#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 log4net.Core;
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namespace log4net.Util
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{
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/// <summary>
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/// A SecurityContext used when a SecurityContext is not required
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/// </summary>
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/// <remarks>
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/// <para>
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/// The <see cref="NullSecurityContext"/> is a no-op implementation of the
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/// <see cref="SecurityContext"/> base class. It is used where a <see cref="SecurityContext"/>
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/// is required but one has not been provided.
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/// </para>
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/// </remarks>
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/// <author>Nicko Cadell</author>
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public sealed class NullSecurityContext : SecurityContext
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{
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/// <summary>
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/// Singleton instance of <see cref="NullSecurityContext"/>
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/// </summary>
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/// <remarks>
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/// <para>
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/// Singleton instance of <see cref="NullSecurityContext"/>
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/// </para>
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/// </remarks>
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public static readonly NullSecurityContext Instance = new NullSecurityContext();
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/// <summary>
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/// Private constructor
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/// </summary>
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/// <remarks>
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/// <para>
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/// Private constructor for singleton pattern.
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/// </para>
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/// </remarks>
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private NullSecurityContext()
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{
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}
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/// <summary>
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/// Impersonate this SecurityContext
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/// </summary>
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/// <param name="state">State supplied by the caller</param>
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/// <returns><c>null</c></returns>
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/// <remarks>
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/// <para>
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/// No impersonation is done and <c>null</c> is always returned.
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/// </para>
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/// </remarks>
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public override IDisposable Impersonate(object state)
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{
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return null;
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}
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}
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}
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