Source for java.io.File

   1: /* File.java -- Class representing a file on disk
   2:    Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006
   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 java.net.MalformedURLException;
  43: import java.net.URI;
  44: import java.net.URISyntaxException;
  45: import java.net.URL;
  46: import gnu.classpath.Configuration;
  47: 
  48: /* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
  49:  * "The Java Language Specification", ISBN 0-201-63451-1
  50:  * Status:  Complete to version 1.3.
  51:  */
  52: 
  53: /**
  54:  * This class represents a file or directory on a local disk.  It provides
  55:  * facilities for dealing with a variety of systems that use various
  56:  * types of path separators ("/" versus "\", for example).  It also
  57:  * contains method useful for creating and deleting files and directories.
  58:  *
  59:  * @author Aaron M. Renn (arenn@urbanophile.com)
  60:  * @author Tom Tromey (tromey@cygnus.com)
  61:  */
  62: public class File implements Serializable, Comparable
  63: {
  64:   private static final long serialVersionUID = 301077366599181567L;
  65:     
  66:   // QUERY arguments to access function.
  67:   private final static int READ = 0;
  68:   private final static int WRITE = 1;
  69:   private final static int EXISTS = 2;
  70: 
  71:   // QUERY arguments to stat function.
  72:   private final static int DIRECTORY = 0;
  73:   private final static int ISFILE = 1;
  74:   private final static int ISHIDDEN = 2;
  75: 
  76:   // QUERY arguments to attr function.
  77:   private final static int MODIFIED = 0;
  78:   private final static int LENGTH = 1;
  79:   
  80:   private final native long attr (int query);
  81:   // On OSF1 V5.0, `stat' is a macro.  It is easiest to use the name
  82:   // `_stat' instead.  We do the same thing for `_access' just in
  83:   // case.
  84:   private final native boolean _access (int query);
  85:   private final native boolean _stat (int query);
  86: 
  87:   /**
  88:    * This is the path separator string for the current host. This field
  89:    * contains the value of the <code>file.separator</code> system property.
  90:    * An example separator string would be "/" on the GNU system.
  91:    */
  92:   public static final String separator = System.getProperty("file.separator");
  93:   private static final String dupSeparator = separator + separator;
  94: 
  95:   /**
  96:    * This is the first character of the file separator string.  On many
  97:    * hosts (for example, on the GNU system), this represents the entire 
  98:    * separator string.  The complete separator string is obtained from the
  99:    * <code>file.separator</code>system property.
 100:    */
 101:   public static final char separatorChar = separator.charAt(0);
 102:   
 103:   /**
 104:    * This is the string that is used to separate the host name from the
 105:    * path name in paths than include the host name.  It is the value of
 106:    * the <code>path.separator</code> system property.
 107:    */
 108:   public static final String pathSeparator
 109:     = System.getProperty("path.separator");
 110:   
 111:   /**
 112:    * This is the first character of the string used to separate the host name
 113:    * from the path name in paths that include a host.  The separator string
 114:    * is taken from the <code>path.separator</code> system property.
 115:    */
 116:   public static final char pathSeparatorChar = pathSeparator.charAt(0);
 117: 
 118:   static final String tmpdir = System.getProperty("java.io.tmpdir");
 119:   static int maxPathLen;
 120:   static boolean caseSensitive;
 121:   
 122:   static
 123:   {
 124:     if (Configuration.INIT_LOAD_LIBRARY)
 125:       {
 126:         System.loadLibrary("javaio");
 127:       }
 128:     
 129:     init_native();
 130:   }
 131:   
 132:   // Native function called at class initialization. This should should
 133:   // set the maxPathLen and caseSensitive variables.
 134:   private static native void init_native();
 135: 
 136:   /**
 137:    * This is the path to the file set when the object is created.  It
 138:    * may be an absolute or relative path name.
 139:    */
 140:   private String path;
 141: 
 142:   // We keep a counter for use by createTempFile.  We choose the first
 143:   // value randomly to try to avoid clashes with other VMs.
 144:   private static long counter = Double.doubleToLongBits (Math.random());
 145: 
 146:   /**
 147:    * This method tests whether or not the current thread is allowed to
 148:    * to read the file pointed to by this object.  This will be true if and
 149:    * and only if 1) the file exists and 2) the <code>SecurityManager</code>
 150:    * (if any) allows access to the file via it's <code>checkRead</code>
 151:    * method 3) the file is readable.
 152:    *
 153:    * @return <code>true</code> if reading is allowed, 
 154:    * <code>false</code> otherwise
 155:    *
 156:    * @exception SecurityException If the <code>SecurityManager</code> 
 157:    * does not allow access to the file
 158:    */
 159:   public boolean canRead()
 160:   {
 161:     checkRead();
 162:     return _access (READ);
 163:   }
 164: 
 165:   /**
 166:    * This method test whether or not the current thread is allowed to
 167:    * write to this object.  This will be true if and only if 1) The
 168:    * <code>SecurityManager</code> (if any) allows write access to the
 169:    * file and 2) The file exists and 3) The file is writable.  To determine
 170:    * whether or not a non-existent file can be created, check the parent
 171:    * directory for write access.
 172:    *
 173:    * @return <code>true</code> if writing is allowed, <code>false</code> 
 174:    * otherwise
 175:    *
 176:    * @exception SecurityException If the <code>SecurityManager</code> 
 177:    * does not allow access to the file
 178:    */
 179:   public boolean canWrite()
 180:   {
 181:     checkWrite();
 182:     return _access (WRITE);
 183:   }
 184:   
 185:   private native boolean performCreate() throws IOException;
 186: 
 187:   /**
 188:    * This method creates a new file of zero length with the same name as
 189:    * the path of this <code>File</code> object if an only if that file
 190:    * does not already exist.
 191:    * <p>
 192:    * A <code>SecurityManager.checkWrite</code> check is done prior
 193:    * to performing this action.
 194:    *
 195:    * @return <code>true</code> if the file was created, <code>false</code> if
 196:    * the file alread existed.
 197:    *
 198:    * @exception IOException If an I/O error occurs
 199:    * @exception SecurityException If the <code>SecurityManager</code> will
 200:    * not allow this operation to be performed.
