Penumbra/Penumbra/Util/SingleOrArrayConverter.cs

using System;
using System.Collections.Generic;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

public class SingleOrArrayConverter<T> : JsonConverter
{
    public override bool CanConvert( Type objectType )
    {
        return (objectType == typeof(HashSet<T>));
    }

    public override object ReadJson( JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer )
    {
        var token = JToken.Load(reader);
        if (token.Type == JTokenType.Array)
        {
            return token.ToObject<HashSet<T>>();
        }
        return new HashSet<T>{ token.ToObject<T>() };
    }

    public override bool CanWrite => false;

    public override void WriteJson( JsonWriter writer, object value, JsonSerializer serializer )
    {
        throw new NotImplementedException();
    }
}

public class DictSingleOrArrayConverter<T,U> : JsonConverter
{
    public override bool CanConvert( Type objectType )
    {
        return (objectType == typeof(Dictionary<T, HashSet<U>>));
    }

    public override object ReadJson( JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer )
    {
        var token = JToken.Load(reader);
        
        if (token.Type == JTokenType.Array)
        {
            return token.ToObject<HashSet<T>>();
        }
        return new HashSet<T>{ token.ToObject<T>() };
    }

    public override bool CanWrite => false;

    public override void WriteJson( JsonWriter writer, object value, JsonSerializer serializer )
    {
        throw new NotImplementedException();
    }
}