class ContactDeleteForm

class ContactDeleteForm extends ContentEntityConfirmFormBase {
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() {
        return $this->t('Are you sure you want to delete entity %name?', [
            '%name' => $this->entity
                ->label(),
        ]);
    }
    
    /**
     * {@inheritdoc}
     *
     * If the delete command is canceled, return to the contact list.
     */
    public function getCancelUrl() {
        return new Url('entity.content_entity_example_contact.collection');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() {
        return $this->t('Delete');
    }
    
    /**
     * {@inheritdoc}
     *
     * Delete the entity and log the event. logger() replaces the watchdog.
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $entity = $this->getEntity();
        $entity->delete();
        $this->logger('content_entity_example')
            ->notice('@type: deleted %title.', [
            '@type' => $this->entity
                ->bundle(),
            '%title' => $this->entity
                ->label(),
        ]);
        $form_state->setRedirect('entity.content_entity_example_contact.collection');
    }

}