--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/share/classes/javax/swing/filechooser/FileSystemView.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,919 @@
+/*
+ * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package javax.swing.filechooser;
+
+
+import javax.swing.*;
+
+import java.awt.Image;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.text.MessageFormat;
+import java.util.List;
+import java.util.ArrayList;
+import java.lang.ref.WeakReference;
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyChangeEvent;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
+import sun.awt.shell.*;
+
+/**
+ * FileSystemView is JFileChooser's gateway to the
+ * file system. Since the JDK1.1 File API doesn't allow
+ * access to such information as root partitions, file type
+ * information, or hidden file bits, this class is designed
+ * to intuit as much OS-specific file system information as
+ * possible.
+ *
+ * <p>
+ *
+ * Java Licensees may want to provide a different implementation of
+ * FileSystemView to better handle a given operating system.
+ *
+ * @author Jeff Dinkins
+ */
+
+// PENDING(jeff) - need to provide a specification for
+// how Mac/OS2/BeOS/etc file systems can modify FileSystemView
+// to handle their particular type of file system.
+
+public abstract class FileSystemView {
+
+ static FileSystemView windowsFileSystemView = null;
+ static FileSystemView unixFileSystemView = null;
+ //static FileSystemView macFileSystemView = null;
+ static FileSystemView genericFileSystemView = null;
+
+ private boolean useSystemExtensionHiding =
+ UIManager.getDefaults().getBoolean("FileChooser.useSystemExtensionHiding");
+
+ /**
+ * Returns the file system view.
+ * @return the file system view
+ */
+ public static FileSystemView getFileSystemView() {
+ if(File.separatorChar == '\\') {
+ if(windowsFileSystemView == null) {
+ windowsFileSystemView = new WindowsFileSystemView();
+ }
+ return windowsFileSystemView;
+ }
+
+ if(File.separatorChar == '/') {
+ if(unixFileSystemView == null) {
+ unixFileSystemView = new UnixFileSystemView();
+ }
+ return unixFileSystemView;
+ }
+
+ // if(File.separatorChar == ':') {
+ // if(macFileSystemView == null) {
+ // macFileSystemView = new MacFileSystemView();
+ // }
+ // return macFileSystemView;
+ //}
+
+ if(genericFileSystemView == null) {
+ genericFileSystemView = new GenericFileSystemView();
+ }
+ return genericFileSystemView;
+ }
+
+ /**
+ * Constructs a FileSystemView.
+ */
+ public FileSystemView() {
+ final WeakReference<FileSystemView> weakReference = new WeakReference<FileSystemView>(this);
+
+ UIManager.addPropertyChangeListener(new PropertyChangeListener() {
+ public void propertyChange(PropertyChangeEvent evt) {
+ FileSystemView fileSystemView = weakReference.get();
+
+ if (fileSystemView == null) {
+ // FileSystemView was destroyed
+ UIManager.removePropertyChangeListener(this);
+ } else {
+ if (evt.getPropertyName().equals("lookAndFeel")) {
+ fileSystemView.useSystemExtensionHiding =
+ UIManager.getDefaults().getBoolean("FileChooser.useSystemExtensionHiding");
+ }
+ }
+ }
+ });
+ }
+
+ /**
+ * Determines if the given file is a root in the navigable tree(s).
+ * Examples: Windows 98 has one root, the Desktop folder. DOS has one root
+ * per drive letter, <code>C:\</code>, <code>D:\</code>, etc. Unix has one root,
+ * the <code>"/"</code> directory.
+ *
+ * The default implementation gets information from the <code>ShellFolder</code> class.
+ *
+ * @param f a <code>File</code> object representing a directory
+ * @return <code>true</code> if <code>f</code> is a root in the navigable tree.
+ * @see #isFileSystemRoot
+ */
+ public boolean isRoot(File f) {
+ if (f == null || !f.isAbsolute()) {
+ return false;
+ }
+
+ File[] roots = getRoots();
+ for (File root : roots) {
+ if (root.equals(f)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Returns true if the file (directory) can be visited.
+ * Returns false if the directory cannot be traversed.
+ *
+ * @param f the <code>File</code>
+ * @return <code>true</code> if the file/directory can be traversed, otherwise <code>false</code>
+ * @see JFileChooser#isTraversable
+ * @see FileView#isTraversable
+ * @since 1.4
+ */
+ public Boolean isTraversable(File f) {
+ return Boolean.valueOf(f.isDirectory());
+ }
+
+ /**
+ * Name of a file, directory, or folder as it would be displayed in
+ * a system file browser. Example from Windows: the "M:\" directory
+ * displays as "CD-ROM (M:)"
+ *
+ * The default implementation gets information from the ShellFolder class.
