org.apache.commons.io.filefilter
Class EmptyFileFilter

java.lang.Object
  org.apache.commons.io.filefilter.AbstractFileFilter
      org.apache.commons.io.filefilter.EmptyFileFilter

All 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]);
 }
 

Since:

1.3

Version:

$Id: EmptyFileFilter.java 1307462 2012-03-30 15:13:11Z ggregory $

See Also:

Serialized Form

Field Summary

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

Constructor Summary

protected

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, toString

Methods inherited from class java.lang.Object

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

Field Detail

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 Detail

EmptyFileFilter

protected EmptyFileFilter()

Restrictive consructor.

Method Detail

accept

public boolean accept(File file)

Checks to see if the file is empty.

Specified by:

accept in interface FileFilter

Specified by:

accept in interface IOFileFilter

Overrides:

accept in class AbstractFileFilter

Parameters:

file - the file or directory to check

Returns:

true if the file or directory is empty, otherwise false.