1 /*
2 * Copyright (c) 1998, 2016, 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
29 import javax.swing.*;
30
31 import java.awt.Image;
32 import java.io.File;
33 import java.io.FileNotFoundException;
34 import java.io.IOException;
35 import java.text.MessageFormat;
36 import java.util.List;
37 import java.util.ArrayList;
38 import java.lang.ref.WeakReference;
39 import java.beans.PropertyChangeListener;
40 import java.beans.PropertyChangeEvent;
41 import java.security.AccessController;
42 import java.security.PrivilegedAction;
43
44 import sun.awt.shell.*;
45
46 /**
47 * FileSystemView is JFileChooser's gateway to the
48 * file system. Since the JDK1.1 File API doesn't allow
49 * access to such information as root partitions, file type
50 * information, or hidden file bits, this class is designed
51 * to intuit as much OS-specific file system information as
52 * possible.
53 *
54 * <p>
55 *
56 * Java Licensees may want to provide a different implementation of
57 * FileSystemView to better handle a given operating system.
58 *
59 * @author Jeff Dinkins
60 */
61
62 // PENDING(jeff) - need to provide a specification for
63 // how Mac/OS2/BeOS/etc file systems can modify FileSystemView
64 // to handle their particular type of file system.
65
66 public abstract class FileSystemView {
67
68 static FileSystemView windowsFileSystemView = null;
69 static FileSystemView unixFileSystemView = null;
70 //static FileSystemView macFileSystemView = null;
71 static FileSystemView genericFileSystemView = null;
72
73 private boolean useSystemExtensionHiding =
74 UIManager.getDefaults().getBoolean("FileChooser.useSystemExtensionHiding");
75
76 /**
77 * An icon image query option that requests the small file icon.
78 *
79 * @since 10
80 */
81 public static final int FILE_ICON_SMALL = -1;
82
83 /**
84 * An icon image query option that requests the large file icon.
85 *
86 * @since 10
87 */
88 public static final int FILE_ICON_LARGE = -2;
89
90 /**
91 * Returns the file system view.
92 * @return the file system view
93 */
94 public static FileSystemView getFileSystemView() {
95 if(File.separatorChar == '\\') {
96 if(windowsFileSystemView == null) {
97 windowsFileSystemView = new WindowsFileSystemView();
98 }
99 return windowsFileSystemView;
100 }
101
102 if(File.separatorChar == '/') {
103 if(unixFileSystemView == null) {
104 unixFileSystemView = new UnixFileSystemView();
105 }
106 return unixFileSystemView;
107 }
108
109 // if(File.separatorChar == ':') {
110 // if(macFileSystemView == null) {
111 // macFileSystemView = new MacFileSystemView();
112 // }
113 // return macFileSystemView;
114 //}
115
116 if(genericFileSystemView == null) {
117 genericFileSystemView = new GenericFileSystemView();
118 }
119 return genericFileSystemView;
120 }
121
122 /**
123 * Constructs a FileSystemView.
124 */
125 public FileSystemView() {
126 final WeakReference<FileSystemView> weakReference = new WeakReference<FileSystemView>(this);
127
128 UIManager.addPropertyChangeListener(new PropertyChangeListener() {
129 public void propertyChange(PropertyChangeEvent evt) {
130 FileSystemView fileSystemView = weakReference.get();
131
132 if (fileSystemView == null) {
133 // FileSystemView was destroyed
134 UIManager.removePropertyChangeListener(this);
135 } else {
136 if (evt.getPropertyName().equals("lookAndFeel")) {
137 fileSystemView.useSystemExtensionHiding =
138 UIManager.getDefaults().getBoolean("FileChooser.useSystemExtensionHiding");
139 }
140 }
141 }
142 });
143 }
144
145 /**
146 * Determines if the given file is a root in the navigable tree(s).
147 * Examples: Windows 98 has one root, the Desktop folder. DOS has one root
148 * per drive letter, <code>C:\</code>, <code>D:\</code>, etc. Unix has one root,
149 * the <code>"/"</code> directory.
150 *
151 * The default implementation gets information from the <code>ShellFolder</code> class.
