Co-authored-by: iceypotato <nickyjedi@gmail.com>pull/5870/head
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Runtime.Serialization;
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using Newtonsoft.Json;
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namespace NzbDrone.Core.ImportLists
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{
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/* This class was copied from gubenkoved TolerantEnumConverter.cs file, which is available from github
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* https://gist.github.com/gubenkoved/999eb73e227b7063a67a50401578c3a7
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*/
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public class TolerantEnumConverter : JsonConverter
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{
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[ThreadStatic]
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private static Dictionary<Type, Dictionary<string, object>> _fromValueMap; // string representation to Enum value map
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[ThreadStatic]
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private static Dictionary<Type, Dictionary<object, string>> _toValueMap; // Enum value to string map
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public string UnknownValue { get; set; } = "Unknown";
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public override bool CanConvert(Type objectType)
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{
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var type = IsNullableType(objectType) ? Nullable.GetUnderlyingType(objectType) : objectType;
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return type.IsEnum;
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}
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public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
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{
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var isNullable = IsNullableType(objectType);
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var enumType = isNullable ? Nullable.GetUnderlyingType(objectType) : objectType;
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InitMap(enumType);
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if (reader.TokenType == JsonToken.String)
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{
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var enumText = reader.Value.ToString();
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var val = FromValue(enumType, enumText);
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if (val != null)
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{
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return val;
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}
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}
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else if (reader.TokenType == JsonToken.Integer)
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{
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var enumVal = Convert.ToInt32(reader.Value);
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var values = (int[])Enum.GetValues(enumType);
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if (values.Contains(enumVal))
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{
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return Enum.Parse(enumType, enumVal.ToString());
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}
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}
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if (!isNullable)
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{
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var names = Enum.GetNames(enumType);
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var unknownName = names
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.Where(n => string.Equals(n, UnknownValue, StringComparison.OrdinalIgnoreCase))
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.FirstOrDefault();
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if (unknownName == null)
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{
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throw new JsonSerializationException($"Unable to parse '{reader.Value}' to enum {enumType}. Consider adding Unknown as fail-back value.");
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}
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return Enum.Parse(enumType, unknownName);
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}
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return null;
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}
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public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
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{
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var enumType = value.GetType();
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InitMap(enumType);
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var val = ToValue(enumType, value);
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writer.WriteValue(val);
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}
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private bool IsNullableType(Type t)
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{
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return t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>);
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}
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private void InitMap(Type enumType)
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{
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if (_fromValueMap == null)
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{
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_fromValueMap = new Dictionary<Type, Dictionary<string, object>>();
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}
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if (_toValueMap == null)
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{
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_toValueMap = new Dictionary<Type, Dictionary<object, string>>();
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}
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if (_fromValueMap.ContainsKey(enumType))
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{
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return; // already initialized
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}
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var fromMap = new Dictionary<string, object>(StringComparer.InvariantCultureIgnoreCase);
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var toMap = new Dictionary<object, string>();
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var fields = enumType.GetFields(BindingFlags.Static | BindingFlags.Public);
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foreach (var field in fields)
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{
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var name = field.Name;
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var enumValue = Enum.Parse(enumType, name);
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// use EnumMember attribute if exists
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var enumMemberAttrbiute = field.GetCustomAttribute<EnumMemberAttribute>();
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if (enumMemberAttrbiute != null)
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{
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var enumMemberValue = enumMemberAttrbiute.Value;
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fromMap[enumMemberValue] = enumValue;
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toMap[enumValue] = enumMemberValue;
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}
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else
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{
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toMap[enumValue] = name;
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}
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fromMap[name] = enumValue;
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}
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_fromValueMap[enumType] = fromMap;
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_toValueMap[enumType] = toMap;
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}
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private string ToValue(Type enumType, object obj)
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{
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var map = _toValueMap[enumType];
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return map[obj];
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}
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private object FromValue(Type enumType, string value)
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{
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var map = _fromValueMap[enumType];
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if (!map.ContainsKey(value))
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{
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return null;
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}
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return map[value];
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}
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}
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}
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