class Role

1. 8.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/access/Role.php \Drupal\user\Plugin\views\access\Role
2. 8.x drupal/core/modules/user/lib/Drupal/user/Plugin/Core/Entity/Role.php \Drupal\user\Plugin\Core\Entity\Role

AccessRoleTest.php in drupal/core/modules/user/lib/Drupal/user/Tests/Views/AccessRoleTest.php

Contains \Drupal\user\Tests\Views\AccessRoleTest.

block.schema.yml in drupal/core/modules/block/config/schema/block.schema.yml

drupal/core/modules/block/config/schema/block.schema.yml

ChangeUserRoleBase::form in drupal/core/modules/user/lib/Drupal/user/Plugin/Action/ChangeUserRoleBase.php

Form constructor.

filter.schema.yml in drupal/core/modules/filter/config/schema/filter.schema.yml

drupal/core/modules/filter/config/schema/filter.schema.yml

Role::buildOptionsForm in drupal/core/modules/user/lib/Drupal/user/Plugin/views/access/Role.php

Provide the default form for setting options.

SimpleTestTest::confirmStubTestResults in drupal/core/modules/simpletest/lib/Drupal/simpletest/Tests/SimpleTestTest.php

Confirm that the stub test produced the desired results.

... See full list

class Role extends AccessPluginBase {

  /**
   * Overrides Drupal\views\Plugin\Plugin::$usesOptions.
   */
  protected $usesOptions = TRUE;

  /**
   * {@inheritdoc}
   */
  public function access(AccountInterface $account) {
    return user_access('access all views', $account) || array_intersect(array_filter($this->options['role']), $account->roles);
  }

  /**
   * {@inheritdoc}
   */
  public function alterRouteDefinition(Route $route) {
    $route
      ->setRequirement('_role_id', $this->options['role']);
  }
  public function summaryTitle() {
    $count = count($this->options['role']);
    if ($count < 1) {
      return t('No role(s) selected');
    }
    elseif ($count > 1) {
      return t('Multiple roles');
    }
    else {
      $rids = user_role_names();
      $rid = reset($this->options['role']);
      return check_plain($rids[$rid]);
    }
  }
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['role'] = array(
      'default' => array(),
    );
    return $options;
  }
  public function buildOptionsForm(&$form, &$form_state) {
    parent::buildOptionsForm($form, $form_state);
    $form['role'] = array(
      '#type' => 'checkboxes',
      '#title' => t('Role'),
      '#default_value' => $this->options['role'],
      '#options' => array_map('check_plain', $this
        ->getRoles()),
      '#description' => t('Only the checked roles will be able to access this display. Note that users with "access all views" can see any view, regardless of role.'),
    );
  }
  public function validateOptionsForm(&$form, &$form_state) {
    if (!array_filter($form_state['values']['access_options']['role'])) {
      form_error($form['role'], t('You must select at least one role if type is "by role"'));
    }
  }
  public function submitOptionsForm(&$form, &$form_state) {

    // I hate checkboxes.
    $form_state['values']['access_options']['role'] = array_filter($form_state['values']['access_options']['role']);
  }

}