MenuTreeStorage::preSave

protected MenuTreeStorage::preSave(array &$link, array $original)

protected function preSave(array &$link, array $original) {
  static $schema_fields, $schema_defaults;
  if (empty($schema_fields)) {
    $schema = static::schemaDefinition();
    $schema_fields = $schema['fields'];
    foreach ($schema_fields as $name => $spec) {
      if (isset($spec['default'])) {
        $schema_defaults[$name] = $spec['default'];
      }
    }
  }

  // Try to find a parent link. If found, assign it and derive its menu.
  $parent = $this->findParent($link, $original);
  if ($parent) {
    $link['parent'] = $parent['id'];
    $link['menu_name'] = $parent['menu_name'];
  }
  else {
    $link['parent'] = '';
  }

  // If no corresponding parent link was found, move the link to the
  // top-level.
  foreach ($schema_defaults as $name => $default) {
    if (!isset($link[$name])) {
      $link[$name] = $default;
    }
  }
  $fields = array_intersect_key($link, $schema_fields);
  // Sort the route parameters so that the query string will be the same.
  asort($fields['route_parameters']);
  // Since this will be urlencoded, it's safe to store and match against a
  // text field.
  $fields['route_param_key'] = $fields['route_parameters'] ? UrlHelper::buildQuery($fields['route_parameters']) : '';

  foreach ($this->serializedFields() as $name) {
    if (isset($fields[$name])) {
      $fields[$name] = serialize($fields[$name]);
    }
  }
  $this->setParents($fields, $parent, $original);

  // Need to check both parent and menu_name, since parent can be empty in any
  // menu.
  if ($original && ($link['parent'] != $original['parent'] || $link['menu_name'] != $original['menu_name'])) {
    $this->moveChildren($fields, $original);
  }
  // We needed the mlid above, but not in the update query.
  unset($fields['mlid']);

  // Cast Booleans to int, if needed.
  $fields['enabled'] = (int) $fields['enabled'];
  $fields['expanded'] = (int) $fields['expanded'];
  return $fields;
}