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