/**
* Returns the collection of routes in the source.
*
* @return RouterInterface
* The requested link collection.
*/
public function getSourceRoutes()
{
if (empty($this->sourceRoutes)) {
$this->sourceRoutes = new Drupal7Router();
$items = call_user_func($this->target->id() . '_menu');
foreach ($items as $path => $item) {
$this->sourceRoutes->addRoute(new Drupal7Route($path, $item));
}
// Now that all routes have been loaded, tell them to resolve their
// hierarchical relationships.
$this->sourceRoutes->finalize();
}
return $this->sourceRoutes;
}
