FeedForm.php

<?php

namespace Drupal\aggregator;

use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Link;
use Drupal\Core\Url;

/**
 * Form handler for the aggregator feed edit forms.
 *
 * @internal
 */
class FeedForm extends ContentEntityForm {
    
    /**
     * {@inheritdoc}
     */
    public function save(array $form, FormStateInterface $form_state) {
        $feed = $this->entity;
        $status = $feed->save();
        $label = $feed->label();
        $view_link = $feed->toLink($label, 'canonical')
            ->toString();
        if ($status == SAVED_UPDATED) {
            $this->messenger()
                ->addStatus($this->t('The feed %feed has been updated.', [
                '%feed' => $view_link,
            ]));
            $form_state->setRedirectUrl($feed->toUrl('canonical'));
        }
        else {
            $this->logger('aggregator')
                ->notice('Feed %feed added.', [
                '%feed' => $feed->label(),
                'link' => Link::fromTextAndUrl($this->t('View'), new Url('aggregator.admin_overview'))
                    ->toString(),
            ]);
            $this->messenger()
                ->addStatus($this->t('The feed %feed has been added.', [
                '%feed' => $view_link,
            ]));
        }
    }

}