wehub-resource-sync
85 lines
2.8 KiB
C#
85 lines
2.8 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.IO;
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namespace QuantConnect.ToolBox
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{
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/// <summary>
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/// This class wraps a <see cref="StreamWriter"/> so that the StreamWriter is only
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/// instantiated until WriteLine() is called. This ensures that the file the StreamWriter is
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/// writing to is only created if something is written to it. A StreamWriter will create a empty file
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/// as soon as it is instantiated.
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/// </summary>
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public class LazyStreamWriter
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{
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private StreamWriter _streamWriter;
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private readonly string _path;
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/// <summary>
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/// Constructor for the <see cref="LazyStreamWriter"/>
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/// </summary>
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/// <param name="path">Path to the file that should be created</param>
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public LazyStreamWriter(string path)
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{
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_path = path;
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}
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/// <summary>
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/// Wraps the WriteLine method of the StreamWriter.
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/// </summary>
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/// <param name="line">The line to write</param>
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/// <remarks>Will instantiate the StreamWriter if this is the first time this method is called</remarks>
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public void WriteLine(string line)
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{
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PrepareStreamWriter();
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_streamWriter.WriteLine(line);
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}
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/// <summary>
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/// Wraps the <see cref="StreamWriter.Flush()"/> method
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/// </summary>
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public void Flush()
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{
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if (_streamWriter != null)
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{
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_streamWriter.Flush();
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}
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}
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/// <summary>
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/// Wraps the <see cref="StreamWriter.Close()"/> method
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/// </summary>
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public void Close()
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{
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if (_streamWriter != null)
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{
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_streamWriter.Close();
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}
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}
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/// <summary>
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/// Checks if the StreamWriter is instantiated. If not, it will instantiate the StreamWriter
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/// </summary>
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private void PrepareStreamWriter()
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{
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if (_streamWriter == null)
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{
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_streamWriter = new StreamWriter(_path);
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}
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}
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}
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}
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