chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
5008 changed files with 910633 additions and 0 deletions
@@ -0,0 +1,106 @@
+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+*/
+
+using System;
+using System.Linq;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+using System.Collections.Generic;
+
+namespace QuantConnect.Util
+{
+    /// <summary>
+    /// Provides a json converter that allows defining the date time format used
+    /// </summary>
+    public class DateTimeJsonConverter : JsonConverter
+    {
+        private readonly List<IsoDateTimeConverter> _converters;
+
+        /// <summary>
+        /// True, can read a json into a date time
+        /// </summary>
+        public override bool CanRead => true;
+
+        /// <summary>
+        /// True, can write a datetime to json
+        /// </summary>
+        public override bool CanWrite => true;
+
+        /// <summary>
+        ///  Initializes a new instance of the <see cref="DateTimeJsonConverter"/> class
+        /// </summary>
+        /// <param name="format">>The date time format</param>
+        public DateTimeJsonConverter(string format)
+        {
+            _converters = [new IsoDateTimeConverter() { DateTimeFormat = format }];
+        }
+
+        /// <summary>
+        ///  Initializes a new instance of the <see cref="DateTimeJsonConverter"/> class
+        /// </summary>
+        /// <param name="format">>The date time format</param>
+        /// <param name="format2">Other format for backwards compatibility</param>
+        public DateTimeJsonConverter(string format, string format2) : this(format)
+        {
+            _converters.Add(new IsoDateTimeConverter() { DateTimeFormat = format2 });
+        }
+
+        /// <summary>
+        ///  Initializes a new instance of the <see cref="DateTimeJsonConverter"/> class
+        /// </summary>
+        /// <param name="format">>The date time format</param>
+        /// <param name="format2">Other format for backwards compatibility</param>
+        /// <param name="format3">Other format for backwards compatibility</param>
+        public DateTimeJsonConverter(string format, string format2, string format3) : this(format, format2)
+        {
+            _converters.Add(new IsoDateTimeConverter() { DateTimeFormat = format3 });
+        }
+
+        /// <summary>
+        /// True if can convert the given object type
+        /// </summary>
+        public override bool CanConvert(Type objectType)
+        {
+            return objectType == typeof(DateTime) || objectType == typeof(string) || objectType == typeof(DateTime?);
+        }
+
+        /// <summary>
+        /// Converts the given value
+        /// </summary>
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            foreach (var converter in _converters)
+            {
+                try
+                {
+                    return converter.ReadJson(reader, objectType, existingValue, serializer);
+                }
+                catch
+                {
+                }
+            }
+            throw new JsonSerializationException($"Unexpected value when converting date. Expected formats: {string.Join(",", _converters.Select(x => x.DateTimeFormat))}");
+        }
+
+        /// <summary>
+        /// Writes the given value to json
+        /// </summary>
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            _converters[0].WriteJson(writer, value, serializer);
+        }
+    }
+}