function MenuTreeStorage::rebuild

File

core/lib/Drupal/Core/Menu/MenuTreeStorage.php, line 119

Class

MenuTreeStorage

Provides a menu tree storage using the database.

Namespace

Code

public function rebuild(array $definitions) {
    $links = [];
    $children = [];
    $top_links = [];
    // Fetch the list of existing menus, in case some are not longer populated
    // after the rebuild.
    $before_menus = $this->getMenuNames();
    if ($definitions) {
        foreach ($definitions as $id => $link) {
            // Flag this link as discovered, i.e. saved via rebuild().
            $link['discovered'] = 1;
            // Note: The parent we set here might be just stored in the {menu_tree}
            // table, so it will not end up in $top_links. Therefore the later loop
            // on the orphan links, will handle those cases.
            if (!empty($link['parent'])) {
                $children[$link['parent']][$id] = $id;
            }
            else {
                // A top level link - we need them to root our tree.
                $top_links[$id] = $id;
                $link['parent'] = '';
            }
            $links[$id] = $link;
        }
    }
    foreach ($top_links as $id) {
        $this->saveRecursive($id, $children, $links);
    }
    // Handle any children we didn't find starting from top-level links.
    foreach ($children as $orphan_links) {
        foreach ($orphan_links as $id) {
            // Check for a parent that is not loaded above since only internal links
            // are loaded above.
            $parent = $this->loadFull($links[$id]['parent']);
            // If there is a parent add it to the links to be used in
            // ::saveRecursive().
            if ($parent) {
                $links[$links[$id]['parent']] = $parent;
            }
            else {
                // Force it to the top level.
                $links[$id]['parent'] = '';
            }
            $this->saveRecursive($id, $children, $links);
        }
    }
    $result = $this->findNoLongerExistingLinks($definitions);
    // Remove all such items.
    if ($result) {
        $this->purgeMultiple($result);
    }
    $this->resetDefinitions();
    $affected_menus = $this->getMenuNames() + $before_menus;
    // Invalidate any cache tagged with any menu name.
    $cache_tags = Cache::buildTags('config:system.menu', $affected_menus, '.');
    $this->cacheTagsInvalidator
        ->invalidateTags($cache_tags);
    $this->resetDefinitions();
    // Every item in the cache bin should have one of the menu cache tags but it
    // is not guaranteed, so invalidate everything in the bin.
    $this->menuCacheBackend
        ->invalidateAll();
}