+ *
+ * @param f a <code>File</code> object
+ * @return the file name as it would be displayed by a native file chooser
+ * @see JFileChooser#getName
+ * @since 1.4
+ */
+ public String getSystemDisplayName(File f) {
+ if (f == null) {
+ return null;
+ }
+
+ String name = f.getName();
+
+ if (!name.equals("..") && !name.equals(".") &&
+ (useSystemExtensionHiding || !isFileSystem(f) || isFileSystemRoot(f)) &&
+ (f instanceof ShellFolder || f.exists())) {
+
+ try {
+ name = getShellFolder(f).getDisplayName();
+ } catch (FileNotFoundException e) {
+ return null;
+ }
+
+ if (name == null || name.length() == 0) {
+ name = f.getPath(); // e.g. "/"
+ }
+ }
+
+ return name;
+ }
+
+ /**
+ * Type description for a file, directory, or folder as it would be displayed in
+ * a system file browser. Example from Windows: the "Desktop" folder
+ * is described as "Desktop".
+ *
+ * Override for platforms with native ShellFolder implementations.
+ *
+ * @param f a <code>File</code> object
+ * @return the file type description as it would be displayed by a native file chooser
+ * or null if no native information is available.
+ * @see JFileChooser#getTypeDescription
+ * @since 1.4
+ */
+ public String getSystemTypeDescription(File f) {
+ return null;
+ }
+
+ /**
+ * Icon for a file, directory, or folder as it would be displayed in
+ * a system file browser. Example from Windows: the "M:\" directory
+ * displays a CD-ROM icon.
+ *
+ * The default implementation gets information from the ShellFolder class.
+ *
+ * @param f a <code>File</code> object
+ * @return an icon as it would be displayed by a native file chooser
+ * @see JFileChooser#getIcon
+ * @since 1.4
+ */
+ public Icon getSystemIcon(File f) {
+ if (f == null) {
+ return null;
+ }
+
+ ShellFolder sf;
+
+ try {
+ sf = getShellFolder(f);
+ } catch (FileNotFoundException e) {
+ return null;
+ }
+
+ Image img = sf.getIcon(false);
+
+ if (img != null) {
+ return new ImageIcon(img, sf.getFolderType());
+ } else {
+ return UIManager.getIcon(f.isDirectory() ? "FileView.directoryIcon" : "FileView.fileIcon");
+ }
+ }
+
+ /**
+ * On Windows, a file can appear in multiple folders, other than its
+ * parent directory in the filesystem. Folder could for example be the
+ * "Desktop" folder which is not the same as file.getParentFile().
+ *
+ * @param folder a <code>File</code> object representing a directory or special folder
+ * @param file a <code>File</code> object
+ * @return <code>true</code> if <code>folder</code> is a directory or special folder and contains <code>file</code>.
+ * @since 1.4
+ */
+ public boolean isParent(File folder, File file) {
+ if (folder == null || file == null) {
+ return false;
+ } else if (folder instanceof ShellFolder) {
+ File parent = file.getParentFile();
+ if (parent != null && parent.equals(folder)) {
+ return true;
+ }
+ File[] children = getFiles(folder, false);
+ for (File child : children) {
+ if (file.equals(child)) {
+ return true;
+ }
+ }
+ return false;
+ } else {
+ return folder.equals(file.getParentFile());
+ }
+ }
+
+ /**
+ *
+ * @param parent a <code>File</code> object representing a directory or special folder
+ * @param fileName a name of a file or folder which exists in <code>parent</code>
+ * @return a File object. This is normally constructed with <code>new
+ * File(parent, fileName)</code> except when parent and child are both
+ * special folders, in which case the <code>File</code> is a wrapper containing
+ * a <code>ShellFolder</code> object.
+ * @since 1.4
+ */
+ public File getChild(File parent, String fileName) {
+ if (parent instanceof ShellFolder) {
+ File[] children = getFiles(parent, false);
+ for (File child : children) {
+ if (child.getName().equals(fileName)) {
+ return child;
+ }
+ }
+ }
+ return createFileObject(parent, fileName);
+ }
+
+
+ /**
+ * Checks if <code>f</code> represents a real directory or file as opposed to a
+ * special folder such as <code>"Desktop"</code>. Used by UI classes to decide if
+ * a folder is selectable when doing directory choosing.
