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