mcs/class/corlib/System.IO/FileInfo.cs

   1 //------------------------------------------------------------------------------
   2 //
   3 // System.IO.FileInfo.cs
   4 //
   5 // Copyright (C) 2001 Moonlight Enterprises, All Rights Reserved
   6 //
   7 // Author:         Jim Richardson, develop@wtfo-guru.com
   8 //                 Dan Lewis (dihlewis@yahoo.co.uk)
   9 // Created:        Monday, August 13, 2001
  10 //
  11 //------------------------------------------------------------------------------
  12
  13 //
  14 // Copyright (C) 2004, 2006 Novell, Inc (http://www.novell.com)
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 using System.Runtime.InteropServices;
  37
  38 namespace System.IO {
  39
  40         [Serializable]
  41 #if NET_2_0
  42         [ComVisible (true)]
  43 #endif
  44         public sealed class FileInfo : FileSystemInfo {
  45
  46
  47                 private bool exists;
  48
  49                 public FileInfo (string path) {
  50                         CheckPath (path);
  51
  52                         OriginalPath = path;
  53                         FullPath = Path.GetFullPath (path);
  54                 }
  55
  56                 internal override void InternalRefresh ()
  57                 {
  58                         exists = File.Exists (FullPath);
  59                 }
  60
  61
  62                 // public properties
  63
  64                 public override bool Exists {
  65                         get {
  66                                 Refresh (false);
  67
  68                                 if (stat.Attributes == MonoIO.InvalidFileAttributes)
  69                                         return false;
  70
  71                                 if ((stat.Attributes & FileAttributes.Directory) != 0)
  72                                         return false;
  73
  74                                 return exists;
  75                         }
  76                 }
  77
  78                 public override string Name {
  79                         get {
  80                                 return Path.GetFileName (FullPath);
  81                         }
  82                 }
  83
  84 #if NET_2_0
  85                 public bool IsReadOnly {
  86                         get {
  87                                 if (!Exists)
  88                                         throw new FileNotFoundException ("Could not find file \"" + OriginalPath + "\".", OriginalPath);
  89
  90                                 return ((stat.Attributes & FileAttributes.ReadOnly) != 0);
  91                         }
  92
  93                         set {
  94                                 if (!Exists)
  95                                         throw new FileNotFoundException ("Could not find file \"" + OriginalPath + "\".", OriginalPath);
  96
  97                                 FileAttributes attrs = File.GetAttributes(FullPath);
  98
  99                                 if (value)
 100                                         attrs |= FileAttributes.ReadOnly;
 101                                 else
 102                                         attrs &= ~FileAttributes.ReadOnly;
 103
 104                                 File.SetAttributes(FullPath, attrs);
 105                         }
 106                 }
 107
 108                 [MonoLimitation ("File encryption isn't supported (even on NTFS).")]
 109                 [ComVisible (false)]
 110                 public void Encrypt ()
 111                 {
 112                         // MS.NET support this only on NTFS file systems, i.e. it's a file-system (not a framework) feature.
 113                         // otherwise it throws a NotSupportedException (or a PlatformNotSupportedException on older OS).
 114                         // we throw the same (instead of a NotImplementedException) because most code should already be
 115                         // handling this exception to work properly.
 116                         throw new NotSupportedException (Locale.GetText ("File encryption isn't supported on any file system."));
 117                 }
 118
 119                 [MonoLimitation ("File encryption isn't supported (even on NTFS).")]
 120                 [ComVisible (false)]
 121                 public void Decrypt ()
 122                 {
 123                         // MS.NET support this only on NTFS file systems, i.e. it's a file-system (not a framework) feature.
 124                         // otherwise it throws a NotSupportedException (or a PlatformNotSupportedException on older OS).
 125                         // we throw the same (instead of a NotImplementedException) because most code should already be
 126                         // handling this exception to work properly.
