protected function getHash()
	{
		@trigger_error('Using Folder::getHash() has been deprecated and will no longer work in Contao 5.0. Use Dbafs::getFolderHash() instead.', E_USER_DEPRECATED);

		$arrFiles = array();

		/** @var \SplFileInfo[] $it */
		$it = new \RecursiveIteratorIterator(
			new \RecursiveDirectoryIterator(
				$this->strRootDir . '/' . $this->strFolder,
				\FilesystemIterator::UNIX_PATHS|\FilesystemIterator::FOLLOW_SYMLINKS|\FilesystemIterator::SKIP_DOTS
			), \RecursiveIteratorIterator::SELF_FIRST
		);

		foreach ($it as $i)
		{
			if (strncmp($i->getFilename(), '.', 1) !== 0)
			{
				$arrFiles[] = substr($i->getPathname(), \strlen($this->strRootDir . '/' . $this->strFolder . '/'));
			}
		}

		return md5(implode('-', $arrFiles));
	}