Source for java.io.File

   1: /* File.java -- Class representing a file on disk
   2:    Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005
   3:    Free Software Foundation, Inc.
   4: 
   5: This file is part of GNU Classpath.
   6: 
   7: GNU Classpath is free software; you can redistribute it and/or modify
   8: it under the terms of the GNU General Public License as published by
   9: the Free Software Foundation; either version 2, or (at your option)
  10: any later version.
  11:  
  12: GNU Classpath is distributed in the hope that it will be useful, but
  13: WITHOUT ANY WARRANTY; without even the implied warranty of
  14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15: General Public License for more details.
  16: 
  17: You should have received a copy of the GNU General Public License
  18: along with GNU Classpath; see the file COPYING.  If not, write to the
  19: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20: 02110-1301 USA.
  21: 
  22: Linking this library statically or dynamically with other modules is
  23: making a combined work based on this library.  Thus, the terms and
  24: conditions of the GNU General Public License cover the whole
  25: combination.
  26: 
  27: As a special exception, the copyright holders of this library give you
  28: permission to link this library with independent modules to produce an
  29: executable, regardless of the license terms of these independent
  30: modules, and to copy and distribute the resulting executable under
  31: terms of your choice, provided that you also meet, for each linked
  32: independent module, the terms and conditions of the license of that
  33: module.  An independent module is a module which is not derived from
  34: or based on this library.  If you modify this library, you may extend
  35: this exception to your version of the library, but you are not
  36: obligated to do so.  If you do not wish to do so, delete this
  37: exception statement from your version. */
  38: 
  39: 
  40: package java.io;
  41: 
  42: import gnu.classpath.SystemProperties;
  43: 
  44: import java.net.MalformedURLException;
  45: import java.net.URI;
  46: import java.net.URISyntaxException;
  47: import java.net.URL;
  48: 
  49: /* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
  50:  * "The Java Language Specification", ISBN 0-201-63451-1
  51:  * Status:  Complete to version 1.3.
  52:  */
  53: 
  54: /**
  55:  * This class represents a file or directory on a local disk.  It provides
  56:  * facilities for dealing with a variety of systems that use various
  57:  * types of path separators ("/" versus "\", for example).  It also
  58:  * contains method useful for creating and deleting files and directories.
  59:  *
  60:  * @author Aaron M. Renn (arenn@urbanophile.com)
  61:  * @author Tom Tromey (tromey@cygnus.com)
  62:  */
  63: public class File implements Serializable, Comparable
  64: {
  65:   private static final long serialVersionUID = 301077366599181567L;
  66: 
  67:   /**
  68:    * This is the path separator string for the current host. This field
  69:    * contains the value of the <code>file.separator</code> system property.
  70:    * An example separator string would be "/" on the GNU system.
  71:    */
  72:   public static final String separator = SystemProperties.getProperty("file.separator");
  73:   private static final String dupSeparator = separator + separator;
  74: 
  75:   /**
  76:    * This is the first character of the file separator string.  On many
  77:    * hosts (for example, on the GNU system), this represents the entire 
  78:    * separator string.  The complete separator string is obtained from the
  79:    * <code>file.separator</code>system property.
  80:    */
  81:   public static final char separatorChar = separator.charAt(0);
  82:   
  83:   /**
  84:    * This is the string that is used to separate the host name from the
  85:    * path name in paths than include the host name.  It is the value of
  86:    * the <code>path.separator</code> system property.
  87:    */
  88:   public static final String pathSeparator
  89:     = SystemProperties.getProperty("path.separator");
  90:   
  91:   /**
  92:    * This is the first character of the string used to separate the host name
  93:    * from the path name in paths that include a host.  The separator string
  94:    * is taken from the <code>path.separator</code> system property.
  95:    */
  96:   public static final char pathSeparatorChar = pathSeparator.charAt(0);
  97: 
  98:   /**
  99:    * This is the path to the file set when the object is created.  It
 100:    * may be an absolute or relative path name.
 101:    */
 102:   private String path;
 103:   
 104:   
 105:   /**
 106:    * The time (millisecond), when the last temporary file was created.
 107:    */
 108:   private static long last_tmp;
 109:   
 110:   /**
 111:    * The number of files, created during the current millisecond.
 112:    */
 113:   private static int n_created;  
 114: 
 115:   /**
 116:    * This method tests whether or not the current thread is allowed to
 117:    * to read the file pointed to by this object.  This will be true if and
 118:    * and only if 1) the file exists and 2) the <code>SecurityManager</code>
 119:    * (if any) allows access to the file via it's <code>checkRead</code>
 120:    * method 3) the file is readable.
 121:    *
 122:    * @return <code>true</code> if reading is allowed, 
 123:    * <code>false</code> otherwise
 124:    *
 125:    * @exception SecurityException If the <code>SecurityManager</code> 
 126:    * does not allow access to the file
 127:    */
 128:   public boolean canRead()
 129:   {
 130:     // Test for existence. This also does the SecurityManager check
 131:     if (!exists())
 132:       return false;
 133: 
 134:     return VMFile.canRead(path);
 135:   }
 136: 
 137:   /**
 138:    * This method test whether or not the current thread is allowed to
 139:    * write to this object.  This will be true if and only if 1) The
 140:    * <code>SecurityManager</code> (if any) allows write access to the
 141:    * file and 2) The file exists and 3) The file is writable.  To determine
 142:    * whether or not a non-existent file can be created, check the parent
 143:    * directory for write access.
 144:    *
 145:    * @return <code>true</code> if writing is allowed, <code>false</code> 
 146:    * otherwise
 147:    *
 148:    * @exception SecurityException If the <code>SecurityManager</code> 
 149:    * does not allow access to the file
 150:    */
 151:   public boolean canWrite()
 152:   {
 153:     // First do a SecurityCheck before doing anything else.
 154:     checkWrite();
 155:      
 156:     // Test for existence.  This is required by the spec
 157:     if (! VMFile.exists(path))
 158:       return false;
 159: 
 160:     if (VMFile.isDirectory(path))
 161:       return VMFile.canWriteDirectory(this);
 162:     else
 163:       return VMFile.canWrite(path);
 164:   }
 165: 
 166:   /**
 167:    * This method creates a new file of zero length with the same name as
 168:    * the path of this <code>File</code> object if an only if that file
 169:    * does not already exist.
 170:    * <p>
 171:    * A <code>SecurityManager.checkWrite</code> check is done prior
 172:    * to performing this action.
