Package 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
See Also:

  • Field Details

    • serialVersionUID

      private static final long serialVersionUID
      See Also:

    • 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 constructor.

  • Method Details

    • 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.