152 *
153 * @param f a <code>File</code> object representing a directory
154 * @return <code>true</code> if <code>f</code> is a root in the navigable tree.
155 * @see #isFileSystemRoot
156 */
157 public boolean isRoot(File f) {
158 if (f == null || !f.isAbsolute()) {
159 return false;
160 }
161
162 File[] roots = getRoots();
163 for (File root : roots) {
164 if (root.equals(f)) {
165 return true;
166 }
167 }
168 return false;
169 }
170
171 /**
172 * Returns true if the file (directory) can be visited.
173 * Returns false if the directory cannot be traversed.
174 *
175 * @param f the <code>File</code>
176 * @return <code>true</code> if the file/directory can be traversed, otherwise <code>false</code>
177 * @see JFileChooser#isTraversable
178 * @see FileView#isTraversable
179 * @since 1.4
180 */
181 public Boolean isTraversable(File f) {
182 return Boolean.valueOf(f.isDirectory());
183 }
184
185 /**
186 * Name of a file, directory, or folder as it would be displayed in
187 * a system file browser. Example from Windows: the "M:\" directory
188 * displays as "CD-ROM (M:)"
189 *
190 * The default implementation gets information from the ShellFolder class.
191 *
192 * @param f a <code>File</code> object
193 * @return the file name as it would be displayed by a native file chooser
194 * @see JFileChooser#getName
195 * @since 1.4
196 */
197 public String getSystemDisplayName(File f) {
198 if (f == null) {
199 return null;
200 }
201
202 String name = f.getName();
203
204 if (!name.equals("..") && !name.equals(".") &&
205 (useSystemExtensionHiding || !isFileSystem(f) || isFileSystemRoot(f)) &&
206 (f instanceof ShellFolder || f.exists())) {
207
208 try {
209 name = getShellFolder(f).getDisplayName();
210 } catch (FileNotFoundException e) {
211 return null;
212 }
213
214 if (name == null || name.length() == 0) {
215 name = f.getPath(); // e.g. "/"
216 }
217 }
218
219 return name;
220 }
221
222 /**
223 * Type description for a file, directory, or folder as it would be displayed in
224 * a system file browser. Example from Windows: the "Desktop" folder
225 * is described as "Desktop".
226 *
227 * Override for platforms with native ShellFolder implementations.
228 *
229 * @param f a <code>File</code> object
230 * @return the file type description as it would be displayed by a native file chooser
231 * or null if no native information is available.
232 * @see JFileChooser#getTypeDescription
233 * @since 1.4
234 */
235 public String getSystemTypeDescription(File f) {
236 return null;
237 }
238
239 /**
240 * Icon for a file, directory, or folder as it would be displayed in
241 * a system file browser. Example from Windows: the "M:\" directory
242 * displays a CD-ROM icon.
243 *
244 * The default implementation gets information from the ShellFolder class.
245 *
246 * @param f a <code>File</code> object
247 * @return an icon as it would be displayed by a native file chooser
248 * @see JFileChooser#getIcon
249 * @since 1.4
250 */
251 public Icon getSystemIcon(File f) {
252 if (f == null) {
253 return null;
254 }
255
256 ShellFolder sf;
257
258 try {
259 sf = getShellFolder(f);
260 } catch (FileNotFoundException e) {
261 return null;
262 }
263
264 Image img = sf.getIcon(false);
265
266 if (img != null) {
267 return new ImageIcon(img, sf.getFolderType());
268 } else {
269 return UIManager.getIcon(f.isDirectory() ? "FileView.directoryIcon" : "FileView.fileIcon");
270 }
271 }
272
273 /**
274 * Returns icon image if it is associated with the specified file or
275 * {@code null} otherwise. Depending on the passed {@code size} different
276 * sizes of file icon may be queried. If value of the {@code size} argument
277 * equals to {@code #FILE_ICON_SMALL} or {@code #FILE_ICON_LARGE} then
278 * the small or large file icon variant is returned correspondingly.
279 * For any positive size value the exact file icon size is queried.