 173:    *
 174:    * @return <code>true</code> if the file was created, <code>false</code> if
 175:    * the file alread existed.
 176:    *
 177:    * @exception IOException If an I/O error occurs
 178:    * @exception SecurityException If the <code>SecurityManager</code> will
 179:    * not allow this operation to be performed.
 180:    *
 181:    * @since 1.2
 182:    */
 183:   public boolean createNewFile() throws IOException
 184:   {
 185:     checkWrite();
 186:     return VMFile.create(path);
 187:   }
 188:   /**
 189:    * This method deletes the file represented by this object.  If this file
 190:    * is a directory, it must be empty in order for the delete to succeed.
 191:    *
 192:    * @return <code>true</code> if the file was deleted, <code>false</code> 
 193:    * otherwise
 194:    *
 195:    * @exception SecurityException If deleting of the file is not allowed
 196:    */
 197:   public synchronized boolean delete()
 198:   {
 199:     SecurityManager s = System.getSecurityManager();
 200:     
 201:     if (s != null)
 202:       s.checkDelete(path);
 203:     
 204:     return VMFile.delete(path);
 205:   }
 206: 
 207:   /**
 208:    * This method tests two <code>File</code> objects for equality by 
 209:    * comparing the path of the specified <code>File</code> against the path
 210:    * of this object.  The two objects are equal if an only if 1) The
 211:    * argument is not null 2) The argument is a <code>File</code> object and
 212:    * 3) The path of the <code>File</code>argument is equal to the path
 213:    * of this object.
 214:    * <p>
 215:    * The paths of the files are determined by calling the 
 216:    * <code>getPath()</code>
 217:    * method on each object.
 218:    *
 219:    * @return <code>true</code> if the two objects are equal, 
 220:    * <code>false</code> otherwise.
 221:    */
 222:   public boolean equals(Object obj)
 223:   {
 224:     if (! (obj instanceof File))
 225:       return false;
 226:     
 227:     File other = (File) obj;
 228: 
 229:     if (VMFile.IS_CASE_SENSITIVE)
 230:       return path.equals(other.path);
 231:     else
 232:       return path.equalsIgnoreCase(other.path);
 233:   }
 234: 
 235:   /**
 236:    * This method tests whether or not the file represented by the object
 237:    * actually exists on the filesystem.
 238:    *
 239:    * @return <code>true</code> if the file exists, <code>false</code>otherwise.
 240:    *
 241:    * @exception SecurityException If reading of the file is not permitted
 242:    */
 243:   public boolean exists()
 244:   {
 245:     checkRead();
 246:     return VMFile.exists(path);
 247:   }
 248: 
 249:   /**
 250:    * This method initializes a new <code>File</code> object to represent
 251:    * a file with the specified path.
 252:    *
 253:    * @param name The path name of the file
 254:    */
 255:   public File(String name)
 256:   {
 257:     path = normalizePath (name);
 258:   }
 259:  
 260:   // Remove duplicate and redundant separator characters.
 261:   private String normalizePath(String p)
 262:   {
 263:     // On Windows, convert any '/' to '\'.  This appears to be the same logic
 264:     // that Sun's Win32 Java performs.
 265:     if (separatorChar == '\\')
 266:       {
 267:         p = p.replace ('/', '\\');
 268:     // We have to special case the "\c:" prefix.
 269:     if (p.length() > 2 && p.charAt(0) == '\\' &&
 270:         ((p.charAt(1) >= 'a' && p.charAt(1) <= 'z') ||
 271:         (p.charAt(1) >= 'A' && p.charAt(1) <= 'Z')) &&
 272:         p.charAt(2) == ':')
 273:       p = p.substring(1);
 274:       }
 275: 
 276:     int dupIndex = p.indexOf(dupSeparator);
 277:     int plen = p.length();
 278: 
 279:     // Special case: permit Windows UNC path prefix.
 280:     if (dupSeparator.equals("\\\\") && dupIndex == 0)
 281:       dupIndex = p.indexOf(dupSeparator, 1);
 282: 
 283:     if (dupIndex == -1)
 284:       {
 285:         // Ignore trailing separator (though on Windows "a:\", for
 286:         // example, is a valid and minimal path).
 287:         if (plen > 1 && p.charAt (plen - 1) == separatorChar)
 288:       {
 289:         if (! (separatorChar == '\\' && plen == 3 && p.charAt (1) == ':'))
 290:           return p.substring (0, plen - 1);
 291:       }
 292:     else
 293:       return p;
 294:       }
 295:     
 296:     StringBuffer newpath = new StringBuffer(plen);
 297:     int last = 0;
 298:     while (dupIndex != -1)
 299:       {
 300:         newpath.append(p.substring(last, dupIndex));
 301:     // Ignore the duplicate path characters.
 302:     while (p.charAt(dupIndex) == separatorChar)
 303:       {
 304:         dupIndex++;
 305:         if (dupIndex == plen)
 306:           return newpath.toString();
 307:       }
 308:     newpath.append(separatorChar);
 309:     last = dupIndex;
 310:     dupIndex = p.indexOf(dupSeparator, last);
 311:       }
 312:     
 313:     // Again, ignore possible trailing separator (except special cases
 314:     // like "a:\" on Windows).
 315:     int end;
 316:     if (plen > 1 && p.charAt (plen - 1) == separatorChar)
 317:     {
 318:       if (separatorChar == '\\' && plen == 3 && p.charAt (1) == ':')
 319:         end = plen;
 320:       else
 321:         end = plen - 1;
 322:     }
 323:     else
 324:       end = plen;
 325:     newpath.append(p.substring(last, end));
 326:     
 327:     return newpath.toString();
 328:   }
 329:  
 330:   /**
 331:    * This method initializes a new <code>File</code> object to represent
 332:    * a file in the specified named directory.  The path name to the file
 333:    * will be the directory name plus the separator string plus the file
 334:    * name.  If the directory path name ends in the separator string, another
 335:    * separator string will still be appended.
 336:    *
 337:    * @param dirPath The path to the directory the file resides in
 338:    * @param name The name of the file
 339:    */
 340:   public File(String dirPath, String name)
 341:   {
 342:     if (name == null)
 343:       throw new NullPointerException();
 344:     if (dirPath != null)
 345:       {
 346:     if (dirPath.length() > 0)
 347:       {
 348:         // Try to be smart about the number of separator characters.
