wehub-resource-sync
114 lines
4.9 KiB
C#
114 lines
4.9 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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*/
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using System;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Linq;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// Provides a base class for a <see cref="JsonConverter"/> that serializes a
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/// an input type as some other output type
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/// </summary>
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/// <typeparam name="T">The type to be serialized</typeparam>
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/// <typeparam name="TResult">The output serialized type</typeparam>
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public abstract class TypeChangeJsonConverter<T, TResult> : JsonConverter
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{
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// we use a json serializer which allows using non public default constructor
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private readonly JsonSerializer _jsonSerializer = new JsonSerializer {ConstructorHandling = ConstructorHandling.AllowNonPublicDefaultConstructor};
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/// <summary>
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/// True will populate TResult object returned by <see cref="Convert(TResult)"/> with json properties
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/// </summary>
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protected virtual bool PopulateProperties => true;
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/// <summary>
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/// Reads the JSON representation of the object.
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/// </summary>
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/// <param name="reader">The <see cref="T:Newtonsoft.Json.JsonReader"/> to read from.</param><param name="objectType">Type of the object.</param><param name="existingValue">The existing value of object being read.</param><param name="serializer">The calling serializer.</param>
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/// <returns>
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/// The object value.
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/// </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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// Load token from stream
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var token = JToken.Load(reader);
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// Create target object based on token
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var target = Create(objectType, token);
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return target;
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}
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/// <summary>
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/// Writes the JSON representation of the object.
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/// </summary>
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/// <param name="writer">The <see cref="T:Newtonsoft.Json.JsonWriter"/> to write to.</param><param name="value">The value.</param><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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// Convert the value into TResult to be serialized
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var valueToSerialize = Convert((T)value);
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serializer.Serialize(writer, valueToSerialize);
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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>
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/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
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/// </returns>
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public override bool CanConvert(Type objectType)
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{
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return typeof(T) == objectType;
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}
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/// <summary>
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/// Creates an instance of the un-projected type to be deserialized
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/// </summary>
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/// <param name="type">The input object type, this is the data held in the token</param>
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/// <param name="token">The input data to be converted into a T</param>
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/// <returns>A new instance of T that is to be serialized using default rules</returns>
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protected virtual T Create(Type type, JToken token)
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{
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// reads the token as an object type
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if (typeof(TResult).IsClass && typeof(T) != typeof(string))
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{
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return Convert(token.ToObject<TResult>(_jsonSerializer));
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}
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// reads the token as a value type
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return Convert(token.Value<TResult>());
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}
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/// <summary>
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/// Convert the input value to a value to be serialized
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/// </summary>
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/// <param name="value">The input value to be converted before serialziation</param>
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/// <returns>A new instance of TResult that is to be serialzied</returns>
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protected abstract TResult Convert(T value);
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/// <summary>
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/// Converts the input value to be deserialized
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/// </summary>
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/// <param name="value">The deserialized value that needs to be converted to T</param>
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/// <returns>The converted value</returns>
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protected abstract T Convert(TResult value);
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}
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}
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