/**
* @param bool $forInsertNear
* @throws Exception
*/
protected function checkNode($forInsertNear = false)
{
if ($forInsertNear && $this->node->isRoot()) {
throw new Exception('Can not move a node before/after root.');
}
if ($this->node->getIsNewRecord()) {
throw new Exception('Can not move a node when the target node is new record.');
}
if ($this->owner->equals($this->node)) {
throw new Exception('Can not move a node when the target node is same.');
}
if ($this->node->isChildOf($this->owner)) {
throw new Exception('Can not move a node when the target node is child.');
}
}
