class DeleteForm

class DeleteForm extends ContentEntityDeleteForm {
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() {
        // Point to the entity of which this comment is a reply.
        return $this->entity
            ->get('entity_id')->entity
            ->toUrl();
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getRedirectUrl() {
        return $this->getCancelUrl();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDescription() {
        return $this->t('Any replies to this comment will be lost. This action cannot be undone.');
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getDeletionMessage() {
        return $this->t('The comment and all its replies have been deleted.');
    }
    
    /**
     * {@inheritdoc}
     */
    public function logDeletionMessage() {
        $this->logger('comment')
            ->info('Deleted comment @cid and its replies.', [
            '@cid' => $this->entity
                ->id(),
        ]);
    }

}