1 /*
2 * Copyright (c) 1998, 2017, 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 * 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 * The default implementation gets information from the ShellFolder class.
230 *
231 * @param f a <code>File</code> object
232 * @return an icon as it would be displayed by a native file chooser
233 * @see JFileChooser#getIcon
234 * @since 1.4
235 */
236 public Icon getSystemIcon(File f) {
237 if (f == null) {
238 return null;
239 }
240
241 ShellFolder sf;
242
243 try {
244 sf = getShellFolder(f);
245 } catch (FileNotFoundException e) {
246 return null;
247 }
248
249 Image img = sf.getIcon(false);
250
251 if (img != null) {
252 return new ImageIcon(img, sf.getFolderType());
253 } else {
254 return UIManager.getIcon(f.isDirectory() ? "FileView.directoryIcon" : "FileView.fileIcon");
255 }
256 }
257
258 /**
259 * Icon for a file, directory, or folder as it would be displayed in
260 * a system file browser for the requested size.
261 *
262 * The default implementation gets information from the ShellFolder class.
263 *
264 * @param f a <code>File</code> object
265 * @param size width and height of the icon in pixels to be scaled(valid range: 1 to 256)
266 * @return an icon as it would be displayed by a native file chooser
267 * @see JFileChooser#getIcon
268 * @since 12
269 */
270 protected Icon getSystemIcon(File f, int size) {
271 if (f == null) {
272 return null;
273 }
274
275 if(size > 256 || size < 1) {
276 return null;
277 }
278
279 ShellFolder sf;
280 try {
281 sf = getShellFolder(f);
282 } catch (FileNotFoundException e) {
283 return null;
284 }
285
286 Image img = sf.getIcon(size);
287 if (img != null) {
288 return new ImageIcon(img, sf.getFolderType());
289 } else {
290 return UIManager.getIcon(f.isDirectory() ? "FileView.directoryIcon" : "FileView.fileIcon");
291 }
292 }
293
294 /**
295 * On Windows, a file can appear in multiple folders, other than its
296 * parent directory in the filesystem. Folder could for example be the
297 * "Desktop" folder which is not the same as file.getParentFile().
298 *
299 * @param folder a <code>File</code> object representing a directory or special folder
300 * @param file a <code>File</code> object
301 * @return <code>true</code> if <code>folder</code> is a directory or special folder and contains <code>file</code>.
302 * @since 1.4
303 */
304 public boolean isParent(File folder, File file) {
305 if (folder == null || file == null) {
306 return false;
307 } else if (folder instanceof ShellFolder) {
308 File parent = file.getParentFile();
309 if (parent != null && parent.equals(folder)) {
310 return true;
311 }
312 File[] children = getFiles(folder, false);
313 for (File child : children) {
314 if (file.equals(child)) {
315 return true;
316 }
317 }
318 return false;
319 } else {
320 return folder.equals(file.getParentFile());
321 }
322 }
323
324 /**
325 *
326 * @param parent a <code>File</code> object representing a directory or special folder
327 * @param fileName a name of a file or folder which exists in <code>parent</code>
328 * @return a File object. This is normally constructed with <code>new
329 * File(parent, fileName)</code> except when parent and child are both
330 * special folders, in which case the <code>File</code> is a wrapper containing
331 * a <code>ShellFolder</code> object.
332 * @since 1.4
333 */
334 public File getChild(File parent, String fileName) {
335 if (parent instanceof ShellFolder) {
336 File[] children = getFiles(parent, false);
337 for (File child : children) {
338 if (child.getName().equals(fileName)) {
339 return child;
340 }
341 }
342 }
343 return createFileObject(parent, fileName);
344 }
345
346
347 /**
348 * Checks if <code>f</code> represents a real directory or file as opposed to a
349 * special folder such as <code>"Desktop"</code>. Used by UI classes to decide if
350 * a folder is selectable when doing directory choosing.
351 *
352 * @param f a <code>File</code> object
353 * @return <code>true</code> if <code>f</code> is a real file or directory.
354 * @since 1.4
355 */
356 public boolean isFileSystem(File f) {
357 if (f instanceof ShellFolder) {
358 ShellFolder sf = (ShellFolder)f;
359 // Shortcuts to directories are treated as not being file system objects,
360 // so that they are never returned by JFileChooser.
