1 /*
2 * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javax.swing.filechooser;
27
28 import java.awt.Image;
29 import java.beans.PropertyChangeListener;
30 import java.io.File;
31 import java.io.FileNotFoundException;
32 import java.io.IOException;
33 import java.lang.ref.WeakReference;
34 import java.security.AccessController;
35 import java.security.PrivilegedAction;
36 import java.text.MessageFormat;
37 import java.util.ArrayList;
38 import java.util.List;
39
40 import javax.swing.Icon;
41 import javax.swing.ImageIcon;
42 import javax.swing.JFileChooser;
43 import javax.swing.UIManager;
44
45 import jdk.internal.ref.CleanerFactory;
46 import sun.awt.shell.ShellFolder;
47
48 /**
49 * FileSystemView is JFileChooser's gateway to the
50 * file system. Since the JDK1.1 File API doesn't allow
51 * access to such information as root partitions, file type
52 * information, or hidden file bits, this class is designed
53 * to intuit as much OS-specific file system information as
54 * possible.
55 *
56 * <p>
57 *
58 * Java Licensees may want to provide a different implementation of
59 * FileSystemView to better handle a given operating system.
60 *
61 * @author Jeff Dinkins
62 */
63
64 // PENDING(jeff) - need to provide a specification for
65 // how Mac/OS2/BeOS/etc file systems can modify FileSystemView
66 // to handle their particular type of file system.
67
68 public abstract class FileSystemView {
69
70 static FileSystemView windowsFileSystemView = null;
71 static FileSystemView unixFileSystemView = null;
72 //static FileSystemView macFileSystemView = null;
73 static FileSystemView genericFileSystemView = null;
74
75 private boolean useSystemExtensionHiding =
76 UIManager.getDefaults().getBoolean("FileChooser.useSystemExtensionHiding");
77
78 /**
79 * Returns the file system view.
80 * @return the file system view
81 */
82 public static FileSystemView getFileSystemView() {
83 if(File.separatorChar == '\\') {
84 if(windowsFileSystemView == null) {
85 windowsFileSystemView = new WindowsFileSystemView();
86 }
87 return windowsFileSystemView;
88 }
89
90 if(File.separatorChar == '/') {
91 if(unixFileSystemView == null) {
92 unixFileSystemView = new UnixFileSystemView();
93 }
94 return unixFileSystemView;
95 }
96
97 // if(File.separatorChar == ':') {
98 // if(macFileSystemView == null) {
99 // macFileSystemView = new MacFileSystemView();
100 // }
101 // return macFileSystemView;
102 //}
103
104 if(genericFileSystemView == null) {
105 genericFileSystemView = new GenericFileSystemView();
106 }
107 return genericFileSystemView;
108 }
109
110 /**
111 * Constructs a FileSystemView.
112 */
113 public FileSystemView() {
114 final WeakReference<FileSystemView> weakReference = new WeakReference<>(this);
115 final PropertyChangeListener pcl = evt -> {
116 final FileSystemView fsv = weakReference.get();
117 if (fsv != null && evt.getPropertyName().equals("lookAndFeel")) {
118 fsv.useSystemExtensionHiding =
119 UIManager.getDefaults().getBoolean(
120 "FileChooser.useSystemExtensionHiding");
121 }
122 };
123
124 UIManager.addPropertyChangeListener(pcl);
125 CleanerFactory.cleaner().register(this, () -> {
126 UIManager.removePropertyChangeListener(pcl);
127 });
128 }
129
130 /**
131 * Determines if the given file is a root in the navigable tree(s).
132 * Examples: Windows 98 has one root, the Desktop folder. DOS has one root
133 * per drive letter, <code>C:\</code>, <code>D:\</code>, etc. Unix has one root,
134 * the <code>"/"</code> directory.
135 *
136 * The default implementation gets information from the <code>ShellFolder</code> class.
137 *
138 * @param f a <code>File</code> object representing a directory
139 * @return <code>true</code> if <code>f</code> is a root in the navigable tree.
