log4net/Core/Level.cs

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#region Copyright & License
//
// Copyright 2001-2005 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;

namespace log4net.Core
{
	/// <summary>
	/// Defines the default set of levels recognized by the system.
	/// </summary>
	/// <remarks>
	/// <para>
	/// Each <see cref="LoggingEvent"/> has an associated <see cref="Level"/>.
	/// </para>
	/// <para>
	/// Levels have a numeric <see cref="Level.Value"/> that defines the relative 
	/// ordering between levels. Two Levels with the same <see cref="Level.Value"/> 
	/// are deemed to be equivalent.
	/// </para>
	/// <para>
	/// The levels that are recognized by log4net are set for each <see cref="log4net.Repository.ILoggerRepository"/>
	/// and each repository can have different levels defined. The levels are stored
	/// in the <see cref="log4net.Repository.ILoggerRepository.LevelMap"/> on the repository. Levels are
	/// looked up by name from the <see cref="log4net.Repository.ILoggerRepository.LevelMap"/>.
	/// </para>
	/// <para>
	/// When logging at level INFO the actual level used is not <see cref="Level.Info"/> but
	/// the value of <c>LoggerRepository.LevelMap["INFO"]</c>. The default value for this is
	/// <see cref="Level.Info"/>, but this can be changed by reconfiguring the level map.
	/// </para>
	/// <para>
	/// Each level has a <see cref="DisplayName"/> in addition to its <see cref="Name"/>. The 
	/// <see cref="DisplayName"/> is the string that is written into the output log. By default
	/// the display name is the same as the level name, but this can be used to alias levels
	/// or to localize the log output.
	/// </para>
	/// <para>
	/// Some of the predefined levels recognized by the system are:
	/// </para>
	/// <list type="bullet">
	///		<item>
	///			<description><see cref="Off"/>.</description>
	///		</item>
	///		<item>