280 *
281 * @param file a file
282 * @param size size to query
283 * @return file icon
284 * @throws NullPointerException if {@code file} equals {@code null}
285 * @see #FILE_ICON_SMALL
286 * @see #FILE_ICON_LARGE
287 * @since 10
288 */
289 public ImageIcon getSystemIcon(File file, int size) {
290 if (file == null) {
291 throw new NullPointerException("file is null");
292 }
293 ShellFolder sf;
294 try {
295 sf = ShellFolder.getShellFolder(file);
296 } catch (FileNotFoundException e) {
297 return null;
298 }
299 Image img = null;
300 if (size == FILE_ICON_SMALL) {
301 img = sf.getIcon(false);
302 } else if (size == FILE_ICON_LARGE) {
303 img = sf.getIcon(true);
304 } else if (size > 0) {
305 img = sf.getIcon(size);
306 } else {
307 throw new IllegalArgumentException("Wrong size value +" + size);
308 }
309 if (img != null) {
310 return new ImageIcon(img, sf.getFolderType());
311 }
312 return null;
313 }
314
315 /**
316 * On Windows, a file can appear in multiple folders, other than its
317 * parent directory in the filesystem. Folder could for example be the
318 * "Desktop" folder which is not the same as file.getParentFile().
319 *
320 * @param folder a <code>File</code> object representing a directory or special folder
321 * @param file a <code>File</code> object
322 * @return <code>true</code> if <code>folder</code> is a directory or special folder and contains <code>file</code>.
323 * @since 1.4
324 */
325 public boolean isParent(File folder, File file) {
326 if (folder == null || file == null) {
327 return false;
328 } else if (folder instanceof ShellFolder) {
329 File parent = file.getParentFile();
330 if (parent != null && parent.equals(folder)) {
331 return true;
332 }
333 File[] children = getFiles(folder, false);
334 for (File child : children) {
335 if (file.equals(child)) {
336 return true;
337 }
338 }
339 return false;
340 } else {
341 return folder.equals(file.getParentFile());
342 }
343 }
344
345 /**
346 *
347 * @param parent a <code>File</code> object representing a directory or special folder
348 * @param fileName a name of a file or folder which exists in <code>parent</code>
349 * @return a File object. This is normally constructed with <code>new
350 * File(parent, fileName)</code> except when parent and child are both
351 * special folders, in which case the <code>File</code> is a wrapper containing
352 * a <code>ShellFolder</code> object.
353 * @since 1.4
354 */
355 public File getChild(File parent, String fileName) {
356 if (parent instanceof ShellFolder) {
357 File[] children = getFiles(parent, false);
358 for (File child : children) {
359 if (child.getName().equals(fileName)) {
360 return child;
361 }
362 }
363 }
364 return createFileObject(parent, fileName);
365 }
366
367
368 /**
369 * Checks if <code>f</code> represents a real directory or file as opposed to a
370 * special folder such as <code>"Desktop"</code>. Used by UI classes to decide if
371 * a folder is selectable when doing directory choosing.
372 *
373 * @param f a <code>File</code> object
374 * @return <code>true</code> if <code>f</code> is a real file or directory.
375 * @since 1.4
376 */
377 public boolean isFileSystem(File f) {
378 if (f instanceof ShellFolder) {
379 ShellFolder sf = (ShellFolder)f;
380 // Shortcuts to directories are treated as not being file system objects,
381 // so that they are never returned by JFileChooser.
382 return sf.isFileSystem() && !(sf.isLink() && sf.isDirectory());
383 } else {
384 return true;
385 }
386 }
387
388 /**
389 * Creates a new folder with a default folder name.
390 *
391 * @param containingDir a {@code File} object denoting directory to contain the new folder
392 * @return a {@code File} object denoting the newly created folder
393 * @throws IOException if new folder could not be created
394 */
395 public abstract File createNewFolder(File containingDir) throws IOException;
396
397 /**
398 * Returns whether a file is hidden or not.
399 *
400 * @param f a {@code File} object
401 * @return true if the given {@code File} denotes a hidden file
402 */
403 public boolean isHiddenFile(File f) {
404 return f.isHidden();
405 }
406
407
408 /**
409 * Is dir the root of a tree in the file system, such as a drive
410 * or partition. Example: Returns true for "C:\" on Windows 98.
