Martin Molinero
59 lines
2.0 KiB
C#
59 lines
2.0 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;
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using System.IO;
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using QuantConnect.Interfaces;
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namespace QuantConnect.Lean.Engine.DataFeeds
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{
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/// <summary>
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/// Default file provider functionality that does not attempt to retrieve any data
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/// </summary>
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public class DefaultDataProvider : IDataProvider, IDisposable
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{
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/// <summary>
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/// Retrieves data from disc to be used in an algorithm
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/// </summary>
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/// <param name="key">A string representing where the data is stored</param>
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/// <returns>A <see cref="Stream"/> of the data requested</returns>
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public Stream Fetch(string key)
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{
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try
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{
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return new FileStream(key, FileMode.Open, FileAccess.Read, FileShare.Read);
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}
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catch (Exception exception)
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{
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if (exception is DirectoryNotFoundException
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|| exception is FileNotFoundException)
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{
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return null;
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}
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throw;
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}
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}
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/// <summary>
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/// The stream created by this type is passed up the stack to the IStreamReader
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/// The stream is closed when the StreamReader that wraps this stream is disposed</summary>
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public void Dispose()
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{
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//
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}
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}
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}
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