361 return sf.isFileSystem() && !(sf.isLink() && sf.isDirectory());
362 } else {
363 return true;
364 }
365 }
366
367 /**
368 * Creates a new folder with a default folder name.
369 *
370 * @param containingDir a {@code File} object denoting directory to contain the new folder
371 * @return a {@code File} object denoting the newly created folder
372 * @throws IOException if new folder could not be created
373 */
374 public abstract File createNewFolder(File containingDir) throws IOException;
375
376 /**
377 * Returns whether a file is hidden or not.
378 *
379 * @param f a {@code File} object
380 * @return true if the given {@code File} denotes a hidden file
381 */
382 public boolean isHiddenFile(File f) {
383 return f.isHidden();
384 }
385
386
387 /**
388 * Is dir the root of a tree in the file system, such as a drive
389 * or partition. Example: Returns true for "C:\" on Windows 98.
390 *
391 * @param dir a <code>File</code> object representing a directory
392 * @return <code>true</code> if <code>f</code> is a root of a filesystem
393 * @see #isRoot
394 * @since 1.4
395 */
396 public boolean isFileSystemRoot(File dir) {
397 return ShellFolder.isFileSystemRoot(dir);
398 }
399
400 /**
401 * Used by UI classes to decide whether to display a special icon
402 * for drives or partitions, e.g. a "hard disk" icon.
403 *
404 * The default implementation has no way of knowing, so always returns false.
405 *
406 * @param dir a directory
407 * @return <code>false</code> always
408 * @since 1.4
409 */
410 public boolean isDrive(File dir) {
411 return false;
412 }
413
414 /**
415 * Used by UI classes to decide whether to display a special icon
416 * for a floppy disk. Implies isDrive(dir).
417 *
418 * The default implementation has no way of knowing, so always returns false.
419 *
420 * @param dir a directory
421 * @return <code>false</code> always
422 * @since 1.4
423 */
424 public boolean isFloppyDrive(File dir) {
425 return false;
426 }
427
428 /**
429 * Used by UI classes to decide whether to display a special icon
430 * for a computer node, e.g. "My Computer" or a network server.
431 *
432 * The default implementation has no way of knowing, so always returns false.
433 *
434 * @param dir a directory
435 * @return <code>false</code> always
436 * @since 1.4
437 */
438 public boolean isComputerNode(File dir) {
439 return ShellFolder.isComputerNode(dir);
440 }
441
442
443 /**
444 * Returns all root partitions on this system. For example, on
445 * Windows, this would be the "Desktop" folder, while on DOS this
446 * would be the A: through Z: drives.
447 *
448 * @return an array of {@code File} objects representing all root partitions
449 * on this system
450 */
451 public File[] getRoots() {
452 // Don't cache this array, because filesystem might change
453 File[] roots = (File[])ShellFolder.get("roots");
454
455 for (int i = 0; i < roots.length; i++) {
456 if (isFileSystemRoot(roots[i])) {
457 roots[i] = createFileSystemRoot(roots[i]);
458 }
459 }
460 return roots;
461 }
462
463
464 // Providing default implementations for the remaining methods
465 // because most OS file systems will likely be able to use this
466 // code. If a given OS can't, override these methods in its
467 // implementation.
468
469 /**
470 * Returns the home directory.
471 * @return the home directory
472 */
473 public File getHomeDirectory() {
474 return createFileObject(System.getProperty("user.home"));
475 }
476
477 /**
478 * Return the user's default starting directory for the file chooser.
479 *
480 * @return a <code>File</code> object representing the default
481 * starting folder
482 * @since 1.4
483 */
484 public File getDefaultDirectory() {
485 File f = (File)ShellFolder.get("fileChooserDefaultFolder");
486 if (isFileSystemRoot(f)) {
487 f = createFileSystemRoot(f);
488 }
489 return f;
490 }
491
492 /**
493 * Returns a File object constructed in dir from the given filename.
494 *
495 * @param dir an abstract pathname denoting a directory
496 * @param filename a {@code String} representation of a pathname
497 * @return a {@code File} object created from {@code dir} and {@code filename}
498 */
499 public File createFileObject(File dir, String filename) {
500 if(dir == null) {
501 return new File(filename);
502 } else {
503 return new File(dir, filename);
504 }
505 }
506
507 /**
508 * Returns a File object constructed from the given path string.
