LanguageAccessControlHandler.php

<?php

namespace Drupal\language;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Entity\EntityAccessControlHandler;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Session\AccountInterface;

/**
 * Defines the access control handler for the language entity type.
 *
 * @see \Drupal\language\Entity\ConfigurableLanguage
 */
class LanguageAccessControlHandler extends EntityAccessControlHandler {
    
    /**
     * {@inheritdoc}
     */
    protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
        switch ($operation) {
            case 'view':
                return parent::checkAccess($entity, $operation, $account);
            case 'update':
                
                /** @var \Drupal\Core\Language\LanguageInterface $entity */
                return AccessResult::allowedIf(!$entity->isLocked())
                    ->addCacheableDependency($entity)
                    ->andIf(parent::checkAccess($entity, $operation, $account));
            case 'delete':
                
                /** @var \Drupal\Core\Language\LanguageInterface $entity */
                return AccessResult::allowedIf(!$entity->isLocked())
                    ->addCacheableDependency($entity)
                    ->andIf(AccessResult::allowedIf(!$entity->isDefault())
                    ->addCacheableDependency($entity))
                    ->andIf(parent::checkAccess($entity, $operation, $account));
            default:
                // No opinion.
                return AccessResult::neutral();
        }
    }

}