wehub-resource-sync
76 lines
3.3 KiB
C#
76 lines
3.3 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using Newtonsoft.Json;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// Reads json and always produces a List, even if the input has just an object
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/// </summary>
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public class SingleValueListConverter<T> : JsonConverter
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{
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/// <summary>
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/// Writes the JSON representation of the object. If the instance is not a list then it will
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/// be wrapped in a list
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/// </summary>
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/// <param name="writer">The <see cref="T:Newtonsoft.Json.JsonWriter"/> to write to.</param>
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/// <param name="value">The value.</param>
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/// <param name="serializer">The calling serializer.</param>
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public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
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{
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if (value is T)
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{
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value = new List<T> {(T)value};
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}
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serializer.Serialize(writer, value);
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}
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/// <summary>
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/// Reads the JSON representation of the object. If the JSON represents a singular instance, it will be returned
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/// in a list.
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/// </summary>
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/// <param name="reader">The <see cref="T:Newtonsoft.Json.JsonReader"/> to read from.</param>
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/// <param name="objectType">Type of the object.</param>
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/// <param name="existingValue">The existing value of object being read.</param>
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/// <param name="serializer">The calling serializer.</param>
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/// <returns>The object value</returns>
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public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
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{
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switch (reader.TokenType)
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{
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case JsonToken.String:
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case JsonToken.StartObject:
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return new List<T> {serializer.Deserialize<T>(reader)};
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case JsonToken.StartArray:
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return serializer.Deserialize<List<T>>(reader);
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default:
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throw new ArgumentException("The JsonReader is expected to point at a JsonToken.StartObject or JsonToken.StartArray.");
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}
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}
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/// <summary>
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/// Determines whether this instance can convert the specified object type.
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/// </summary>
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/// <param name="objectType">Type of the object.</param>
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/// <returns><c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.</returns>
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public override bool CanConvert(Type objectType)
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{
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return objectType == typeof(T) || objectType == typeof(List<T>);
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}
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}
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} |