NTFSSecurity/AlphaFS/Filesystem/File Class/File.GetLastWriteTime.cs

/*  Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
 *  
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 *  of this software and associated documentation files (the "Software"), to deal 
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using System;
using System.Security;

namespace Alphaleonis.Win32.Filesystem
{
   public static partial class File
   {
      #region GetLastWriteTime

      /// <summary>Gets the date and time that the specified file was last written to.</summary>
      /// <param name="path">The file for which to obtain write date and time information.</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file was last written to. This value is
      ///   expressed in local time.
      /// </returns>
      [SecurityCritical]
      public static DateTime GetLastWriteTime(string path)
      {
         return GetLastWriteTimeCore(null, path, false, PathFormat.RelativePath).ToLocalTime();
      }

      /// <summary>[AlphaFS] Gets the date and time that the specified file was last written to.</summary>
      /// <param name="path">The file for which to obtain write date and time information.</param>
      /// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file was last written to. This value is
      ///   expressed in local time.
      /// </returns>
      [SecurityCritical]
      public static DateTime GetLastWriteTime(string path, PathFormat pathFormat)
      {
         return GetLastWriteTimeCore(null, path, false, pathFormat).ToLocalTime();
      }


      #region Transactional

      /// <summary>[AlphaFS] Gets the date and time that the specified file was last written to.</summary>
      /// <param name="transaction">The transaction.</param>
      /// <param name="path">The file for which to obtain write date and time information.</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file was last written to. This value is
      ///   expressed in local time.
      /// </returns>
      [SecurityCritical]
      public static DateTime GetLastWriteTimeTransacted(KernelTransaction transaction, string path)
      {
         return GetLastWriteTimeCore(transaction, path, false, PathFormat.RelativePath).ToLocalTime();
      }

      /// <summary>[AlphaFS] Gets the date and time that the specified file was last written to.</summary>
      /// <param name="transaction">The transaction.</param>
      /// <param name="path">The file for which to obtain write date and time information.</param>
      /// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file was last written to. This value is
      ///   expressed in local time.
      /// </returns>
      [SecurityCritical]
      public static DateTime GetLastWriteTimeTransacted(KernelTransaction transaction, string path, PathFormat pathFormat)
      {
         return GetLastWriteTimeCore(transaction, path, false, pathFormat).ToLocalTime();
      }


      #endregion // Transacted


      #endregion // GetLastWriteTime

      #region GetLastWriteTimeUtc

      /// <summary>Gets the date and time, in coordinated universal time (UTC) time, that the specified file was last written to.</summary>
      /// <param name="path">The file for which to obtain write date and time information.</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file was last written to. This value is
      ///   expressed in UTC time.
      /// </returns>
      [SecurityCritical]
      public static DateTime GetLastWriteTimeUtc(string path)
      {
         return GetLastWriteTimeCore(null, path, true, PathFormat.RelativePath);
      }

      /// <summary>
      ///   [AlphaFS] Gets the date and time, in coordinated universal time (UTC) time, that the specified file was last written to.
      /// </summary>
      /// <param name="path">The file for which to obtain write date and time information.</param>
      /// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file was last written to. This value is
      ///   expressed in UTC time.
      /// </returns>
      [SecurityCritical]
      public static DateTime GetLastWriteTimeUtc(string path, PathFormat pathFormat)
      {
         return GetLastWriteTimeCore(null, path, true, pathFormat);
      }


      #region Transactional

      /// <summary>
      ///   [AlphaFS] Gets the date and time, in coordinated universal time (UTC) time, that the specified file was last written to.
      /// </summary>
      /// <param name="transaction">The transaction.</param>
      /// <param name="path">The file for which to obtain write date and time information.</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file was last written to. This value is
      ///   expressed in UTC time.
      /// </returns>
      [SecurityCritical]
      public static DateTime GetLastWriteTimeUtcTransacted(KernelTransaction transaction, string path)
      {
         return GetLastWriteTimeCore(transaction, path, true, PathFormat.RelativePath);
      }

      /// <summary>
      ///   [AlphaFS] Gets the date and time, in coordinated universal time (UTC) time, that the specified file was last written to.
      /// </summary>
      /// <param name="transaction">The transaction.</param>
      /// <param name="path">The file for which to obtain write date and time information.</param>
      /// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file was last written to. This value is
      ///   expressed in UTC time.
      /// </returns>
      [SecurityCritical]
      public static DateTime GetLastWriteTimeUtcTransacted(KernelTransaction transaction, string path, PathFormat pathFormat)
      {
         return GetLastWriteTimeCore(transaction, path, true, pathFormat);
      }

      #endregion // Transacted


      #endregion // GetLastWriteTimeUtc

      #region Internal Methods

      /// <summary>
      ///   [AlphaFS] Gets the date and time, in coordinated universal time (UTC) or local time, that the specified file or directory was last
      ///   written to.
      /// </summary>
      /// <param name="transaction">The transaction.</param>
      /// <param name="path">The file or directory for which to obtain write date and time information.</param>
      /// <param name="getUtc">
      ///   <see langword="true"/> gets the Coordinated Universal Time (UTC), <see langword="false"/> gets the local time.
      /// </param>
      /// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
      /// <returns>
      ///   A <see cref="System.DateTime"/> structure set to the date and time that the specified file or directory was last written to.
      ///   Depending on <paramref name="getUtc"/> this value is expressed in UTC- or local time.
      /// </returns>
      [SecurityCritical]
      internal static DateTime GetLastWriteTimeCore(KernelTransaction transaction, string path, bool getUtc, PathFormat pathFormat)
      {
         NativeMethods.FILETIME lastWriteTime = GetAttributesExCore<NativeMethods.WIN32_FILE_ATTRIBUTE_DATA>(transaction, path, pathFormat, false).ftLastWriteTime;

         return getUtc
            ? DateTime.FromFileTimeUtc(lastWriteTime)
            : DateTime.FromFileTime(lastWriteTime);
      }

      #endregion // Internal Methods
   }
}