/* * Copyright (c) 1998, 2008, 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");     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;    }     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 navigatable 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 navigatable 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 desribed 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 repesenting 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 repesenting 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.     */    public abstract File createNewFolder(File containingDir) throws IOException;     /**     * Returns whether a file is hidden or not.     */    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.     */    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.     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.     */    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.     */    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.     */    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;                }            }

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