menu-feed/java/src/main/java/com/example/Feed.java

package com.example;

import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.Timestamp;
import com.google.type.Money;
import com.google.protobuf.util.JsonFormat;
import com.google.type.LocalizedText;
import food.menu.v1.FoodMenu.FoodMenuFeed;
import food.menu.v1.FoodMenu.Menu;
import food.menu.v1.FoodMenu.MenuComponent;
import food.menu.v1.FoodMenu.MenuItem;
import food.menu.v1.FoodMenu.MenuSection;
import food.menu.v1.FoodMenu.TextField;
import food.menu.v1.FoodMenu.MenuItemOption;
import food.menu.v1.FoodMenu.MenuItemOptionProperty;
import food.menu.v1.FoodMenu.OfferSet;
import food.menu.v1.FoodMenu.Offer;

/**
 * Menu feed example used in
 *
 * <p>https://developers.google.com/maps-booking/verticals/dining/guides/tutorials/tutorial-menu-feed-protos#java.
 */
public class Feed {

  public static void main(String[] args) throws InvalidProtocolBufferException {
    Feed feed = new Feed();
    feed.createMenuFeed();
  }

  public void createMenuFeed() throws InvalidProtocolBufferException {

    Menu.Builder menu =
        Menu.newBuilder()
            .setMenuId("menu1")
            .addMerchantIds("dining-1")
            .setDisplayName(
                TextField.newBuilder()
                    .addText(LocalizedText.newBuilder().setText("Menu").setLanguageCode("en-us")))
            .setLanguage("en-us")
            .setLastMerchantUpdateTime(Timestamp.newBuilder().setSeconds(1633621547));

    MenuSection.Builder section =
        MenuSection.newBuilder()
            .setMenuSectionId("appetizers")
            .setDisplayName(
                TextField.newBuilder()
                    .addText(
                        LocalizedText.newBuilder()
                            .setText("Lunch Appetizers")
                            .setLanguageCode("en-us")))
            .addMenuItemIds("breadsticks-sauce");

    MenuItem.Builder item =
        MenuItem.newBuilder()
            .setMenuItemId("breadsticks-sauce")
            .setDisplayName(
                TextField.newBuilder()
                    .addText(
                        LocalizedText.newBuilder()
                            .setText("Breadsticks & Sauce")
                            .setLanguageCode("en-us")))
            .setDescription(
                TextField.newBuilder()
                    .addText(
                        LocalizedText.newBuilder()
                            .setText("Breadsticks & Sauce")
                            .setLanguageCode("en-us")));

    MenuItemOption.Builder option =
        MenuItemOption.newBuilder()
          .setMenuItemOptionId("breadstick-sm")
          .setValue(
              MenuItemOptionProperty.newBuilder()
                .setPropertyType(MenuItemOptionProperty.PropertyType.SIZE)
                .setTextVal(TextField.newBuilder()
                    .addText(
                        LocalizedText.newBuilder()
                            .setText("Small")
                            .setLanguageCode("en-us"))))
          .setOfferSet(
              OfferSet.newBuilder()
                .addOffers(
                    Offer.newBuilder()
                      .setPrice(
                          Money.newBuilder()
                            .setCurrencyCode("USD")
                            .setUnits(8)
                            .setNanos(0))));

    FoodMenuFeed.Builder foodMenuFeed =
        FoodMenuFeed.newBuilder()
            .addData(MenuComponent.newBuilder().setMenu(menu))
            .addData(MenuComponent.newBuilder().setSection(section))
            .addData(MenuComponent.newBuilder().setItem(item))
            .addData(MenuComponent.newBuilder().setOption(option));

    String feedJSON =
        JsonFormat.printer()
            .omittingInsignificantWhitespace()
            .preservingProtoFieldNames()
            .print(foodMenuFeed);

    System.out.println(feedJSON);
  }
}