140 * @see #isFileSystemRoot
141 */
142 public boolean isRoot(File f) {
143 if (f == null || !f.isAbsolute()) {
144 return false;
145 }
146
147 File[] roots = getRoots();
148 for (File root : roots) {
149 if (root.equals(f)) {
150 return true;
151 }
152 }
153 return false;
154 }
155
156 /**
157 * Returns true if the file (directory) can be visited.
158 * Returns false if the directory cannot be traversed.
159 *
160 * @param f the <code>File</code>
161 * @return <code>true</code> if the file/directory can be traversed, otherwise <code>false</code>
162 * @see JFileChooser#isTraversable
163 * @see FileView#isTraversable
164 * @since 1.4
165 */
166 public Boolean isTraversable(File f) {
167 return Boolean.valueOf(f.isDirectory());
168 }
169
170 /**
171 * Name of a file, directory, or folder as it would be displayed in
172 * a system file browser. Example from Windows: the "M:\" directory
173 * displays as "CD-ROM (M:)"
174 *
175 * The default implementation gets information from the ShellFolder class.
176 *
177 * @param f a <code>File</code> object
178 * @return the file name as it would be displayed by a native file chooser
179 * @see JFileChooser#getName
180 * @since 1.4
181 */
182 public String getSystemDisplayName(File f) {
183 if (f == null) {
184 return null;
185 }
186
187 String name = f.getName();
188
189 if (!name.equals("..") && !name.equals(".") &&
190 (useSystemExtensionHiding || !isFileSystem(f) || isFileSystemRoot(f)) &&
191 (f instanceof ShellFolder || f.exists())) {
192
193 try {
194 name = getShellFolder(f).getDisplayName();
195 } catch (FileNotFoundException e) {
196 return null;
197 }
198
199 if (name == null || name.length() == 0) {
200 name = f.getPath(); // e.g. "/"
201 }
202 }
203
204 return name;
205 }
206
207 /**
208 * Type description for a file, directory, or folder as it would be displayed in
209 * a system file browser. Example from Windows: the "Desktop" folder
210 * is described as "Desktop".
211 *
212 * Override for platforms with native ShellFolder implementations.
213 *
214 * @param f a <code>File</code> object
215 * @return the file type description as it would be displayed by a native file chooser
216 * or null if no native information is available.
217 * @see JFileChooser#getTypeDescription
218 * @since 1.4
219 */
220 public String getSystemTypeDescription(File f) {
221 return null;
222 }
223
224 /**
225 * Returns icon for a file, directory, or folder as it would be displayed in
226 * a system file browser. Example from Windows: the "M:\" directory
227 * displays a CD-ROM icon.
228 *
229 * @param f a <code>File</code> object
230 * @return an icon as it would be displayed by a native file chooser
231 * @see JFileChooser#getIcon
232 * @since 1.4
233 */
234 public Icon getSystemIcon(File f) {
235 if (f == null) {
236 return null;
237 }
238
239 ShellFolder sf;
240
241 try {
242 sf = getShellFolder(f);
243 } catch (FileNotFoundException e) {
244 return null;
245 }
246
247 Image img = sf.getIcon(false);
248
249 if (img != null) {
250 return new ImageIcon(img, sf.getFolderType());
251 } else {
252 return UIManager.getIcon(f.isDirectory() ? "FileView.directoryIcon" : "FileView.fileIcon");
253 }
254 }
255
256 /**
257 * Icon for a file, directory, or folder as it would be displayed in
258 * a system file browser for the requested size.
259 *
260 * The default implementation gets information from the ShellFolder class.