 349:         if (dirPath.charAt(dirPath.length() - 1) == separatorChar
 350:         || name.length() == 0)
 351:           path = normalizePath(dirPath + name);
 352:         else
 353:           path = normalizePath(dirPath + separatorChar + name);
 354:       }
 355:     else
 356:       {
 357:         // If dirPath is empty, use a system dependant
 358:         // default prefix.
 359:         // Note that the leading separators in name have
 360:         // to be chopped off, to prevent them forming
 361:         // a UNC prefix on Windows.
 362:         if (separatorChar == '\\' /* TODO use ON_WINDOWS */)
 363:           {
 364:         int skip = 0;
 365:         while(name.length() > skip
 366:             && (name.charAt(skip) == separatorChar
 367:             || name.charAt(skip) == '/'))
 368:           {
 369:             skip++;
 370:           }
 371:         name = name.substring(skip);
 372:           }
 373:         path = normalizePath(separatorChar + name);
 374:       }
 375:       }
 376:     else
 377:       path = normalizePath(name);
 378:   }
 379: 
 380:   /**
 381:    * This method initializes a new <code>File</code> object to represent
 382:    * a file in the specified directory.  If the <code>directory</code>
 383:    * argument is <code>null</code>, the file is assumed to be in the
 384:    * current directory as specified by the <code>user.dir</code> system
 385:    * property
 386:    *
 387:    * @param directory The directory this file resides in
 388:    * @param name The name of the file
 389:    */
 390:   public File(File directory, String name)
 391:   {
 392:     this (directory == null ? null : directory.path, name);
 393:   }
 394: 
 395:   /**
 396:    * This method initializes a new <code>File</code> object to represent
 397:    * a file corresponding to the specified <code>file:</code> protocol URI.
 398:    *
 399:    * @param uri The URI
 400:    * @throws IllegalArgumentException if the URI is not hierarchical
 401:    */
 402:   public File(URI uri)
 403:   {
 404:     if (uri == null)
 405:     throw new NullPointerException("uri is null");
 406: 
 407:     if (!uri.getScheme().equals("file"))
 408:     throw new IllegalArgumentException("invalid uri protocol");
 409: 
 410:     String name = uri.getPath();
 411:     if (name == null)
 412:       throw new IllegalArgumentException("URI \"" + uri
 413:                      + "\" is not hierarchical");
 414:     path = normalizePath(name);
 415:   }
 416: 
 417:   /**
 418:    * This method returns the path of this file as an absolute path name.
 419:    * If the path name is already absolute, then it is returned.  Otherwise
 420:    * the value returned is the current directory plus the separatory
 421:    * string plus the path of the file.  The current directory is determined
 422:    * from the <code>user.dir</code> system property.
 423:    *
 424:    * @return The absolute path of this file
 425:    */
 426:   public String getAbsolutePath()
 427:   {
 428:     if (isAbsolute())
 429:       return path;
 430:     else if (separatorChar == '\\' 
 431:              && path.length() > 0 && path.charAt (0) == '\\')
 432:       {
 433:         // On Windows, even if the path starts with a '\\' it is not
 434:         // really absolute until we prefix the drive specifier from
 435:         // the current working directory to it.
 436:         return System.getProperty ("user.dir").substring (0, 2) + path;
 437:       }
 438:     else if (separatorChar == '\\' 
 439:              && path.length() > 1 && path.charAt (1) == ':'
 440:              && ((path.charAt (0) >= 'a' && path.charAt (0) <= 'z')
 441:                  || (path.charAt (0) >= 'A' && path.charAt (0) <= 'Z')))
 442:       {
 443:         // On Windows, a process has a current working directory for
 444:         // each drive and a path like "G:foo\bar" would mean the 
 445:         // absolute path "G:\wombat\foo\bar" if "\wombat" is the 
 446:         // working directory on the G drive.
 447:         String drvDir = null;
 448:         try
 449:           {
 450:             drvDir = new File (path.substring (0, 2)).getCanonicalPath();
 451:           }
 452:         catch (IOException e)
 453:           {
 454:             drvDir = path.substring (0, 2) + "\\";
 455:           }
 456:         
 457:         // Note: this would return "C:\\." for the path "C:.", if "\"
 458:         // is the working folder on the C drive, but this is 
 459:         // consistent with what Sun's JRE 1.4.1.01 actually returns!
 460:         if (path.length() > 2)
 461:           return drvDir + '\\' + path.substring (2, path.length());
 462:         else
 463:           return drvDir;
 464:       }
 465:     else if (path.equals(""))
 466:       return System.getProperty ("user.dir");
 467:     else
 468:       return System.getProperty ("user.dir") + separatorChar + path;
 469:   }
 470: 
 471:   /**
 472:    * This method returns a <code>File</code> object representing the
 473:    * absolute path of this object.
 474:    *
 475:    * @return A <code>File</code> with the absolute path of the object.
 476:    *
 477:    * @since 1.2
 478:    */
 479:   public File getAbsoluteFile()
 480:   {
 481:     return new File(getAbsolutePath());
 482:   }
 483: 
 484:   /**
 485:    * This method returns a canonical representation of the pathname of
 486:    * this file.  The actual form of the canonical representation is
 487:    * different.  On the GNU system, the canonical form differs from the
 488:    * absolute form in that all relative file references to "." and ".."
 489:    * are resolved and removed.
 490:    * <p>
 491:    * Note that this method, unlike the other methods which return path
 492:    * names, can throw an IOException.  This is because native method 
 493:    * might be required in order to resolve the canonical path
 494:    *
 495:    * @exception IOException If an error occurs
 496:    */
 497:   public String getCanonicalPath() throws IOException
 498:   {
 499:     // On Windows, getAbsolutePath might end up calling us, so we
 500:     // have to special case that call to avoid infinite recursion.
 501:     if (separatorChar == '\\' && path.length() == 2 &&
 502:     ((path.charAt(0) >= 'a' && path.charAt(0) <= 'z') ||
 503:      (path.charAt(0) >= 'A' && path.charAt(0) <= 'Z')) &&
 504:     path.charAt(1) == ':')
 505:     {
 506:     return VMFile.toCanonicalForm(path);
 507:     }
 508:     // Call getAbsolutePath first to make sure that we do the
 509:     // current directory handling, because the native code
 510:     // may have a different idea of the current directory.
