refactor: Reworking EnumUtils to rely less on casting back and forth to int, added method for getting enum names

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This commit is contained in:
Chris Cameron
2020-04-13 14:49:57 -04:00
parent 5e61098e71
commit 79344a3667
2 changed files with 188 additions and 133 deletions
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181
ICD.Common.Utils/EnumUtils.cs
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@@ -13,16 +13,16 @@ namespace ICD.Common.Utils
{
public static class EnumUtils
{
private static readonly Dictionary<Type, object> s_EnumValuesCache;
private static readonly Dictionary<Type, Dictionary<int, object>> s_EnumFlagsCache;
private static readonly Dictionary<Type, object[]> s_EnumValuesCache;
private static readonly Dictionary<Type, Dictionary<object, object[]>> s_EnumFlagsCache;
/// <summary>
/// Static constructor.
/// </summary>
static EnumUtils()
{
s_EnumValuesCache = new Dictionary<Type, object>();
s_EnumFlagsCache = new Dictionary<Type, Dictionary<int, object>>();
s_EnumValuesCache = new Dictionary<Type, object[]>();
s_EnumFlagsCache = new Dictionary<Type, Dictionary<object, object[]>>();
}
#region Validation
@@ -58,7 +58,6 @@ namespace ICD.Common.Utils
/// <returns></returns>
public static bool IsEnum<T>(T value)
{
// ReSharper disable once CompareNonConstrainedGenericWithNull
return value != null && IsEnumType(value.GetType());
}
@@ -123,6 +122,30 @@ namespace ICD.Common.Utils
#region Values
/// <summary>
/// Gets the names of the values in the enumeration.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static IEnumerable<string> GetNames<T>()
where T : struct, IConvertible
{
return GetNames(typeof(T));
}
/// <summary>
/// Gets the names of the values in the enumeration.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static IEnumerable<string> GetNames([NotNull] Type type)
{
if (type == null)
throw new ArgumentNullException("type");
return GetValues(type).Select(v => v.ToString());
}
/// <summary>
/// Gets the values from an enumeration.
/// </summary>
@@ -131,46 +154,51 @@ namespace ICD.Common.Utils
public static IEnumerable<T> GetValues<T>()
where T : struct, IConvertible
{
Type type = typeof(T);
// Reflection is slow and this method is called a lot, so we cache the results.
object cache;
if (!s_EnumValuesCache.TryGetValue(type, out cache))
{
cache = GetValuesUncached<T>().ToArray();
s_EnumValuesCache[type] = cache;
}
return cache as T[];
return GetValues(typeof(T)).Cast<T>();
}
/// <summary>
/// Gets the values from an enumeration without performing any caching. This is slow because of reflection.
/// Gets the values from an enumeration.
/// </summary>
/// <returns></returns>
public static IEnumerable<int> GetValues(Type type)
public static IEnumerable<object> GetValues(Type type)
{
if (type == null)
throw new ArgumentNullException("type");
return GetValuesUncached(type);
// Reflection is slow and this method is called a lot, so we cache the results.
return s_EnumValuesCache.GetOrAddNew(type, () => GetValuesUncached(type).ToArray());
}
/// <summary>
/// Gets the values from an enumeration without performing any caching. This is slow because of reflection.
/// Gets the values from an enumeration except the 0 value.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
private static IEnumerable<T> GetValuesUncached<T>()
public static IEnumerable<T> GetValuesExceptNone<T>()
where T : struct, IConvertible
{
return GetValuesUncached(typeof(T)).Select(i => (T)(object)i);
return GetValuesExceptNone(typeof(T)).Cast<T>();
}
/// <summary>
/// Gets the values from an enumeration except the 0 value.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static IEnumerable<object> GetValuesExceptNone([NotNull] Type type)
{
if (type == null)
throw new ArgumentNullException("type");
return GetFlagsExceptNone(type);
}
/// <summary>
/// Gets the values from an enumeration without performing any caching. This is slow because of reflection.