261 *
262 * @param f a <code>File</code> object
263 * @param size width and height of the icon in pixels to be scaled(valid range: 1 to 256)
264 * @return an icon as it would be displayed by a native file chooser
265 * @see JFileChooser#getIcon
266 * @since 12
267 */
268 protected Icon getSystemIcon(File f, int size) {
269 if (f == null) {
270 return null;
271 }
272
273 if (size > 256 || size < 1) {
274 return null;
275 }
276
277 ShellFolder sf;
278 try {
279 sf = getShellFolder(f);
280 } catch (FileNotFoundException e) {
281 return null;
282 }
283
284 Image img = sf.getIcon(size);
285 if (img != null) {
286 return new ImageIcon(img, sf.getFolderType());
287 } else {
288 return UIManager.getIcon(f.isDirectory() ? "FileView.directoryIcon" : "FileView.fileIcon");
289 }
290 }
291
292 /**
293 * On Windows, a file can appear in multiple folders, other than its
294 * parent directory in the filesystem. Folder could for example be the
295 * "Desktop" folder which is not the same as file.getParentFile().
296 *
297 * @param folder a <code>File</code> object representing a directory or special folder
298 * @param file a <code>File</code> object
299 * @return <code>true</code> if <code>folder</code> is a directory or special folder and contains <code>file</code>.
300 * @since 1.4
301 */
302 public boolean isParent(File folder, File file) {
303 if (folder == null || file == null) {
304 return false;
305 } else if (folder instanceof ShellFolder) {
306 File parent = file.getParentFile();
307 if (parent != null && parent.equals(folder)) {
308 return true;
309 }
310 File[] children = getFiles(folder, false);
311 for (File child : children) {
312 if (file.equals(child)) {
313 return true;
314 }
315 }
316 return false;
317 } else {
318 return folder.equals(file.getParentFile());
319 }
320 }
321
322 /**
323 *
324 * @param parent a <code>File</code> object representing a directory or special folder
325 * @param fileName a name of a file or folder which exists in <code>parent</code>
326 * @return a File object. This is normally constructed with <code>new
327 * File(parent, fileName)</code> except when parent and child are both
328 * special folders, in which case the <code>File</code> is a wrapper containing
329 * a <code>ShellFolder</code> object.
330 * @since 1.4
331 */
332 public File getChild(File parent, String fileName) {
333 if (parent instanceof ShellFolder) {
334 File[] children = getFiles(parent, false);
335 for (File child : children) {
336 if (child.getName().equals(fileName)) {
337 return child;
338 }
339 }
340 }
341 return createFileObject(parent, fileName);
342 }
343
344
345 /**
346 * Checks if <code>f</code> represents a real directory or file as opposed to a
347 * special folder such as <code>"Desktop"</code>. Used by UI classes to decide if
348 * a folder is selectable when doing directory choosing.
349 *
350 * @param f a <code>File</code> object
351 * @return <code>true</code> if <code>f</code> is a real file or directory.
352 * @since 1.4
353 */
354 public boolean isFileSystem(File f) {
355 if (f instanceof ShellFolder) {
356 ShellFolder sf = (ShellFolder)f;
357 // Shortcuts to directories are treated as not being file system objects,
358 // so that they are never returned by JFileChooser.
359 return sf.isFileSystem() && !(sf.isLink() && sf.isDirectory());
360 } else {
361 return true;
362 }
363 }
364
365 /**
366 * Creates a new folder with a default folder name.
367 *
368 * @param containingDir a {@code File} object denoting directory to contain the new folder
369 * @return a {@code File} object denoting the newly created folder
370 * @throws IOException if new folder could not be created
371 */
372 public abstract File createNewFolder(File containingDir) throws IOException;
373
374 /**
375 * Returns whether a file is hidden or not.
376 *
377 * @param f a {@code File} object
378 * @return true if the given {@code File} denotes a hidden file
379 */
380 public boolean isHiddenFile(File f) {
381 return f.isHidden();
382 }
383
384
385 /**
386 * Is dir the root of a tree in the file system, such as a drive
387 * or partition. Example: Returns true for "C:\" on Windows 98.
388 *
389 * @param dir a <code>File</code> object representing a directory
390 * @return <code>true</code> if <code>f</code> is a root of a filesystem
391 * @see #isRoot
392 * @since 1.4
393 */
394 public boolean isFileSystemRoot(File dir) {
395 return ShellFolder.isFileSystemRoot(dir);
396 }
397
398 /**
399 * Used by UI classes to decide whether to display a special icon
400 * for drives or partitions, e.g. a "hard disk" icon.