 511:     return VMFile.toCanonicalForm(getAbsolutePath());
 512:   }
 513: 
 514:   /**
 515:    * This method returns a <code>File</code> object representing the
 516:    * canonical path of this object.
 517:    *
 518:    * @return A <code>File</code> instance representing the canonical path of
 519:    * this object.
 520:    *
 521:    * @exception IOException If an error occurs.
 522:    *
 523:    * @since 1.2
 524:    */
 525:   public File getCanonicalFile() throws IOException
 526:   {
 527:     return new File(getCanonicalPath());
 528:   }
 529: 
 530:   /**
 531:    * This method returns the name of the file.  This is everything in the
 532:    * complete path of the file after the last instance of the separator
 533:    * string.
 534:    *
 535:    * @return The file name
 536:    */
 537:   public String getName()
 538:   {
 539:       return VMFile.getName(path);
 540:   }
 541: 
 542:   /**
 543:    * This method returns a <code>String</code> the represents this file's
 544:    * parent.  <code>null</code> is returned if the file has no parent.  The
 545:    * parent is determined via a simple operation which removes the
 546:    *
 547:    * @return The parent directory of this file
 548:    */
 549:   public String getParent()
 550:   {
 551:     String prefix = null;
 552:     int nameSeqIndex = 0;
 553:     
 554:     if (path.equals(""))
 555:       return null;
 556: 
 557:     // The "prefix", if present, is the leading "/" on UNIX and 
 558:     // either the drive specifier (e.g. "C:") or the leading "\\"
 559:     // of a UNC network path on Windows.
 560:     if (separatorChar == '/' && path.charAt (0) == '/')
 561:       {
 562:         prefix = "/";
 563:         nameSeqIndex = 1;
 564:       }
 565:     else if (separatorChar == '\\' && path.length() > 1)
 566:       {
 567:         if ((path.charAt (0) == '\\' && path.charAt (1) == '\\')
 568:             || (((path.charAt (0) >= 'a' && path.charAt (0) <= 'z')
 569:                  || (path.charAt (0) >= 'A' && path.charAt (0) <= 'Z'))
 570:                 && path.charAt (1) == ':'))
 571:           {
 572:             prefix = path.substring (0, 2);
 573:             nameSeqIndex = 2;
 574:           }
 575:       }
 576: 
 577:     // According to the JDK docs, the returned parent path is the 
 578:     // portion of the name sequence before the last separator
 579:     // character, if found, prefixed by the prefix, otherwise null.
 580:     if (nameSeqIndex < path.length())
 581:       {
 582:         String nameSeq = path.substring (nameSeqIndex, path.length());
 583:         int last = nameSeq.lastIndexOf (separatorChar);
 584:         if (last == -1)
 585:           return prefix;
 586:         else if (last == (nameSeq.length() - 1))
 587:           // Note: The path would not have a trailing separator
 588:           // except for cases like "C:\" on Windows (see 
 589:           // normalizePath( )), where Sun's JRE 1.4 returns null.
 590:           return null;
 591:         else if (last == 0)
 592:           last++;
 593: 
 594:         if (prefix != null)
 595:           return prefix + nameSeq.substring (0, last);
 596:         else
 597:           return nameSeq.substring (0, last);
 598:       }
 599:     else
 600:       // Sun's JRE 1.4 returns null if the prefix is the only 
 601:       // component of the path - so "/" gives null on UNIX and 
 602:       // "C:", "\\", etc. return null on Windows.
 603:       return null;
 604:   }
 605: 
 606:   /**
 607:    * This method returns a <code>File</code> object representing the parent
 608:    * file of this one.
 609:    *
 610:    * @return a <code>File</code> for the parent of this object.  
 611:    * <code>null</code>
 612:    * will be returned if this object does not have a parent.
 613:    *
 614:    * @since 1.2
 615:    */
 616:   public File getParentFile()
 617:   {
 618:     String parent = getParent();
 619:     return parent != null ? new File(parent) : null;
 620:   }
 621: 
 622:   /**
 623:    * Returns the path name that represents this file.  May be a relative
 624:    * or an absolute path name
 625:    *
 626:    * @return The pathname of this file
 627:    */
 628:   public String getPath()
 629:   {
 630:     return path;
 631:   }
 632: 
 633:   /**
 634:    * This method returns a hash code representing this file.  It is the
 635:    * hash code of the path of this file (as returned by <code>getPath()</code>)
 636:    * exclusived or-ed with the value 1234321.
 637:    *
 638:    * @return The hash code for this object
 639:    */
 640:   public int hashCode()
 641:   {
 642:     if (VMFile.IS_CASE_SENSITIVE)
 643:       return path.hashCode() ^ 1234321;
 644:     else
 645:       return path.toLowerCase().hashCode() ^ 1234321;
 646:   }
 647: 
 648:   /**
 649:    * This method returns true if this object represents an absolute file
 650:    * path and false if it does not.  The definition of an absolute path varies
 651:    * by system.  As an example, on GNU systems, a path is absolute if it starts
 652:    * with a "/".
 653:    *
 654:    * @return <code>true</code> if this object represents an absolute 
 655:    * file name, <code>false</code> otherwise.
 656:    */
 657:   public boolean isAbsolute()
 658:   {
 659:     if (separatorChar == '\\')
 660:     return path.startsWith(dupSeparator) || 
 661:         (path.length() > 2 && 
 662:          ((path.charAt(0) >= 'a' && path.charAt(0) <= 'z') ||
 663:           (path.charAt(0) >= 'A' && path.charAt(0) <= 'Z')) &&
 664:          path.charAt(1) == ':' &&
 665:          path.charAt(2) == '\\');
 666:     else
 667:     return path.startsWith(separator);
 668:   }
 669: 
 670:   /**
 671:    * This method tests whether or not the file represented by this object
 672:    * is a directory.  In order for this method to return <code>true</code>,
 673:    * the file represented by this object must exist and be a directory.
 674:    * 
 675:    * @return <code>true</code> if this file is a directory, <code>false</code>
 676:    * otherwise
 677:    *
 678:    * @exception SecurityException If reading of the file is not permitted
 679:    */
 680:   public boolean isDirectory()
 681:   {
 682:     checkRead();
 683:     return VMFile.isDirectory(path); 
 684:   }
 685: 
 686:   /**
 687:    * This method tests whether or not the file represented by this object
 688:    * is a "plain" file.  A file is a plain file if and only if it 1) Exists,
 689:    * 2) Is not a directory or other type of special file.
