/**
* @throws Exception
*/
public function beforeUpdate()
{
if ($this->node !== null && !$this->node->getIsNewRecord()) {
$this->node->refresh();
}
switch ($this->operation) {
case self::OPERATION_MAKE_ROOT:
if ($this->treeAttribute === false) {
throw new Exception('Can not move a node as the root when "treeAttribute" is false.');
}
if ($this->owner->isRoot()) {
throw new Exception('Can not move the root node as the root.');
}
break;
case self::OPERATION_INSERT_BEFORE:
case self::OPERATION_INSERT_AFTER:
if ($this->node->isRoot()) {
throw new Exception('Can not move a node when the target node is root.');
}
case self::OPERATION_PREPEND_TO:
case self::OPERATION_APPEND_TO:
if ($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.');
}
}
}
