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52 lines
1.5 KiB
52 lines
1.5 KiB
4 years ago
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using MessagePack.Formatters;
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using System;
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using System.Reflection;
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using System.Linq; // require UNITY_WSA
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namespace MessagePack.Resolvers
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{
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/// <summary>
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/// Get formatter from [MessaegPackFromatter] attribute.
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/// </summary>
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public sealed class AttributeFormatterResolver : IFormatterResolver
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{
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public static IFormatterResolver Instance = new AttributeFormatterResolver();
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AttributeFormatterResolver()
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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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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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#if UNITY_WSA && !NETFX_CORE
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var attr = (MessagePackFormatterAttribute)typeof(T).GetCustomAttributes(typeof(MessagePackFormatterAttribute), true).FirstOrDefault();
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#else
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var attr = typeof(T).GetTypeInfo().GetCustomAttribute<MessagePackFormatterAttribute>();
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#endif
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if (attr == null)
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{
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return;
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}
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if (attr.Arguments == null)
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{
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formatter = (IMessagePackFormatter<T>)Activator.CreateInstance(attr.FormatterType);
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}
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else
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{
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formatter = (IMessagePackFormatter<T>)Activator.CreateInstance(attr.FormatterType, attr.Arguments);
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}
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}
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}
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}
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}
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