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<?php
/**
* @file
* Contains \Drupal\book\BookUninstallValidator.
*/
namespace Drupal\book;
use Drupal\Core\Entity\Query\QueryFactory;
use Drupal\Core\Extension\ModuleUninstallValidatorInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\StringTranslation\TranslationInterface;
/**
* Prevents book module from being uninstalled whilst any book nodes exist or
* there are any book outline stored.
*/
class BookUninstallValidator implements ModuleUninstallValidatorInterface {
use StringTranslationTrait;
/**
* The book outline storage.
*
* @var \Drupal\book\BookOutlineStorageInterface
*/
protected $bookOutlineStorage;
/**
* The entity query for node.
*
* @var \Drupal\Core\Entity\Query\QueryInterface
*/
protected $entityQuery;
/**
* Constructs a new BookUninstallValidator.
*
* @param \Drupal\book\BookOutlineStorageInterface $book_outline_storage
* The book outline storage.
* @param \Drupal\Core\Entity\Query\QueryFactory $query_factory
* The entity query factory.
* @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
* The string translation service.
*/
public function __construct(BookOutlineStorageInterface $book_outline_storage, QueryFactory $query_factory, TranslationInterface $string_translation) {
$this->bookOutlineStorage = $book_outline_storage;
$this->entityQuery = $query_factory->get('node');
$this->stringTranslation = $string_translation;
}
/**
* {@inheritdoc}
*/
public function validate($module) {
$reasons = [];
if ($module == 'book') {
if ($this->hasBookOutlines()) {
$reasons[] = $this->t('To uninstall Book, delete all content that is part of a book');
}
else {
// The book node type is provided by the Book module. Prevent uninstall
// if there are any nodes of that type.
if ($this->hasBookNodes()) {
$reasons[] = $this->t('To uninstall Book, delete all content that has the Book content type');
}
}
}
return $reasons;
}
/**
* Checks if there are any books in an outline.
*
* @return bool
* TRUE if there are books, FALSE if not.
*/
protected function hasBookOutlines() {
return $this->bookOutlineStorage->hasBooks();
}
/**
* Determines if there is any book nodes or not.
*
* @return bool
* TRUE if there are book nodes, FALSE otherwise.
*/
protected function hasBookNodes() {
$nodes = $this->entityQuery
->condition('type', 'book')
->accessCheck(FALSE)
->range(0, 1)
->execute();
return !empty($nodes);
}
}