CartController.java

package cart;

import common.contexts.UserContext;
import common.controllers.ControllerDependency;
import common.controllers.SunriseController;
import io.sphere.sdk.carts.Cart;
import io.sphere.sdk.carts.CartDraft;
import io.sphere.sdk.carts.commands.CartCreateCommand;
import io.sphere.sdk.carts.commands.CartUpdateCommand;
import io.sphere.sdk.carts.commands.updateactions.SetShippingAddress;
import io.sphere.sdk.carts.queries.CartByIdGet;
import io.sphere.sdk.models.Address;
import play.libs.F;
import play.mvc.Http;

import java.util.Optional;

public abstract class CartController extends SunriseController {
    public CartController(final ControllerDependency controllerDependency) {
        super(controllerDependency);
    }

    protected F.Promise<Cart> getOrCreateCart(final UserContext userContext, final Http.Session session) {
        return Optional.ofNullable(session(CartSessionKeys.CART_ID))
                .map(cartId -> sphere().execute(CartByIdGet.of(cartId)))
                .orElseGet(() -> sphere().execute(CartCreateCommand.of(CartDraft.of(userContext.currency()).withCountry(userContext.country())))
                        .flatMap(cart -> {
                            //required to show the taxes
                            final Address address = Address.of(userContext.country());
                            return sphere().execute(CartUpdateCommand.of(cart, SetShippingAddress.of(address)));
                        }))
                .map(cart -> {
                    CartSessionUtils.overwriteCartSessionData(cart, session);
                    return cart;
                });
    }

}