I have the following additional IOFileFilter implementations:
1) CanReadFileFilter checks File.canRead()
2) CanWriteFileFilter checks File.canWrite()
3) HiddenFileFilter checks File.isHidden()
4) EmptyFileFilter checks either File contents are empty or directories contain no files
I've been messing around with Commons Finder without realizing the support that already exists in IO for FileFilters
I also have a DepthFileFilter that checks a maximum depth from a reference file thats useful for limiting navigating a directory structure, if that sounds useful.