411 *
412 * @param dir a <code>File</code> object representing a directory
413 * @return <code>true</code> if <code>f</code> is a root of a filesystem
414 * @see #isRoot
415 * @since 1.4
416 */
417 public boolean isFileSystemRoot(File dir) {
418 return ShellFolder.isFileSystemRoot(dir);
419 }
420
421 /**
422 * Used by UI classes to decide whether to display a special icon
423 * for drives or partitions, e.g. a "hard disk" icon.
424 *
425 * The default implementation has no way of knowing, so always returns false.
426 *
427 * @param dir a directory
428 * @return <code>false</code> always
429 * @since 1.4
430 */
431 public boolean isDrive(File dir) {
432 return false;
433 }
434
435 /**
436 * Used by UI classes to decide whether to display a special icon
437 * for a floppy disk. Implies isDrive(dir).
438 *
439 * The default implementation has no way of knowing, so always returns false.
440 *
441 * @param dir a directory
442 * @return <code>false</code> always
443 * @since 1.4
444 */
445 public boolean isFloppyDrive(File dir) {
446 return false;
447 }
448
449 /**
450 * Used by UI classes to decide whether to display a special icon
451 * for a computer node, e.g. "My Computer" or a network server.
452 *
453 * The default implementation has no way of knowing, so always returns false.
454 *
455 * @param dir a directory
456 * @return <code>false</code> always
457 * @since 1.4
458 */
459 public boolean isComputerNode(File dir) {
460 return ShellFolder.isComputerNode(dir);
461 }
462
463
464 /**
465 * Returns all root partitions on this system. For example, on
466 * Windows, this would be the "Desktop" folder, while on DOS this
467 * would be the A: through Z: drives.
468 *
469 * @return an array of {@code File} objects representing all root partitions
470 * on this system
471 */
472 public File[] getRoots() {
473 // Don't cache this array, because filesystem might change
474 File[] roots = (File[])ShellFolder.get("roots");
475
476 for (int i = 0; i < roots.length; i++) {
477 if (isFileSystemRoot(roots[i])) {
478 roots[i] = createFileSystemRoot(roots[i]);
479 }
480 }
481 return roots;
482 }
483
484
485 // Providing default implementations for the remaining methods
486 // because most OS file systems will likely be able to use this
487 // code. If a given OS can't, override these methods in its
488 // implementation.
489
490 /**
491 * Returns the home directory.
492 * @return the home directory
493 */
494 public File getHomeDirectory() {
495 return createFileObject(System.getProperty("user.home"));
496 }
497
498 /**
499 * Return the user's default starting directory for the file chooser.
500 *
501 * @return a <code>File</code> object representing the default
502 * starting folder
503 * @since 1.4
504 */
505 public File getDefaultDirectory() {
506 File f = (File)ShellFolder.get("fileChooserDefaultFolder");
507 if (isFileSystemRoot(f)) {
508 f = createFileSystemRoot(f);
509 }
510 return f;
511 }
512
513 /**
514 * Returns a File object constructed in dir from the given filename.
515 *
516 * @param dir an abstract pathname denoting a directory
517 * @param filename a {@code String} representation of a pathname
518 * @return a {@code File} object created from {@code dir} and {@code filename}
519 */
520 public File createFileObject(File dir, String filename) {
521 if(dir == null) {
522 return new File(filename);
523 } else {
524 return new File(dir, filename);
525 }
526 }
527
528 /**
529 * Returns a File object constructed from the given path string.
530 *
531 * @param path {@code String} representation of path
532 * @return a {@code File} object created from the given {@code path}
533 */
534 public File createFileObject(String path) {
535 File f = new File(path);
536 if (isFileSystemRoot(f)) {
537 f = createFileSystemRoot(f);
538 }
539 return f;
540 }
541
542
543 /**
544 * Gets the list of shown (i.e. not hidden) files.
545 *
546 * @param dir the root directory of files to be returned
547 * @param useFileHiding determine if hidden files are returned
548 * @return an array of {@code File} objects representing files and
549 * directories in the given {@code dir}. It includes hidden
550 * files if {@code useFileHiding} is false.