 201:    *
 202:    * @since 1.2
 203:    */
 204:   public boolean createNewFile() throws IOException
 205:   {
 206:     checkWrite();
 207:     return performCreate();
 208:   }
 209:  
 210:   /*
 211:    * This native method handles the actual deleting of the file
 212:    */
 213:   private native boolean performDelete();
 214: 
 215:   /**
 216:    * This method deletes the file represented by this object.  If this file
 217:    * is a directory, it must be empty in order for the delete to succeed.
 218:    *
 219:    * @return <code>true</code> if the file was deleted, <code>false</code> 
 220:    * otherwise
 221:    *
 222:    * @exception SecurityException If deleting of the file is not allowed
 223:    */
 224:   public synchronized boolean delete()
 225:   {
 226:     SecurityManager s = System.getSecurityManager();
 227:     
 228:     if (s != null)
 229:       s.checkDelete(path);
 230:     
 231:     return performDelete();
 232:   }
 233: 
 234:   /**
 235:    * This method tests two <code>File</code> objects for equality by 
 236:    * comparing the path of the specified <code>File</code> against the path
 237:    * of this object.  The two objects are equal if an only if 1) The
 238:    * argument is not null 2) The argument is a <code>File</code> object and
 239:    * 3) The path of the <code>File</code>argument is equal to the path
 240:    * of this object.
 241:    * <p>
 242:    * The paths of the files are determined by calling the 
 243:    * <code>getPath()</code>
 244:    * method on each object.
 245:    *
 246:    * @return <code>true</code> if the two objects are equal, 
 247:    * <code>false</code> otherwise.
 248:    */
 249:   public boolean equals(Object obj)
 250:   {
 251:     if (! (obj instanceof File))
 252:       return false;
 253:     
 254:     File other = (File) obj;
 255: 
 256:     if (caseSensitive)
 257:       return path.equals(other.path);
 258:     else
 259:       return path.equalsIgnoreCase(other.path);
 260:   }
 261: 
 262:   /**
 263:    * This method tests whether or not the file represented by the object
 264:    * actually exists on the filesystem.
 265:    *
 266:    * @return <code>true</code> if the file exists, <code>false</code>otherwise.
 267:    *
 268:    * @exception SecurityException If reading of the file is not permitted
 269:    */
 270:   public boolean exists()
 271:   {
 272:     checkRead();
 273:     return _access (EXISTS);
 274:   }
 275: 
 276:   /**
 277:    * This method initializes a new <code>File</code> object to represent
 278:    * a file with the specified path.
 279:    *
 280:    * @param name The path name of the file
 281:    */
 282:   public File(String name)
 283:   {
 284:     path = normalizePath (name);
 285:   }
 286: 
 287:   // Remove duplicate and redundant separator characters.
 288:   private String normalizePath(String p)
 289:   {
 290:     // On Windows, convert any '/' to '\'.  This appears to be the same logic
 291:     // that Sun's Win32 Java performs.
 292:     if (separatorChar == '\\')
 293:       {
 294:         p = p.replace ('/', '\\');
 295:     // We have to special case the "\c:" prefix.
 296:     if (p.length() > 2 && p.charAt(0) == '\\' &&
 297:         ((p.charAt(1) >= 'a' && p.charAt(1) <= 'z') ||
 298:         (p.charAt(1) >= 'A' && p.charAt(1) <= 'Z')) &&
 299:         p.charAt(2) == ':')
 300:       p = p.substring(1);
 301:       }
 302: 
 303:     int dupIndex = p.indexOf(dupSeparator);
 304:     int plen = p.length();
 305: 
 306:     // Special case: permit Windows UNC path prefix.
 307:     if (dupSeparator.equals("\\\\") && dupIndex == 0)
 308:       dupIndex = p.indexOf(dupSeparator, 1);
 309: 
 310:     if (dupIndex == -1)
 311:       {
 312:         // Ignore trailing separator (though on Windows "a:\", for
 313:         // example, is a valid and minimal path).
 314:         if (plen > 1 && p.charAt (plen - 1) == separatorChar)
 315:       {
 316:         if (! (separatorChar == '\\' && plen == 3 && p.charAt (1) == ':'))
 317:           return p.substring (0, plen - 1);
 318:       }
 319:     else
 320:       return p;
 321:       }
 322:     
 323:     StringBuffer newpath = new StringBuffer(plen);
 324:     int last = 0;
 325:     while (dupIndex != -1)
 326:       {
 327:         newpath.append(p.substring(last, dupIndex));
 328:     // Ignore the duplicate path characters.
 329:     while (p.charAt(dupIndex) == separatorChar)
 330:       {
 331:         dupIndex++;
 332:         if (dupIndex == plen)
 333:           return newpath.toString();
 334:       }
 335:     newpath.append(separatorChar);
 336:     last = dupIndex;
 337:     dupIndex = p.indexOf(dupSeparator, last);
 338:       }
 339:     
 340:     // Again, ignore possible trailing separator (except special cases
 341:     // like "a:\" on Windows).
 342:     int end;
 343:     if (plen > 1 && p.charAt (plen - 1) == separatorChar)
 344:     {
 345:       if (separatorChar == '\\' && plen == 3 && p.charAt (1) == ':')
 346:         end = plen;
 347:       else
 348:         end = plen - 1;
 349:     }
 350:     else
 351:       end = plen;
 352:     newpath.append(p.substring(last, end));
 353:     
 354:     return newpath.toString();
 355:   }
 356:  
 357:   /**
 358:    * This method initializes a new <code>File</code> object to represent
 359:    * a file in the specified named directory.  The path name to the file
 360:    * will be the directory name plus the separator string plus the file
 361:    * name.  If the directory path name ends in the separator string, another
 362:    * separator string will still be appended.
 363:    *
 364:    * @param dirPath The path to the directory the file resides in
 365:    * @param name The name of the file
 366:    */
 367:   public File(String dirPath, String name)
 368:   {
 369:     if (name == null)
 370:       throw new NullPointerException();
 371:     if (dirPath != null)
 372:       {
 373:     if (dirPath.length() > 0)
 374:       {
 375:         // Try to be smart about the number of separator characters.