 690:    *
 691:    * @return <code>true</code> if this is a plain file, <code>false</code> 
 692:    * otherwise
 693:    *
 694:    * @exception SecurityException If reading of the file is not permitted
 695:    */
 696:   public boolean isFile()
 697:   {
 698:     checkRead();
 699:     return VMFile.isFile(path);
 700:   }
 701: 
 702:   /**
 703:    * This method tests whether or not this file represents a "hidden" file.
 704:    * On GNU systems, a file is hidden if its name begins with a "."
 705:    * character.  Files with these names are traditionally not shown with
 706:    * directory listing tools.
 707:    *
 708:    * @return <code>true</code> if the file is hidden, <code>false</code>
 709:    * otherwise.
 710:    *
 711:    * @since 1.2
 712:    */
 713:   public boolean isHidden()
 714:   {
 715:     return VMFile.isHidden(path);
 716:   }
 717: 
 718:   /**
 719:    * This method returns the last modification time of this file.  The
 720:    * time value returned is an abstract value that should not be interpreted
 721:    * as a specified time value.  It is only useful for comparing to other
 722:    * such time values returned on the same system.  In that case, the larger
 723:    * value indicates a more recent modification time. 
 724:    * <p>
 725:    * If the file does not exist, then a value of 0 is returned.
 726:    *
 727:    * @return The last modification time of the file
 728:    *
 729:    * @exception SecurityException If reading of the file is not permitted
 730:    */
 731:   public long lastModified()
 732:   {
 733:     checkRead();
 734:     return VMFile.lastModified(path);
 735:   }
 736: 
 737:   /**
 738:    * This method returns the length of the file represented by this object,
 739:    * or 0 if the specified file does not exist.
 740:    *
 741:    * @return The length of the file
 742:    *
 743:    * @exception SecurityException If reading of the file is not permitted
 744:    */
 745:   public long length()
 746:   {
 747:     checkRead();
 748:     return VMFile.length(path);
 749:   }
 750: 
 751:   /**
 752:    * This method returns a array of <code>String</code>'s representing the
 753:    * list of files is then directory represented by this object.  If this
 754:    * object represents a non-directory file or a non-existent file, then
 755:    * <code>null</code> is returned.  The list of files will not contain
 756:    * any names such as "." or ".." which indicate the current or parent
 757:    * directory.  Also, the names are not guaranteed to be sorted.
 758:    * <p>
 759:    * In this form of the <code>list()</code> method, a filter is specified
 760:    * that allows the caller to control which files are returned in the
 761:    * list.  The <code>FilenameFilter</code> specified is called for each
 762:    * file returned to determine whether or not that file should be included
 763:    * in the list.
 764:    * <p>
 765:    * A <code>SecurityManager</code> check is made prior to reading the
 766:    * directory.  If read access to the directory is denied, an exception
 767:    * will be thrown.
 768:    *
 769:    * @param filter An object which will identify files to exclude from 
 770:    * the directory listing.
 771:    *
 772:    * @return An array of files in the directory, or <code>null</code> 
 773:    * if this object does not represent a valid directory.
 774:    * 
 775:    * @exception SecurityException If read access is not allowed to the 
 776:    * directory by the <code>SecurityManager</code>
 777:    */
 778:   public String[] list(FilenameFilter filter)
 779:   {
 780:     checkRead();
 781: 
 782:     if (!exists() || !isDirectory())
 783:       return null;
 784:     
 785:     // Get the list of files
 786:     String files[] = VMFile.list(path);
 787:     
 788:     // Check if an error occured in listInternal().
 789:     if (files == null)
 790:       return null;
 791: 
 792:     if (filter == null)
 793:       return files;
 794:     
 795:     // Apply the filter
 796:     int count = 0;
 797:     for (int i = 0; i < files.length; i++)
 798:       {
 799:         if (filter.accept(this, files[i]))
 800:         ++count;
 801:         else
 802:         files[i] = null;
 803:       }
 804: 
 805:     String[] retfiles = new String[count];
 806:     count = 0;
 807:     for (int i = 0; i < files.length; i++)
 808:       if (files[i] != null)
 809:         retfiles[count++] = files[i];
 810: 
 811:     return retfiles;
 812:   }
 813: 
 814:   /**
 815:    * This method returns a array of <code>String</code>'s representing the
 816:    * list of files is then directory represented by this object.  If this
 817:    * object represents a non-directory file or a non-existent file, then
 818:    * <code>null</code> is returned.  The list of files will not contain
 819:    * any names such as "." or ".." which indicate the current or parent
 820:    * directory.  Also, the names are not guaranteed to be sorted.
 821:    * <p>
 822:    * A <code>SecurityManager</code> check is made prior to reading the
 823:    * directory.  If read access to the directory is denied, an exception
 824:    * will be thrown.
 825:    *
 826:    * @return An array of files in the directory, or <code>null</code> if 
 827:    * this object does not represent a valid directory.
 828:    * 
 829:    * @exception SecurityException If read access is not allowed to the 
 830:    * directory by the <code>SecurityManager</code>
 831:    */
 832:   public String[] list()
 833:   {
 834:     return list(null);
 835:   }
 836: 
 837:   /**
 838:    * This method returns an array of <code>File</code> objects representing
 839:    * all the files in the directory represented by this object. If this
 840:    * object does not represent a directory, <code>null</code> is returned.
 841:    * Each of the returned <code>File</code> object is constructed with this
 842:    * object as its parent.
 843:    * <p>
 844:    * A <code>SecurityManager</code> check is made prior to reading the
 845:    * directory.  If read access to the directory is denied, an exception
 846:    * will be thrown.
 847:    *
 848:    * @return An array of <code>File</code> objects for this directory.
 849:    *
 850:    * @exception SecurityException If the <code>SecurityManager</code> denies
 851:    * access to this directory.
 852:    *
 853:    * @since 1.2
 854:    */
 855:   public File[] listFiles()
 856:   {
 857:     return listFiles((FilenameFilter) null);
 858:   }
 859:   
 860:   /**
 861:    * This method returns an array of <code>File</code> objects representing
 862:    * all the files in the directory represented by this object. If this
 863:    * object does not represent a directory, <code>null</code> is returned.
 864:    * Each of the returned <code>File</code> object is constructed with this
 865:    * object as its parent.
