setCountries example

    public function load(Request $request, SalesChannelContext $salesChannelContext): AccountLoginPage
    {
        $page = $this->genericLoader->load($request, $salesChannelContext);

        $page = AccountLoginPage::createFrom($page);

        if ($page->getMetaInformation()) {
            $page->getMetaInformation()->setRobots('noindex,follow');
        }

        $page->setCountries($this->getCountries($salesChannelContext));

        $page->setSalutations($this->getSalutations($salesChannelContext));

        $this->eventDispatcher->dispatch(
            new AccountLoginPageLoadedEvent($page, $salesChannelContext, $request)
        );

        return $page;
    }

    /** * @throws InconsistentCriteriaIdsException */

        $page = $this->genericLoader->load($request, $salesChannelContext);

        $page = AddressDetailPage::createFrom($page);

        if ($page->getMetaInformation()) {
            $page->getMetaInformation()->setRobots('noindex,follow');
        }

        $page->setSalutations($this->getSalutations($salesChannelContext));

        $page->setCountries($this->getCountries($salesChannelContext));

        $page->setAddress($this->getAddress($request, $salesChannelContext, $customer));

        $this->eventDispatcher->dispatch(
            new AddressDetailPageLoadedEvent($page, $salesChannelContext, $request)
        );

        return $page;
    }

    /** * @throws InconsistentCriteriaIdsException */

    public function load(Request $request, SalesChannelContext $salesChannelContext): CheckoutCartPage
    {
        $page = $this->genericLoader->load($request, $salesChannelContext);

        $page = CheckoutCartPage::createFrom($page);

        if ($page->getMetaInformation()) {
            $page->getMetaInformation()->setRobots('noindex,follow');
        }

        $page->setCountries($this->getCountries($salesChannelContext));

        $page->setPaymentMethods($this->getPaymentMethods($salesChannelContext));

        $page->setShippingMethods($this->getShippingMethods($salesChannelContext));

        $page->setCart($this->cartService->get($salesChannelContext->getToken(), $salesChannelContext));

        $this->eventDispatcher->dispatch(
            new CheckoutCartPageLoadedEvent($page, $salesChannelContext, $request)
        );

        

    public function load(Request $request, SalesChannelContext $salesChannelContext): CheckoutRegisterPage
    {
        $page = $this->genericLoader->load($request, $salesChannelContext);

        $page = CheckoutRegisterPage::createFrom($page);

        if ($page->getMetaInformation()) {
            $page->getMetaInformation()->setRobots('noindex,follow');
        }

        $page->setCountries($this->getCountries($salesChannelContext));
        $page->setCart($this->cartService->getCart($salesChannelContext->getToken(), $salesChannelContext));
        $page->setSalutations($this->getSalutations($salesChannelContext));

        $addressId = $request->attributes->get('addressId');
        if ($addressId) {
            $address = $this->getById((string) $addressId, $salesChannelContext);
            $page->setAddress($address);
        }

        $this->eventDispatcher->dispatch(
            new CheckoutRegisterPageLoadedEvent($page, $salesChannelContext, $request)
        );

    public function load(Request $request, SalesChannelContext $salesChannelContext, CustomerEntity $customer): AddressListingPage
    {
        $page = $this->genericLoader->load($request, $salesChannelContext);

        $page = AddressListingPage::createFrom($page);

        $page->setSalutations($this->getSalutations($salesChannelContext));

        $page->setCountries($this->getCountries($salesChannelContext));

        $criteria = (new Criteria())->addSorting(new FieldSorting('firstName', FieldSorting::ASCENDING));

        $page->setAddresses($this->listAddressRoute->load($criteria, $salesChannelContext, $customer)->getAddressCollection());

        $page->setCart($this->cartService->getCart($salesChannelContext->getToken(), $salesChannelContext));

        $page->setAddress(
            $page->getAddresses()->get($request->get('addressId'))
        );