getFormatOptions example

/** * {@inheritdoc} */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    parent::buildOptionsForm($form, $form_state);

    $form['formats'] = [
      '#type' => 'checkboxes',
      '#title' => $this->t('Accepted request formats'),
      '#description' => $this->t('Request formats that will be allowed in responses. If none are selected all formats will be allowed.'),
      '#options' => $this->getFormatOptions(),
      '#default_value' => $this->options['formats'],
    ];
  }

  /** * {@inheritdoc} */
  public function submitOptionsForm(&$form, FormStateInterface $form_state) {
    parent::submitOptionsForm($form, $form_state);

    $formats = $form_state->getValue(['style_options', 'formats']);
    

if ($route = $collection->get("view.$view_id.$display_id")) {
      $style_plugin = $this->getPlugin('style');

      // REST exports should only respond to GET methods.       $route->setMethods(['GET']);

      $formats = $style_plugin->getFormats();

      // If there are no configured formats, add all formats that serialization       // is known to support.       if (!$formats) {
        $formats = $this->getFormatOptions();
      }

      // Format as a string using pipes as a delimiter.       $route->setRequirement('_format', implode('|', $formats));

      // Add authentication to the route if it was set. If no authentication was       // set, the default authentication will be used, which is cookie based by       // default.       $auth = $this->getOption('auth');
      if (!empty($auth)) {
        $route->setOption('_auth', $auth);
      }