509 *
510 * @param path {@code String} representation of path
511 * @return a {@code File} object created from the given {@code path}
512 */
513 public File createFileObject(String path) {
514 File f = new File(path);
515 if (isFileSystemRoot(f)) {
516 f = createFileSystemRoot(f);
517 }
518 return f;
519 }
520
521
522 /**
523 * Gets the list of shown (i.e. not hidden) files.
524 *
525 * @param dir the root directory of files to be returned
526 * @param useFileHiding determine if hidden files are returned
527 * @return an array of {@code File} objects representing files and
528 * directories in the given {@code dir}. It includes hidden
529 * files if {@code useFileHiding} is false.
530 */
531 public File[] getFiles(File dir, boolean useFileHiding) {
532 List<File> files = new ArrayList<File>();
533
534 // add all files in dir
535 if (!(dir instanceof ShellFolder)) {
536 try {
537 dir = getShellFolder(dir);
538 } catch (FileNotFoundException e) {
539 return new File[0];
540 }
541 }
542
543 File[] names = ((ShellFolder) dir).listFiles(!useFileHiding);
544
545 if (names == null) {
546 return new File[0];
547 }
548
549 for (File f : names) {
550 if (Thread.currentThread().isInterrupted()) {
551 break;
552 }
553
554 if (!(f instanceof ShellFolder)) {
555 if (isFileSystemRoot(f)) {
556 f = createFileSystemRoot(f);
557 }
558 try {
559 f = ShellFolder.getShellFolder(f);
560 } catch (FileNotFoundException e) {
561 // Not a valid file (wouldn't show in native file chooser)
562 // Example: C:\pagefile.sys
563 continue;
564 } catch (InternalError e) {
565 // Not a valid file (wouldn't show in native file chooser)
566 // Example C:\Winnt\Profiles\joe\history\History.IE5
567 continue;
568 }
569 }
570 if (!useFileHiding || !isHiddenFile(f)) {
571 files.add(f);
572 }
573 }
574
575 return files.toArray(new File[files.size()]);
576 }
577
578
579
580 /**
581 * Returns the parent directory of <code>dir</code>.
582 * @param dir the <code>File</code> being queried
583 * @return the parent directory of <code>dir</code>, or
584 * <code>null</code> if <code>dir</code> is <code>null</code>
585 */
586 public File getParentDirectory(File dir) {
587 if (dir == null || !dir.exists()) {
588 return null;
589 }
590
591 ShellFolder sf;
592
593 try {
594 sf = getShellFolder(dir);
595 } catch (FileNotFoundException e) {
596 return null;
597 }
598
599 File psf = sf.getParentFile();
600
601 if (psf == null) {
602 return null;
603 }
604
605 if (isFileSystem(psf)) {
606 File f = psf;
607 if (!f.exists()) {
608 // This could be a node under "Network Neighborhood".
609 File ppsf = psf.getParentFile();
610 if (ppsf == null || !isFileSystem(ppsf)) {
611 // We're mostly after the exists() override for windows below.
612 f = createFileSystemRoot(f);
613 }
614 }
615 return f;
616 } else {
617 return psf;
618 }
619 }
620
621 /**
622 * Returns an array of files representing the values to show by default in
623 * the file chooser selector.
624 *
625 * @return an array of {@code File} objects.
626 * @throws SecurityException if the caller does not have necessary
627 * permissions
628 * @since 9
629 */
630 public File[] getChooserComboBoxFiles() {
631 return (File[]) ShellFolder.get("fileChooserComboBoxFolders");
632 }
633
634 /**
635 * Returns whether the specified file denotes a shell interpreted link which
636 * can be obtained by the {@link #getLinkLocation(File)}.
637 *
638 * @param file a file
639 * @return whether this is a link
640 * @throws NullPointerException if {@code file} equals {@code null}
641 * @throws SecurityException if the caller does not have necessary
642 * permissions
643 * @see #getLinkLocation(File)
644 * @since 9
645 */
646 public boolean isLink(File file) {
647 if (file == null) {
648 throw new NullPointerException("file is null");
649 }
650 try {
651 return ShellFolder.getShellFolder(file).isLink();
652 } catch (FileNotFoundException e) {
653 return false;
654 }
655 }
656
657 /**
658 * Returns the regular file referenced by the specified link file if
659 * the specified file is a shell interpreted link.
660 * Returns {@code null} if the specified file is not
661 * a shell interpreted link.
662 *
663 * @param file a file
664 * @return the linked file or {@code null}.
