public BookManager::bookSubtreeData($link)
Gets the data representing a subtree of the book hierarchy.
The root of the subtree will be the link passed as a parameter, so the returned tree will contain this item and all its descendants in the menu tree.
Parameters
array $link: A fully loaded book link.
Return value
A subtree of book links in an array, in the order they should be rendered.
Overrides BookManagerInterface::bookSubtreeData
File
- core/modules/book/src/BookManager.php, line 1082
Class
- BookManager
- Defines a book manager.
Namespace
Drupal\book
Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | public function bookSubtreeData($link) { $tree = &drupal_static(__METHOD__, array()); // Generate a cache ID (cid) specific for this $link. $cid = 'book-links:subtree-cid:' . $link['nid']; if (!isset($tree[$cid])) { $tree_cid_cache = \Drupal::cache('data')->get($cid); if ($tree_cid_cache && $tree_cid_cache->data) { // If the cache entry exists, it will just be the cid for the actual // data. This avoids duplication of large amounts of data. $cache = \Drupal::cache('data')->get($tree_cid_cache->data); if ($cache && isset($cache->data)) { $data = $cache->data; } } // If the subtree data was not in the cache, $data will be NULL. if (!isset($data)) { $result = $this->bookOutlineStorage->getBookSubtree($link, static::BOOK_MAX_DEPTH); $links = array(); foreach ($result as $item) { $links[] = $item; } $data['tree'] = $this->buildBookOutlineData($links, array(), $link['depth']); $data['node_links'] = array(); $this->bookTreeCollectNodeLinks($data['tree'], $data['node_links']); // Compute the real cid for book subtree data. $tree_cid = 'book-links:subtree-data:' . hash('sha256', serialize($data)); // Cache the data, if it is not already in the cache. if (!\Drupal::cache('data')->get($tree_cid)) { \Drupal::cache('data')->set($tree_cid, $data, Cache::PERMANENT, array('bid:' . $link['bid'])); } // Cache the cid of the (shared) data using the book and item-specific // cid. \Drupal::cache('data')->set($cid, $tree_cid, Cache::PERMANENT, array('bid:' . $link['bid'])); } // Check access for the current user to each item in the tree. $this->bookTreeCheckAccess($data['tree'], $data['node_links']); $tree[$cid] = $data['tree']; } return $tree[$cid];} |
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