mirror of https://github.com/dahall/Vanara.git
218 lines
13 KiB
C#
218 lines
13 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using Vanara.Extensions;
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// ReSharper disable MemberCanBePrivate.Global
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// ReSharper disable UnusedMember.Global
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namespace Vanara.InteropServices
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{
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/// <summary>Actions that can be taken with a corresponding type.</summary>
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[Flags]
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public enum CorrespondingAction
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{
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/// <summary>No actions may be taken.</summary>
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None = 0,
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/// <summary>The type can be retrieved.</summary>
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Get = 1,
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/// <summary>The type can be set.</summary>
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Set = 2,
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/// <summary>The type can be retrieved and set.</summary>
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GetSet = 3,
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/// <summary>Throw a <see cref="Exception"/> if this enumeration value is used.</summary>
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Exception = 4
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}
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/// <summary>
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/// Attribute for enum values that provides information about corresponding types and related actions. Useful for Get/Set methods that
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/// use an enumeration value to determine the type to get or set.
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/// </summary>
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/// <seealso cref="System.Attribute"/>
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[AttributeUsage(AttributeTargets.Field | AttributeTargets.Class | AttributeTargets.Property, AllowMultiple = true)]
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public class CorrespondingTypeAttribute : Attribute
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{
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/// <summary>Initializes a new instance of the <see cref="CorrespondingTypeAttribute"/> class.</summary>
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/// <param name="typeRef">The type that corresponds to this enumeration value.</param>
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/// <param name="action">The actions allowed for the type.</param>
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public CorrespondingTypeAttribute(Type typeRef, CorrespondingAction action = CorrespondingAction.GetSet)
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{
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TypeRef = typeRef;
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Action = action;
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}
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/// <summary>Initializes a new instance of the <see cref="CorrespondingTypeAttribute"/> class.</summary>
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/// <param name="action">The actions allowed for the type.</param>
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public CorrespondingTypeAttribute(CorrespondingAction action) => Action = action;
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/// <summary>Gets the action allowed for the type.</summary>
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/// <value>The action allowed for the type.</value>
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public CorrespondingAction Action { get; }
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/// <summary>Gets the type that corresponds to this enumeration value.</summary>
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/// <value>The type that corresponds to this enumeration value.</value>
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public Type TypeRef { get; }
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/// <summary>Determines whether this instance can get the type for the specified enum value or class.</summary>
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/// <param name="value">The enumeration value or class instance.</param>
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/// <param name="typeRef">The type supplied by the user to validate.</param>
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/// <returns><c>true</c> if this instance can get the specified type; otherwise, <c>false</c>.</returns>
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public static bool CanGet(object value, Type typeRef) => GetAttrForObj(value).Any(a => a.Action.IsFlagSet(CorrespondingAction.Get) && a.TypeRef == typeRef);
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/// <summary>Determines whether this instance can get the type for the specified enum type.</summary>
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/// <param name="value">The enumeration type.</param>
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/// <param name="typeRef">The type supplied by the user to validate.</param>
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/// <returns><c>true</c> if this instance can get the specified type; otherwise, <c>false</c>.</returns>
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public static bool CanGet<TEnum>(TEnum value, Type typeRef) where TEnum : System.Enum => GetAttrForEnum(value, CorrespondingAction.Get).Any(a => a.TypeRef == typeRef);
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/// <summary>Determines whether this type can get the specified reference type.</summary>
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/// <param name="type">The class type.</param>
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/// <param name="typeRef">The type supplied by the user to validate.</param>
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/// <returns><c>true</c> if this type can get the specified reference type; otherwise, <c>false</c>.</returns>
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public static bool CanGet(Type type, Type typeRef) => GetAttrForType(type).Any(a => a.Action.IsFlagSet(CorrespondingAction.Get) && a.TypeRef == typeRef);
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/// <summary>Determines whether an enum value exists that supports a corresponding type of <typeparamref name="T"/>.</summary>
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/// <typeparam name="T">The corresponding type to look for.</typeparam>
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/// <typeparam name="TEnum">The type of the enum.</typeparam>
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/// <param name="value">The value of type <typeparamref name="TEnum"/> that has the corresponding type <typeparamref name="T"/>.</param>
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/// <returns><see langword="true"/> if this instance can get the specified value; otherwise, <see langword="false"/>.</returns>
