/**
* @param NodeInterface $parent
*
* @return $this
*/
public function setParent(NodeInterface $parent = null)
{
if ($this->parent === $parent) {
return $this;
}
if ($parent !== null && $this->parent && $this->parent->hasChild($this)) {
$this->parent->removeChild($this);
return $this;
}
$this->parent = $parent;
if ($parent !== null && !$parent->hasChild($this)) {
$parent->appendChild($this);
}
return $this;
}