LayerViewCreationConverter.cs

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using System;
using AnalyzeRe.APITypes;
using AnalyzeRe.Utilities;
using Newtonsoft.Json.Linq;
 
namespace AnalyzeRe.JsonConverters
{
    public class LayerViewCreationConverter : JsonCreationConverter<ILayerView>
    {
        #region Constants
        private const string LayerPropertyName = nameof(ILayerView.layer);
        private const string LayerTypePropertyName = APIType_Polymorphic.TypePropertyName;
        #endregion Constants
 
        protected override ILayerView Create(Type objectType, JObject jObject)
        {
            // If the requested objectType is not an interface (i.e. ILayerview<...>)
            // and is instead an instantiable object type (LayerView<ILayer>), then
            // it is incorrect for us to create an object that is type specific, such
            // as LayerView<CatXL> as that is covariantly incompatible.
            // So just instantiate the specified type.
            if (!objectType.IsInterface && !objectType.IsAbstract)
                return (ILayerView)Activator.CreateInstance(objectType);
 
            JToken layer = jObject[LayerPropertyName];
            if (layer == null)
                throw new InvalidOperationException(
                    "Could not parse this LayerView object because " +
                    "it is missing the '" + LayerPropertyName + "' property");
            string layerTypeName = (layer[LayerTypePropertyName] ?? "").ToString();
            if (String.IsNullOrEmpty(layerTypeName))
                throw new InvalidOperationException(
                    "Could not parse this LayerView because it's layer " +
                    "does not specify the '" + layerTypeName + "' property");
 
            if (TypeResolver.ResolveTypeByName(layerTypeName, out Type resolvedLayerType, typeof(ILayer)))
                return (ILayerView)Activator.CreateInstance(
                    typeof(LayerView<>).MakeGenericTypeFast(resolvedLayerType));
            throw new InvalidOperationException("The server returned an " +
                "unrecognized layer sub-type: \"" + layerTypeName + "\".");
        }
    }
}