//------------------------------------------------------------------------------
// <copyright file="EmptyImpersonationContext.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
 
namespace System.Configuration {
    using System.Configuration.Internal;
    using System.Collections;
    using System.Collections.Specialized;
    using System.Configuration;
    using System.Globalization;
    using System.IO;
    using System.Runtime.InteropServices;
    using System.Security.Permissions;
    using System.Security;
    using System.Text;
    using System.Xml;
 
    // An impersonation context that does nothing
    // Used in cases where the Host does not require impersonation.
    class EmptyImpersonationContext : IDisposable {
        static volatile IDisposable s_emptyImpersonationContext;
 
        static internal IDisposable GetStaticInstance() {
            if (s_emptyImpersonationContext == null) {
                s_emptyImpersonationContext = new EmptyImpersonationContext();
            }
 
            return s_emptyImpersonationContext;
        }
 
        public void Dispose() {}
    }
}