public function findAll()
    {
        return new CallbackMapIterator(
            new FilesystemIterator(
                $this->getSavePath(),
                FilesystemIterator::SKIP_DOTS |
                FilesystemIterator::KEY_AS_FILENAME |
                FilesystemIterator::CURRENT_AS_FILEINFO
            ),
            function ( SplFileInfo $info ) {
                return $info->getFilename();
            }
        );
    }