/**
* Get top level NavigationInterface instance
*
* @return NavigationInterface|null
*/
public function getNavigation()
{
if ($this->_parentContainer instanceof NavigationInterface) {
return $this->_parentContainer;
} elseif ($this->_parentContainer instanceof Item) {
return $this->_parentContainer->getNavigation();
}
return null;
}
/**
* {@inheritdoc}
*/
public function addElement(NavigationInterface $element)
{
$id = $element->getId();
if (isset($this->elements[$id])) {
throw new \LogicException(sprintf('Navigation with ID: "%s" already exists', $id));
}
$this->elements[$id] = $element;
return $this;
}