org.apache.commons.io.filefilter

Class EmptyFileFilter

Implemented Interfaces:
FileFilter, FilenameFilter, Serializable, IOFileFilter

public class EmptyFileFilter
extends AbstractFileFilter
implements Serializable

This filter accepts files or directories that are empty.

If the File is a directory it checks that it contains no files.

Example, showing how to print out a list of the current directory's empty files/directories:

 File dir = new File(".");
 String[] files = dir.list( EmptyFileFilter.EMPTY );
 for ( int i = 0; i < files.length; i++ ) {
     System.out.println(files[i]);
 }
 

Example, showing how to print out a list of the current directory's non-empty files/directories:

 File dir = new File(".");
 String[] files = dir.list( EmptyFileFilter.NOT_EMPTY );
 for ( int i = 0; i < files.length; i++ ) {
     System.out.println(files[i]);
 }
 
Version:
$Revision: 587916 $
Since:
Commons IO 1.3

Field Summary

static IOFileFilter
EMPTY
Singleton instance of empty filter
static IOFileFilter
NOT_EMPTY
Singleton instance of not-empty filter

Constructor Summary

EmptyFileFilter()
Restrictive consructor.

Method Summary

boolean
accept(File file)
Checks to see if the file is empty.

Methods inherited from class org.apache.commons.io.filefilter.AbstractFileFilter

accept, accept, toString

Field Details

EMPTY

public static final IOFileFilter EMPTY
Singleton instance of empty filter

NOT_EMPTY

public static final IOFileFilter NOT_EMPTY
Singleton instance of not-empty filter

Constructor Details

EmptyFileFilter

protected EmptyFileFilter()
Restrictive consructor.

Method Details

accept

public boolean accept(File file)
Checks to see if the file is empty.
Specified by:
accept in interface IOFileFilter
Overrides:
accept in interface AbstractFileFilter
Parameters:
file - the file or directory to check
Returns:
true if the file or directory is empty, otherwise false.

Copyright (c) 2002-2008 Apache Software Foundation