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 1642757 2014-12-01 21:09:30Z sebb $
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static IOFileFilter` | `EMPTY` Singleton instance of empty filter
    `static IOFileFilter` | `NOT_EMPTY` Singleton instance of not-empty filter

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `EmptyFileFilter()` Restrictive consructor.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `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`.

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