class RoleFormController

class RoleFormController extends EntityFormController {

  /**
   * {@inheritdoc}
   */
  public function form(array $form, array &$form_state) {
    $entity = $this->entity;
    $form['label'] = array(
      '#type' => 'textfield',
      '#title' => t('Role name'),
      '#default_value' => $entity
        ->label(),
      '#size' => 30,
      '#required' => TRUE,
      '#maxlength' => 64,
      '#description' => t('The name for this role. Example: "Moderator", "Editorial board", "Site architect".'),
    );
    $form['id'] = array(
      '#type' => 'machine_name',
      '#default_value' => $entity
        ->id(),
      '#required' => TRUE,
      '#disabled' => !$entity
        ->isNew(),
      '#size' => 30,
      '#maxlength' => 64,
      '#machine_name' => array(
        'exists' => 'user_role_load',
      ),
    );
    $form['weight'] = array(
      '#type' => 'value',
      '#value' => $entity
        ->get('weight'),
    );
    return parent::form($form, $form_state, $entity);
  }

  /**
   * {@inheritdoc}
   */
  protected function actions(array $form, array &$form_state) {
    $actions = parent::actions($form, $form_state);

    // Disable delete of new and built-in roles.
    $actions['delete']['#access'] = !$this->entity
      ->isNew() && !in_array($this->entity
      ->id(), array(
      DRUPAL_ANONYMOUS_RID,
      DRUPAL_AUTHENTICATED_RID,
    ));
    return $actions;
  }

  /**
   * {@inheritdoc}
   */
  public function save(array $form, array &$form_state) {
    $entity = $this->entity;

    // Prevent leading and trailing spaces in role names.
    $entity
      ->set('label', trim($entity
      ->label()));
    $uri = $entity
      ->uri();
    if ($entity
      ->save() == SAVED_UPDATED) {
      drupal_set_message(t('Role %label has been updated.', array(
        '%label' => $entity
          ->label(),
      )));
      watchdog('user', 'Role %label has been updated.', array(
        '%label' => $entity
          ->label(),
      ), WATCHDOG_NOTICE, l(t('Edit'), $uri['path']));
    }
    else {
      drupal_set_message(t('Role %label has been added.', array(
        '%label' => $entity
          ->label(),
      )));
      watchdog('user', 'Role %label has been added.', array(
        '%label' => $entity
          ->label(),
      ), WATCHDOG_NOTICE, l(t('Edit'), $uri['path']));
    }
    $form_state['redirect'] = 'admin/people/roles';
  }

  /**
   * {@inheritdoc}
   */
  public function delete(array $form, array &$form_state) {
    $form_state['redirect'] = 'admin/people/roles/manage/' . $this->entity
      ->id() . '/delete';
  }

}