com.bc.ceres.core

Class VirtualDir

java.lang.Object

com.bc.ceres.core.VirtualDir

public abstract class VirtualDir
extends Object

A read-only directory that can either be a directory in the file system or a ZIP-file. Files having '.gz' extensions are automatically decompressed.

Since:

Ceres 0.11

Constructor Summary

Constructors

Constructor and Description
VirtualDir()

Method Summary

Modifier and Type	Method and Description
abstract void	close() Closes access to this virtual directory.
static VirtualDir	create(File file) Creates an instance of a virtual directory object from a given directory or ZIP-file.
static File	createUniqueTempDir()
static void	deleteFileTree(File treeRoot) Deletes the directory treeRoot and all the content recursively.
abstract boolean	exists(String path)
protected void	finalize()
abstract String	getBasePath()
abstract File	getFile(String path) Gets the file for the given relative path.
abstract InputStream	getInputStream(String path) Opens an input stream for the given relative file path.
Reader	getReader(String path) Opens a reader for the given relative path.
File	getTempDir()
abstract boolean	isArchive()
abstract boolean	isCompressed()
abstract String[]	list(String path) Returns an array of strings naming the files and directories in the directory denoted by the given relative directory path.
abstract String[]	listAllFiles() Returns an array of strings naming the relative directory path of all file names.

Methods inherited from class java.lang.Object

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

Constructor Detail

VirtualDir

public VirtualDir()

Method Detail

getBasePath

public abstract String getBasePath()

Returns:

The base path name of the directory.

getReader

public Reader getReader(String path)
                 throws IOException

Opens a reader for the given relative path.

Parameters:

path - The relative file path.

Returns:

A reader for the specified relative path.

Throws:

IOException - If the file does not exist or if it can't be opened for reading.

getInputStream

public abstract InputStream getInputStream(String path)
                                    throws IOException

Opens an input stream for the given relative file path. Files having '.gz' extensions are automatically decompressed.

Parameters:

path - The relative file path.

Returns:

An input stream for the specified relative path.

Throws:

IOException - If the file does not exist or if it can't be opened for reading.

getFile

public abstract File getFile(String path)
                      throws IOException

Gets the file for the given relative path.

Parameters:

path - The relative file or directory path.

Returns:

Gets the file or directory for the specified file path.

Throws:

IOException - If the file or directory does not exist or if it can't be extracted from a ZIP-file.

list

public abstract String[] list(String path)
                       throws IOException

Returns an array of strings naming the files and directories in the directory denoted by the given relative directory path.

There is no guarantee that the name strings in the resulting array will appear in any specific order; they are not, in particular, guaranteed to appear in alphabetical order.

Parameters:

path - The relative directory path.

Returns:

An array of strings naming the files and directories in the directory denoted by the given relative directory path. The array will be empty if the directory is empty.

Throws:

IOException - If the directory given by the relative path does not exists.

exists

public abstract boolean exists(String path)

listAllFiles

public abstract String[] listAllFiles()
                               throws IOException

Returns an array of strings naming the relative directory path of all file names.

There is no guarantee that the name strings in the resulting array will appear in any specific order; they are not, in particular, guaranteed to appear in alphabetical order.

Returns:

An array of strings naming the relative directory path and filename to all files. The array will be empty if the directory is empty.

Throws:

IOException - If an I/O error is thrown when accessing the virtual dir.

close

public abstract void close()

Closes access to this virtual directory.

create

public static VirtualDir create(File file)

Creates an instance of a virtual directory object from a given directory or ZIP-file.

Parameters:

file - A directory or a ZIP-file.

Returns:

The virtual directory instance, or null if file is not a directory or a ZIP-file or the ZIP-file could not be opened for read access..

isCompressed

public abstract boolean isCompressed()

isArchive

public abstract boolean isArchive()

getTempDir

public File getTempDir()
                throws IOException

Throws:

IOException

finalize

protected void finalize()
                 throws Throwable

Overrides:

finalize in class Object

Throws:

Throwable

deleteFileTree

public static void deleteFileTree(File treeRoot)

Deletes the directory treeRoot and all the content recursively.

Parameters:

treeRoot - directory to be deleted

createUniqueTempDir

public static File createUniqueTempDir()
                                throws IOException

Throws:

IOException