org.apache.commons.vfs2.util
Class WeakRefFileListener

java.lang.Object
  org.apache.commons.vfs2.util.WeakRefFileListener

All Implemented Interfaces:

FileListener

public class WeakRefFileListener
extends Object
implements FileListener

Wrap a listener with a WeakReference.

Since:

2.0

Author:

Commons VFS team

Constructor Summary

protected

WeakRefFileListener(FileObject file, FileListener listener)

Method Summary

void	fileChanged(FileChangeEvent event) Called when a file is changed.
void	fileCreated(FileChangeEvent event) Called when a file is created.
void	fileDeleted(FileChangeEvent event) Called when a file is deleted.
protected FileListener	getListener() returns the wrapped listener.
static void	installListener(FileObject file, FileListener listener) This will install the listener at the given file.

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakRefFileListener

protected WeakRefFileListener(FileObject file,
                              FileListener listener)

Method Detail

installListener

public static void installListener(FileObject file,
                                   FileListener listener)

This will install the listener at the given file.

Parameters:

file - The FileObject to listen on.

listener - The FileListener

getListener

protected FileListener getListener()
                            throws Exception

returns the wrapped listener. If it is gone, the WeakRefFileListener wrapper will remove itself from the list of listeners.

Returns:

The FileListener.

Throws:

Exception - if an error occurs.

fileCreated

public void fileCreated(FileChangeEvent event)
                 throws Exception

Called when a file is created.

Specified by:

fileCreated in interface FileListener

Parameters:

event - The FileChangeEvent.

Throws:

Exception - if an error occurs.

fileDeleted

public void fileDeleted(FileChangeEvent event)
                 throws Exception

Called when a file is deleted.

Specified by:

fileDeleted in interface FileListener

Parameters:

event - The FileChangeEvent.

Throws:

Exception - if an error occurs.

fileChanged

public void fileChanged(FileChangeEvent event)
                 throws Exception

Called when a file is changed.

This will only happen if you monitor the file using FileMonitor.

Specified by:

fileChanged in interface FileListener

Parameters:

event - The FileChangeEvent.

Throws:

Exception - if an error occurs.