+ *
+ * @param f a <code>File</code> object
+ * @return <code>true</code> if <code>f</code> is a real file or directory.
+ * @since 1.4
+ */
+ public boolean isFileSystem(File f) {
+ if (f instanceof ShellFolder) {
+ ShellFolder sf = (ShellFolder)f;
+ // Shortcuts to directories are treated as not being file system objects,
+ // so that they are never returned by JFileChooser.
+ return sf.isFileSystem() && !(sf.isLink() && sf.isDirectory());
+ } else {
+ return true;
+ }
+ }
+
+ /**
+ * Creates a new folder with a default folder name.
+ *
+ * @param containingDir a {@code File} object denoting directory to contain the new folder
+ * @return a {@code File} object denoting the newly created folder
+ * @throws IOException if new folder could not be created
+ */
+ public abstract File createNewFolder(File containingDir) throws IOException;
+
+ /**
+ * Returns whether a file is hidden or not.
+ *
+ * @param f a {@code File} object
+ * @return true if the given {@code File} denotes a hidden file
+ */
+ public boolean isHiddenFile(File f) {
+ return f.isHidden();
+ }
+
+
+ /**
+ * Is dir the root of a tree in the file system, such as a drive
+ * or partition. Example: Returns true for "C:\" on Windows 98.
+ *
+ * @param dir a <code>File</code> object representing a directory
+ * @return <code>true</code> if <code>f</code> is a root of a filesystem
+ * @see #isRoot
+ * @since 1.4
+ */
+ public boolean isFileSystemRoot(File dir) {
+ return ShellFolder.isFileSystemRoot(dir);
+ }
+
+ /**
+ * Used by UI classes to decide whether to display a special icon
+ * for drives or partitions, e.g. a "hard disk" icon.
+ *
+ * The default implementation has no way of knowing, so always returns false.
+ *
+ * @param dir a directory
+ * @return <code>false</code> always
+ * @since 1.4
+ */
+ public boolean isDrive(File dir) {
+ return false;
+ }
+
+ /**
+ * Used by UI classes to decide whether to display a special icon
+ * for a floppy disk. Implies isDrive(dir).
+ *
+ * The default implementation has no way of knowing, so always returns false.
+ *
+ * @param dir a directory
+ * @return <code>false</code> always
+ * @since 1.4
+ */
+ public boolean isFloppyDrive(File dir) {
+ return false;
+ }
+
+ /**
+ * Used by UI classes to decide whether to display a special icon
+ * for a computer node, e.g. "My Computer" or a network server.
+ *
+ * The default implementation has no way of knowing, so always returns false.
+ *
+ * @param dir a directory
+ * @return <code>false</code> always
+ * @since 1.4
+ */
+ public boolean isComputerNode(File dir) {
+ return ShellFolder.isComputerNode(dir);
+ }
+
+
+ /**
+ * Returns all root partitions on this system. For example, on
+ * Windows, this would be the "Desktop" folder, while on DOS this
+ * would be the A: through Z: drives.
+ *
+ * @return an array of {@code File} objects representing all root partitions
+ * on this system
+ */
+ public File[] getRoots() {
+ // Don't cache this array, because filesystem might change
+ File[] roots = (File[])ShellFolder.get("roots");
+
+ for (int i = 0; i < roots.length; i++) {
+ if (isFileSystemRoot(roots[i])) {
+ roots[i] = createFileSystemRoot(roots[i]);
+ }
+ }
+ return roots;
+ }
+
+
+ // Providing default implementations for the remaining methods
+ // because most OS file systems will likely be able to use this
+ // code. If a given OS can't, override these methods in its
+ // implementation.
+
+ /**
+ * Returns the home directory.
+ * @return the home directory
+ */
+ public File getHomeDirectory() {
+ return createFileObject(System.getProperty("user.home"));
+ }
+
+ /**
+ * Return the user's default starting directory for the file chooser.
+ *
+ * @return a <code>File</code> object representing the default
+ * starting folder
+ * @since 1.4
+ */
+ public File getDefaultDirectory() {
+ File f = (File)ShellFolder.get("fileChooserDefaultFolder");
+ if (isFileSystemRoot(f)) {
+ f = createFileSystemRoot(f);
+ }
+ return f;
+ }
+
+ /**
+ * Returns a File object constructed in dir from the given filename.