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public static bool CanGet<T, TEnum>(out TEnum value) where TEnum : struct, System.Enum => CanGet(typeof(T), out value);
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/// <summary>Determines whether an enum value exists that supports a corresponding type of <paramref name="typeRef"/>.</summary>
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/// <typeparam name="TEnum">The type of the enum.</typeparam>
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/// <param name="typeRef">The corresponding type to look for.</param>
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/// <param name="value">The value of type <typeparamref name="TEnum"/> that has the corresponding type <paramref name="typeRef"/>.</param>
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/// <returns><see langword="true"/> if this instance can get the specified value; otherwise, <see langword="false"/>.</returns>
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public static bool CanGet<TEnum>(Type typeRef, out TEnum value) where TEnum : struct, System.Enum
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{
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foreach (TEnum v in Enum.GetValues(typeof(TEnum)))
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{
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if (CanGet(v, typeRef))
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{
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value = v;
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return true;
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}
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}
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value = default;
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return false;
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}
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/// <summary>Determines whether an enum value exists that supports a corresponding type of <typeparamref name="T"/>.</summary>
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/// <typeparam name="T">The corresponding type to look for.</typeparam>
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/// <typeparam name="TEnum">The type of the enum.</typeparam>
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/// <param name="input">If not <see langword="null"/>, the enumeration value to check.</param>
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/// <param name="value">The value of type <typeparamref name="TEnum"/> that has the corresponding type <typeparamref name="T"/>.</param>
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/// <returns><see langword="true"/> if this instance can get the specified value; otherwise, <see langword="false"/>.</returns>
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public static bool CanGet<T, TEnum>(TEnum? input, out TEnum value) where TEnum : struct, System.Enum =>
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input.HasValue ? CanGet(value = input.Value, typeof(T)) : CanGet<T, TEnum>(out value);
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/// <summary>Determines whether this instance can set the type for the specified enum value or class.</summary>
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/// <param name="value">The enumeration value or class instance.</param>
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/// <param name="typeRef">The type supplied by the user to validate.</param>
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/// <returns><c>true</c> if this instance can set the specified type; otherwise, <c>false</c>.</returns>
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public static bool CanSet(object value, Type typeRef) => GetAttrForObj(value).Any(a => a.Action.IsFlagSet(CorrespondingAction.Set) && a.TypeRef == typeRef);
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/// <summary>Determines whether this instance can set the type for the specified enum value or class.</summary>
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/// <param name="value">The enumeration value or class instance.</param>
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/// <param name="typeRef">The type supplied by the user to validate.</param>
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/// <returns><c>true</c> if this instance can set the specified type; otherwise, <c>false</c>.</returns>
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public static bool CanSet<TEnum>(TEnum value, Type typeRef) where TEnum : System.Enum => GetAttrForEnum(value, CorrespondingAction.Set).Any(a => a.TypeRef == typeRef);
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/// <summary>Determines whether this type can set the specified reference type.</summary>
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/// <param name="type">The class type.</param>
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/// <param name="typeRef">The type supplied by the user to validate.</param>
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/// <returns><c>true</c> if this type can set the specified reference type; otherwise, <c>false</c>.</returns>
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public static bool CanSet(Type type, Type typeRef) => GetAttrForType(type).Any(a => a.Action.IsFlagSet(CorrespondingAction.Set) && a.TypeRef == typeRef);
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/// <summary>Determines whether an enum value exists that supports a corresponding type of <typeparamref name="T"/>.</summary>
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/// <typeparam name="T">The corresponding type to look for.</typeparam>
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/// <typeparam name="TEnum">The type of the enum.</typeparam>
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/// <param name="value">The value of type <typeparamref name="TEnum"/> that has the corresponding type <typeparamref name="T"/>.</param>
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/// <returns><see langword="true"/> if this instance can get the specified value; otherwise, <see langword="false"/>.</returns>
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public static bool CanSet<T, TEnum>(out TEnum value) where TEnum : struct, System.Enum => CanSet(typeof(T), out value);
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/// <summary>Determines whether an enum value exists that supports a corresponding type of <paramref name="typeRef"/>.</summary>
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/// <typeparam name="TEnum">The type of the enum.</typeparam>
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/// <param name="typeRef">The type supplied by the user to validate.</param>
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/// <param name="value">The value of type <typeparamref name="TEnum"/> that has the corresponding type <paramref name="typeRef"/>.</param>
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/// <returns><see langword="true"/> if this instance can get the specified value; otherwise, <see langword="false"/>.</returns>
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public static bool CanSet<TEnum>(Type typeRef, out TEnum value) where TEnum : struct, System.Enum
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{
