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 using System.Runtime.Serialization;
  38
  39 #if !NET_2_1
  40 using System.Security.AccessControl;
  41 #endif
  42
  43 namespace System.IO {
  44
  45         [Serializable]
  46         [ComVisible (true)]
  47         public sealed class FileInfo : FileSystemInfo
  48         {
  49                 private bool exists;
  50
  51                 public FileInfo (string fileName)
  52                 {
  53                         if (fileName == null)
  54                                 throw new ArgumentNullException ("fileName");
  55
  56                         CheckPath (fileName);
  57
  58                         OriginalPath = fileName;
  59                         FullPath = Path.GetFullPath (fileName);
  60                 }
  61
  62                 private FileInfo (SerializationInfo info, StreamingContext context)
  63                         : base (info, context)
  64                 {
  65                 }
  66
  67                 internal override void InternalRefresh ()
  68                 {
  69                         exists = File.Exists (FullPath);
  70                 }
  71
  72                 // public properties
  73
  74                 public override bool Exists {
  75                         get {
  76                                 Refresh (false);
  77
  78                                 if (stat.Attributes == MonoIO.InvalidFileAttributes)
  79                                         return false;
  80
  81                                 if ((stat.Attributes & FileAttributes.Directory) != 0)
  82                                         return false;
  83
  84                                 return exists;
  85                         }
  86                 }
  87
  88                 public override string Name {
  89                         get {
  90                                 return Path.GetFileName (FullPath);
  91                         }
  92                 }
  93
  94 #if !NET_2_1
  95                 public bool IsReadOnly {
  96                         get {
  97                                 if (!Exists)
  98                                         throw new FileNotFoundException ("Could not find file \"" + OriginalPath + "\".", OriginalPath);
  99
 100                                 return ((stat.Attributes & FileAttributes.ReadOnly) != 0);
 101                         }
 102
 103                         set {
 104                                 if (!Exists)
 105                                         throw new FileNotFoundException ("Could not find file \"" + OriginalPath + "\".", OriginalPath);
 106
 107                                 FileAttributes attrs = File.GetAttributes(FullPath);
 108
 109                                 if (value)
 110                                         attrs |= FileAttributes.ReadOnly;
 111                                 else
 112                                         attrs &= ~FileAttributes.ReadOnly;
 113
 114                                 File.SetAttributes(FullPath, attrs);
 115                         }
 116                 }
 117
 118                 [MonoLimitation ("File encryption isn't supported (even on NTFS).")]
 119                 [ComVisible (false)]
 120                 public void Encrypt ()
 121                 {
 122                         // MS.NET support this only on NTFS file systems, i.e. it's a file-system (not a framework) feature.
 123                         // otherwise it throws a NotSupportedException (or a PlatformNotSupportedException on older OS).
 124                         // we throw the same (instead of a NotImplementedException) because most code should already be
 125                         // handling this exception to work properly.
 126                         throw new NotSupportedException (Locale.GetText ("File encryption isn't supported on any file system."));
 127                 }
 128
 129                 [MonoLimitation ("File encryption isn't supported (even on NTFS).")]
 130                 [ComVisible (false)]
 131                 public void Decrypt ()
 132                 {
 133                         // MS.NET support this only on NTFS file systems, i.e. it's a file-system (not a framework) feature.
 134                         // otherwise it throws a NotSupportedException (or a PlatformNotSupportedException on older OS).
 135                         // we throw the same (instead of a NotImplementedException) because most code should already be
 136                         // handling this exception to work properly.
 137                         throw new NotSupportedException (Locale.GetText ("File encryption isn't supported on any file system."));
 138                 }
 139 #endif
 140
 141                 public long Length {
 142                         get {
 143                                 if (!Exists)
 144                                         throw new FileNotFoundException ("Could not find file \"" + OriginalPath + "\".", OriginalPath);
 145
 146                                 return stat.Length;
 147                         }
 148                 }
 149
 150                 public string DirectoryName {
 151                         get {
 152                                 return Path.GetDirectoryName (FullPath);
 153                         }
 154                 }
 155
 156                 public DirectoryInfo Directory {
 157                         get {
 158                                 return new DirectoryInfo (DirectoryName);
 159                         }
 160                 }
 161
 162                 // streamreader methods
 163
 164                 public StreamReader OpenText ()
 165                 {
 166                         return new StreamReader (Open (FileMode.Open, FileAccess.Read));
 167                 }
 168
 169                 public StreamWriter CreateText ()
 170                 {
 171                         return new StreamWriter (Open (FileMode.Create, FileAccess.Write));
 172                 }
 173
 174                 public StreamWriter AppendText ()
 175                 {
 176                         return new StreamWriter (Open (FileMode.Append, FileAccess.Write));
 177                 }
 178
 179                 // filestream methods
 180
 181                 public FileStream Create ()
 182                 {
 183                         return File.Create (FullPath);
 184                 }
 185
 186                 public FileStream OpenRead ()
 187                 {
 188                         return Open (FileMode.Open, FileAccess.Read, FileShare.Read);
