wehub-resource-sync
81 lines
2.7 KiB
C#
81 lines
2.7 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.Collections.Generic;
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using System.IO;
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using System.Linq;
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using Ionic.Zip;
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namespace QuantConnect.ToolBox
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{
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/// <summary>
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/// Provides an implementation of <see cref="IStreamProvider"/> that opens zip files
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/// </summary>
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public class ZipStreamProvider : IStreamProvider
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{
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private readonly object _sync = new object();
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private readonly Dictionary<string, ZipFile> _zipFiles = new Dictionary<string, ZipFile>();
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/// <summary>
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/// Opens the specified source as read to be consumed stream
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/// </summary>
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/// <param name="source">The source file to be opened</param>
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/// <returns>The stream representing the specified source</returns>
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public IEnumerable<Stream> Open(string source)
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{
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lock (_sync)
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{
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var archive = new ZipFile(source);
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_zipFiles.Add(source, archive);
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foreach (var entry in archive)
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{
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yield return entry.OpenReader();
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}
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}
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}
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/// <summary>
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/// Closes the specified source file stream
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/// </summary>
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/// <param name="source">The source file to be closed</param>
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public void Close(string source)
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{
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lock (_sync)
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{
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ZipFile archive;
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if (_zipFiles.TryGetValue(source, out archive))
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{
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_zipFiles.Remove(source);
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archive.Dispose();
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}
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}
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
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public void Dispose()
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{
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lock (_sync)
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{
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foreach (var zipFile in _zipFiles.Values)
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{
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zipFile.Dispose();
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}
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_zipFiles.Clear();
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}
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}
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}
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} |