content: /*
   * Copyright 2016-2020 Andres Almiray
   *
   * This file is part of Java Trove Examples
   *
   * Java Trove Examples is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * Java Trove Examples is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with Java Trove Examples. If not, see <http://www.gnu.org/licenses/>.
   */
  package org.kordamp.javatrove.todo01.spark;
  
  import com.fasterxml.jackson.databind.ObjectMapper;
  import spark.ModelAndView;
  import spark.Request;
  import spark.Response;
  import spark.Route;
  import spark.template.mustache.MustacheTemplateEngine;
  
  import javax.inject.Inject;
  
  /**
   * @author Andres Almiray
   */
  public abstract class AbstractRoute implements Route {
      @Inject private ObjectMapper objectMapper;
      @Inject private MustacheTemplateEngine mustacheTemplateEngine;
  
      @Override
      public final Object handle(Request request, Response response) throws Exception {
          ModelAndView modelAndView = doHandle(request, response);
          response.status(200);
          if (shouldReturnHtml(request)) {
              response.type("text/html");
              return mustacheTemplateEngine.render(modelAndView);
          } else {
              response.type("application/json");
              return objectMapper.writeValueAsString(modelAndView.getModel());
          }
      }
  
      protected abstract ModelAndView doHandle(Request request, Response response) throws Exception;
  
      private boolean shouldReturnHtml(Request request) {
          String accept = request.headers("Accept");
          return accept != null && accept.contains("text/html");
      }
  }
  