javax.swing.filechooser
Class FileSystemView

java.lang.Object
  javax.swing.filechooser.FileSystemView

public abstract class FileSystemView

extends Object

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.

Java Licensees may want to provide a different implementation of FileSystemView to better handle a given operating system.

Constructor Summary

FileSystemView()

Method Summary

File	createFileObject(File dir, String filename) Returns a File object constructed in dir from the given filename.
File	createFileObject(String path) Returns a File object constructed from the given path string.
protected File	createFileSystemRoot(File f) Creates a new File object for f with correct behavior for a file system root directory.
abstract File	createNewFolder(File containingDir) Creates a new folder with a default folder name.
File	getChild(File parent, String fileName)
File	getDefaultDirectory() Return the user's default starting directory for the file chooser.
File[]	getFiles(File dir, boolean useFileHiding) Gets the list of shown (i.e.
static FileSystemView	getFileSystemView()
File	getHomeDirectory()
File	getParentDirectory(File dir) Returns the parent directory of dir.
File[]	getRoots() Returns all root partitions on this system.
String	getSystemDisplayName(File f) Name of a file, directory, or folder as it would be displayed in a system file browser.
Icon	getSystemIcon(File f) Icon for a file, directory, or folder as it would be displayed in a system file browser.
String	getSystemTypeDescription(File f) Type description for a file, directory, or folder as it would be displayed in a system file browser.
boolean	isComputerNode(File dir) Used by UI classes to decide whether to display a special icon for a computer node, e.g.
boolean	isDrive(File dir) Used by UI classes to decide whether to display a special icon for drives or partitions, e.g.
boolean	isFileSystem(File f) Checks if f represents a real directory or file as opposed to a special folder such as "Desktop".
boolean	isFileSystemRoot(File dir) Is dir the root of a tree in the file system, such as a drive or partition.
boolean	isFloppyDrive(File dir) Used by UI classes to decide whether to display a special icon for a floppy disk.
boolean	isHiddenFile(File f) Returns whether a file is hidden or not.
boolean	isParent(File folder, File file) On Windows, a file can appear in multiple folders, other than its parent directory in the filesystem.
boolean	isRoot(File f) Determines if the given file is a root in the navigatable tree(s).
Boolean	isTraversable(File f) Returns true if the file (directory) can be visited.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileSystemView

public FileSystemView()

Method Detail

getFileSystemView

public static FileSystemView getFileSystemView()

isRoot

public boolean isRoot(File f)

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, C:\, D:\, etc. Unix has one root, the "/" directory. The default implementation gets information from the ShellFolder class.

Parameters:

f - a File object representing a directory

Returns:

true if f is a root in the navigatable tree.

See Also:

isFileSystemRoot(java.io.File)

isTraversable

public Boolean isTraversable(File f)

Returns true if the file (directory) can be visited. Returns false if the directory cannot be traversed.

Parameters:

f - the File

Returns:

true if the file/directory can be traversed, otherwise false

See Also:

JFileChooser.isTraversable(java.io.File), FileView.isTraversable(java.io.File)

getSystemDisplayName

public String getSystemDisplayName(File f)

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.

Parameters:

f - a File object

Returns:

the file name as it would be displayed by a native file chooser

See Also:

JFileChooser.getName(java.io.File)

getSystemTypeDescription

public String getSystemTypeDescription(File f)

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.

Parameters:

f - a File object

Returns:

the file type description as it would be displayed by a native file chooser or null if no native information is available.

See Also:

JFileChooser.getTypeDescription(java.io.File)

getSystemIcon

public Icon getSystemIcon(File f)

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.

Parameters:

f - a File object

Returns:

an icon as it would be displayed by a native file chooser

See Also:

JFileChooser.getIcon(java.io.File)

isParent

public boolean isParent(File folder,
                        File file)

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().

Parameters:

folder - a File object repesenting a directory or special folder

file - a File object

Returns:

true if folder is a directory or special folder and contains file.

getChild

public File getChild(File parent,
                     String fileName)

Parameters:

parent - a File object repesenting a directory or special folder

fileName - a name of a file or folder which exists in parent

Returns:

a File object. This is normally constructed with new File(parent, fileName) except when parent and child are both special folders, in which case the File is a wrapper containing a ShellFolder object.

isFileSystem

public boolean isFileSystem(File f)

Checks if f represents a real directory or file as opposed to a special folder such as "Desktop". Used by UI classes to decide if a folder is selectable when doing directory choosing.

Parameters:

f - a File object

Returns:

true if f is a real file or directory.

createNewFolder

public abstract File createNewFolder(File containingDir)
                              throws IOException

Creates a new folder with a default folder name.

Throws:

IOException

isHiddenFile

public boolean isHiddenFile(File f)

Returns whether a file is hidden or not.

isFileSystemRoot

public boolean isFileSystemRoot(File dir)

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.

Returns:

true if f is a root of a filesystem

See Also:

isRoot(java.io.File)

isDrive

public boolean isDrive(File 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.

Parameters:

dir - a directory

Returns:

false always

isFloppyDrive

public boolean isFloppyDrive(File dir)

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.

Parameters:

dir - a directory

Returns:

false always

isComputerNode

public boolean isComputerNode(File dir)

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.

Parameters:

dir - a directory

Returns:

false always

getRoots

public File[] getRoots()

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.

getHomeDirectory

public File getHomeDirectory()

getDefaultDirectory

public File getDefaultDirectory()

Return the user's default starting directory for the file chooser.

Returns:

a File object representing the default starting folder

createFileObject

public File createFileObject(File dir,
                             String filename)

Returns a File object constructed in dir from the given filename.

createFileObject

public File createFileObject(String path)

Returns a File object constructed from the given path string.

getFiles

public File[] getFiles(File dir,
                       boolean useFileHiding)

Gets the list of shown (i.e. not hidden) files.

getParentDirectory

public File getParentDirectory(File dir)

Returns the parent directory of dir.

Parameters:

dir - the File being queried

Returns:

the parent directory of dir, or null if dir is null

createFileSystemRoot

protected File createFileSystemRoot(File f)

Creates a new File object for f with correct behavior for a file system root directory.

Parameters:

f - a File object representing a file system root directory, for example "/" on Unix or "C:\" on Windows.

Returns:

a new File object