/**
* Lists the subdirectories inside a directory
*
* @param null|string $dir The directory to scan. Skip to use the current directory.
*
* @return array|bool A list of folders, or false if we could not get a listing
*
* @throws \RuntimeException When the server is incompatible with our folder scanner
*/
public function listFolders($dir = null)
{
try {
// First try using a direct access
$list = $this->fileAdapter->listFolders($dir);
} catch (\RuntimeException $e) {
if (!is_object($this->abstractionAdapter)) {
// If we failed and there is no abstraction adapter rethrow the exception
throw $e;
} else {
// Also try using the abstraction adapter
$list = $this->abstractionAdapter->listFolders($dir);
}
}
return $list;
}
