#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 System.Text;
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using log4net.Util;
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using log4net.Core;
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namespace log4net.Layout
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{
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/// <summary>
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/// A Layout that renders only the Exception text from the logging event
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/// </summary>
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/// <remarks>
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/// <para>
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/// A Layout that renders only the Exception text from the logging event.
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/// </para>
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/// <para>
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/// This Layout should only be used with appenders that utilize multiple
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/// layouts (e.g. <see cref="log4net.Appender.AdoNetAppender"/>).
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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 ExceptionLayout : LayoutSkeleton
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{
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#region Constructors
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/// <summary>
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/// Default constructor
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/// </summary>
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/// <remarks>
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/// <para>
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/// Constructs a ExceptionLayout
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/// </para>
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/// </remarks>
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public ExceptionLayout()
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{
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this.IgnoresException = false;
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}
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#endregion
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#region Implementation of IOptionHandler
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/// <summary>
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/// Activate component options
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/// </summary>
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/// <remarks>
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/// <para>
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/// Part of the <see cref="IOptionHandler"/> component activation
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/// framework.
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/// </para>
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/// <para>
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/// This method does nothing as options become effective immediately.
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/// </para>
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/// </remarks>
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override public void ActivateOptions()
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{
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// nothing to do.
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}
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#endregion
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#region Override implementation of LayoutSkeleton
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/// <summary>
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/// Gets the exception text from the logging event
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/// </summary>
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/// <param name="writer">The TextWriter to write the formatted event to</param>
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/// <param name="loggingEvent">the event being logged</param>
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/// <remarks>
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/// <para>
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/// Write the exception string to the <see cref="TextWriter"/>.
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/// The exception string is retrieved from <see cref="LoggingEvent.GetExceptionString()"/>.
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/// </para>
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/// </remarks>
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override public void Format(TextWriter writer, LoggingEvent loggingEvent)
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{
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if (loggingEvent == null)
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{
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throw new ArgumentNullException("loggingEvent");
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}
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writer.Write(loggingEvent.GetExceptionString());
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}
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#endregion
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}
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}
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