551 */
552 public File[] getFiles(File dir, boolean useFileHiding) {
553 List<File> files = new ArrayList<File>();
554
555 // add all files in dir
556 if (!(dir instanceof ShellFolder)) {
557 try {
558 dir = getShellFolder(dir);
559 } catch (FileNotFoundException e) {
560 return new File[0];
561 }
562 }
563
564 File[] names = ((ShellFolder) dir).listFiles(!useFileHiding);
565
566 if (names == null) {
567 return new File[0];
568 }
569
570 for (File f : names) {
571 if (Thread.currentThread().isInterrupted()) {
572 break;
573 }
574
575 if (!(f instanceof ShellFolder)) {
576 if (isFileSystemRoot(f)) {
577 f = createFileSystemRoot(f);
578 }
579 try {
580 f = ShellFolder.getShellFolder(f);
581 } catch (FileNotFoundException e) {
582 // Not a valid file (wouldn't show in native file chooser)
583 // Example: C:\pagefile.sys
584 continue;
585 } catch (InternalError e) {
586 // Not a valid file (wouldn't show in native file chooser)
587 // Example C:\Winnt\Profiles\joe\history\History.IE5
588 continue;
589 }
590 }
591 if (!useFileHiding || !isHiddenFile(f)) {
592 files.add(f);
593 }
594 }
595
596 return files.toArray(new File[files.size()]);
597 }
598
599
600
601 /**
602 * Returns the parent directory of <code>dir</code>.
603 * @param dir the <code>File</code> being queried
604 * @return the parent directory of <code>dir</code>, or
605 * <code>null</code> if <code>dir</code> is <code>null</code>
606 */
607 public File getParentDirectory(File dir) {
608 if (dir == null || !dir.exists()) {
609 return null;
610 }
611
612 ShellFolder sf;
613
614 try {
615 sf = getShellFolder(dir);
616 } catch (FileNotFoundException e) {
617 return null;
618 }
619
620 File psf = sf.getParentFile();
621
622 if (psf == null) {
623 return null;
624 }
625
626 if (isFileSystem(psf)) {
627 File f = psf;
628 if (!f.exists()) {
629 // This could be a node under "Network Neighborhood".
630 File ppsf = psf.getParentFile();
631 if (ppsf == null || !isFileSystem(ppsf)) {
632 // We're mostly after the exists() override for windows below.
633 f = createFileSystemRoot(f);
634 }
635 }
636 return f;
637 } else {
638 return psf;
639 }
640 }
641
642 /**
643 * Returns an array of files representing the values to show by default in
644 * the file chooser selector.
645 *
646 * @return an array of {@code File} objects.
647 * @throws SecurityException if the caller does not have necessary
648 * permissions
649 * @since 9
650 */
651 public File[] getChooserComboBoxFiles() {
652 return (File[]) ShellFolder.get("fileChooserComboBoxFolders");
653 }
654
655 /**
656 * Returns whether the specified file denotes a shell interpreted link which
657 * can be obtained by the {@link #getLinkLocation(File)}.
658 *
659 * @param file a file
660 * @return whether this is a link
661 * @throws NullPointerException if {@code file} equals {@code null}
662 * @throws SecurityException if the caller does not have necessary
663 * permissions
664 * @see #getLinkLocation(File)
665 * @since 9
666 */
667 public boolean isLink(File file) {
668 if (file == null) {
669 throw new NullPointerException("file is null");
670 }
671 try {
672 return ShellFolder.getShellFolder(file).isLink();
673 } catch (FileNotFoundException e) {
674 return false;
675 }
676 }
677
678 /**
679 * Returns the regular file referenced by the specified link file if
680 * the specified file is a shell interpreted link.
681 * Returns {@code null} if the specified file is not
682 * a shell interpreted link.
683 *
684 * @param file a file
685 * @return the linked file or {@code null}.
