/**
* Create a LockTocken from a string
*
* @param string str
* @return util.webdav.LockTocken
* @throws lang.FormatException in case the string is not a valid opaquelocktoken
*/
public static function fromString($str)
{
list($prefix, $uuidstr) = explode(':', $str, 2);
if (LOCKTOKEN_PREFIX !== $prefix || FALSE === ($uuid = UUID::fromString($uuidstr))) {
throw new FormatException($str . ' is not a valid opaquelocktoken string');
}
return new OpaqueLockTocken($uuid);
}