Added converter for anchor objects. (#43)

Author: Kevin Hellemun

BunqSdk/Json/AnchorObjectConverter.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using Bunq.Sdk.Model.Core;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace Bunq.Sdk.Json
+{
+    public class AnchorObjectConverter: JsonConverter
+    {
+        private const string FORMAT_DATE = "yyyy-MM-dd HH:mm:ss.ffffff";
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            
+            new JsonSerializer().Serialize(writer, value);
+            
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            var list = new List<Type> {typeof(IAnchorObjectInterface)};
+            var jsonSerializer = JsonSerializer.CreateDefault(
+                new JsonSerializerSettings
+            {
+                ContractResolver = new BunqContractResolver(list),
+                DateFormatString = FORMAT_DATE,
+                FloatParseHandling = FloatParseHandling.Decimal,
+                Formatting = Formatting.Indented,
+                NullValueHandling = NullValueHandling.Ignore,
+            });
+            
+            JToken token = JObject.Load(reader);
+            var model = (IAnchorObjectInterface) jsonSerializer.Deserialize(token.CreateReader(), objectType);
+
+            if (!model.AreAllFieldNull()) return model;
+            var fields = objectType.GetProperties();
+
+            foreach (var field in fields)
+            {
+                var fieldType = field.PropertyType;
+                    
+                if (!typeof(BunqModel).IsAssignableFrom(fieldType))
+                {
+                    continue;
+                }
+                
+                var fieldContent = (BunqModel) jsonSerializer.Deserialize(token.CreateReader(), fieldType);
+
+                field.SetValue(model, fieldContent.AreAllFieldNull() ? null : fieldContent);
+            }
+
+            return model;
+        }
+
+        public override bool CanConvert(Type objectType)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}