 376:         if (dirPath.charAt(dirPath.length() - 1) == separatorChar
 377:         || name.length() == 0)
 378:           path = normalizePath(dirPath + name);
 379:         else
 380:           path = normalizePath(dirPath + separatorChar + name);
 381:       }
 382:     else
 383:       {
 384:         // If dirPath is empty, use a system dependant
 385:         // default prefix.
 386:         // Note that the leading separators in name have
 387:         // to be chopped off, to prevent them forming
 388:         // a UNC prefix on Windows.
 389:         if (separatorChar == '\\' /* TODO use ON_WINDOWS */)
 390:           {
 391:         int skip = 0;
 392:         while(name.length() > skip
 393:             && (name.charAt(skip) == separatorChar
 394:             || name.charAt(skip) == '/'))
 395:           {
 396:             skip++;
 397:           }
 398:         name = name.substring(skip);
 399:           }
 400:         path = normalizePath(separatorChar + name);
 401:       }
 402:       }
 403:     else
 404:       path = normalizePath(name);
 405:   }
 406: 
 407:   /**
 408:    * This method initializes a new <code>File</code> object to represent
 409:    * a file in the specified directory.  If the <code>directory</code>
 410:    * argument is <code>null</code>, the file is assumed to be in the
 411:    * current directory as specified by the <code>user.dir</code> system
 412:    * property
 413:    *
 414:    * @param directory The directory this file resides in
 415:    * @param name The name of the file
 416:    */
 417:   public File(File directory, String name)
 418:   {
 419:     this (directory == null ? null : directory.path, name);
 420:   }
 421: 
 422:   /**
 423:    * This method initializes a new <code>File</code> object to represent
 424:    * a file corresponding to the specified <code>file:</code> protocol URI.
 425:    *
 426:    * @param uri The uri.
 427:    */
 428:   public File(URI uri)
 429:   {
 430:     if (uri == null)
 431:     throw new NullPointerException("uri is null");
 432: 
 433:     if (!uri.getScheme().equals("file"))
 434:     throw new IllegalArgumentException("invalid uri protocol");
 435: 
 436:     String name = uri.getPath();
 437:     if (name == null)
 438:       throw new IllegalArgumentException("URI \"" + uri
 439:                      + "\" is not hierarchical");
 440:     path = normalizePath(name);
 441:   }
 442: 
 443:   /**
 444:    * This method returns the path of this file as an absolute path name.
 445:    * If the path name is already absolute, then it is returned.  Otherwise
 446:    * the value returned is the current directory plus the separatory
 447:    * string plus the path of the file.  The current directory is determined
 448:    * from the <code>user.dir</code> system property.
 449:    *
 450:    * @return The absolute path of this file
 451:    */
 452:   public String getAbsolutePath()
 453:   {
 454:     if (isAbsolute())
 455:       return path;
 456:     else if (separatorChar == '\\' 
 457:              && path.length() > 0 && path.charAt (0) == '\\')
 458:       {
 459:         // On Windows, even if the path starts with a '\\' it is not
 460:         // really absolute until we prefix the drive specifier from
 461:         // the current working directory to it.
 462:         return System.getProperty ("user.dir").substring (0, 2) + path;
 463:       }
 464:     else if (separatorChar == '\\' 
 465:              && path.length() > 1 && path.charAt (1) == ':'
 466:              && ((path.charAt (0) >= 'a' && path.charAt (0) <= 'z')
 467:                  || (path.charAt (0) >= 'A' && path.charAt (0) <= 'Z')))
 468:       {
 469:         // On Windows, a process has a current working directory for
 470:         // each drive and a path like "G:foo\bar" would mean the 
 471:         // absolute path "G:\wombat\foo\bar" if "\wombat" is the 
 472:         // working directory on the G drive.
 473:         String drvDir = null;
 474:         try
 475:           {
 476:             drvDir = new File (path.substring (0, 2)).getCanonicalPath();
 477:           }
 478:         catch (IOException e)
 479:           {
 480:             drvDir = path.substring (0, 2) + "\\";
 481:           }
 482:         
 483:         // Note: this would return "C:\\." for the path "C:.", if "\"
 484:         // is the working folder on the C drive, but this is 
 485:         // consistent with what Sun's JRE 1.4.1.01 actually returns!
 486:         if (path.length() > 2)
 487:           return drvDir + '\\' + path.substring (2, path.length());
 488:         else
 489:           return drvDir;
 490:       }
 491:     else
 492:       return System.getProperty ("user.dir") + separatorChar + path;
 493:   }
 494: 
 495:   /**
 496:    * This method returns a <code>File</code> object representing the
 497:    * absolute path of this object.
 498:    *
 499:    * @return A <code>File</code> with the absolute path of the object.
 500:    *
 501:    * @since 1.2
 502:    */
 503:   public File getAbsoluteFile()
 504:   {
 505:     return new File(getAbsolutePath());
 506:   }
 507: 
 508:   /**
 509:    * This method returns a canonical representation of the pathname of
 510:    * this file.  The actual form of the canonical representation is
 511:    * different.  On the GNU system, the canonical form differs from the
 512:    * absolute form in that all relative file references to "." and ".."
 513:    * are resolved and removed.
 514:    * <p>
 515:    * Note that this method, unlike the other methods which return path
 516:    * names, can throw an IOException.  This is because native method 
 517:    * might be required in order to resolve the canonical path
 518:    *
 519:    * @exception IOException If an error occurs
 520:    */
 521:   public native String getCanonicalPath() throws IOException;
 522: 
 523:   /**
 524:    * This method returns a <code>File</code> object representing the
 525:    * canonical path of this object.
 526:    *
 527:    * @return A <code>File</code> instance representing the canonical path of
 528:    * this object.
 529:    *
 530:    * @exception IOException If an error occurs.
 531:    *
 532:    * @since 1.2
 533:    */
 534:   public File getCanonicalFile() throws IOException
 535:   {
 536:     return new File(getCanonicalPath());
 537:   }
 538: 
 539:   /**
 540:    * This method returns the name of the file.  This is everything in the
 541:    * complete path of the file after the last instance of the separator
 542:    * string.