 866:    * <p> 
 867:    * In this form of the <code>listFiles()</code> method, a filter is specified
 868:    * that allows the caller to control which files are returned in the
 869:    * list.  The <code>FilenameFilter</code> specified is called for each
 870:    * file returned to determine whether or not that file should be included
 871:    * in the list.
 872:    * <p>
 873:    * A <code>SecurityManager</code> check is made prior to reading the
 874:    * directory.  If read access to the directory is denied, an exception
 875:    * will be thrown.
 876:    *
 877:    * @return An array of <code>File</code> objects for this directory.
 878:    *
 879:    * @exception SecurityException If the <code>SecurityManager</code> denies
 880:    * access to this directory.
 881:    *
 882:    * @since 1.2
 883:    */
 884:   public File[] listFiles(FilenameFilter filter)
 885:   {
 886:     String[] filelist = list(filter);
 887:     
 888:     if (filelist == null)
 889:       return null;
 890: 
 891:     File[] fobjlist = new File [filelist.length];
 892: 
 893:     for (int i = 0; i < filelist.length; i++)
 894:       fobjlist [i] = new File(this, filelist [i]);
 895: 
 896:     return fobjlist;
 897:   }
 898: 
 899:   /**
 900:    * This method returns an array of <code>File</code> objects representing
 901:    * all the files in the directory represented by this object. If this
 902:    * object does not represent a directory, <code>null</code> is returned.
 903:    * Each of the returned <code>File</code> object is constructed with this
 904:    * object as its parent.
 905:    * <p> 
 906:    * In this form of the <code>listFiles()</code> method, a filter is specified
 907:    * that allows the caller to control which files are returned in the
 908:    * list.  The <code>FileFilter</code> specified is called for each
 909:    * file returned to determine whether or not that file should be included
 910:    * in the list.
 911:    * <p>
 912:    * A <code>SecurityManager</code> check is made prior to reading the
 913:    * directory.  If read access to the directory is denied, an exception
 914:    * will be thrown.
 915:    *
 916:    * @return An array of <code>File</code> objects for this directory.
 917:    *
 918:    * @exception SecurityException If the <code>SecurityManager</code> denies
 919:    * access to this directory.
 920:    *
 921:    * @since 1.2
 922:    */
 923:   public File[] listFiles(FileFilter filter)
 924:   {
 925:     File[] fobjlist = listFiles((FilenameFilter) null);
 926: 
 927:     if (fobjlist == null)
 928:       return null;
 929: 
 930:     if (filter == null)
 931:       return fobjlist;
 932: 
 933:     int count = 0;
 934:     for (int i = 0; i < fobjlist.length; i++)
 935:       if (filter.accept(fobjlist[i]) == true)
 936:         ++count;
 937: 
 938:     File[] final_list = new File[count];
 939:     count = 0;
 940:     for (int i = 0; i < fobjlist.length; i++)
 941:       if (filter.accept(fobjlist[i]) == true)
 942:         {
 943:           final_list[count] = fobjlist[i];
 944:           ++count;
 945:         }
 946: 
 947:     return final_list;
 948:   }
 949: 
 950:   /**
 951:    * This method returns a <code>String</code> that is the path name of the
 952:    * file as returned by <code>getPath</code>.
 953:    *
 954:    * @return A <code>String</code> representation of this file
 955:    */
 956:   public String toString()
 957:   {
 958:     return path;
 959:   }
 960: 
 961:   /**
 962:    * @return A <code>URI</code> for this object.
 963:    */
 964:   public URI toURI()
 965:   {
 966:     String abspath = getAbsolutePath();
 967:        
 968:     if (isDirectory() || path.equals(""))
 969:       abspath = abspath + separatorChar;
 970: 
 971:     if (separatorChar == '\\')
 972:       abspath = separatorChar + abspath;
 973:         
 974:     try
 975:       {
 976:         return new URI("file", null, null, -1,
 977:                        abspath.replace(separatorChar, '/'),
 978:                        null, null);
 979:       }
 980:     catch (URISyntaxException use)
 981:       {
 982:         // Can't happen.
 983:         throw (InternalError) new InternalError("Unconvertible file: "
 984:                         + this).initCause(use);
 985:       }
 986:   }
 987: 
 988:   /**
 989:    * This method returns a <code>URL</code> with the <code>file:</code>
 990:    * protocol that represents this file.  The exact form of this URL is
 991:    * system dependent.
 992:    *
 993:    * @return A <code>URL</code> for this object.
 994:    *
 995:    * @exception MalformedURLException If the URL cannot be created 
 996:    * successfully.
 997:    */
 998:   public URL toURL() throws MalformedURLException
 999:   {
1000:     // On Win32, Sun's JDK returns URLs of the form "file:/c:/foo/bar.txt",
1001:     // while on UNIX, it returns URLs of the form "file:/foo/bar.txt". 
1002:     if (separatorChar == '\\')
1003:       return new URL ("file:/" + getAbsolutePath().replace ('\\', '/')
1004:               + (isDirectory() ? "/" : ""));
1005:     else
1006:       return new URL ("file:" + getAbsolutePath()
1007:               + (isDirectory() ? "/" : ""));
1008:   }
1009: 
1010: 
1011:   /**
1012:    * This method creates a directory for the path represented by this object.
1013:    *
1014:    * @return <code>true</code> if the directory was created, 
1015:    * <code>false</code> otherwise
1016:    *
1017:    * @exception SecurityException If write access is not allowed to this file
1018:    */
1019:   public boolean mkdir()
1020:   {
1021:     checkWrite();
1022:     return VMFile.mkdir(path);
1023:   }
1024: 
1025:   /**
1026:    * This method creates a directory for the path represented by this file.
1027:    * It will also create any intervening parent directories if necessary.
1028:    *
1029:    * @return <code>true</code> if the directory was created, 
1030:    * <code>false</code> otherwise
1031:    *
1032:    * @exception SecurityException If write access is not allowed to this file
1033:    */
1034:   public boolean mkdirs()
1035:   {
1036:     String parent = getParent();
1037:     if (parent == null)
1038:       {
1039:         return mkdir();
1040:       }
1041:       
1042:     File f = new File(parent);
1043:     if (!f.exists())
1044:       {
1045:         boolean rc = f.mkdirs();
1046:         if (rc == false)
1047:           return false;
1048:       }
1049: 
1050:     return mkdir();
1051:   }
1052: 
1053:   /**
1054:    * This method creates a temporary file in the specified directory.  If 
1055:    * the directory name is null, then this method uses the system temporary 
1056:    * directory. The files created are guaranteed not to currently exist and 
1057:    * the same file name will never be used twice in the same virtual 
1058:    * machine instance.  
