public function submitForm(array &$form, FormStateInterface $form_state) {
$form_state->cleanValues();
/** @var \Drupal\fillpdf\FillPdfFormInterface $fillpdf_form */
$fillpdf_form = $this->getEntity();
$mappings = $form_state->getValue('mappings');
/** @var \Drupal\fillpdf\FillPdfFormInterface $imported_form */
$imported_form = $mappings['form'];
/** @var array $imported_fields */
$imported_fields = $mappings['fields'];
$unmatched_pdf_keys = $this->serializer->importForm($fillpdf_form, $imported_form, $imported_fields);
foreach ($unmatched_pdf_keys as $unmatched_pdf_key) {
drupal_set_message($this->t('Your code contained field mappings for the PDF field key <em>@pdf_key</em>, but it does not exist on this form. Therefore, it was ignored.', ['@pdf_key' => $unmatched_pdf_key]), 'warning');
}
drupal_set_message($this->t('Successfully imported FillPDF form configuration and matching PDF field keys. If any field mappings failed to import, they are listed above.'));
$form_state->setRedirect('entity.fillpdf_form.edit_form', ['fillpdf_form' => $fillpdf_form->id()]);
}
