private static IOFileFilter setUpEffectiveDirFilter(IOFileFilter dirFilter) {
return dirFilter == null
? FalseFileFilter.INSTANCE
: FileFilterUtils.and(new IOFileFilter[] {dirFilter, DirectoryFileFilter.INSTANCE});
}
private static IOFileFilter setUpEffectiveFileFilter(IOFileFilter fileFilter) {
return FileFilterUtils.and(
new IOFileFilter[] {
fileFilter, FileFilterUtils.notFileFilter(DirectoryFileFilter.INSTANCE)
});
}