 127                         throw new NotSupportedException (Locale.GetText ("File encryption isn't supported on any file system."));
 128                 }
 129 #endif
 130
 131                 public long Length {
 132                         get {
 133                                 if (!Exists)
 134                                         throw new FileNotFoundException ("Could not find file \"" + OriginalPath + "\".", OriginalPath);
 135
 136                                 return stat.Length;
 137                         }
 138                 }
 139
 140                 public string DirectoryName {
 141                         get {
 142                                 return Path.GetDirectoryName (FullPath);
 143                         }
 144                 }
 145
 146                 public DirectoryInfo Directory {
 147                         get {
 148                                 return new DirectoryInfo (DirectoryName);
 149                         }
 150                 }
 151
 152                 // streamreader methods
 153
 154                 public StreamReader OpenText () {
 155                         return new StreamReader (Open (FileMode.Open, FileAccess.Read));
 156                 }
 157
 158                 public StreamWriter CreateText () {
 159                         return new StreamWriter (Open (FileMode.Create, FileAccess.Write));
 160                 }
 161
 162                 public StreamWriter AppendText () {
 163                         return new StreamWriter (Open (FileMode.Append, FileAccess.Write));
 164                 }
 165
 166                 // filestream methods
 167
 168                 public FileStream Create ()
 169                 {
 170                         return File.Create (FullPath);
 171                 }
 172
 173
 174                 public FileStream OpenRead () {
 175                         return Open (FileMode.Open, FileAccess.Read, FileShare.Read);
 176                 }
 177
 178                 public FileStream OpenWrite () {
 179                         return Open (FileMode.OpenOrCreate, FileAccess.Write);
 180                 }
 181
 182                 public FileStream Open (FileMode mode) {
 183                         return Open (mode, FileAccess.ReadWrite);
 184                 }
 185
 186                 public FileStream Open (FileMode mode, FileAccess access) {
 187                         return Open (mode, access, FileShare.None);
 188                 }
 189
 190                 public FileStream Open (FileMode mode, FileAccess access, FileShare share) {
 191                         return new FileStream (FullPath, mode, access, share);
 192                 }
 193
 194                 // file methods
 195
 196                 public override void Delete () {
 197                         MonoIOError error;
 198
 199                         if (!MonoIO.Exists (FullPath, out error)) {
 200                                 // a weird MS.NET behaviour
 201                                 return;
 202                         }
 203
 204                         if (MonoIO.ExistsDirectory (FullPath, out error)) {
 205                                 throw new UnauthorizedAccessException ("Access to the path \"" + FullPath + "\" is denied.");
 206                         }
 207
 208                         if (!MonoIO.DeleteFile (FullPath, out error)) {
 209                                 throw MonoIO.GetException (OriginalPath,
 210                                                            error);
 211                         }
 212                 }
 213
 214                 public void MoveTo (string dest) {
 215
 216                         if (dest == null)
 217                                 throw new ArgumentNullException ();
 218
 219                         if (dest == Name || dest == FullName)
 220                                 return;
 221
 222                         MonoIOError error;
 223                         if (MonoIO.Exists (dest, out error) ||
 224                                 MonoIO.ExistsDirectory (dest, out error))
 225                                 throw new IOException ();
 226                         File.Move (FullPath, dest);
 227                         this.FullPath = Path.GetFullPath (dest);
 228                 }
 229
 230                 public FileInfo CopyTo (string path) {
 231                         return CopyTo (path, false);
 232                 }
 233
 234                 public FileInfo CopyTo (string path, bool overwrite) {
 235                         string dest = Path.GetFullPath (path);
 236
 237                         if (overwrite && File.Exists (path))
 238                                 File.Delete (path);
 239
 240                         File.Copy (FullPath, dest);
 241
 242                         return new FileInfo (dest);
 243                 }
 244
 245                 public override string ToString () {
 246                         return OriginalPath;
 247                 }
 248         }
 249 }