BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Log/Log4net/Core/SecurityContextProvider.cs

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#region Apache License
//
// Licensed to the Apache Software Foundation (ASF) under one or more 
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership. 
// The ASF licenses this file to you 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 log4net.Util;

namespace log4net.Core
{
	/// <summary>
	/// The <see cref="SecurityContextProvider"/> providers default <see cref="SecurityContext"/> instances.
	/// </summary>
	/// <remarks>
	/// <para>
	/// A configured component that interacts with potentially protected system
	/// resources uses a <see cref="SecurityContext"/> to provide the elevated
	/// privileges required. If the <see cref="SecurityContext"/> object has
	/// been not been explicitly provided to the component then the component
	/// will request one from this <see cref="SecurityContextProvider"/>.
	/// </para>
	/// <para>
	/// By default the <see cref="SecurityContextProvider.DefaultProvider"/> is
	/// an instance of <see cref="SecurityContextProvider"/> which returns only
	/// <see cref="NullSecurityContext"/> objects. This is a reasonable default
	/// where the privileges required are not know by the system.
	/// </para>
	/// <para>
	/// This default behavior can be overridden by subclassing the <see cref="SecurityContextProvider"/>
	/// and overriding the <see cref="CreateSecurityContext"/> method to return
	/// the desired <see cref="SecurityContext"/> objects. The default provider
	/// can be replaced by programmatically setting the value of the 
	/// <see cref="SecurityContextProvider.DefaultProvider"/> property.
	/// </para>
	/// <para>
	/// An alternative is to use the <c>log4net.Config.SecurityContextProviderAttribute</c>
	/// This attribute can be applied to an assembly in the same way as the
	/// <c>log4net.Config.XmlConfiguratorAttribute"</c>. The attribute takes
	/// the type to use as the <see cref="SecurityContextProvider"/> as an argument.
	/// </para>
	/// </remarks>
	/// <author>Nicko Cadell</author>
	public class SecurityContextProvider
	{
		/// <summary>