@@ -0,0 +1,1864 @@
+// Copyright 2019 Google LLC%0A//%0A// Licensed under the Apache License, Version 2.0 (the %22License%22);%0A// you may not use this file except in compliance with the License.%0A// You may obtain a copy of the License at%0A//%0A//     https://www.apache.org/licenses/LICENSE-2.0%0A//%0A// Unless required by applicable law or agreed to in writing, software%0A// distributed under the License is distributed on an %22AS IS%22 BASIS,%0A// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A// See the License for the specific language governing permissions and%0A// limitations under the License.%0A%0Apackage com.google.sps.servlets;%0A%0Aimport com.google.gson.Gson;%0Aimport com.google.sps.data.User;%0Aimport java.io.IOException;%0Aimport javax.servlet.annotation.WebServlet;%0Aimport javax.servlet.http.HttpServlet;%0Aimport javax.servlet.http.HttpServletRequest;%0Aimport javax.servlet.http.HttpServletResponse;%0A%0A/**%0A * provides get method for adding a recipe ID to one of the three User recipe lists.%0A * request parameters: %22destination%22, %22inputID%22%0A * %22destination%22 may be one of three user recipe list: %22cookbook%22, %22userRecipes%22, %22planner%22.%0A * %22inputID%22 must be the recipe ID to be added.%0A */%0A@WebServlet(%22/user-action%22)%0Apublic class UserActionServlet extends HttpServlet %7B%0A%0A  @Override%0A  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException %7B%0A    String destination = (String) request.getParameter(%22destination%22);%0A    long ID = Long.parse((String) request.getParameter(%22inputID%22));%0A    %0A    // Must be changed to implement distinct users with sign-in API.%0A    User user = User.getTestUser();%0A%0A    if (destination == %22cookbook%22) %7B%0A      user.addRecipeToCookbook(ID);%0A    %7D else if (destination == %22userRecipes%22) %7B%0A      user.addRecipeToUserRecipes(ID);%0A    %7D else if (destination == %22planner%22) %7B%0A      user.addRecipeToPlanner(ID);%0A    %7D%0A  %7D%0A%7D%0A

implement servlet with get method for adding recipe IDs to User lists