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
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+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2026 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 QuantConnect.Util;
+using QuantConnect.Interfaces;
+using QuantConnect.Configuration;
+
+namespace QuantConnect.Lean.Engine.DataFeeds.DataDownloader
+{
+    /// <summary>Selects the appropriate data downloader based on the data type.</summary>
+    public class DataDownloaderSelector : IDisposable
+    {
+        private readonly IDataDownloader _baseDataDownloader;
+        private readonly CanonicalDataDownloaderDecorator _canonicalDataDownloaderDecorator;
+
+        /// <summary>Initializes a new instance of the <see cref="DataDownloaderSelector"/> class.</summary>
+        /// <param name="baseDataDownloader">The base data downloader instance.</param>
+        /// <param name="mapFileProvider">The map file provider used for initializing chain providers.</param>
+        /// <param name="dataProvider">The data provider used for initializing chain providers.</param>
+        /// <param name="factorFileProvider">The factor file provider used for initializing chain providers.</param>
+        public DataDownloaderSelector(
+            IDataDownloader baseDataDownloader,
+            IMapFileProvider mapFileProvider,
+            IDataProvider dataProvider,
+            IFactorFileProvider factorFileProvider = null)
+        {
+            factorFileProvider ??= Composer.Instance.GetPart<IFactorFileProvider>();
+            if (factorFileProvider == null)
+            {
+                factorFileProvider = Composer.Instance.GetExportedValueByTypeName<IFactorFileProvider>(Config.Get("factor-file-provider", "LocalDiskFactorFileProvider"));
+                factorFileProvider.Initialize(mapFileProvider, dataProvider);
+            }
+
+            _baseDataDownloader = baseDataDownloader;
+            _canonicalDataDownloaderDecorator = new CanonicalDataDownloaderDecorator(_baseDataDownloader, dataProvider, mapFileProvider, factorFileProvider);
+        }
+
+        /// <summary>Disposes the base downloader and the decorator if it was initialized.</summary>
+        public void Dispose()
+        {
+            (_baseDataDownloader as IDisposable)?.DisposeSafely();
+        }
+
+        /// <summary>Returns the appropriate downloader for the given data type.</summary>
+        /// <param name="dataType">The type of data to download.</param>
+        /// <returns>The base downloader for common lean data types, otherwise the canonical decorator.</returns>
+        public IDataDownloader GetDataDownloader(Type dataType)
+        {
+            return LeanData.IsCommonLeanDataType(dataType) ? _canonicalDataDownloaderDecorator : _baseDataDownloader;
+        }
+    }
+}