public BookNavigationCacheContext::getContext()
Returns the string representation of the cache context.
A cache context service's name is used as a token (placeholder) cache key, and is then replaced with the string returned by this method.
Return value
string The string representation of the cache context.
Overrides CacheContextInterface::getContext
File
- core/modules/book/src/Cache/BookNavigationCacheContext.php, line 54
Class
- BookNavigationCacheContext
- Defines the book navigation cache context service.
Namespace
Drupal\book\Cache
Code
public function getContext() {
// Find the current book's ID.
$current_bid = 0;
if ($node = $this->requestStack->getCurrentRequest()->get('node')) {
$current_bid = empty($node->book['bid']) ? 0 : $node->book['bid'];
}
// If we're not looking at a book node, then we're not navigating a book.
if ($current_bid === 0) {
return 'book.none';
}
// If we're looking at a book node, get the trail for that node.
$active_trail = $this->container->get('book.manager')
->getActiveTrailIds($node->book['bid'], $node->book);
return implode('|', $active_trail);
}
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