88 lines
3 KiB
C#
88 lines
3 KiB
C#
/*************************************************************************
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* ModernUO *
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* Copyright 2019-2026 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: BitArrayEnumIndexConverter.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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using System.Collections;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace Server.Json;
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public class BitArrayEnumIndexConverter<T> : JsonConverter<BitArray> where T : struct, Enum
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{
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// ReSharper disable once StaticMemberInGenericType
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private static int _maxValue = int.MinValue;
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public override BitArray Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
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{
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if (_maxValue < 0)
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{
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// Get the max value and cache it.
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var values = Enum.GetValues<T>();
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for (var i = 0; i < values.Length; i++)
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{
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var v = (int)(object)values[i];
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if (v > _maxValue)
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{
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_maxValue = v;
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}
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}
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}
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// If the value is very large, we will have a major problem.
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// We always assume zero-offset
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var bitArray = new BitArray(_maxValue + 1);
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while (true)
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{
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reader.Read();
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if (reader.TokenType == JsonTokenType.EndObject)
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{
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break;
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}
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if (reader.TokenType != JsonTokenType.PropertyName)
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{
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throw new JsonException("Invalid Json structure for Flag object");
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}
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var key = reader.GetString();
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reader.Read();
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if (!reader.GetBoolean() || !Enum.TryParse<T>(key, out var val))
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{
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continue;
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}
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bitArray[(int)(object)val] = true;
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}
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return bitArray;
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}
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public override void Write(Utf8JsonWriter writer, BitArray bitArray, JsonSerializerOptions options)
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{
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writer.WriteStartObject();
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foreach (var flagName in Enum.GetNames(typeof(T)))
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{
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var value = (int)(object)Enum.Parse<T>(flagName, false);
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writer.WriteBoolean(flagName, bitArray[value]);
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}
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writer.WriteEndObject();
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}
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}
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