/**
* Check if this node can be moved under another parent.
*
* @param Node $newParent The new parent node.
*
* @return MoveException|null Return a MoveException in case of problems, null in case of success.
*/
public function checkMove(Node $newParent)
{
$result = null;
if ($this->getTreeNodeParentID() != $newParent->getTreeNodeID()) {
if ($this->getTreeNodeID() == $newParent->getTreeNodeID()) {
$result = new MoveException(t("It's not possible to move a node under itself"));
} else {
foreach ($newParent->getTreeNodeParentArray() as $newParentAncestor) {
if ($newParentAncestor->getTreeNodeID() == $this->getTreeNodeID()) {
$result = MoveException(t("It's not possible to move a node under one of its descending nodes"));
break;
}
}
}
}
return $result;
}
