74 lines
2.3 KiB
C#
74 lines
2.3 KiB
C#
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// Copyright (c) All contributors. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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using System;
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using System.Reflection;
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using MessagePack.Formatters;
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using MessagePack.Internal;
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namespace MessagePack.Resolvers
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{
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public sealed class DynamicEnumAsStringResolver : IFormatterResolver
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{
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/// <summary>
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/// The singleton instance that can be used.
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/// </summary>
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public static readonly DynamicEnumAsStringResolver Instance;
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/// <summary>
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/// A <see cref="MessagePackSerializerOptions"/> instance with this formatter pre-configured.
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/// </summary>
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public static readonly MessagePackSerializerOptions Options;
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static DynamicEnumAsStringResolver()
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{
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Instance = new DynamicEnumAsStringResolver();
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Options = new MessagePackSerializerOptions(Instance);
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}
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private DynamicEnumAsStringResolver()
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{
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}
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public IMessagePackFormatter<T> GetFormatter<T>()
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{
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return FormatterCache<T>.Formatter;
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}
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private static class FormatterCache<T>
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{
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public static readonly IMessagePackFormatter<T> Formatter;
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static FormatterCache()
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{
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TypeInfo ti = typeof(T).GetTypeInfo();
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if (ti.IsNullable())
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{
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// build underlying type and use wrapped formatter.
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ti = ti.GenericTypeArguments[0].GetTypeInfo();
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if (!ti.IsEnum)
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{
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return;
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}
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var innerFormatter = DynamicEnumAsStringResolver.Instance.GetFormatterDynamic(ti.AsType());
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if (innerFormatter == null)
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{
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return;
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}
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Formatter = (IMessagePackFormatter<T>)Activator.CreateInstance(typeof(StaticNullableFormatter<>).MakeGenericType(ti.AsType()), new object[] { innerFormatter });
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return;
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}
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else if (!ti.IsEnum)
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{
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return;
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}
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Formatter = (IMessagePackFormatter<T>)(object)new EnumAsStringFormatter<T>();
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}
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}
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}
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}
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