MenuTreeStorage::findParent

protected MenuTreeStorage::findParent($link, $original)

protected function findParent($link, $original) {
  $parent = FALSE;

  // This item is explicitly top-level, skip the rest of the parenting.
  if (isset($link['parent']) && empty($link['parent'])) {
    return $parent;
  }

  // If we have a parent link ID, try to use that.
  $candidates = array();
  if (isset($link['parent'])) {
    $candidates[] = $link['parent'];
  }
  elseif (!empty($original['parent']) && $link['menu_name'] == $original['menu_name']) {
    // Otherwise, fall back to the original parent.
    $candidates[] = $original['parent'];
  }

  foreach ($candidates as $id) {
    $parent = $this->loadFull($id);
    if ($parent) {
      break;
    }
  }
  return $parent;
}