/// </summary>
/// <returns></returns>
private static IEnumerable<int> GetValuesUncached(Type type)
private static IEnumerable<object> GetValuesUncached(Type type)
{
if (type == null)
throw new ArgumentNullException("type");
@@ -182,34 +210,10 @@ namespace ICD.Common.Utils
#if SIMPLSHARP
.GetCType()
#else
.GetTypeInfo()
.GetTypeInfo()
#endif
.GetFields(BindingFlags.Static | BindingFlags.Public)
.Select(x => x.GetValue(null))
.Cast<int>();
}
/// <summary>
/// Gets the values from an enumeration except the 0 value.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static IEnumerable<T> GetValuesExceptNone<T>()
where T : struct, IConvertible
{
return GetFlagsExceptNone<T>();
}
/// <summary>
/// Gets the values from an enumeration except the 0 value without performing any caching. This is slow because of reflection.
/// </summary>
/// <returns></returns>
public static IEnumerable<int> GetValuesExceptNone(Type type)
{
if (type == null)
throw new ArgumentNullException("type");
return GetValues(type).Except(0);
.GetFields(BindingFlags.Static | BindingFlags.Public)
.Select(x => x.GetValue(null));
}
#endregion
@@ -330,24 +334,21 @@ namespace ICD.Common.Utils
public static IEnumerable<T> GetFlags<T>(T value)
where T : struct, IConvertible
{
Type type = typeof(T);
int valueInt = (int)(object)value;
return GetFlags(typeof(T), value).Cast<T>();
}
Dictionary<int, object> cache;
if (!s_EnumFlagsCache.TryGetValue(type, out cache))
{
cache = new Dictionary<int, object>();
s_EnumFlagsCache[type] = cache;
}
object flags;
if (!cache.TryGetValue(valueInt, out flags))
{
flags = GetValues<T>().Where(e => HasFlag(value, e)).ToArray();
cache[valueInt] = flags;
}
return flags as T[];
/// <summary>
/// Gets all of the set flags on the given enum.
/// </summary>
/// <param name="type"></param>
/// <param name="value"></param>
/// <returns></returns>
public static IEnumerable<object> GetFlags(Type type, object value)
{
return s_EnumFlagsCache.GetOrAddNew(type, () => new Dictionary<object, object[]>())
.GetOrAddNew(value, () => GetValues(type)
.Where(f => HasFlag(value, f))
.ToArray());
}
/// <summary>
@@ -358,8 +359,7 @@ namespace ICD.Common.Utils
public static IEnumerable<T> GetFlagsExceptNone<T>()
where T : struct, IConvertible
{
T allValue = GetFlagsAllValue<T>();
return GetFlagsExceptNone(allValue);
return GetFlagsExceptNone(typeof(T)).Cast<T>();
}
/// <summary>
@@ -371,7 +371,35 @@ namespace ICD.Common.Utils
public static IEnumerable<T> GetFlagsExceptNone<T>(T value)
where T : struct, IConvertible
{
return GetFlags(value).Except(default(T));
return GetFlagsExceptNone(typeof(T), value).Cast<T>();
}
/// <summary>
/// Gets all of the set flags on the given enum type except 0.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static IEnumerable<object> GetFlagsExceptNone([NotNull] Type type)
{
if (type == null)
throw new ArgumentNullException("type");
object allValue = GetFlagsAllValue(type);
return GetFlagsExceptNone(type, allValue);
}
/// <summary>
/// Gets all of the set flags on the given enum except 0.
/// </summary>
/// <param name="type"></param>
/// <param name="value"></param>
/// <returns></returns>
public static IEnumerable<object> GetFlagsExceptNone([NotNull] Type type, object value)
{
if (type == null)
throw new ArgumentNullException("type");
return GetFlags(type, value).Where(f => (int)f != 0);
}
/// <summary>
@@ -412,7 +440,7 @@ namespace ICD.Common.Utils
if (type == null)
throw new ArgumentNullException("type");
return GetValuesUncached(type).Aggregate(0, (current, value) => current | value);
return GetValuesUncached(type).Aggregate(0, (current, value) => current | (int)value);
}
/// <summary>
@@ -428,6 +456,17 @@ namespace ICD.Common.Utils
return HasFlags(value, flag);
}
/// <summary>
/// Returns true if the enum contains the given flag.
/// </summary>
/// <param name="value"></param>
/// <param name="flag"></param>
/// <returns></returns>
public static bool HasFlag(object value, object flag)
{
return HasFlag((int)value, (int)flag);
}
/// <summary>
/// Returns true if the enum contains the given flag.
/// </summary>