1059:    * The system temporary directory is determined by examinging the 
1060:    * <code>java.io.tmpdir</code> system property.
1061:    * <p>
1062:    * The <code>prefix</code> parameter is a sequence of at least three
1063:    * characters that are used as the start of the generated filename.  The
1064:    * <code>suffix</code> parameter is a sequence of characters that is used
1065:    * to terminate the file name.  This parameter may be <code>null</code>
1066:    * and if it is, the suffix defaults to ".tmp".
1067:    * <p>
1068:    * If a <code>SecurityManager</code> exists, then its <code>checkWrite</code>
1069:    * method is used to verify that this operation is permitted.
1070:    *
1071:    * @param prefix The character prefix to use in generating the path name.
1072:    * @param suffix The character suffix to use in generating the path name.
1073:    * @param directory The directory to create the file in, or 
1074:    * <code>null</code> for the default temporary directory
1075:    *
1076:    * @exception IllegalArgumentException If the patterns is not valid
1077:    * @exception SecurityException If there is no permission to perform 
1078:    * this operation
1079:    * @exception IOException If an error occurs
1080:    *
1081:    * @since 1.2
1082:    */
1083:   public static synchronized File createTempFile(String prefix, String suffix,
1084:                     File directory)
1085:     throws IOException
1086:   {
1087:     // Grab the system temp directory if necessary
1088:     if (directory == null)
1089:       {
1090:         String dirname = System.getProperty("java.io.tmpdir");
1091:         if (dirname == null)
1092:           throw new IOException("Cannot determine system temporary directory"); 
1093:     
1094:         directory = new File(dirname);
1095:         if (! VMFile.exists(directory.path))
1096:           throw new IOException("System temporary directory "
1097:                                 + directory.getName() + " does not exist.");
1098:         if (! VMFile.isDirectory(directory.path))
1099:           throw new IOException("System temporary directory "
1100:                                 + directory.getName()
1101:                                 + " is not really a directory.");
1102:       }
1103: 
1104:     // Check if prefix is at least 3 characters long
1105:     if (prefix.length() < 3)
1106:       throw new IllegalArgumentException("Prefix too short: " + prefix);
1107: 
1108:     // Set default value of suffix
1109:     if (suffix == null)
1110:       suffix = ".tmp";
1111: 
1112:     // Now identify a file name and make sure it doesn't exist.
1113:     File file;
1114:     if (!VMFile.IS_DOS_8_3)
1115:       { 
1116:         do
1117:           {
1118:             long now = System.currentTimeMillis();
1119:             if (now > last_tmp)
1120:               {
1121:                 // The last temporary file was created more than 1 ms ago.
1122:                 last_tmp = now;
1123:                 n_created = 0;
1124:               }
1125:             else
1126:               n_created++;
1127:             
1128:             String name = Long.toHexString(now);
1129:             if (n_created > 0)
1130:               name += '_'+Integer.toHexString(n_created);
1131:             String filename = prefix + name + suffix;
1132:             file = new File(directory, filename);
1133:           }
1134:         while (VMFile.exists(file.path));
1135:       }
1136:     else
1137:       {
1138:         // make sure prefix is not longer than 7 characters
1139:         if (prefix.length() >= 8)
1140:           throw new IllegalArgumentException("Prefix too long: " + prefix + "(valid length 3..7)");
1141: 
1142:         long mask = 0x000000ffffFFFFL >> (prefix.length() * 4);
1143:         do
1144:           {
1145:             int n = (int) (System.currentTimeMillis() & mask);
1146:             String filename = prefix + java.lang.Integer.toHexString(n) + suffix;
1147:             file = new File(directory, filename);
1148:           }
1149:         while (VMFile.exists(file.path));
1150:       }
1151: 
1152:     // Verify that we are allowed to create this file
1153:     SecurityManager sm = System.getSecurityManager();
1154:     if (sm != null)
1155:       sm.checkWrite(file.getAbsolutePath());
1156: 
1157:     // Now create the file and return our file object
1158:     // XXX - FIXME race condition.
1159:     VMFile.create(file.getAbsolutePath()); 
1160:     return file;
1161:   }
1162: 
1163:   /**
1164:    * This method sets the file represented by this object to be read only.
1165:    * A read only file or directory cannot be modified.  Please note that 
1166:    * GNU systems allow read only files to be deleted if the directory it
1167:    * is contained in is writable.
1168:    *
1169:    * @return <code>true</code> if the operation succeeded, <code>false</code>
1170:    * otherwise.
1171:    *
1172:    * @exception SecurityException If the <code>SecurityManager</code> does
1173:    * not allow this operation.
1174:    *
1175:    * @since 1.2
1176:    */
1177:   public boolean setReadOnly()
1178:   {
1179:     // Do a security check before trying to do anything else.
1180:     checkWrite();
1181: 
1182:     // Test for existence.
1183:     if (! VMFile.exists(path))
1184:       return false;
1185: 
1186:     return VMFile.setReadOnly(path);
1187:   }
1188: 
1189:   /**
1190:    * This method returns an array of filesystem roots.  Some operating systems
1191:    * have volume oriented filesystem.  This method provides a mechanism for
1192:    * determining which volumes exist.  GNU systems use a single hierarchical
1193:    * filesystem, so will have only one "/" filesystem root.
1194:    *
1195:    * @return An array of <code>File</code> objects for each filesystem root
1196:    * available.
1197:    *
1198:    * @since 1.2
1199:    */
1200:   public static File[] listRoots()
1201:   {
1202:     return VMFile.listRoots();
1203:   }
1204: 
1205:   /**
1206:    * This method creates a temporary file in the system temporary directory. 
1207:    * The files created are guaranteed not to currently exist and the same file
1208:    * name will never be used twice in the same virtual machine instance.  The
1209:    * system temporary directory is determined by examinging the 
1210:    * <code>java.io.tmpdir</code> system property.
1211:    * <p>
1212:    * The <code>prefix</code> parameter is a sequence of at least three
1213:    * characters that are used as the start of the generated filename.  The
1214:    * <code>suffix</code> parameter is a sequence of characters that is used
1215:    * to terminate the file name.  This parameter may be <code>null</code>
1216:    * and if it is, the suffix defaults to ".tmp".
