PortfolioViewSerializer.cs

Go to the documentation of this file.

using System;
using System.Linq;
using Newtonsoft.Json;
 
namespace AnalyzeRe.JsonConverters
{
    public class PortfolioViewSerializer : JsonConverter
    {
        public override bool CanConvert(Type objectType)
        {
            return typeof(PortfolioView).IsAssignableFrom(objectType);
        }
 
        public override object ReadJson(
            JsonReader reader,
            Type objectType,
            object existingValue,
            JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Null)
                return null;
            PortfolioView target = new PortfolioView();
            serializer.Populate(reader, target);
            return target;
        }
 
        public override void WriteJson(
            JsonWriter writer,
            object value,
            JsonSerializer serializer)
        {
            if (value == null)
            {
                writer.WriteNull();
                return;
            }
            if (!(value is PortfolioView pv))
                throw new InvalidOperationException($"Unhandled case for PortfolioViewSerializer. " +
                    $"Unexpected non-PortfolioView value: {value}");
 
            // We want to serialize using the current serializer settings,
            // but use the default serializing behaviour (to avoid infinite recursion).
            // TODO: Have to revisit this if ever a portfolio_view can reference another portfolio_view.
            //       In that case we'll have to serialize the current level manually, and invoke
            //       the current unmodified serializer on each member.
            JsonSerializerSettings recurseSettings = serializer.GetJsonSerializerSettings();
            recurseSettings.Converters.Remove(
                serializer.Converters.OfType<PortfolioViewSerializer>().Cast<JsonConverter>().Single());
            JsonSerializer recurseSerializer = JsonSerializer.Create(recurseSettings);
 
            if (pv.layer_views == null || pv.portfolio == null)
                recurseSerializer.Serialize(writer, pv);
            else
            {
                // If the user has specified a portfolio reference, and the layer_views collection
                // is empty but isn't null, we should set it to null or the server will complain
                // that both were specified, while layer_views being empty should be treated as null.
                PortfolioView pvFixed = pv.ShallowCopy();
                if (!pv.layer_views.Any())
                    pvFixed.layer_views = null;
                // If the user actually supplied both, they will get an error as expected
                recurseSerializer.Serialize(writer, pvFixed);
            }
        }
    }
}