Package org.apache.commons.io.filefilter

Class 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:
    Serialized Form

    • 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

    • 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.