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50 lines
1.5 KiB
50 lines
1.5 KiB
using System;
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using System.ComponentModel;
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using System.Reflection;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace Jellyfin.Extensions.Json.Converters;
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/// <summary>
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/// Json unknown enum converter.
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/// </summary>
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/// <typeparam name="T">The type of enum.</typeparam>
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public class JsonDefaultStringEnumConverter<T> : JsonConverter<T>
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where T : struct, Enum
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{
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private readonly JsonConverter<T> _baseConverter;
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/// <summary>
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/// Initializes a new instance of the <see cref="JsonDefaultStringEnumConverter{T}"/> class.
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/// </summary>
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/// <param name="baseConverter">The base json converter.</param>
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public JsonDefaultStringEnumConverter(JsonConverter<T> baseConverter)
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{
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_baseConverter = baseConverter;
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}
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/// <inheritdoc />
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public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
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{
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if (reader.IsNull() || reader.IsEmptyString())
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{
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var customValueAttribute = typeToConvert.GetCustomAttribute<DefaultValueAttribute>();
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if (customValueAttribute?.Value is null)
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{
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throw new InvalidOperationException($"Default value not set for '{typeToConvert.Name}'");
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}
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return (T)customValueAttribute.Value;
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}
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return _baseConverter.Read(ref reader, typeToConvert, options);
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}
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/// <inheritdoc />
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public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
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{
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_baseConverter.Write(writer, value, options);
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}
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}
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