/**
* Receive update from subject
* @link http://php.net/manual/en/splobserver.update.php
* @param \SplSubject $elevator <p>
* The <b>SplSubject</b> notifying the observer of an update.
* </p>
* @return void
* @since 5.1.0
*/
public function update(\SplSubject $elevator)
{
if ($elevator instanceof Elevator) {
if (-1 === $elevator->getFloor()) {
if (null === $this->instructionPosition) {
$this->instructionPosition = $this->parser->getInstructionPosition();
}
}
}
}