 543:    *
 544:    * @return The file name
 545:    */
 546:   public String getName()
 547:   {
 548:     int nameSeqIndex = 0;
 549: 
 550:     if (separatorChar == '\\' && path.length() > 1)
 551:       {
 552:         // On Windows, ignore the drive specifier or the leading '\\'
 553:         // of a UNC network path, if any (a.k.a. the "prefix").
 554:         if ((path.charAt (0) == '\\' && path.charAt (1) == '\\')
 555:             || (((path.charAt (0) >= 'a' && path.charAt (0) <= 'z')
 556:          || (path.charAt (0) >= 'A' && path.charAt (0) <= 'Z'))
 557:         && path.charAt (1) == ':'))
 558:       {
 559:         if (path.length() > 2)
 560:           nameSeqIndex = 2;
 561:         else
 562:           return "";
 563:       }
 564:       }
 565: 
 566:     String nameSeq 
 567:       = (nameSeqIndex > 0 ? path.substring (nameSeqIndex) : path);
 568: 
 569:     int last = nameSeq.lastIndexOf (separatorChar);
 570: 
 571:     return nameSeq.substring (last + 1);
 572:   }
 573: 
 574:   /**
 575:    * This method returns a <code>String</code> the represents this file's
 576:    * parent.  <code>null</code> is returned if the file has no parent.  The
 577:    * parent is determined via a simple operation which removes the
 578:    *
 579:    * @return The parent directory of this file
 580:    */
 581:   public String getParent()
 582:   {
 583:     String prefix = null;
 584:     int nameSeqIndex = 0;
 585: 
 586:     // The "prefix", if present, is the leading "/" on UNIX and 
 587:     // either the drive specifier (e.g. "C:") or the leading "\\"
 588:     // of a UNC network path on Windows.
 589:     if (separatorChar == '/' && path.charAt (0) == '/')
 590:       {
 591:         prefix = "/";
 592:         nameSeqIndex = 1;
 593:       }
 594:     else if (separatorChar == '\\' && path.length() > 1)
 595:       {
 596:         if ((path.charAt (0) == '\\' && path.charAt (1) == '\\')
 597:             || (((path.charAt (0) >= 'a' && path.charAt (0) <= 'z')
 598:                  || (path.charAt (0) >= 'A' && path.charAt (0) <= 'Z'))
 599:                 && path.charAt (1) == ':'))
 600:           {
 601:             prefix = path.substring (0, 2);
 602:             nameSeqIndex = 2;
 603:           }
 604:       }
 605: 
 606:     // According to the JDK docs, the returned parent path is the 
 607:     // portion of the name sequence before the last separator
 608:     // character, if found, prefixed by the prefix, otherwise null.
 609:     if (nameSeqIndex < path.length())
 610:       {
 611:         String nameSeq = path.substring (nameSeqIndex, path.length());
 612:         int last = nameSeq.lastIndexOf (separatorChar);
 613:         if (last == -1)
 614:           return prefix;
 615:         else if (last == (nameSeq.length() - 1))
 616:           // Note: The path would not have a trailing separator
 617:           // except for cases like "C:\" on Windows (see 
 618:           // normalizePath( )), where Sun's JRE 1.4 returns null.
 619:           return null;
 620:         else if (last == 0)
 621:           last++;
 622: 
 623:         if (prefix != null)
 624:           return prefix + nameSeq.substring (0, last);
 625:         else
 626:           return nameSeq.substring (0, last);
 627:       }
 628:     else
 629:       // Sun's JRE 1.4 returns null if the prefix is the only 
 630:       // component of the path - so "/" gives null on UNIX and 
 631:       // "C:", "\\", etc. return null on Windows.
 632:       return null;
 633:   }
 634: 
 635:   /**
 636:    * This method returns a <code>File</code> object representing the parent
 637:    * file of this one.
 638:    *
 639:    * @return a <code>File</code> for the parent of this object.  
 640:    * <code>null</code>
 641:    * will be returned if this object does not have a parent.
 642:    *
 643:    * @since 1.2
 644:    */
 645:   public File getParentFile()
 646:   {
 647:     String parent = getParent();
 648:     return parent != null ? new File(parent) : null;
 649:   }
 650: 
 651:   /**
 652:    * Returns the path name that represents this file.  May be a relative
 653:    * or an absolute path name
 654:    *
 655:    * @return The pathname of this file
 656:    */
 657:   public String getPath()
 658:   {
 659:     return path;
 660:   }
 661: 
 662:   /**
 663:    * This method returns a hash code representing this file.  It is the
 664:    * hash code of the path of this file (as returned by <code>getPath()</code>)
 665:    * exclusived or-ed with the value 1234321.
 666:    *
 667:    * @return The hash code for this object
 668:    */
 669:   public int hashCode()
 670:   {
 671:     if (caseSensitive)
 672:       return path.hashCode() ^ 1234321;
 673:     else
 674:       return path.toLowerCase().hashCode() ^ 1234321;
 675:   }
 676: 
 677:   /**
 678:    * This method returns true if this object represents an absolute file
 679:    * path and false if it does not.  The definition of an absolute path varies
 680:    * by system.  As an example, on GNU systems, a path is absolute if it starts
 681:    * with a "/".
 682:    *
 683:    * @return <code>true</code> if this object represents an absolute 
 684:    * file name, <code>false</code> otherwise.
 685:    */
 686:   public native boolean isAbsolute();
 687: 
 688:   /**
 689:    * This method tests whether or not the file represented by this object
 690:    * is a directory.  In order for this method to return <code>true</code>,
 691:    * the file represented by this object must exist and be a directory.
 692:    * 
 693:    * @return <code>true</code> if this file is a directory, <code>false</code>
 694:    * otherwise
 695:    *
 696:    * @exception SecurityException If reading of the file is not permitted
 697:    */
 698:   public boolean isDirectory()
 699:   {
 700:     checkRead();
 701:     return _stat (DIRECTORY);
 702:   }
 703: 
 704:   /**
 705:    * This method tests whether or not the file represented by this object
 706:    * is a "plain" file.  A file is a plain file if and only if it 1) Exists,
 707:    * 2) Is not a directory or other type of special file.