+ *
+ * @param dir an abstract pathname denoting a directory
+ * @param filename a {@code String} representation of a pathname
+ * @return a {@code File} object created from {@code dir} and {@code filename}
+ */
+ public File createFileObject(File dir, String filename) {
+ if(dir == null) {
+ return new File(filename);
+ } else {
+ return new File(dir, filename);
+ }
+ }
+
+ /**
+ * Returns a File object constructed from the given path string.
+ *
+ * @param path {@code String} representation of path
+ * @return a {@code File} object created from the given {@code path}
+ */
+ public File createFileObject(String path) {
+ File f = new File(path);
+ if (isFileSystemRoot(f)) {
+ f = createFileSystemRoot(f);
+ }
+ return f;
+ }
+
+
+ /**
+ * Gets the list of shown (i.e. not hidden) files.
+ *
+ * @param dir the root directory of files to be returned
+ * @param useFileHiding determine if hidden files are returned
+ * @return an array of {@code File} objects representing files and
+ * directories in the given {@code dir}. It includes hidden
+ * files if {@code useFileHiding} is false.
+ */
+ public File[] getFiles(File dir, boolean useFileHiding) {
+ List<File> files = new ArrayList<File>();
+
+ // add all files in dir
+ if (!(dir instanceof ShellFolder)) {
+ try {
+ dir = getShellFolder(dir);
+ } catch (FileNotFoundException e) {
+ return new File[0];
+ }
+ }
+
+ File[] names = ((ShellFolder) dir).listFiles(!useFileHiding);
+
+ if (names == null) {
+ return new File[0];
+ }
+
+ for (File f : names) {
+ if (Thread.currentThread().isInterrupted()) {
+ break;
+ }
+
+ if (!(f instanceof ShellFolder)) {
+ if (isFileSystemRoot(f)) {
+ f = createFileSystemRoot(f);
+ }
+ try {
+ f = ShellFolder.getShellFolder(f);
+ } catch (FileNotFoundException e) {
+ // Not a valid file (wouldn't show in native file chooser)
+ // Example: C:\pagefile.sys
+ continue;
+ } catch (InternalError e) {
+ // Not a valid file (wouldn't show in native file chooser)
+ // Example C:\Winnt\Profiles\joe\history\History.IE5
+ continue;
+ }
+ }
+ if (!useFileHiding || !isHiddenFile(f)) {
+ files.add(f);
+ }
+ }
+
+ return files.toArray(new File[files.size()]);
+ }
+
+
+
+ /**
+ * Returns the parent directory of <code>dir</code>.
+ * @param dir the <code>File</code> being queried
+ * @return the parent directory of <code>dir</code>, or
+ * <code>null</code> if <code>dir</code> is <code>null</code>
+ */
+ public File getParentDirectory(File dir) {
+ if (dir == null || !dir.exists()) {
+ return null;
+ }
+
+ ShellFolder sf;
+
+ try {
+ sf = getShellFolder(dir);
+ } catch (FileNotFoundException e) {
+ return null;
+ }
+
+ File psf = sf.getParentFile();
+
+ if (psf == null) {
+ return null;
+ }
+
+ if (isFileSystem(psf)) {
+ File f = psf;
+ if (!f.exists()) {
+ // This could be a node under "Network Neighborhood".
+ File ppsf = psf.getParentFile();
+ if (ppsf == null || !isFileSystem(ppsf)) {
+ // We're mostly after the exists() override for windows below.
+ f = createFileSystemRoot(f);
+ }
+ }
+ return f;
+ } else {
+ return psf;
+ }
+ }
+
+ /**
+ * Returns an array of files representing the values to show by default in
+ * the file chooser selector.
+ *
+ * @return an array of {@code File} objects.
+ * @throws SecurityException if the caller does not have necessary
+ * permissions
+ * @since 9
+ */
+ public File[] getChooserComboBoxFiles() {
+ return (File[]) ShellFolder.get("fileChooserComboBoxFolders");
+ }
+
+ /**
+ * Returns whether the specified file denotes a shell interpreted link which
+ * can be obtained by the {@link #getLinkLocation(File)}.
+ *
+ * @param file a file
+ * @return whether this is a link
+ * @throws NullPointerException if {@code file} equals {@code null}
+ * @throws SecurityException if the caller does not have necessary
+ * permissions
+ * @see #getLinkLocation(File)
+ * @since 9
+ */
+ public boolean isLink(File file) {
+ if (file == null) {
+ throw new NullPointerException("file is null");
+ }
+ try {
+ return ShellFolder.getShellFolder(file).isLink();
+ } catch (FileNotFoundException e) {
+ return false;
+ }
+ }
+
+ /**
+ * Returns the regular file referenced by the specified link file if
+ * the specified file is a shell interpreted link.