665 * @throws FileNotFoundException if the linked file does not exist
666 * @throws NullPointerException if {@code file} equals {@code null}
667 * @throws SecurityException if the caller does not have necessary
668 * permissions
669 * @since 9
670 */
671 public File getLinkLocation(File file) throws FileNotFoundException {
672 if (file == null) {
673 throw new NullPointerException("file is null");
674 }
675 ShellFolder shellFolder;
676 try {
677 shellFolder = ShellFolder.getShellFolder(file);
678 } catch (FileNotFoundException e) {
679 return null;
680 }
681 return shellFolder.isLink() ? shellFolder.getLinkLocation() : null;
682 }
683
684 /**
685 * Throws {@code FileNotFoundException} if file not found or current thread was interrupted
686 */
687 ShellFolder getShellFolder(File f) throws FileNotFoundException {
688 if (!(f instanceof ShellFolder) && !(f instanceof FileSystemRoot) && isFileSystemRoot(f)) {
689 f = createFileSystemRoot(f);
690 }
691
692 try {
693 return ShellFolder.getShellFolder(f);
694 } catch (InternalError e) {
695 System.err.println("FileSystemView.getShellFolder: f="+f);
696 e.printStackTrace();
697 return null;
698 }
699 }
700
701 /**
702 * Creates a new <code>File</code> object for <code>f</code> with correct
703 * behavior for a file system root directory.
704 *
705 * @param f a <code>File</code> object representing a file system root
706 * directory, for example "/" on Unix or "C:\" on Windows.
707 * @return a new <code>File</code> object
708 * @since 1.4
709 */
710 protected File createFileSystemRoot(File f) {
711 return new FileSystemRoot(f);
712 }
713
714 @SuppressWarnings("serial") // Same-version serialization only
715 static class FileSystemRoot extends File {
716 public FileSystemRoot(File f) {
717 super(f,"");
718 }
719
720 public FileSystemRoot(String s) {
721 super(s);
722 }
723
724 public boolean isDirectory() {
725 return true;
726 }
727
728 public String getName() {
729 return getPath();
730 }
731 }
732 }
733
734 /**
735 * FileSystemView that handles some specific unix-isms.
736 */
737 class UnixFileSystemView extends FileSystemView {
738
739 private static final String newFolderString =
740 UIManager.getString("FileChooser.other.newFolder");
741 private static final String newFolderNextString =
742 UIManager.getString("FileChooser.other.newFolder.subsequent");
743
744 /**
745 * Creates a new folder with a default folder name.
746 */
747 public File createNewFolder(File containingDir) throws IOException {
748 if(containingDir == null) {
749 throw new IOException("Containing directory is null:");
750 }
751 File newFolder;
752 // Unix - using OpenWindows' default folder name. Can't find one for Motif/CDE.
753 newFolder = createFileObject(containingDir, newFolderString);
754 int i = 1;
755 while (newFolder.exists() && i < 100) {
756 newFolder = createFileObject(containingDir, MessageFormat.format(
757 newFolderNextString, i));
758 i++;
759 }
760
761 if(newFolder.exists()) {
762 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
763 } else {
764 if(!newFolder.mkdirs()) {
765 throw new IOException(newFolder.getAbsolutePath());
766 }
767 }
768
769 return newFolder;
770 }
771
772 public boolean isFileSystemRoot(File dir) {
773 return dir != null && dir.getAbsolutePath().equals("/");
774 }
775
776 public boolean isDrive(File dir) {
777 return isFloppyDrive(dir);
778 }
779
780 public boolean isFloppyDrive(File dir) {
781 // Could be looking at the path for Solaris, but wouldn't be reliable.
782 // For example:
783 // return (dir != null && dir.getAbsolutePath().toLowerCase().startsWith("/floppy"));
784 return false;
785 }
786
787 public boolean isComputerNode(File dir) {
788 if (dir != null) {
789 String parent = dir.getParent();
790 if (parent != null && parent.equals("/net")) {
791 return true;
792 }
793 }
794 return false;
795 }
796 }
797
798
799 /**
800 * FileSystemView that handles some specific windows concepts.
