44 lines
1.5 KiB
C#
44 lines
1.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace Questionable.Model.Common.Converter;
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public abstract class EnumConverter<T> : JsonConverter<T> where T : Enum
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{
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private readonly ReadOnlyDictionary<T, string> _enumToString;
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private readonly ReadOnlyDictionary<string, T> _stringToEnum;
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protected EnumConverter(IReadOnlyDictionary<T, string> values)
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{
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_enumToString = ((values is IDictionary<T, string> dictionary) ? new ReadOnlyDictionary<T, string>(dictionary) : new ReadOnlyDictionary<T, string>(values.ToDictionary<KeyValuePair<T, string>, T, string>((KeyValuePair<T, string> x) => x.Key, (KeyValuePair<T, string> x) => x.Value)));
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_stringToEnum = new ReadOnlyDictionary<string, T>(_enumToString.ToDictionary<KeyValuePair<T, string>, string, T>((KeyValuePair<T, string> x) => x.Value, (KeyValuePair<T, string> x) => x.Key));
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}
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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.TokenType != JsonTokenType.String)
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{
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throw new JsonException();
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}
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string text = reader.GetString();
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if (text == null)
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{
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throw new JsonException();
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}
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if (!_stringToEnum.TryGetValue(text, out var value))
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{
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throw new JsonException();
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}
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return value;
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}
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public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
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{
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writer.WriteStringValue(_enumToString[value]);
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}
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}
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