|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.IO;
namespace System.Configuration
{
/// <summary>
/// Holds the configuration file mapping for machine.config. It is the base class for
/// ExeConfigurationFileMap and WebConfigurationFileMap.
/// </summary>
public class ConfigurationFileMap : ICloneable
{
// This used to be two fields: one containing the filename and the other containing
// a Boolean dictating whether a security check needed to take place. Such a pattern wasn't thread-safe
// and could be circumvented by malicious callers. Using a single reference field is guaranteed atomic
// read and write across all platforms, so the race condition is eliminated.
private Func<string> _getFilenameThunk;
public ConfigurationFileMap()
{
_getFilenameThunk = GetFilenameFromMachineConfigFilePath;
}
public ConfigurationFileMap(string machineConfigFilename)
{
if (string.IsNullOrEmpty(machineConfigFilename))
throw new ArgumentNullException(nameof(machineConfigFilename));
if (!File.Exists(machineConfigFilename))
throw new ArgumentException(SR.Format(SR.Machine_config_file_not_found, machineConfigFilename),
nameof(machineConfigFilename));
MachineConfigFilename = machineConfigFilename;
}
// copy ctor used only for cloning
private ConfigurationFileMap(ConfigurationFileMap other)
{
_getFilenameThunk = other._getFilenameThunk;
}
public string MachineConfigFilename
{
get { return _getFilenameThunk(); }
set { _getFilenameThunk = () => value; }
}
public virtual object Clone()
{
return new ConfigurationFileMap(this);
}
private static string GetFilenameFromMachineConfigFilePath()
{
return ClientConfigurationHost.MachineConfigFilePath;
}
internal bool IsMachinePathDefault => _getFilenameThunk == GetFilenameFromMachineConfigFilePath;
}
}
|