801 */
802 class WindowsFileSystemView extends FileSystemView {
803
804 private static final String newFolderString =
805 UIManager.getString("FileChooser.win32.newFolder");
806 private static final String newFolderNextString =
807 UIManager.getString("FileChooser.win32.newFolder.subsequent");
808
809 public Boolean isTraversable(File f) {
810 return Boolean.valueOf(isFileSystemRoot(f) || isComputerNode(f) || f.isDirectory());
811 }
812
813 public File getChild(File parent, String fileName) {
814 if (fileName.startsWith("\\")
815 && !fileName.startsWith("\\\\")
816 && isFileSystem(parent)) {
817
818 //Path is relative to the root of parent's drive
819 String path = parent.getAbsolutePath();
820 if (path.length() >= 2
821 && path.charAt(1) == ':'
822 && Character.isLetter(path.charAt(0))) {
823
824 return createFileObject(path.substring(0, 2) + fileName);
825 }
826 }
827 return super.getChild(parent, fileName);
828 }
829
830 /**
831 * Type description for a file, directory, or folder as it would be displayed in
832 * a system file browser. Example from Windows: the "Desktop" folder
833 * is described as "Desktop".
834 *
835 * The Windows implementation gets information from the ShellFolder class.
836 */
837 public String getSystemTypeDescription(File f) {
838 if (f == null) {
839 return null;
840 }
841
842 try {
843 return getShellFolder(f).getFolderType();
844 } catch (FileNotFoundException e) {
845 return null;
846 }
847 }
848
849 /**
850 * @return the Desktop folder.
851 */
852 public File getHomeDirectory() {
853 File[] roots = getRoots();
854 return (roots.length == 0) ? null : roots[0];
855 }
856
857 /**
858 * Creates a new folder with a default folder name.
859 */
860 public File createNewFolder(File containingDir) throws IOException {
861 if(containingDir == null) {
862 throw new IOException("Containing directory is null:");
863 }
864 // Using NT's default folder name
865 File newFolder = createFileObject(containingDir, newFolderString);
866 int i = 2;
867 while (newFolder.exists() && i < 100) {
868 newFolder = createFileObject(containingDir, MessageFormat.format(
869 newFolderNextString, i));
870 i++;
871 }
872
873 if(newFolder.exists()) {
874 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
875 } else {
876 if(!newFolder.mkdirs()) {
877 throw new IOException(newFolder.getAbsolutePath());
878 }
879 }
880
881 return newFolder;
882 }
883
884 public boolean isDrive(File dir) {
885 return isFileSystemRoot(dir);
886 }
887
888 public boolean isFloppyDrive(final File dir) {
889 String path = AccessController.doPrivileged(new PrivilegedAction<String>() {
890 public String run() {
891 return dir.getAbsolutePath();
892 }
893 });
894
895 return path != null && (path.equals("A:\\") || path.equals("B:\\"));
896 }
897
898 /**
899 * Returns a File object constructed from the given path string.
900 */
901 public File createFileObject(String path) {
902 // Check for missing backslash after drive letter such as "C:" or "C:filename"
903 if (path.length() >= 2 && path.charAt(1) == ':' && Character.isLetter(path.charAt(0))) {
904 if (path.length() == 2) {
905 path += "\\";
906 } else if (path.charAt(2) != '\\') {
907 path = path.substring(0, 2) + "\\" + path.substring(2);
908 }
909 }
910 return super.createFileObject(path);
911 }
912
913 @SuppressWarnings("serial") // anonymous class
914 protected File createFileSystemRoot(File f) {
915 // Problem: Removable drives on Windows return false on f.exists()
916 // Workaround: Override exists() to always return true.
917 return new FileSystemRoot(f) {
918 public boolean exists() {
919 return true;
920 }
921 };
922 }
923
924 }
925
926 /**
927 * Fallthrough FileSystemView in case we can't determine the OS.
928 */
929 class GenericFileSystemView extends FileSystemView {
930
931 private static final String newFolderString =
932 UIManager.getString("FileChooser.other.newFolder");
933
934 /**
935 * Creates a new folder with a default folder name.
936 */
937 public File createNewFolder(File containingDir) throws IOException {
938 if(containingDir == null) {
939 throw new IOException("Containing directory is null:");
940 }
941 // Using NT's default folder name
942 File newFolder = createFileObject(containingDir, newFolderString);
943
944 if(newFolder.exists()) {
945 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
946 } else {
947 if(!newFolder.mkdirs()) {
948 throw new IOException(newFolder.getAbsolutePath());
949 }
950 }
951 return newFolder;
952 }
953
954 }