401 *
402 * The default implementation has no way of knowing, so always returns false.
403 *
404 * @param dir a directory
405 * @return <code>false</code> always
406 * @since 1.4
407 */
408 public boolean isDrive(File dir) {
409 return false;
410 }
411
412 /**
413 * Used by UI classes to decide whether to display a special icon
414 * for a floppy disk. Implies isDrive(dir).
415 *
416 * The default implementation has no way of knowing, so always returns false.
417 *
418 * @param dir a directory
419 * @return <code>false</code> always
420 * @since 1.4
421 */
422 public boolean isFloppyDrive(File dir) {
423 return false;
424 }
425
426 /**
427 * Used by UI classes to decide whether to display a special icon
428 * for a computer node, e.g. "My Computer" or a network server.
429 *
430 * The default implementation has no way of knowing, so always returns false.
431 *
432 * @param dir a directory
433 * @return <code>false</code> always
434 * @since 1.4
435 */
436 public boolean isComputerNode(File dir) {
437 return ShellFolder.isComputerNode(dir);
438 }
439
440
441 /**
442 * Returns all root partitions on this system. For example, on
443 * Windows, this would be the "Desktop" folder, while on DOS this
444 * would be the A: through Z: drives.
445 *
446 * @return an array of {@code File} objects representing all root partitions
447 * on this system
448 */
449 public File[] getRoots() {
450 // Don't cache this array, because filesystem might change
451 File[] roots = (File[])ShellFolder.get("roots");
452
453 for (int i = 0; i < roots.length; i++) {
454 if (isFileSystemRoot(roots[i])) {
455 roots[i] = createFileSystemRoot(roots[i]);
456 }
457 }
458 return roots;
459 }
460
461
462 // Providing default implementations for the remaining methods
463 // because most OS file systems will likely be able to use this
464 // code. If a given OS can't, override these methods in its
465 // implementation.
466
467 /**
468 * Returns the home directory.
469 * @return the home directory
470 */
471 public File getHomeDirectory() {
472 return createFileObject(System.getProperty("user.home"));
473 }
474
475 /**
476 * Return the user's default starting directory for the file chooser.
477 *
478 * @return a <code>File</code> object representing the default
479 * starting folder
480 * @since 1.4
481 */
482 public File getDefaultDirectory() {
483 File f = (File)ShellFolder.get("fileChooserDefaultFolder");
484 if (isFileSystemRoot(f)) {
485 f = createFileSystemRoot(f);
486 }
487 return f;
488 }
489
490 /**
491 * Returns a File object constructed in dir from the given filename.
492 *
493 * @param dir an abstract pathname denoting a directory
494 * @param filename a {@code String} representation of a pathname
495 * @return a {@code File} object created from {@code dir} and {@code filename}
496 */
497 public File createFileObject(File dir, String filename) {
498 if(dir == null) {
499 return new File(filename);
500 } else {
501 return new File(dir, filename);
502 }
503 }
504
505 /**
506 * Returns a File object constructed from the given path string.
507 *
508 * @param path {@code String} representation of path
509 * @return a {@code File} object created from the given {@code path}
510 */
511 public File createFileObject(String path) {
512 File f = new File(path);
513 if (isFileSystemRoot(f)) {
514 f = createFileSystemRoot(f);
515 }
516 return f;
517 }
518
519
520 /**
521 * Gets the list of shown (i.e. not hidden) files.
522 *
523 * @param dir the root directory of files to be returned
524 * @param useFileHiding determine if hidden files are returned
525 * @return an array of {@code File} objects representing files and
526 * directories in the given {@code dir}. It includes hidden
527 * files if {@code useFileHiding} is false.