 708:    *
 709:    * @return <code>true</code> if this is a plain file, <code>false</code> 
 710:    * otherwise
 711:    *
 712:    * @exception SecurityException If reading of the file is not permitted
 713:    */
 714:   public boolean isFile()
 715:   {
 716:     checkRead();
 717:     return _stat (ISFILE);
 718:   }
 719: 
 720:   /**
 721:    * This method tests whether or not this file represents a "hidden" file.
 722:    * On GNU systems, a file is hidden if its name begins with a "."
 723:    * character.  Files with these names are traditionally not shown with
 724:    * directory listing tools.
 725:    *
 726:    * @return <code>true</code> if the file is hidden, <code>false</code>
 727:    * otherwise.
 728:    *
 729:    * @since 1.2
 730:    */
 731:   public boolean isHidden()
 732:   {
 733:     checkRead();
 734:     return _stat (ISHIDDEN);
 735:   }
 736: 
 737:   /**
 738:    * This method returns the last modification time of this file.  The
 739:    * time value returned is an abstract value that should not be interpreted
 740:    * as a specified time value.  It is only useful for comparing to other
 741:    * such time values returned on the same system.  In that case, the larger
 742:    * value indicates a more recent modification time. 
 743:    * <p>
 744:    * If the file does not exist, then a value of 0 is returned.
 745:    *
 746:    * @return The last modification time of the file
 747:    *
 748:    * @exception SecurityException If reading of the file is not permitted
 749:    */
 750:   public long lastModified()
 751:   {
 752:     checkRead();
 753:     return attr (MODIFIED);
 754:   }
 755: 
 756:   /**
 757:    * This method returns the length of the file represented by this object,
 758:    * or 0 if the specified file does not exist.
 759:    *
 760:    * @return The length of the file
 761:    *
 762:    * @exception SecurityException If reading of the file is not permitted
 763:    */
 764:   public long length()
 765:   {
 766:     checkRead();
 767:     return attr (LENGTH);
 768:   }
 769: 
 770:   /*
 771:    * This native function actually produces the list of file in this
 772:    * directory
 773:    */
 774:   private final native Object[] performList (FilenameFilter filter,
 775:                          FileFilter fileFilter,
 776:                          Class result_type);
 777: 
 778:   /**
 779:    * This method returns a array of <code>String</code>'s representing the
 780:    * list of files is then directory represented by this object.  If this
 781:    * object represents a non-directory file or a non-existent file, then
 782:    * <code>null</code> is returned.  The list of files will not contain
 783:    * any names such as "." or ".." which indicate the current or parent
 784:    * directory.  Also, the names are not guaranteed to be sorted.
 785:    * <p>
 786:    * In this form of the <code>list()</code> method, a filter is specified
 787:    * that allows the caller to control which files are returned in the
 788:    * list.  The <code>FilenameFilter</code> specified is called for each
 789:    * file returned to determine whether or not that file should be included
 790:    * in the list.
 791:    * <p>
 792:    * A <code>SecurityManager</code> check is made prior to reading the
 793:    * directory.  If read access to the directory is denied, an exception
 794:    * will be thrown.
 795:    *
 796:    * @param filter An object which will identify files to exclude from 
 797:    * the directory listing.
 798:    *
 799:    * @return An array of files in the directory, or <code>null</code> 
 800:    * if this object does not represent a valid directory.
 801:    * 
 802:    * @exception SecurityException If read access is not allowed to the 
 803:    * directory by the <code>SecurityManager</code>
 804:    */
 805:   public String[] list(FilenameFilter filter)
 806:   {
 807:     checkRead();
 808:     return (String[]) performList (filter, null, String.class);
 809:   }
 810: 
 811:   /**
 812:    * This method returns a array of <code>String</code>'s representing the
 813:    * list of files is then directory represented by this object.  If this
 814:    * object represents a non-directory file or a non-existent file, then
 815:    * <code>null</code> is returned.  The list of files will not contain
 816:    * any names such as "." or ".." which indicate the current or parent
 817:    * directory.  Also, the names are not guaranteed to be sorted.
 818:    * <p>
 819:    * A <code>SecurityManager</code> check is made prior to reading the
 820:    * directory.  If read access to the directory is denied, an exception
 821:    * will be thrown.
 822:    *
 823:    * @return An array of files in the directory, or <code>null</code> if 
 824:    * this object does not represent a valid directory.
 825:    * 
 826:    * @exception SecurityException If read access is not allowed to the 
 827:    * directory by the <code>SecurityManager</code>
 828:    */
 829:   public String[] list()
 830:   {
 831:     checkRead();
 832:     return (String[]) performList (null, null, String.class);
 833:   }
 834: 
 835:   /**
 836:    * This method returns an array of <code>File</code> objects representing
 837:    * all the files in the directory represented by this object. If this
 838:    * object does not represent a directory, <code>null</code> is returned.
 839:    * Each of the returned <code>File</code> object is constructed with this
 840:    * object as its parent.
 841:    * <p>
 842:    * A <code>SecurityManager</code> check is made prior to reading the
 843:    * directory.  If read access to the directory is denied, an exception
 844:    * will be thrown.
 845:    *
 846:    * @return An array of <code>File</code> objects for this directory.
 847:    *
 848:    * @exception SecurityException If the <code>SecurityManager</code> denies
 849:    * access to this directory.
 850:    *
 851:    * @since 1.2
 852:    */
 853:   public File[] listFiles()
 854:   {
 855:     checkRead();
 856:     return (File[]) performList (null, null, File.class);
 857:   }
 858:   
 859:   /**
 860:    * This method returns an array of <code>File</code> objects representing
 861:    * all the files in the directory represented by this object. If this
 862:    * object does not represent a directory, <code>null</code> is returned.
 863:    * Each of the returned <code>File</code> object is constructed with this
 864:    * object as its parent.
 865:    * <p> 
 866:    * In this form of the <code>listFiles()</code> method, a filter is specified
 867:    * that allows the caller to control which files are returned in the
 868:    * list.  The <code>FilenameFilter</code> specified is called for each
 869:    * file returned to determine whether or not that file should be included
 870:    * in the list.
 871:    * <p>
 872:    * A <code>SecurityManager</code> check is made prior to reading the
 873:    * directory.  If read access to the directory is denied, an exception
 874:    * will be thrown.
 875:    *
 876:    * @return An array of <code>File</code> objects for this directory.