 189                 }
 190
 191                 public FileStream OpenWrite ()
 192                 {
 193                         return Open (FileMode.OpenOrCreate, FileAccess.Write);
 194                 }
 195
 196                 public FileStream Open (FileMode mode)
 197                 {
 198                         return Open (mode, FileAccess.ReadWrite);
 199                 }
 200
 201                 public FileStream Open (FileMode mode, FileAccess access)
 202                 {
 203                         return Open (mode, access, FileShare.None);
 204                 }
 205
 206                 public FileStream Open (FileMode mode, FileAccess access, FileShare share)
 207                 {
 208                         return new FileStream (FullPath, mode, access, share);
 209                 }
 210
 211                 // file methods
 212
 213                 public override void Delete ()
 214                 {
 215                         MonoIOError error;
 216
 217                         if (!MonoIO.Exists (FullPath, out error))
 218                                 // a weird MS.NET behaviour
 219                                 return;
 220
 221                         if (MonoIO.ExistsDirectory (FullPath, out error))
 222                                 throw new UnauthorizedAccessException ("Access to the path \"" + FullPath + "\" is denied.");
 223                         if (!MonoIO.DeleteFile (FullPath, out error))
 224                                 throw MonoIO.GetException (OriginalPath, error);
 225                 }
 226
 227                 public void MoveTo (string destFileName)
 228                 {
 229                         if (destFileName == null)
 230                                 throw new ArgumentNullException ("destFileName");
 231                         if (destFileName == Name || destFileName == FullName)
 232                                 return;
 233                         if (!File.Exists (FullPath))
 234                                 throw new FileNotFoundException ();
 235
 236                         File.Move (FullPath, destFileName);
 237                         this.FullPath = Path.GetFullPath (destFileName);
 238                 }
 239
 240                 public FileInfo CopyTo (string destFileName)
 241                 {
 242                         return CopyTo (destFileName, false);
 243                 }
 244
 245                 public FileInfo CopyTo (string destFileName, bool overwrite)
 246                 {
 247                         if (destFileName == null)
 248                                 throw new ArgumentNullException ("destFileName");
 249                         if (destFileName.Length == 0)
 250                                 throw new ArgumentException ("An empty file name is not valid.", "destFileName");
 251
 252                         string dest = Path.GetFullPath (destFileName);
 253
 254                         if (overwrite && File.Exists (dest))
 255                                 File.Delete (dest);
 256
 257                         File.Copy (FullPath, dest);
 258
 259                         return new FileInfo (dest);
 260                 }
 261
 262                 public override string ToString ()
 263                 {
 264 #if NET_2_1
 265                         // for Moonlight we *never* return paths, since ToString is not [SecurityCritical] we simply return the Name
 266                         return Name;
 267 #else
 268                         return OriginalPath;
 269 #endif
 270                 }
 271
 272 #if !NET_2_1
 273                 public FileSecurity GetAccessControl ()
 274                 {
 275                         throw new NotImplementedException ();
 276                 }
 277
 278                 public FileSecurity GetAccessControl (AccessControlSections includeSections)
 279                 {
 280                         throw new NotImplementedException ();
 281                 }
 282
 283                 [ComVisible (false)]
 284                 public FileInfo Replace (string destinationFileName,
 285                                          string destinationBackupFileName)
 286                 {
 287                         string destinationFullPath = null;
 288                         if (!Exists)
 289                                 throw new FileNotFoundException ();
 290                         if (destinationFileName == null)
 291                                 throw new ArgumentNullException ("destinationFileName");
 292                         if (destinationFileName.Length == 0)
 293                                 throw new ArgumentException ("An empty file name is not valid.", "destinationFileName");
 294
 295                         destinationFullPath = Path.GetFullPath (destinationFileName);
 296
 297                         if (!File.Exists (destinationFullPath))
 298                                 throw new FileNotFoundException ();
 299
 300                         FileAttributes attrs = File.GetAttributes (destinationFullPath);
 301
 302                         if ( (attrs & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
 303                                         throw new UnauthorizedAccessException ();
 304
 305                         if (destinationBackupFileName != null) {
 306                                 if (destinationBackupFileName.Length == 0)
 307                                         throw new ArgumentException ("An empty file name is not valid.", "destinationBackupFileName");
 308                                 File.Copy (destinationFullPath, Path.GetFullPath (destinationBackupFileName), true);
 309                         }
 310                         File.Copy (FullPath, destinationFullPath,true);
 311                         File.Delete (FullPath);
 312                         return new FileInfo (destinationFullPath);
 313                 }
 314
 315                 [ComVisible (false)]
 316                 [MonoLimitation ("We ignore the ignoreMetadataErrors parameter")]
 317                 public FileInfo Replace (string destinationFileName,
 318                                          string destinationBackupFileName,
 319                                          bool ignoreMetadataErrors)
 320                 {
 321                         return Replace (destinationFileName, destinationBackupFileName);
 322                 }
 323
 324                 public void SetAccessControl (FileSecurity fileSecurity)
 325                 {
 326                         throw new NotImplementedException ();
 327                 }
 328 #endif
 329         }
 330 }