Util/FileSystem.cs

   1 //
   2 // FileSystem.cs
   3 //
   4 // Copyright (C) 2004 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.IO;
  29
  30 namespace Beagle.Util {
  31
  32         public class FileSystem {
  33
  34                 static public bool Exists (string path)
  35                 {
  36                         return File.Exists (path) || Directory.Exists (path);
  37                 }
  38
  39                 static public DateTime GetLastWriteTimeUtc (string path)
  40                 {
  41                         if (path == null)
  42                                 throw new ArgumentNullException ("path");
  43
  44                         if (File.Exists (path))
  45                                 return File.GetLastWriteTimeUtc (path);
  46                         else if (Directory.Exists (path))
  47                                 return Directory.GetLastWriteTimeUtc (path);
  48                         else
  49                                 throw new FileNotFoundException (path);
  50                 }
  51
  52                 static public FileSystemInfo New (string path)
  53                 {
  54                         if (Directory.Exists (path))
  55                                 return new DirectoryInfo (path);
  56                         return new FileInfo (path);
  57                 }
  58
  59                 // I guess this is as good a place for this as any.
  60                 static public bool IsSymLink (string path)
  61                 {
  62                         Mono.Unix.Native.Stat stat;
  63                         Mono.Unix.Native.Syscall.lstat (path, out stat);
  64                         return (stat.st_mode & Mono.Unix.Native.FilePermissions.S_IFLNK) == Mono.Unix.Native.FilePermissions.S_IFLNK;
  65                 }
  66
  67
  68                 static public bool IsSpecialFile (string path)
  69                 {
  70                         Mono.Unix.Native.Stat stat;
  71                         Mono.Unix.Native.Syscall.lstat (path, out stat);
  72
  73                         Mono.Unix.Native.FilePermissions type = (stat.st_mode & Mono.Unix.Native.FilePermissions.S_IFMT);
  74
  75                         if (type == Mono.Unix.Native.FilePermissions.S_IFLNK
  76                             || type == Mono.Unix.Native.FilePermissions.S_IFCHR
  77                             || type == Mono.Unix.Native.FilePermissions.S_IFBLK
  78                             || type == Mono.Unix.Native.FilePermissions.S_IFIFO
  79                             || type == Mono.Unix.Native.FilePermissions.S_IFSOCK)
  80                                 return true;
  81
  82                         return false;
  83                 }
  84
  85                 public static bool IsWritable (string path)
  86                 {
  87                         Mono.Unix.Native.Stat stat;
  88                         Mono.Unix.Native.Syscall.lstat (path, out stat);
  89
  90                         Mono.Unix.Native.FilePermissions type = (stat.st_mode & Mono.Unix.Native.FilePermissions.S_IFMT);
  91
  92                         if (type == Mono.Unix.Native.FilePermissions.S_IWUSR
  93                             || type == Mono.Unix.Native.FilePermissions.S_IWGRP
  94                             || type == Mono.Unix.Native.FilePermissions.S_IWOTH)
  95                                 return true;
  96
  97                         return false;
  98                 }
  99
 100                 // Special version of this function which handles the root directory.
 101                 static public string GetDirectoryNameRootOk (string path)
 102                 {
 103                         // System.IO.Path.GetDirectoryName ("/") returns null.
 104                         // Handle it specially.
 105                         if (path == "/")
 106                                 return path;
 107
 108                         return System.IO.Path.GetDirectoryName (path);
 109                 }
 110         }
 111
 112 }