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From "David Felsenthal (JIRA)" <>
Subject [jira] Created: (IO-176) Add an overridable sort callback to the filenames
Date Thu, 14 Aug 2008 14:47:45 GMT
Add an overridable sort  callback to the filenames

                 Key: IO-176
             Project: Commons IO
          Issue Type: Improvement
         Environment: Windows (others too I'm sure)
            Reporter: David Felsenthal
            Priority: Minor

Several people have requested the ability to sort the file names that are used by the directory
walker. I'd suggest (and have done for myself) using an overridable callback rather than a
filter. This allows current code to operate unbroken.

I changed line 394 of DirectoryWalker:
			File[] childFiles = handleFileNames((filter == null ? directory.listFiles() : directory.listFiles(filter)));

	 * Overridable callback method invoked when a directory is visited.
	 * <p>
	 * This implementation does nothing.
	 * @param names
	 *            the array of File objects in arbitrary order
	 * @return the (possibly manipulated) array of File           
	 * @throws IOException
	 *             if an I/O Error occurs
	protected File[] handleFileNames(File [] names) throws IOException {
		// do nothing - overridable by subclass
		return names;

And overrode it like this in my case, as I wanted reverse alphabetic:

			protected File[] handleFileNames(File[] names) throws IOException {
				Arrays.sort(names, new Comparator<File>() {
					public int compare(File file1, File file2) {
						return file2.getName().toUpperCase().compareTo(
				return names;

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