686 * @throws FileNotFoundException if the linked file does not exist
687 * @throws NullPointerException if {@code file} equals {@code null}
688 * @throws SecurityException if the caller does not have necessary
689 * permissions
690 * @since 9
691 */
692 public File getLinkLocation(File file) throws FileNotFoundException {
693 if (file == null) {
694 throw new NullPointerException("file is null");
695 }
696 ShellFolder shellFolder;
697 try {
698 shellFolder = ShellFolder.getShellFolder(file);
699 } catch (FileNotFoundException e) {
700 return null;
701 }
702 return shellFolder.isLink() ? shellFolder.getLinkLocation() : null;
703 }
704
705 /**
706 * Throws {@code FileNotFoundException} if file not found or current thread was interrupted
707 */
708 ShellFolder getShellFolder(File f) throws FileNotFoundException {
709 if (!(f instanceof ShellFolder) && !(f instanceof FileSystemRoot) && isFileSystemRoot(f)) {
710 f = createFileSystemRoot(f);
711 }
712
713 try {
714 return ShellFolder.getShellFolder(f);
715 } catch (InternalError e) {
716 System.err.println("FileSystemView.getShellFolder: f="+f);
717 e.printStackTrace();
718 return null;
719 }
720 }
721
722 /**
723 * Creates a new <code>File</code> object for <code>f</code> with correct
724 * behavior for a file system root directory.
725 *
726 * @param f a <code>File</code> object representing a file system root
727 * directory, for example "/" on Unix or "C:\" on Windows.
728 * @return a new <code>File</code> object
729 * @since 1.4
730 */
731 protected File createFileSystemRoot(File f) {
732 return new FileSystemRoot(f);
733 }
734
735 @SuppressWarnings("serial") // Same-version serialization only
736 static class FileSystemRoot extends File {
737 public FileSystemRoot(File f) {
738 super(f,"");
739 }
740
741 public FileSystemRoot(String s) {
742 super(s);
743 }
744
745 public boolean isDirectory() {
746 return true;
747 }
748
749 public String getName() {
750 return getPath();
751 }
752 }
753 }
754
755 /**
756 * FileSystemView that handles some specific unix-isms.
757 */
758 class UnixFileSystemView extends FileSystemView {
759
760 private static final String newFolderString =
761 UIManager.getString("FileChooser.other.newFolder");
762 private static final String newFolderNextString =
763 UIManager.getString("FileChooser.other.newFolder.subsequent");
764
765 /**
766 * Creates a new folder with a default folder name.
767 */
768 public File createNewFolder(File containingDir) throws IOException {
769 if(containingDir == null) {
770 throw new IOException("Containing directory is null:");
771 }
772 File newFolder;
773 // Unix - using OpenWindows' default folder name. Can't find one for Motif/CDE.
774 newFolder = createFileObject(containingDir, newFolderString);
775 int i = 1;
776 while (newFolder.exists() && i < 100) {
777 newFolder = createFileObject(containingDir, MessageFormat.format(
778 newFolderNextString, i));
779 i++;
780 }
781
782 if(newFolder.exists()) {
783 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
784 } else {
785 if(!newFolder.mkdirs()) {
786 throw new IOException(newFolder.getAbsolutePath());
787 }
788 }
789
790 return newFolder;
791 }
792
793 public boolean isFileSystemRoot(File dir) {
794 return dir != null && dir.getAbsolutePath().equals("/");
795 }
796
797 public boolean isDrive(File dir) {
798 return isFloppyDrive(dir);
799 }
800
801 public boolean isFloppyDrive(File dir) {
802 // Could be looking at the path for Solaris, but wouldn't be reliable.
803 // For example:
804 // return (dir != null && dir.getAbsolutePath().toLowerCase().startsWith("/floppy"));
805 return false;
806 }
807
808 public boolean isComputerNode(File dir) {
809 if (dir != null) {
810 String parent = dir.getParent();
811 if (parent != null && parent.equals("/net")) {
812 return true;
813 }
814 }
815 return false;
816 }
817 }
818
819
820 /**
821 * FileSystemView that handles some specific windows concepts.