528 */
529 public File[] getFiles(File dir, boolean useFileHiding) {
530 List<File> files = new ArrayList<File>();
531
532 // add all files in dir
533 if (!(dir instanceof ShellFolder)) {
534 try {
535 dir = getShellFolder(dir);
536 } catch (FileNotFoundException e) {
537 return new File[0];
538 }
539 }
540
541 File[] names = ((ShellFolder) dir).listFiles(!useFileHiding);
542
543 if (names == null) {
544 return new File[0];
545 }
546
547 for (File f : names) {
548 if (Thread.currentThread().isInterrupted()) {
549 break;
550 }
551
552 if (!(f instanceof ShellFolder)) {
553 if (isFileSystemRoot(f)) {
554 f = createFileSystemRoot(f);
555 }
556 try {
557 f = ShellFolder.getShellFolder(f);
558 } catch (FileNotFoundException e) {
559 // Not a valid file (wouldn't show in native file chooser)
560 // Example: C:\pagefile.sys
561 continue;
562 } catch (InternalError e) {
563 // Not a valid file (wouldn't show in native file chooser)
564 // Example C:\Winnt\Profiles\joe\history\History.IE5
565 continue;
566 }
567 }
568 if (!useFileHiding || !isHiddenFile(f)) {
569 files.add(f);
570 }
571 }
572
573 return files.toArray(new File[files.size()]);
574 }
575
576
577
578 /**
579 * Returns the parent directory of <code>dir</code>.
580 * @param dir the <code>File</code> being queried
581 * @return the parent directory of <code>dir</code>, or
582 * <code>null</code> if <code>dir</code> is <code>null</code>
583 */
584 public File getParentDirectory(File dir) {
585 if (dir == null || !dir.exists()) {
586 return null;
587 }
588
589 ShellFolder sf;
590
591 try {
592 sf = getShellFolder(dir);
593 } catch (FileNotFoundException e) {
594 return null;
595 }
596
597 File psf = sf.getParentFile();
598
599 if (psf == null) {
600 return null;
601 }
602
603 if (isFileSystem(psf)) {
604 File f = psf;
605 if (!f.exists()) {
606 // This could be a node under "Network Neighborhood".
607 File ppsf = psf.getParentFile();
608 if (ppsf == null || !isFileSystem(ppsf)) {
609 // We're mostly after the exists() override for windows below.
610 f = createFileSystemRoot(f);
611 }
612 }
613 return f;
614 } else {
615 return psf;
616 }
617 }
618
619 /**
620 * Returns an array of files representing the values to show by default in
621 * the file chooser selector.
622 *
623 * @return an array of {@code File} objects.
624 * @throws SecurityException if the caller does not have necessary
625 * permissions
626 * @since 9
627 */
628 public File[] getChooserComboBoxFiles() {
629 return (File[]) ShellFolder.get("fileChooserComboBoxFolders");
630 }
631
632 /**
633 * Returns whether the specified file denotes a shell interpreted link which
634 * can be obtained by the {@link #getLinkLocation(File)}.
635 *
636 * @param file a file
637 * @return whether this is a link
638 * @throws NullPointerException if {@code file} equals {@code null}
639 * @throws SecurityException if the caller does not have necessary
640 * permissions
641 * @see #getLinkLocation(File)
642 * @since 9
643 */
644 public boolean isLink(File file) {
645 if (file == null) {
646 throw new NullPointerException("file is null");
647 }
648 try {
649 return ShellFolder.getShellFolder(file).isLink();
650 } catch (FileNotFoundException e) {
651 return false;
652 }
653 }
654
655 /**
656 * Returns the regular file referenced by the specified link file if
657 * the specified file is a shell interpreted link.
658 * Returns {@code null} if the specified file is not
659 * a shell interpreted link.
660 *
661 * @param file a file
662 * @return the linked file or {@code null}.