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foreach (TEnum v in Enum.GetValues(typeof(TEnum)))
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{
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if (CanSet(v, typeRef))
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{
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value = v;
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return true;
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}
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}
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value = default;
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return false;
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}
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/// <summary>Gets the corresponding types for the supplied enumeration value.</summary>
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/// <param name="enumValue">The class or structure instance.</param>
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/// <returns>The types defined by the attribute.</returns>
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public static IEnumerable<Type> GetCorrespondingTypes(object enumValue) => GetAttrForObj(enumValue).Select(a => a.TypeRef);
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/// <summary>Gets the corresponding types for the supplied enumeration value.</summary>
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/// <param name="enumValue">The enumeration value.</param>
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/// <returns>The types defined by the attribute.</returns>
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public static IEnumerable<Type> GetCorrespondingTypes<TEnum>(TEnum enumValue) where TEnum : System.Enum => GetAttrForEnum(enumValue).Select(a => a.TypeRef);
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/// <summary>Gets the corresponding types for the supplied enumeration value.</summary>
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/// <param name="enumValue">The enumeration value.</param>
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/// <param name="action">The action to filter for.</param>
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/// <returns>The types defined by the attribute.</returns>
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public static IEnumerable<Type> GetCorrespondingTypes<TEnum>(TEnum enumValue, CorrespondingAction action) where TEnum : System.Enum => GetAttrForEnum(enumValue, action).Select(a => a.TypeRef);
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/// <summary>Gets the corresponding types for the supplied enumeration value.</summary>
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/// <param name="type">The class type.</param>
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/// <returns>The types defined by the attribute.</returns>
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public static IEnumerable<Type> GetCorrespondingTypes(Type type) => GetAttrForType(type).Select(a => a.TypeRef);
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/// <summary>Gets the CorrespondingTypeAttribute instances associated with an enum value.</summary>
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/// <typeparam name="TEnum">The type of the enum.</typeparam>
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/// <param name="value">The enum value.</param>
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/// <param name="action">The action to filter for.</param>
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/// <returns>An enumeration of all associated CorrespondingTypeAttribute instances.</returns>
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protected static IEnumerable<CorrespondingTypeAttribute> GetAttrForEnum<TEnum>(TEnum value, CorrespondingAction action = (CorrespondingAction)0xf) where TEnum : System.Enum
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{
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var valueType = value.GetType();
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var attr = valueType.GetField(value.ToString()).GetCustomAttributes<CorrespondingTypeAttribute>(false, a => (a.Action & action) > 0);
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if (attr.Any(a => a.Action == CorrespondingAction.Exception)) throw new Exception();
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//if (!attr.Any()) return new CorrespondingTypeAttribute[0];
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return attr;
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}
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/// <summary>Gets the CorrespondingTypeAttribute instances associated with an enum value or class instance.</summary>
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/// <param name="value">The enum value or class instance.</param>
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/// <returns>An enumeration of all associated CorrespondingTypeAttribute instances.</returns>
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protected static IEnumerable<CorrespondingTypeAttribute> GetAttrForObj(object value)
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{
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if (value is null) throw new ArgumentNullException(nameof(value));
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var valueType = value.GetType();
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if (!valueType.IsEnum && !valueType.IsClass) throw new ArgumentException("Value must be an enumeration or class value.", nameof(value));
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var attr = valueType.IsEnum ? valueType.GetField(value.ToString()).GetCustomAttributes<CorrespondingTypeAttribute>() : valueType.GetCustomAttributes<CorrespondingTypeAttribute>();
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if (!attr.Any()) return new CorrespondingTypeAttribute[0];
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if (attr.Any(a => a.Action == CorrespondingAction.Exception)) throw new Exception();
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return attr;
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}
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/// <summary>Gets the CorrespondingTypeAttribute instances associated with a type.</summary>
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/// <param name="type">The type.</param>
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/// <returns>An enumeration of all associated CorrespondingTypeAttribute instances.</returns>
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protected static IEnumerable<CorrespondingTypeAttribute> GetAttrForType(Type type)
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{
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if (type == null) throw new ArgumentNullException(nameof(type));
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var attr = type.GetCustomAttributes<CorrespondingTypeAttribute>();
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if (!attr.Any()) return new CorrespondingTypeAttribute[0];
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if (attr.Any(a => a.Action == CorrespondingAction.Exception)) throw new Exception();
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return attr;
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}
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}
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} |