log4net/Layout/PatternLayout.cs

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#region Copyright & License
//
// Copyright 2001-2006 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

using System;
using System.Collections;
using System.IO;

using log4net.Core;
using log4net.Layout.Pattern;
using log4net.Util;

namespace log4net.Layout
{
	/// <summary>
	/// A flexible layout configurable with pattern string.
	/// </summary>
	/// <remarks>
	/// <para>
	/// The goal of this class is to <see cref="PatternLayout.Format"/> a 
	/// <see cref="LoggingEvent"/> as a string. The results
	/// depend on the <i>conversion pattern</i>.
	/// </para>
	/// <para>
	/// The conversion pattern is closely related to the conversion
	/// pattern of the printf function in C. A conversion pattern is
	/// composed of literal text and format control expressions called
	/// <i>conversion specifiers</i>.
	/// </para>
	/// <para>
	/// <i>You are free to insert any literal text within the conversion
	/// pattern.</i>
	/// </para>
	/// <para>
	/// Each conversion specifier starts with a percent sign (%) and is
	/// followed by optional <i>format modifiers</i> and a <i>conversion
	/// pattern name</i>. The conversion pattern name specifies the type of
	/// data, e.g. logger, level, date, thread name. The format
	/// modifiers control such things as field width, padding, left and
	/// right justification. The following is a simple example.
	/// </para>
	/// <para>
	/// Let the conversion pattern be <b>"%-5level [%thread]: %message%newline"</b> and assume
	/// that the log4net environment was set to use a PatternLayout. Then the
	/// statements
	/// </para>