663 * @throws FileNotFoundException if the linked file does not exist
664 * @throws NullPointerException if {@code file} equals {@code null}
665 * @throws SecurityException if the caller does not have necessary
666 * permissions
667 * @since 9
668 */
669 public File getLinkLocation(File file) throws FileNotFoundException {
670 if (file == null) {
671 throw new NullPointerException("file is null");
672 }
673 ShellFolder shellFolder;
674 try {
675 shellFolder = ShellFolder.getShellFolder(file);
676 } catch (FileNotFoundException e) {
677 return null;
678 }
679 return shellFolder.isLink() ? shellFolder.getLinkLocation() : null;
680 }
681
682 /**
683 * Throws {@code FileNotFoundException} if file not found or current thread was interrupted
684 */
685 ShellFolder getShellFolder(File f) throws FileNotFoundException {
686 if (!(f instanceof ShellFolder) && !(f instanceof FileSystemRoot) && isFileSystemRoot(f)) {
687 f = createFileSystemRoot(f);
688 }
689
690 try {
691 return ShellFolder.getShellFolder(f);
692 } catch (InternalError e) {
693 System.err.println("FileSystemView.getShellFolder: f="+f);
694 e.printStackTrace();
695 return null;
696 }
697 }
698
699 /**
700 * Creates a new <code>File</code> object for <code>f</code> with correct
701 * behavior for a file system root directory.
702 *
703 * @param f a <code>File</code> object representing a file system root
704 * directory, for example "/" on Unix or "C:\" on Windows.
705 * @return a new <code>File</code> object
706 * @since 1.4
707 */
708 protected File createFileSystemRoot(File f) {
709 return new FileSystemRoot(f);
710 }
711
712 @SuppressWarnings("serial") // Same-version serialization only
713 static class FileSystemRoot extends File {
714 public FileSystemRoot(File f) {
715 super(f,"");
716 }
717
718 public FileSystemRoot(String s) {
719 super(s);
720 }
721
722 public boolean isDirectory() {
723 return true;
724 }
725
726 public String getName() {
727 return getPath();
728 }
729 }
730 }
731
732 /**
733 * FileSystemView that handles some specific unix-isms.
734 */
735 class UnixFileSystemView extends FileSystemView {
736
737 private static final String newFolderString =
738 UIManager.getString("FileChooser.other.newFolder");
739 private static final String newFolderNextString =
740 UIManager.getString("FileChooser.other.newFolder.subsequent");
741
742 /**
743 * Creates a new folder with a default folder name.
744 */
745 public File createNewFolder(File containingDir) throws IOException {
746 if(containingDir == null) {
747 throw new IOException("Containing directory is null:");
748 }
749 File newFolder;
750 // Unix - using OpenWindows' default folder name. Can't find one for Motif/CDE.
751 newFolder = createFileObject(containingDir, newFolderString);
752 int i = 1;
753 while (newFolder.exists() && i < 100) {
754 newFolder = createFileObject(containingDir, MessageFormat.format(
755 newFolderNextString, i));
756 i++;
757 }
758
759 if(newFolder.exists()) {
760 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
761 } else {
762 if(!newFolder.mkdirs()) {
763 throw new IOException(newFolder.getAbsolutePath());
764 }
765 }
766
767 return newFolder;
768 }
769
770 public boolean isFileSystemRoot(File dir) {
771 return dir != null && dir.getAbsolutePath().equals("/");
772 }
773
774 public boolean isDrive(File dir) {
775 return isFloppyDrive(dir);
776 }
777
778 public boolean isFloppyDrive(File dir) {
779 // Could be looking at the path for Solaris, but wouldn't be reliable.
780 // For example:
781 // return (dir != null && dir.getAbsolutePath().toLowerCase().startsWith("/floppy"));
782 return false;
783 }
784
785 public boolean isComputerNode(File dir) {
786 if (dir != null) {
787 String parent = dir.getParent();
788 if (parent != null && parent.equals("/net")) {
789 return true;
790 }
791 }
792 return false;
793 }
794 }
795
796
797 /**
798 * FileSystemView that handles some specific windows concepts.