 877:    *
 878:    * @exception SecurityException If the <code>SecurityManager</code> denies
 879:    * access to this directory.
 880:    *
 881:    * @since 1.2
 882:    */
 883:   public File[] listFiles(FilenameFilter filter)
 884:   {
 885:     checkRead();
 886:     return (File[]) performList (filter, null, File.class);
 887:   }
 888: 
 889:   /**
 890:    * This method returns an array of <code>File</code> objects representing
 891:    * all the files in the directory represented by this object. If this
 892:    * object does not represent a directory, <code>null</code> is returned.
 893:    * Each of the returned <code>File</code> object is constructed with this
 894:    * object as its parent.
 895:    * <p> 
 896:    * In this form of the <code>listFiles()</code> method, a filter is specified
 897:    * that allows the caller to control which files are returned in the
 898:    * list.  The <code>FileFilter</code> specified is called for each
 899:    * file returned to determine whether or not that file should be included
 900:    * in the list.
 901:    * <p>
 902:    * A <code>SecurityManager</code> check is made prior to reading the
 903:    * directory.  If read access to the directory is denied, an exception
 904:    * will be thrown.
 905:    *
 906:    * @return An array of <code>File</code> objects for this directory.
 907:    *
 908:    * @exception SecurityException If the <code>SecurityManager</code> denies
 909:    * access to this directory.
 910:    *
 911:    * @since 1.2
 912:    */
 913:   public File[] listFiles(FileFilter filter)
 914:   {
 915:     checkRead();
 916:     return (File[]) performList (null, filter, File.class);
 917:   }
 918: 
 919:   /**
 920:    * This method returns a <code>String</code> that is the path name of the
 921:    * file as returned by <code>getPath</code>.
 922:    *
 923:    * @return A <code>String</code> representation of this file
 924:    */
 925:   public String toString()
 926:   {
 927:     return path;
 928:   }
 929: 
 930:   /**
 931:    * @return A <code>URI</code> for this object.
 932:    */
 933:   public URI toURI()
 934:   {
 935:     String abspath = getAbsolutePath();
 936: 
 937:     if (isDirectory())
 938:       abspath = abspath + separator;
 939:         
 940:     try
 941:       {
 942:     return new URI("file", abspath.replace(separatorChar, '/'), null);
 943:       }
 944:     catch (URISyntaxException use)
 945:       {
 946:         // Can't happen.
 947:     throw new RuntimeException(use);
 948:       }
 949:   }
 950: 
 951:   /**
 952:    * This method returns a <code>URL</code> with the <code>file:</code>
 953:    * protocol that represents this file.  The exact form of this URL is
 954:    * system dependent.
 955:    *
 956:    * @return A <code>URL</code> for this object.
 957:    *
 958:    * @exception MalformedURLException If the URL cannot be created 
 959:    * successfully.
 960:    */
 961:   public URL toURL() throws MalformedURLException
 962:   {
 963:     // On Win32, Sun's JDK returns URLs of the form "file:/c:/foo/bar.txt",
 964:     // while on UNIX, it returns URLs of the form "file:/foo/bar.txt". 
 965:     if (separatorChar == '\\')
 966:       return new URL ("file:/" + getAbsolutePath().replace ('\\', '/')
 967:               + (isDirectory() ? "/" : ""));
 968:     else
 969:       return new URL ("file:" + getAbsolutePath()
 970:               + (isDirectory() ? "/" : ""));
 971:   }
 972: 
 973:   /*
 974:    * This native method actually creates the directory
 975:    */
 976:   private final native boolean performMkdir();
 977: 
 978:   /**
 979:    * This method creates a directory for the path represented by this object.
 980:    *
 981:    * @return <code>true</code> if the directory was created, 
 982:    * <code>false</code> otherwise
 983:    *
 984:    * @exception SecurityException If write access is not allowed to this file
 985:    */
 986:   public boolean mkdir()
 987:   {
 988:     checkWrite();
 989:     return performMkdir();
 990:   }
 991: 
 992:   private static boolean mkdirs (File x)
 993:   {
 994:     if (x.isDirectory())
 995:       return true;
 996:     String p = x.getPath();
 997:     String parent = x.getParent();
 998:     if (parent != null)
 999:       {
1000:     x.path = parent;
1001:     if (! mkdirs (x))
1002:       return false;
1003:     x.path = p;
1004:       }
1005:     return x.mkdir();
1006:   }
1007: 
1008:   /**
1009:    * This method creates a directory for the path represented by this file.
1010:    * It will also create any intervening parent directories if necessary.
1011:    *
1012:    * @return <code>true</code> if the directory was created, 
1013:    * <code>false</code> otherwise
1014:    *
1015:    * @exception SecurityException If write access is not allowed to this file
1016:    */
1017:   public boolean mkdirs()
1018:   {
1019:     checkWrite();
1020:     if (isDirectory())
1021:       return false;
1022:     return mkdirs (new File (path));
1023:   }
1024: 
1025:   private static synchronized String nextValue()
1026:   {
1027:     return Long.toString(counter++, Character.MAX_RADIX);
1028:   }
1029: 
1030:   /**
1031:    * This method creates a temporary file in the specified directory.  If 
1032:    * the directory name is null, then this method uses the system temporary 
1033:    * directory. The files created are guaranteed not to currently exist and 
1034:    * the same file name will never be used twice in the same virtual 
1035:    * machine instance.  
1036:    * The system temporary directory is determined by examinging the 
1037:    * <code>java.io.tmpdir</code> system property.
1038:    * <p>
1039:    * The <code>prefix</code> parameter is a sequence of at least three
1040:    * characters that are used as the start of the generated filename.  The
1041:    * <code>suffix</code> parameter is a sequence of characters that is used
1042:    * to terminate the file name.  This parameter may be <code>null</code>
1043:    * and if it is, the suffix defaults to ".tmp".
1044:    * <p>
1045:    * If a <code>SecurityManager</code> exists, then its <code>checkWrite</code>
1046:    * method is used to verify that this operation is permitted.
1047:    *
1048:    * @param prefix The character prefix to use in generating the path name.
1049:    * @param suffix The character suffix to use in generating the path name.
