Add an overridable sort callback to the filenames
--------------------------------------------------
Key: IO-176
URL: https://issues.apache.org/jira/browse/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)));
Added:
/**
* 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:
@Override
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(
file1.getName().toUpperCase());
}
});
return names;
}
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