799 */
800 class WindowsFileSystemView extends FileSystemView {
801
802 private static final String newFolderString =
803 UIManager.getString("FileChooser.win32.newFolder");
804 private static final String newFolderNextString =
805 UIManager.getString("FileChooser.win32.newFolder.subsequent");
806
807 public Boolean isTraversable(File f) {
808 return Boolean.valueOf(isFileSystemRoot(f) || isComputerNode(f) || f.isDirectory());
809 }
810
811 public File getChild(File parent, String fileName) {
812 if (fileName.startsWith("\\")
813 && !fileName.startsWith("\\\\")
814 && isFileSystem(parent)) {
815
816 //Path is relative to the root of parent's drive
817 String path = parent.getAbsolutePath();
818 if (path.length() >= 2
819 && path.charAt(1) == ':'
820 && Character.isLetter(path.charAt(0))) {
821
822 return createFileObject(path.substring(0, 2) + fileName);
823 }
824 }
825 return super.getChild(parent, fileName);
826 }
827
828 /**
829 * Type description for a file, directory, or folder as it would be displayed in
830 * a system file browser. Example from Windows: the "Desktop" folder
831 * is described as "Desktop".
832 *
833 * The Windows implementation gets information from the ShellFolder class.
834 */
835 public String getSystemTypeDescription(File f) {
836 if (f == null) {
837 return null;
838 }
839
840 try {
841 return getShellFolder(f).getFolderType();
842 } catch (FileNotFoundException e) {
843 return null;
844 }
845 }
846
847 /**
848 * @return the Desktop folder.
849 */
850 public File getHomeDirectory() {
851 File[] roots = getRoots();
852 return (roots.length == 0) ? null : roots[0];
853 }
854
855 /**
856 * Creates a new folder with a default folder name.
857 */
858 public File createNewFolder(File containingDir) throws IOException {
859 if(containingDir == null) {
860 throw new IOException("Containing directory is null:");
861 }
862 // Using NT's default folder name
863 File newFolder = createFileObject(containingDir, newFolderString);
864 int i = 2;
865 while (newFolder.exists() && i < 100) {
866 newFolder = createFileObject(containingDir, MessageFormat.format(
867 newFolderNextString, i));
868 i++;
869 }
870
871 if(newFolder.exists()) {
872 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
873 } else {
874 if(!newFolder.mkdirs()) {
875 throw new IOException(newFolder.getAbsolutePath());
876 }
877 }
878
879 return newFolder;
880 }
881
882 public boolean isDrive(File dir) {
883 return isFileSystemRoot(dir);
884 }
885
886 public boolean isFloppyDrive(final File dir) {
887 String path = AccessController.doPrivileged(new PrivilegedAction<String>() {
888 public String run() {
889 return dir.getAbsolutePath();
890 }
891 });
892
893 return path != null && (path.equals("A:\\") || path.equals("B:\\"));
894 }
895
896 /**
897 * Returns a File object constructed from the given path string.
898 */
899 public File createFileObject(String path) {
900 // Check for missing backslash after drive letter such as "C:" or "C:filename"
901 if (path.length() >= 2 && path.charAt(1) == ':' && Character.isLetter(path.charAt(0))) {
902 if (path.length() == 2) {
903 path += "\\";
904 } else if (path.charAt(2) != '\\') {
905 path = path.substring(0, 2) + "\\" + path.substring(2);
906 }
907 }
908 return super.createFileObject(path);
909 }
910
911 @SuppressWarnings("serial") // anonymous class
912 protected File createFileSystemRoot(File f) {
913 // Problem: Removable drives on Windows return false on f.exists()
914 // Workaround: Override exists() to always return true.
915 return new FileSystemRoot(f) {
916 public boolean exists() {
917 return true;
918 }
919 };
920 }
921
922 }
923
924 /**
925 * Fallthrough FileSystemView in case we can't determine the OS.
926 */
927 class GenericFileSystemView extends FileSystemView {
928
929 private static final String newFolderString =
930 UIManager.getString("FileChooser.other.newFolder");
931
932 /**
933 * Creates a new folder with a default folder name.
934 */
935 public File createNewFolder(File containingDir) throws IOException {
936 if(containingDir == null) {
937 throw new IOException("Containing directory is null:");
938 }
939 // Using NT's default folder name
940 File newFolder = createFileObject(containingDir, newFolderString);
941
942 if(newFolder.exists()) {
943 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
944 } else {
945 if(!newFolder.mkdirs()) {
946 throw new IOException(newFolder.getAbsolutePath());
947 }
948 }
949 return newFolder;
950 }
951
952 }