org.apache.commons.vfs2.cache

Class NullFilesCache

java.lang.Object

org.apache.commons.vfs2.provider.AbstractVfsComponent

org.apache.commons.vfs2.cache.AbstractFilesCache

org.apache.commons.vfs2.cache.NullFilesCache

All Implemented Interfaces:

FilesCache, VfsComponent

public class NullFilesCache
extends AbstractFilesCache

A FilesCache implementation.
This implementation never ever caches a single file.

Notice: if you use resolveFile(uri) multiple times with the same path, the system will always create a new instance. Changes on one instance of this file are not seen by the others.

Version:

$Revision: 1037973 $ $Date: 2010-11-23 07:57:44 +0530 (Tue, 23 Nov 2010) $

Author:

Commons VFS team

Constructor Summary

Constructors

Constructor and Description
NullFilesCache()

Method Summary

Methods

Modifier and Type	Method and Description
void	clear(FileSystem filesystem) purge the entries corresponding to the filesystem.
void	close() Closes the provider.
FileObject	getFile(FileSystem filesystem, FileName name) retrieve a file from the cache by its name.
void	putFile(FileObject file) add a fileobject to the cache.
boolean	putFileIfAbsent(FileObject file) add a fileobject to the cache if it isn't already present.
void	removeFile(FileSystem filesystem, FileName name) removes a file from cache.
void	touchFile(FileObject file)

Methods inherited from class org.apache.commons.vfs2.provider.AbstractVfsComponent

getContext, getLogger, init, setContext, setLogger

Methods inherited from class java.lang.Object

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

Constructor Detail

NullFilesCache

public NullFilesCache()

Method Detail

putFile

public void putFile(FileObject file)

Description copied from interface: FilesCache

add a fileobject to the cache.

Parameters:

file - the file

putFileIfAbsent

public boolean putFileIfAbsent(FileObject file)

Description copied from interface: FilesCache

add a fileobject to the cache if it isn't already present.

Parameters:

file - the file

Returns:

true if the file was stored, false otherwise.

getFile

public FileObject getFile(FileSystem filesystem,
                 FileName name)

Description copied from interface: FilesCache

retrieve a file from the cache by its name.

Parameters:

filesystem - The FileSystem.

name - the name

Returns:

the fileobject or null if file is not cached

clear

public void clear(FileSystem filesystem)

Description copied from interface: FilesCache

purge the entries corresponding to the filesystem.

Parameters:

filesystem - The FileSystem.

close

public void close()

Description copied from class: AbstractVfsComponent

Closes the provider. This implementation does nothing.

Specified by:

close in interface FilesCache

Specified by:

close in interface VfsComponent

Overrides:

close in class AbstractVfsComponent

removeFile

public void removeFile(FileSystem filesystem,
              FileName name)

Description copied from interface: FilesCache

removes a file from cache.

Parameters:

filesystem - filesystem

name - filename

touchFile

public void touchFile(FileObject file)