1050:    * @param directory The directory to create the file in, or 
1051:    * <code>null</code> for the default temporary directory
1052:    *
1053:    * @exception IllegalArgumentException If the patterns is not valid
1054:    * @exception SecurityException If there is no permission to perform 
1055:    * this operation
1056:    * @exception IOException If an error occurs
1057:    *
1058:    * @since 1.2
1059:    */
1060:   public static File createTempFile(String prefix, String suffix,
1061:                     File directory)
1062:     throws IOException
1063:   {
1064:     // Grab the system temp directory if necessary
1065:     if (directory == null)
1066:       {
1067:         String dirname = tmpdir;
1068:         if (dirname == null)
1069:           throw new IOException("Cannot determine system temporary directory"); 
1070:     
1071:         directory = new File(dirname);
1072:         if (!directory.exists())
1073:           throw new IOException("System temporary directory "
1074:                                 + directory.getName() + " does not exist.");
1075:         if (!directory.isDirectory())
1076:           throw new IOException("System temporary directory "
1077:                                 + directory.getName()
1078:                                 + " is not really a directory.");
1079:       }
1080: 
1081:     // Check if prefix is at least 3 characters long
1082:     if (prefix.length() < 3)
1083:       throw new IllegalArgumentException("Prefix too short: " + prefix);
1084: 
1085:     // Set default value of suffix
1086:     if (suffix == null)
1087:       suffix = ".tmp";
1088: 
1089:     // Truncation rules.
1090:     // `6' is the number of characters we generate.
1091:     if (prefix.length() + 6 + suffix.length() > maxPathLen)
1092:       {
1093:     int suf_len = 0;
1094:     if (suffix.charAt(0) == '.')
1095:       suf_len = 4;
1096:     suffix = suffix.substring(0, suf_len);
1097:     if (prefix.length() + 6 + suf_len > maxPathLen)
1098:       prefix = prefix.substring(0, maxPathLen - 6 - suf_len);
1099:       }
1100: 
1101:     File f;
1102: 
1103:     // How many times should we try?  We choose 100.
1104:     for (int i = 0; i < 100; ++i)
1105:       {
1106:     // This is ugly.
1107:     String t = "ZZZZZZ" + nextValue();
1108:     String l = prefix + t.substring(t.length() - 6) + suffix;
1109:     try
1110:       {
1111:         f = new File(directory, l);
1112:         if (f.createNewFile())
1113:           return f;
1114:       }
1115:     catch (IOException ignored)
1116:       {
1117:       }
1118:       }
1119: 
1120:     throw new IOException ("cannot create temporary file");
1121:   }
1122: 
1123:   /*
1124:    * This native method sets the permissions to make the file read only.
1125:    */
1126:   private native boolean performSetReadOnly();
1127: 
1128:   /**
1129:    * This method sets the file represented by this object to be read only.
1130:    * A read only file or directory cannot be modified.  Please note that 
1131:    * GNU systems allow read only files to be deleted if the directory it
1132:    * is contained in is writable.
1133:    *
1134:    * @return <code>true</code> if the operation succeeded, <code>false</code>
1135:    * otherwise.
1136:    *
1137:    * @exception SecurityException If the <code>SecurityManager</code> does
1138:    * not allow this operation.
1139:    *
1140:    * @since 1.2
1141:    */
1142:   public boolean setReadOnly()
1143:   {
1144:     // Do a security check before trying to do anything else.
1145:     checkWrite();
1146:     return performSetReadOnly();
1147:   }
1148: 
1149:   private static native File[] performListRoots();
1150: 
1151:   /**
1152:    * This method returns an array of filesystem roots.  Some operating systems
1153:    * have volume oriented filesystem.  This method provides a mechanism for
1154:    * determining which volumes exist.  GNU systems use a single hierarchical
1155:    * filesystem, so will have only one "/" filesystem root.
1156:    *
1157:    * @return An array of <code>File</code> objects for each filesystem root
1158:    * available.
1159:    *
1160:    * @since 1.2
1161:    */
1162:   public static File[] listRoots()
1163:   {
1164:     File[] roots = performListRoots();
1165:     
1166:     SecurityManager s = System.getSecurityManager();
1167:     if (s != null)
1168:       {
1169:     // Only return roots to which the security manager permits read access.
1170:     int count = roots.length;
1171:     for (int i = 0; i < roots.length; i++)
1172:       {
1173:         try
1174:           {
1175:             s.checkRead (roots[i].path);        
1176:           }
1177:         catch (SecurityException sx)
1178:           {
1179:             roots[i] = null;
1180:         count--;
1181:           }
1182:       }
1183:     if (count != roots.length)
1184:       {
1185:         File[] newRoots = new File[count];
1186:         int k = 0;
1187:         for (int i=0; i < roots.length; i++)
1188:           {
1189:             if (roots[i] != null)
1190:           newRoots[k++] = roots[i];
1191:           }
1192:         roots = newRoots;
1193:       }
1194:       }
1195:     return roots;
1196:   }
1197: 
1198:   /**
1199:    * This method creates a temporary file in the system temporary directory. 
1200:    * The files created are guaranteed not to currently exist and the same file
1201:    * name will never be used twice in the same virtual machine instance.  The
1202:    * system temporary directory is determined by examinging the 
1203:    * <code>java.io.tmpdir</code> system property.
1204:    * <p>
1205:    * The <code>prefix</code> parameter is a sequence of at least three
1206:    * characters that are used as the start of the generated filename.  The
1207:    * <code>suffix</code> parameter is a sequence of characters that is used
1208:    * to terminate the file name.  This parameter may be <code>null</code>
1209:    * and if it is, the suffix defaults to ".tmp".
1210:    * <p>
1211:    * If a <code>SecurityManager</code> exists, then its <code>checkWrite</code>
1212:    * method is used to verify that this operation is permitted.
1213:    * <p>
1214:    * This method is identical to calling 
1215:    * <code>createTempFile(prefix, suffix, null)</code>.
1216:    *
1217:    * @param prefix The character prefix to use in generating the path name.
1218:    * @param suffix The character suffix to use in generating the path name.
1219:    *
1220:    * @exception IllegalArgumentException If the prefix or suffix are not valid.