1217:    * <p>
1218:    * If a <code>SecurityManager</code> exists, then its <code>checkWrite</code>
1219:    * method is used to verify that this operation is permitted.
1220:    * <p>
1221:    * This method is identical to calling 
1222:    * <code>createTempFile(prefix, suffix, null)</code>.
1223:    *
1224:    * @param prefix The character prefix to use in generating the path name.
1225:    * @param suffix The character suffix to use in generating the path name.
1226:    *
1227:    * @exception IllegalArgumentException If the prefix or suffix are not valid.
1228:    * @exception SecurityException If there is no permission to perform 
1229:    * this operation
1230:    * @exception IOException If an error occurs
1231:    */
1232:   public static File createTempFile(String prefix, String suffix)
1233:     throws IOException
1234:   {
1235:     return createTempFile(prefix, suffix, null);
1236:   }
1237: 
1238:   /**
1239:    * This method compares the specified <code>File</code> to this one
1240:    * to test for equality.  It does this by comparing the canonical path names
1241:    * of the files. 
1242:    * <p>
1243:    * The canonical paths of the files are determined by calling the
1244:    * <code>getCanonicalPath</code> method on each object.
1245:    * <p>
1246:    * This method returns a 0 if the specified <code>Object</code> is equal
1247:    * to this one, a negative value if it is less than this one 
1248:    * a positive value if it is greater than this one.
1249:    *
1250:    * @return An integer as described above
1251:    *
1252:    * @since 1.2
1253:    */
1254:   public int compareTo(File other)
1255:   {
1256:     if (VMFile.IS_CASE_SENSITIVE)
1257:       return path.compareTo (other.path);
1258:     else
1259:       return path.compareToIgnoreCase (other.path);
1260:   }
1261: 
1262:   /**
1263:    * This method compares the specified <code>Object</code> to this one
1264:    * to test for equality.  It does this by comparing the canonical path names
1265:    * of the files.  This method is identical to <code>compareTo(File)</code>
1266:    * except that if the <code>Object</code> passed to it is not a 
1267:    * <code>File</code>, it throws a <code>ClassCastException</code>
1268:    * <p>
1269:    * The canonical paths of the files are determined by calling the
1270:    * <code>getCanonicalPath</code> method on each object.
1271:    * <p>
1272:    * This method returns a 0 if the specified <code>Object</code> is equal
1273:    * to this one, a negative value if it is less than this one 
1274:    * a positive value if it is greater than this one.
1275:    *
1276:    * @return An integer as described above
1277:    *
1278:    * @exception ClassCastException If the passed <code>Object</code> is 
1279:    * not a <code>File</code>
1280:    *
1281:    * @since 1.2
1282:    */
1283:   public int compareTo(Object obj)
1284:   {
1285:     return compareTo((File) obj);
1286:   }
1287: 
1288:   /**
1289:    * This method renames the file represented by this object to the path
1290:    * of the file represented by the argument <code>File</code>.
1291:    *
1292:    * @param dest The <code>File</code> object representing the target name
1293:    *
1294:    * @return <code>true</code> if the rename succeeds, <code>false</code> 
1295:    * otherwise.
1296:    *
1297:    * @exception SecurityException If write access is not allowed to the 
1298:    * file by the <code>SecurityMananger</code>.
1299:    */
1300:   public synchronized boolean renameTo(File dest)
1301:   {
1302:     checkWrite();
1303:     dest.checkWrite();
1304:     // Call our native rename method
1305:     return VMFile.renameTo(path, dest.path);
1306:   }
1307: 
1308:   /**
1309:    * This method sets the modification time on the file to the specified
1310:    * value.  This is specified as the number of seconds since midnight
1311:    * on January 1, 1970 GMT.
1312:    *
1313:    * @param time The desired modification time.
1314:    *
1315:    * @return <code>true</code> if the operation succeeded, <code>false</code>
1316:    * otherwise.
1317:    *
1318:    * @exception IllegalArgumentException If the specified time is negative.
1319:    * @exception SecurityException If the <code>SecurityManager</code> will
1320:    * not allow this operation.
1321:    *
1322:    * @since 1.2
1323:    */
1324:   public boolean setLastModified(long time) 
1325:   {
1326:     if (time < 0)
1327:       throw new IllegalArgumentException("Negative modification time: " + time);
1328: 
1329:     checkWrite();
1330:     return VMFile.setLastModified(path, time);
1331:   }
1332: 
1333:   private void checkWrite()
1334:   {
1335:     // Check the SecurityManager
1336:     SecurityManager s = System.getSecurityManager();
1337:     
1338:     if (s != null)
1339:       s.checkWrite(path);
1340:   }
1341: 
1342:   private void checkRead()
1343:   {
1344:     // Check the SecurityManager
1345:     SecurityManager s = System.getSecurityManager();
1346:     
1347:     if (s != null)
1348:       s.checkRead(path);
1349:   }
1350: 
1351:   /** 
1352:    * Calling this method requests that the file represented by this object
1353:    * be deleted when the virtual machine exits.  Note that this request cannot
1354:    * be cancelled.  Also, it will only be carried out if the virtual machine
1355:    * exits normally.
1356:    *
1357:    * @exception SecurityException If deleting of the file is not allowed
1358:    *
1359:    * @since 1.2 
1360:    */
1361:   public void deleteOnExit()
1362:   {
1363:     // Check the SecurityManager
1364:     SecurityManager sm = System.getSecurityManager();
1365:     if (sm != null)
1366:       sm.checkDelete(path);
1367: 
1368:     DeleteFileHelper.add(this);
1369:   }
1370: 
1371:   private void writeObject(ObjectOutputStream oos) throws IOException
1372:   {
1373:     oos.defaultWriteObject();
1374:     oos.writeChar(separatorChar);
1375:   }
1376: 
1377:   private void readObject(ObjectInputStream ois)
1378:     throws ClassNotFoundException, IOException
1379:   {
1380:     ois.defaultReadObject();
1381: 
1382:     // If the file was from an OS with a different dir separator,
1383:     // fixup the path to use the separator on this OS.
1384:     char oldSeparatorChar = ois.readChar();
1385:     
1386:     if (oldSeparatorChar != separatorChar)
1387:       path = path.replace(oldSeparatorChar, separatorChar);
1388:   }
1389:   
1390: } // class File