71 lines
2.3 KiB
C#
71 lines
2.3 KiB
C#
using Newtonsoft.Json;
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
using System.Threading.Tasks;
|
|
|
|
namespace Jugenddienst_Stunden.Models {
|
|
public class JsonSingleOrEmptyArrayConverter<T> : JsonConverter where T : class {
|
|
public override bool CanConvert(Type objectType) {
|
|
return typeof(T).IsAssignableFrom(objectType);
|
|
}
|
|
|
|
public override bool CanWrite { get { return false; } }
|
|
|
|
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) {
|
|
var contract = serializer.ContractResolver.ResolveContract(objectType);
|
|
if (!(contract is Newtonsoft.Json.Serialization.JsonObjectContract || contract is Newtonsoft.Json.Serialization.JsonDictionaryContract)) {
|
|
throw new JsonSerializationException(string.Format("Unsupported objectType {0} at {1}.", objectType, reader.Path));
|
|
}
|
|
|
|
switch (reader.SkipComments().TokenType) {
|
|
case JsonToken.StartArray: {
|
|
int count = 0;
|
|
while (reader.Read()) {
|
|
switch (reader.TokenType) {
|
|
case JsonToken.Comment:
|
|
break;
|
|
case JsonToken.EndArray:
|
|
return existingValue;
|
|
default: {
|
|
count++;
|
|
if (count > 1)
|
|
throw new JsonSerializationException(string.Format("Too many objects at path {0}.", reader.Path));
|
|
existingValue = existingValue ?? contract.DefaultCreator();
|
|
serializer.Populate(reader, existingValue);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
// Should not come here.
|
|
throw new JsonSerializationException(string.Format("Unclosed array at path {0}.", reader.Path));
|
|
}
|
|
|
|
case JsonToken.Null:
|
|
return null;
|
|
|
|
case JsonToken.StartObject:
|
|
existingValue = existingValue ?? contract.DefaultCreator();
|
|
serializer.Populate(reader, existingValue);
|
|
return existingValue;
|
|
|
|
default:
|
|
throw new InvalidOperationException("Unexpected token type " + reader.TokenType.ToString());
|
|
}
|
|
}
|
|
|
|
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) {
|
|
throw new NotImplementedException();
|
|
}
|
|
}
|
|
|
|
public static partial class JsonExtensions {
|
|
public static JsonReader SkipComments(this JsonReader reader) {
|
|
while (reader.TokenType == JsonToken.Comment && reader.Read())
|
|
;
|
|
return reader;
|
|
}
|
|
}
|
|
}
|