+ * Returns {@code null} if the specified file is not
+ * a shell interpreted link.
+ *
+ * @param file a file
+ * @return the linked file or {@code null}.
+ * @throws FileNotFoundException if the linked file does not exist
+ * @throws NullPointerException if {@code file} equals {@code null}
+ * @throws SecurityException if the caller does not have necessary
+ * permissions
+ * @since 9
+ */
+ public File getLinkLocation(File file) throws FileNotFoundException {
+ if (file == null) {
+ throw new NullPointerException("file is null");
+ }
+ ShellFolder shellFolder;
+ try {
+ shellFolder = ShellFolder.getShellFolder(file);
+ } catch (FileNotFoundException e) {
+ return null;
+ }
+ return shellFolder.isLink() ? shellFolder.getLinkLocation() : null;
+ }
+
+ /**
+ * Throws {@code FileNotFoundException} if file not found or current thread was interrupted
+ */
+ ShellFolder getShellFolder(File f) throws FileNotFoundException {
+ if (!(f instanceof ShellFolder) && !(f instanceof FileSystemRoot) && isFileSystemRoot(f)) {
+ f = createFileSystemRoot(f);
+ }
+
+ try {
+ return ShellFolder.getShellFolder(f);
+ } catch (InternalError e) {
+ System.err.println("FileSystemView.getShellFolder: f="+f);
+ e.printStackTrace();
+ return null;
+ }
+ }
+
+ /**
+ * Creates a new <code>File</code> object for <code>f</code> with correct
+ * behavior for a file system root directory.
+ *
+ * @param f a <code>File</code> object representing a file system root
+ * directory, for example "/" on Unix or "C:\" on Windows.
+ * @return a new <code>File</code> object
+ * @since 1.4
+ */
+ protected File createFileSystemRoot(File f) {
+ return new FileSystemRoot(f);
+ }
+
+ @SuppressWarnings("serial") // Same-version serialization only
+ static class FileSystemRoot extends File {
+ public FileSystemRoot(File f) {
+ super(f,"");
+ }
+
+ public FileSystemRoot(String s) {
+ super(s);
+ }
+
+ public boolean isDirectory() {
+ return true;
+ }
+
+ public String getName() {
+ return getPath();
+ }
+ }
+}
+
+/**
+ * FileSystemView that handles some specific unix-isms.
+ */
+class UnixFileSystemView extends FileSystemView {
+
+ private static final String newFolderString =
+ UIManager.getString("FileChooser.other.newFolder");
+ private static final String newFolderNextString =
+ UIManager.getString("FileChooser.other.newFolder.subsequent");
+
+ /**
+ * Creates a new folder with a default folder name.
+ */
+ public File createNewFolder(File containingDir) throws IOException {
+ if(containingDir == null) {
+ throw new IOException("Containing directory is null:");
+ }
+ File newFolder;
+ // Unix - using OpenWindows' default folder name. Can't find one for Motif/CDE.
+ newFolder = createFileObject(containingDir, newFolderString);
+ int i = 1;
+ while (newFolder.exists() && i < 100) {
+ newFolder = createFileObject(containingDir, MessageFormat.format(
+ newFolderNextString, i));
+ i++;
+ }
+
+ if(newFolder.exists()) {
+ throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
+ } else {
+ if(!newFolder.mkdirs()) {
+ throw new IOException(newFolder.getAbsolutePath());
+ }
+ }
+
+ return newFolder;
+ }
+
+ public boolean isFileSystemRoot(File dir) {
+ return dir != null && dir.getAbsolutePath().equals("/");
+ }
+
+ public boolean isDrive(File dir) {
+ return isFloppyDrive(dir);
+ }
+
+ public boolean isFloppyDrive(File dir) {
+ // Could be looking at the path for Solaris, but wouldn't be reliable.
+ // For example:
+ // return (dir != null && dir.getAbsolutePath().toLowerCase().startsWith("/floppy"));
+ return false;
+ }
+
+ public boolean isComputerNode(File dir) {
+ if (dir != null) {
+ String parent = dir.getParent();
+ if (parent != null && parent.equals("/net")) {
+ return true;
+ }
+ }
+ return false;
+ }
+}
+
+
+/**
+ * FileSystemView that handles some specific windows concepts.
