class EntityTestFormController

class EntityTestFormController extends EntityFormControllerNG {

  /**
   * Overrides Drupal\Core\Entity\EntityFormController::form().
   */
  public function form(array $form, array &$form_state, EntityInterface $entity) {
    $form = parent::form($form, $form_state, $entity);
    $langcode = $this
      ->getFormLangcode($form_state);
    $translation = $entity
      ->getTranslation($langcode);
    $form['name'] = array(
      '#type' => 'textfield',
      '#title' => t('Name'),
      '#default_value' => $translation->name->value,
      '#size' => 60,
      '#maxlength' => 128,
      '#required' => TRUE,
      '#weight' => -10,
    );
    $form['user_id'] = array(
      '#type' => 'textfield',
      '#title' => 'UID',
      '#default_value' => $translation->user_id->value,
      '#size' => 60,
      '#maxlength' => 128,
      '#required' => TRUE,
      '#weight' => -10,
    );
    $form['langcode'] = array(
      '#title' => t('Language'),
      '#type' => 'language_select',
      '#default_value' => $entity
        ->language()->langcode,
      '#languages' => LANGUAGE_ALL,
    );
    return $form;
  }

  /**
   * Overrides Drupal\Core\Entity\EntityFormController::save().
   */
  public function save(array $form, array &$form_state) {
    $entity = $this
      ->getEntity($form_state);
    $is_new = $entity
      ->isNew();
    $entity
      ->save();
    $message = $is_new ? t('entity_test @id has been created.', array(
      '@id' => $entity
        ->id(),
    )) : t('entity_test @id has been updated.', array(
      '@id' => $entity
        ->id(),
    ));
    drupal_set_message($message);
    if ($entity
      ->id()) {
      $form_state['redirect'] = 'entity-test/manage/' . $entity
        ->id() . '/edit';
    }
    else {

      // Error on save.
      drupal_set_message(t('The entity could not be saved.'), 'error');
      $form_state['rebuild'] = TRUE;
    }
  }

  /**
   * Overrides Drupal\Core\Entity\EntityFormController::delete().
   */
  public function delete(array $form, array &$form_state) {
    $entity = $this
      ->getEntity($form_state);
    $entity
      ->delete();
    drupal_set_message(t('entity_test @id has been deleted.', array(
      '@id' => $entity
        ->id(),
    )));
    $form_state['redirect'] = '<front>';
  }

}