ReFuel.Gltf/ReFuel.Gltf/GltfSerializedExtensionProvider.cs

using System;
using System.Reflection;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace ReFuel.Gltf
{
    public class GltfSerializedExtensionProvider<T> : IGltfExtensionProvider<T>
    {
        public string Name { get; }

        public Type? DataType { get; } = typeof(T);

        public GltfSerializedExtensionProvider(string name)
        {
            Name = name;
            if (typeof(T).GetCustomAttribute<JsonSerializableAttribute>() is null)
                throw new Exception("This type is not JSON serializable.");
        }

        public T ParseExtension(JsonElement element)
        {
            return JsonSerializer.Deserialize<T>(element) ?? throw new Exception("Could not deserialize extension object.");
        }

        public object ParseExtensionObject(JsonElement element)
        {
            return ParseExtension(element)!;
        }

        public void WriteExtension(T value, Utf8JsonWriter writer)
        {
            JsonSerializer.Serialize(writer, value);
        }

        public void WriteExtensionObject(object obj, Utf8JsonWriter writer)
        {
            if (obj is T extensionType)
            {
                WriteExtension(extensionType, writer);
            }
            else throw new Exception($"Unexpected type of object {obj.GetType()}.");
        }
    }
}