/**
* Sets the parent node.
*
* @param AbstractNode $parent
* @return $this
* @throws CircularException
*/
public function setParent(AbstractNode $parent)
{
// check integrity
if ($this->isDescendant($parent->id())) {
throw new CircularException('Can not add descendant "' . $parent->id() . '" as my parent.');
}
// remove from old parent
if (!is_null($this->parent)) {
if ($this->parent->id() == $parent->id()) {
// already the parent
return $this;
}
$this->parent->removeChild($this->id);
}
$this->parent = $parent;
// assign child to parent
$this->parent->addChild($this);
//clear any cache
$this->clear();
return $this;
}