1221:    * @exception SecurityException If there is no permission to perform 
1222:    * this operation
1223:    * @exception IOException If an error occurs
1224:    */
1225:   public static File createTempFile(String prefix, String suffix)
1226:     throws IOException
1227:   {
1228:     return createTempFile(prefix, suffix, null);
1229:   }
1230: 
1231:   /**
1232:    * This method compares the specified <code>File</code> to this one
1233:    * to test for equality.  It does this by comparing the canonical path names
1234:    * of the files. 
1235:    * <p>
1236:    * The canonical paths of the files are determined by calling the
1237:    * <code>getCanonicalPath</code> method on each object.
1238:    * <p>
1239:    * This method returns a 0 if the specified <code>Object</code> is equal
1240:    * to this one, a negative value if it is less than this one 
1241:    * a positive value if it is greater than this one.
1242:    *
1243:    * @return An integer as described above
1244:    *
1245:    * @since 1.2
1246:    */
1247:   public int compareTo(File other)
1248:   {
1249:     if (caseSensitive)
1250:       return path.compareTo (other.path);
1251:     else
1252:       return path.compareToIgnoreCase (other.path);
1253:   }
1254: 
1255:   /**
1256:    * This method compares the specified <code>Object</code> to this one
1257:    * to test for equality.  It does this by comparing the canonical path names
1258:    * of the files.  This method is identical to <code>compareTo(File)</code>
1259:    * except that if the <code>Object</code> passed to it is not a 
1260:    * <code>File</code>, it throws a <code>ClassCastException</code>
1261:    * <p>
1262:    * The canonical paths of the files are determined by calling the
1263:    * <code>getCanonicalPath</code> method on each object.
1264:    * <p>
1265:    * This method returns a 0 if the specified <code>Object</code> is equal
1266:    * to this one, a negative value if it is less than this one 
1267:    * a positive value if it is greater than this one.
1268:    *
1269:    * @return An integer as described above
1270:    *
1271:    * @exception ClassCastException If the passed <code>Object</code> is 
1272:    * not a <code>File</code>
1273:    *
1274:    * @since 1.2
1275:    */
1276:   public int compareTo(Object obj)
1277:   {
1278:     return compareTo((File) obj);
1279:   }
1280: 
1281:   /*
1282:    * This native method actually performs the rename.
1283:    */
1284:   private native boolean performRenameTo (File dest);
1285: 
1286:   /**
1287:    * This method renames the file represented by this object to the path
1288:    * of the file represented by the argument <code>File</code>.
1289:    *
1290:    * @param dest The <code>File</code> object representing the target name
1291:    *
1292:    * @return <code>true</code> if the rename succeeds, <code>false</code> 
1293:    * otherwise.
1294:    *
1295:    * @exception SecurityException If write access is not allowed to the 
1296:    * file by the <code>SecurityMananger</code>.
1297:    */
1298:   public synchronized boolean renameTo(File dest)
1299:   {
1300:     SecurityManager s = System.getSecurityManager();
1301:     String sname = getName();
1302:     String dname = dest.getName();
1303:     if (s != null)
1304:       {
1305:     s.checkWrite (sname);
1306:     s.checkWrite (dname);
1307:       }
1308:     return performRenameTo (dest);
1309:   }
1310: 
1311:   /*
1312:    * This method does the actual setting of the modification time.
1313:    */
1314:   private native boolean performSetLastModified(long time);
1315:  
1316:   /**
1317:    * This method sets the modification time on the file to the specified
1318:    * value.  This is specified as the number of seconds since midnight
1319:    * on January 1, 1970 GMT.
1320:    *
1321:    * @param time The desired modification time.
1322:    *
1323:    * @return <code>true</code> if the operation succeeded, <code>false</code>
1324:    * otherwise.
1325:    *
1326:    * @exception IllegalArgumentException If the specified time is negative.
1327:    * @exception SecurityException If the <code>SecurityManager</code> will
1328:    * not allow this operation.
1329:    *
1330:    * @since 1.2
1331:    */
1332:   public boolean setLastModified(long time) 
1333:   {
1334:     if (time < 0)
1335:       throw new IllegalArgumentException("Negative modification time: " + time);
1336: 
1337:     checkWrite();
1338:     return performSetLastModified(time);
1339:   }
1340: 
1341:   private void checkWrite()
1342:   {
1343:     // Check the SecurityManager
1344:     SecurityManager s = System.getSecurityManager();
1345:     
1346:     if (s != null)
1347:       s.checkWrite(path);
1348:   }
1349: 
1350:   private void checkRead()
1351:   {
1352:     // Check the SecurityManager
1353:     SecurityManager s = System.getSecurityManager();
1354:     
1355:     if (s != null)
1356:       s.checkRead(path);
1357:   }
1358: 
1359:   /** 
1360:    * Calling this method requests that the file represented by this object
1361:    * be deleted when the virtual machine exits.  Note that this request cannot
1362:    * be cancelled.  Also, it will only be carried out if the virtual machine
1363:    * exits normally.
1364:    *
1365:    * @exception SecurityException If deleting of the file is not allowed
1366:    *
1367:    * @since 1.2 
1368:    */
1369:   // FIXME: This should use the ShutdownHook API once we implement that.
1370:   public void deleteOnExit()
1371:   {
1372:     // Check the SecurityManager
1373:     SecurityManager sm = System.getSecurityManager();
1374:     if (sm != null)
1375:       sm.checkDelete (getName());
1376: 
1377:     DeleteFileHelper.add(this);
1378:   }
1379: 
1380:   private void writeObject(ObjectOutputStream oos) throws IOException
1381:   {
1382:     oos.defaultWriteObject();
1383:     oos.writeChar(separatorChar);
1384:   }
1385: 
1386:   private void readObject(ObjectInputStream ois)
1387:     throws ClassNotFoundException, IOException
1388:   {
1389:     ois.defaultReadObject();
1390: 
1391:     // If the file was from an OS with a different dir separator,
1392:     // fixup the path to use the separator on this OS.
1393:     char oldSeparatorChar = ois.readChar();
1394:     
1395:     if (oldSeparatorChar != separatorChar)
1396:       path = path.replace(oldSeparatorChar, separatorChar);
1397:   }
1398:   
1399: } // class File