+ */
+class WindowsFileSystemView extends FileSystemView {
+
+ private static final String newFolderString =
+ UIManager.getString("FileChooser.win32.newFolder");
+ private static final String newFolderNextString =
+ UIManager.getString("FileChooser.win32.newFolder.subsequent");
+
+ public Boolean isTraversable(File f) {
+ return Boolean.valueOf(isFileSystemRoot(f) || isComputerNode(f) || f.isDirectory());
+ }
+
+ public File getChild(File parent, String fileName) {
+ if (fileName.startsWith("\\")
+ && !fileName.startsWith("\\\\")
+ && isFileSystem(parent)) {
+
+ //Path is relative to the root of parent's drive
+ String path = parent.getAbsolutePath();
+ if (path.length() >= 2
+ && path.charAt(1) == ':'
+ && Character.isLetter(path.charAt(0))) {
+
+ return createFileObject(path.substring(0, 2) + fileName);
+ }
+ }
+ return super.getChild(parent, fileName);
+ }
+
+ /**
+ * Type description for a file, directory, or folder as it would be displayed in
+ * a system file browser. Example from Windows: the "Desktop" folder
+ * is described as "Desktop".
+ *
+ * The Windows implementation gets information from the ShellFolder class.
+ */
+ public String getSystemTypeDescription(File f) {
+ if (f == null) {
+ return null;
+ }
+
+ try {
+ return getShellFolder(f).getFolderType();
+ } catch (FileNotFoundException e) {
+ return null;
+ }
+ }
+
+ /**
+ * @return the Desktop folder.
+ */
+ public File getHomeDirectory() {
+ File[] roots = getRoots();
+ return (roots.length == 0) ? null : roots[0];
+ }
+
+ /**
+ * Creates a new folder with a default folder name.
+ */
+ public File createNewFolder(File containingDir) throws IOException {
+ if(containingDir == null) {
+ throw new IOException("Containing directory is null:");
+ }
+ // Using NT's default folder name
+ File newFolder = createFileObject(containingDir, newFolderString);
+ int i = 2;
+ while (newFolder.exists() && i < 100) {
+ newFolder = createFileObject(containingDir, MessageFormat.format(
+ newFolderNextString, i));
+ i++;
+ }
+
+ if(newFolder.exists()) {
+ throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
+ } else {
+ if(!newFolder.mkdirs()) {
+ throw new IOException(newFolder.getAbsolutePath());
+ }
+ }
+
+ return newFolder;
+ }
+
+ public boolean isDrive(File dir) {
+ return isFileSystemRoot(dir);
+ }
+
+ public boolean isFloppyDrive(final File dir) {
+ String path = AccessController.doPrivileged(new PrivilegedAction<String>() {
+ public String run() {
+ return dir.getAbsolutePath();
+ }
+ });
+
+ return path != null && (path.equals("A:\\") || path.equals("B:\\"));
+ }
+
+ /**
+ * Returns a File object constructed from the given path string.
+ */
+ public File createFileObject(String path) {
+ // Check for missing backslash after drive letter such as "C:" or "C:filename"
+ if (path.length() >= 2 && path.charAt(1) == ':' && Character.isLetter(path.charAt(0))) {
+ if (path.length() == 2) {
+ path += "\\";
+ } else if (path.charAt(2) != '\\') {
+ path = path.substring(0, 2) + "\\" + path.substring(2);
+ }
+ }
+ return super.createFileObject(path);
+ }
+
+ @SuppressWarnings("serial") // anonymous class
+ protected File createFileSystemRoot(File f) {
+ // Problem: Removable drives on Windows return false on f.exists()
+ // Workaround: Override exists() to always return true.
+ return new FileSystemRoot(f) {
+ public boolean exists() {
+ return true;
+ }
+ };
+ }
+
+}
+
+/**
+ * Fallthrough FileSystemView in case we can't determine the OS.
+ */
+class GenericFileSystemView extends FileSystemView {
+
+ private static final String newFolderString =
+ UIManager.getString("FileChooser.other.newFolder");
+
+ /**
+ * Creates a new folder with a default folder name.
+ */
+ public File createNewFolder(File containingDir) throws IOException {
+ if(containingDir == null) {
+ throw new IOException("Containing directory is null:");
+ }
+ // Using NT's default folder name
+ File newFolder = createFileObject(containingDir, newFolderString);
+
+ if(newFolder.exists()) {
+ throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
+ } else {
+ if(!newFolder.mkdirs()) {
+ throw new IOException(newFolder.getAbsolutePath());
+ }
+ }
+ return newFolder;
+ }
+
+}