class DblogClearLogConfirmForm

class DblogClearLogConfirmForm extends ConfirmFormBase {
  
  /**
   * The database connection.
   *
   * @var \Drupal\Core\Database\Connection
   */
  protected $connection;
  
  /**
   * Constructs a new DblogClearLogConfirmForm.
   *
   * @param \Drupal\Core\Database\Connection $connection
   *   The database connection.
   */
  public function __construct(Connection $connection) {
    $this->connection = $connection;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('database'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'dblog_confirm';
  }
  
  /**
   * {@inheritdoc}
   */
  public function getQuestion() {
    return $this->t('Are you sure you want to delete the recent logs?');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCancelUrl() {
    return new Url('dblog.overview');
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $this->getRequest()
      ->getSession()
      ->remove('dblog_overview_filter');
    $this->connection
      ->truncate('watchdog')
      ->execute();
    $this->messenger()
      ->addStatus($this->t('Database log cleared.'));
    $form_state->setRedirectUrl($this->getCancelUrl());
  }

}