org.apache.commons.vfs2.filter

Class EmptyFileFilter

java.lang.Object

org.apache.commons.vfs2.filter.EmptyFileFilter

All Implemented Interfaces:

java.io.Serializable, FileFilter

public class EmptyFileFilter
extends java.lang.Object
implements FileFilter, java.io.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:

 FileSystemManager fsManager = VFS.getManager();
 FileObject dir = fsManager.toFileObject(new File("."));
 FileObject[] files = dir.findFiles(new FileFilterSelector(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:

 FileSystemManager fsManager = VFS.getManager();
 FileObject dir = fsManager.toFileObject(new File("."));
 FileObject[] files = dir.findFiles(new FileFilterSelector(EmptyFileFilter.NOT_EMPTY));
 for (int i = 0; i < files.length; i++) {
     System.out.println(files[i]);
 }
 

Since:

2.4

See Also:

"http://commons.apache.org/proper/commons-io/", Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static FileFilter	EMPTY Singleton instance of empty filter.
static FileFilter	NOT_EMPTY Singleton instance of not-empty filter.
private static long	serialVersionUID

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EmptyFileFilter() Restrictive constructor.

Method Summary

Modifier and Type	Method and Description
boolean	accept(FileSelectInfo fileInfo) Checks to see if the file is empty.

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

EMPTY

public static final FileFilter EMPTY

Singleton instance of empty filter.

NOT_EMPTY

public static final FileFilter NOT_EMPTY

Singleton instance of not-empty filter.

Constructor Detail

EmptyFileFilter

protected EmptyFileFilter()

Restrictive constructor.

Method Detail

accept

public boolean accept(FileSelectInfo fileInfo)
               throws FileSystemException

Checks to see if the file is empty. A non-existing file is also considered empty.

Specified by:

accept in interface FileFilter

Parameters:

fileInfo - the file or directory to check

Returns:

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

Throws:

FileSystemException - Thrown for file system errors.