#region Apache License
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// The ASF licenses this file to you under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// 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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#endregion
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using System;
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using System.IO;
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using log4net.Core;
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namespace log4net.Util
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{
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/// <summary>
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/// Subclass of <see cref="QuietTextWriter"/> that maintains a count of
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/// the number of bytes written.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This writer counts the number of bytes written.
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/// </para>
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/// </remarks>
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/// <author>Nicko Cadell</author>
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/// <author>Gert Driesen</author>
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public class CountingQuietTextWriter : QuietTextWriter
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{
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#region Public Instance Constructors
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/// <summary>
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/// Constructor
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/// </summary>
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/// <param name="writer">The <see cref="TextWriter" /> to actually write to.</param>
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/// <param name="errorHandler">The <see cref="IErrorHandler" /> to report errors to.</param>
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/// <remarks>
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/// <para>
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/// Creates a new instance of the <see cref="CountingQuietTextWriter" /> class
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/// with the specified <see cref="TextWriter" /> and <see cref="IErrorHandler" />.
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/// </para>
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/// </remarks>
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public CountingQuietTextWriter(TextWriter writer, IErrorHandler errorHandler) : base(writer, errorHandler)
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{
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m_countBytes = 0;
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}
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#endregion Public Instance Constructors
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#region Override implementation of QuietTextWriter
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/// <summary>
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/// Writes a character to the underlying writer and counts the number of bytes written.
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/// </summary>
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/// <param name="value">the char to write</param>
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/// <remarks>
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/// <para>
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/// Overrides implementation of <see cref="QuietTextWriter"/>. Counts
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/// the number of bytes written.
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/// </para>
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/// </remarks>
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public override void Write(char value)
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{
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try
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{
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base.Write(value);
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// get the number of bytes needed to represent the
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// char using the supplied encoding.
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m_countBytes += this.Encoding.GetByteCount(new char[] { value });
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}
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catch(Exception e)
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{
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this.ErrorHandler.Error("Failed to write [" + value + "].", e, ErrorCode.WriteFailure);
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}
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}
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/// <summary>
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/// Writes a buffer to the underlying writer and counts the number of bytes written.
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/// </summary>
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/// <param name="buffer">the buffer to write</param>
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/// <param name="index">the start index to write from</param>
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/// <param name="count">the number of characters to write</param>
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/// <remarks>
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/// <para>
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/// Overrides implementation of <see cref="QuietTextWriter"/>. Counts
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/// the number of bytes written.
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/// </para>
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/// </remarks>
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public override void Write(char[] buffer, int index, int count)
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{
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if (count > 0)
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{
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try
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{
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base.Write(buffer, index, count);
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// get the number of bytes needed to represent the
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// char array using the supplied encoding.
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m_countBytes += this.Encoding.GetByteCount(buffer, index, count);
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}
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catch(Exception e)
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{
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this.ErrorHandler.Error("Failed to write buffer.", e, ErrorCode.WriteFailure);
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}
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}
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}
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/// <summary>
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/// Writes a string to the output and counts the number of bytes written.
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/// </summary>
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/// <param name="str">The string data to write to the output.</param>
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/// <remarks>
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/// <para>
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/// Overrides implementation of <see cref="QuietTextWriter"/>. Counts
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/// the number of bytes written.
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/// </para>
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/// </remarks>
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override public void Write(string str)
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{
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if (str != null && str.Length > 0)
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{
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try
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{
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base.Write(str);
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// get the number of bytes needed to represent the
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// string using the supplied encoding.
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m_countBytes += this.Encoding.GetByteCount(str);
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}
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catch(Exception e)
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{
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this.ErrorHandler.Error("Failed to write [" + str + "].", e, ErrorCode.WriteFailure);
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}
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}
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}
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#endregion Override implementation of QuietTextWriter
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#region Public Instance Properties
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/// <summary>
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/// Gets or sets the total number of bytes written.
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/// </summary>
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/// <value>
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/// The total number of bytes written.
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/// </value>
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/// <remarks>
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/// <para>
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/// Gets or sets the total number of bytes written.
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/// </para>
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/// </remarks>
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public long Count
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{
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get { return m_countBytes; }
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set { m_countBytes = value; }
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}
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#endregion Public Instance Properties
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#region Private Instance Fields
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/// <summary>
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/// Total number of bytes written.
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/// </summary>
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private long m_countBytes;
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#endregion Private Instance Fields
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}
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}
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