Package 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:

Closeable, AutoCloseable, 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.

Constructor Summary

Constructors

Constructor	Description
NullFilesCache()	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
void	clear(FileSystem filesystem)	Purges the entries corresponding to the FileSystem.
FileObject	getFile(FileSystem filesystem, FileName name)	Retrieves a FileObject from the cache by name.
void	putFile(FileObject file)	Adds a FileObject to the cache.
boolean	putFileIfAbsent(FileObject file)	Adds a FileObject to the cache if it isn't already present.
void	removeFile(FileSystem filesystem, FileName name)	Removes a file from cache.

Methods inherited from class org.apache.commons.vfs2.cache.AbstractFilesCache

touchFile

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

close, getContext, getLogger, init, setContext, setLogger

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.vfs2.FilesCache

close

Constructor Details

NullFilesCache

public NullFilesCache()

Constructs a new instance.

Method Details

clear

public void clear(FileSystem filesystem)

Description copied from interface: FilesCache

Purges the entries corresponding to the FileSystem.

Parameters:

filesystem - The FileSystem.

getFile

public FileObject getFile(FileSystem filesystem,
 FileName name)

Description copied from interface: FilesCache

Retrieves a FileObject from the cache by name.

Parameters:

filesystem - The FileSystem.

name - the name

Returns:

the file object or null if file is not cached

putFile

public void putFile(FileObject file)

Description copied from interface: FilesCache

Adds a FileObject to the cache.

Parameters:

file - the file

putFileIfAbsent

public boolean putFileIfAbsent(FileObject file)

Description copied from interface: FilesCache

Adds a FileObject to the cache if it isn't already present.

Parameters:

file - the file

Returns:

true if the file was stored, false otherwise.

removeFile

public void removeFile(FileSystem filesystem,
 FileName name)

Description copied from interface: FilesCache

Removes a file from cache.

Parameters:

filesystem - file system

name - file name