822 */
823 class WindowsFileSystemView extends FileSystemView {
824
825 private static final String newFolderString =
826 UIManager.getString("FileChooser.win32.newFolder");
827 private static final String newFolderNextString =
828 UIManager.getString("FileChooser.win32.newFolder.subsequent");
829
830 public Boolean isTraversable(File f) {
831 return Boolean.valueOf(isFileSystemRoot(f) || isComputerNode(f) || f.isDirectory());
832 }
833
834 public File getChild(File parent, String fileName) {
835 if (fileName.startsWith("\\")
836 && !fileName.startsWith("\\\\")
837 && isFileSystem(parent)) {
838
839 //Path is relative to the root of parent's drive
840 String path = parent.getAbsolutePath();
841 if (path.length() >= 2
842 && path.charAt(1) == ':'
843 && Character.isLetter(path.charAt(0))) {
844
845 return createFileObject(path.substring(0, 2) + fileName);
846 }
847 }
848 return super.getChild(parent, fileName);
849 }
850
851 /**
852 * Type description for a file, directory, or folder as it would be displayed in
853 * a system file browser. Example from Windows: the "Desktop" folder
854 * is described as "Desktop".
855 *
856 * The Windows implementation gets information from the ShellFolder class.
857 */
858 public String getSystemTypeDescription(File f) {
859 if (f == null) {
860 return null;
861 }
862
863 try {
864 return getShellFolder(f).getFolderType();
865 } catch (FileNotFoundException e) {
866 return null;
867 }
868 }
869
870 /**
871 * @return the Desktop folder.
872 */
873 public File getHomeDirectory() {
874 File[] roots = getRoots();
875 return (roots.length == 0) ? null : roots[0];
876 }
877
878 /**
879 * Creates a new folder with a default folder name.
880 */
881 public File createNewFolder(File containingDir) throws IOException {
882 if(containingDir == null) {
883 throw new IOException("Containing directory is null:");
884 }
885 // Using NT's default folder name
886 File newFolder = createFileObject(containingDir, newFolderString);
887 int i = 2;
888 while (newFolder.exists() && i < 100) {
889 newFolder = createFileObject(containingDir, MessageFormat.format(
890 newFolderNextString, i));
891 i++;
892 }
893
894 if(newFolder.exists()) {
895 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
896 } else {
897 if(!newFolder.mkdirs()) {
898 throw new IOException(newFolder.getAbsolutePath());
899 }
900 }
901
902 return newFolder;
903 }
904
905 public boolean isDrive(File dir) {
906 return isFileSystemRoot(dir);
907 }
908
909 public boolean isFloppyDrive(final File dir) {
910 String path = AccessController.doPrivileged(new PrivilegedAction<String>() {
911 public String run() {
912 return dir.getAbsolutePath();
913 }
914 });
915
916 return path != null && (path.equals("A:\\") || path.equals("B:\\"));
917 }
918
919 /**
920 * Returns a File object constructed from the given path string.
921 */
922 public File createFileObject(String path) {
923 // Check for missing backslash after drive letter such as "C:" or "C:filename"
924 if (path.length() >= 2 && path.charAt(1) == ':' && Character.isLetter(path.charAt(0))) {
925 if (path.length() == 2) {
926 path += "\\";
927 } else if (path.charAt(2) != '\\') {
928 path = path.substring(0, 2) + "\\" + path.substring(2);
929 }
930 }
931 return super.createFileObject(path);
932 }
933
934 @SuppressWarnings("serial") // anonymous class
935 protected File createFileSystemRoot(File f) {
936 // Problem: Removable drives on Windows return false on f.exists()
937 // Workaround: Override exists() to always return true.
938 return new FileSystemRoot(f) {
939 public boolean exists() {
940 return true;
941 }
942 };
943 }
944
945 }
946
947 /**
948 * Fallthrough FileSystemView in case we can't determine the OS.
949 */
950 class GenericFileSystemView extends FileSystemView {
951
952 private static final String newFolderString =
953 UIManager.getString("FileChooser.other.newFolder");
954
955 /**
956 * Creates a new folder with a default folder name.
957 */
958 public File createNewFolder(File containingDir) throws IOException {
959 if(containingDir == null) {
960 throw new IOException("Containing directory is null:");
961 }
962 // Using NT's default folder name
963 File newFolder = createFileObject(containingDir, newFolderString);
964
965 if(newFolder.exists()) {
966 throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
967 } else {
968 if(!newFolder.mkdirs()) {
969 throw new IOException(newFolder.getAbsolutePath());
970 }
971 }
972 return newFolder;
973 }
974
975 }