/**
* @param $fromIndex
* @param $toIndex
* @param Step[] $steps
* @throws \Exception
*/
private function stepDown($fromIndex, $toIndex, $steps)
{
for ($i = $fromIndex; $i > $toIndex; $i--) {
if (!$steps[$i]->canBeUndone()) {
throw new \Exception('Cannot migrate down. Step [' . get_class($steps[$i]) . '] cannot be undone.');
}
}
for ($i = $fromIndex; $i > $toIndex; $i--) {
$this->dispatcher->fire(new MigrateDownEvent($steps[$i]));
$steps[$i]->down();
}
}
protected function fire(CollectionEvent $event)
{
if ($this->dispatcher) {
$this->dispatcher->fire($event);
}
}
private function whenIFire($event)
{
$this->dispatcher->fire(new $event());
}