Java tutorial
/* * * Copyright 2014 Jules White * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ package org.magnum.mobilecloud.video.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import java.io.IOException; import java.security.Principal; import java.util.ArrayList; import java.util.Collection; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.concurrent.atomic.AtomicLong; import javax.servlet.http.HttpServletResponse; import org.magnum.mobilecloud.video.client.VideoSvcApi; import org.magnum.mobilecloud.video.repository.Video; import org.magnum.mobilecloud.video.repository.VideoRepository; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import com.google.common.collect.Lists; import retrofit.client.Response; @Controller public class VideoController { public static final String DATA_PARAMETER = "data"; public static final String ID_PARAMETER = "id"; public static final String VIDEO_SVC_PATH = "/video"; public static final String VIDEO_DATA_PATH = VIDEO_SVC_PATH + "/{id}/data"; public static final String TITLE_PARAMETER = "title"; public static final String DURATION_PARAMETER = "duration"; public static final String VIDEO_DURATION_SEARCH_PATH = VIDEO_SVC_PATH + "/search/findByDurationLessThan"; /** * You will need to create one or more Spring controllers to fulfill the * requirements of the assignment. If you use this file, please rename it * to something other than "AnEmptyController" * * ________ ________ ________ ________ ___ ___ ___ ________ ___ __ |\ ____\|\ __ \|\ __ \|\ ___ \ |\ \ |\ \|\ \|\ ____\|\ \|\ \ \ \ \___|\ \ \|\ \ \ \|\ \ \ \_|\ \ \ \ \ \ \ \\\ \ \ \___|\ \ \/ /|_ \ \ \ __\ \ \\\ \ \ \\\ \ \ \ \\ \ \ \ \ \ \ \\\ \ \ \ \ \ ___ \ \ \ \|\ \ \ \\\ \ \ \\\ \ \ \_\\ \ \ \ \____\ \ \\\ \ \ \____\ \ \\ \ \ \ \_______\ \_______\ \_______\ \_______\ \ \_______\ \_______\ \_______\ \__\\ \__\ \|_______|\|_______|\|_______|\|_______| \|_______|\|_______|\|_______|\|__| \|__| * */ // An in-memory list that the servlet uses to store the // videos that are sent to it by clients @Autowired private VideoRepository videos; private static final AtomicLong currentLikes = new AtomicLong(0L); // Receives POST requests to /video and converts the HTTP // request body, which should contain json, into a Video // object before adding it to the list. The @RequestBody // annotation on the Video parameter is what tells Spring // to interpret the HTTP request body as JSON and convert // it into a Video object to pass into the method. The // @ResponseBody annotation tells Spring to conver the // return value from the method back into JSON and put // it into the body of the HTTP response to the client. // // The VIDEO_SVC_PATH is set to "/video" in the VideoSvcApi // interface. We use this constant to ensure that the // client and service paths for the VideoSvc are always // in synch. // // For some ways to improve the validation of the data // in the Video object, please see this Spring guide: // http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/validation.html#validation-beanvalidation // @RequestMapping(value = VideoSvcApi.VIDEO_SVC_PATH, method = RequestMethod.POST) public @ResponseBody Video addVideo(@RequestBody Video v) { videos.save(v); System.out.print("The video we are returning is" + v.toString()); return v; } // Receives GET requests to /video and returns the current // list of videos in memory. Spring automatically converts // the list of videos to JSON because of the @ResponseBody // annotation. @RequestMapping(value = VideoSvcApi.VIDEO_SVC_PATH, method = RequestMethod.GET) public @ResponseBody Collection<Video> getVideoList() { return Lists.newArrayList(videos.findAll()); } // Receives GET requests to /video/find and returns all Videos // that have a title (e.g., Video.name) matching the "title" request // parameter value that is passed by the client @RequestMapping(value = VideoSvcApi.VIDEO_TITLE_SEARCH_PATH, method = RequestMethod.GET) public @ResponseBody Collection<Video> findByTitle( // Tell Spring to use the "title" parameter in the HTTP request's query // string as the value for the title method parameter @RequestParam(TITLE_PARAMETER) String title) { return videos.findByName(title); } @RequestMapping(value = VideoSvcApi.VIDEO_DURATION_SEARCH_PATH, method = RequestMethod.GET) public @ResponseBody Collection<Video> findByDurationLessThan( // Tell Spring to use the "title" parameter in the HTTP request's query // string as the value for the title method parameter @RequestParam(DURATION_PARAMETER) long duration) { Collection<Video> durationVideos = new ArrayList<Video>(); Iterable<Video> allVideos = videos.findAll(); for (Video video : allVideos) { if (video.getDuration() < duration) { durationVideos.add(video); } } return durationVideos; } @RequestMapping(value = VIDEO_SVC_PATH + "/{id}", method = RequestMethod.GET) public @ResponseBody Video getVideoById(@PathVariable("id") long id, HttpServletResponse response) { Video v = videos.findById(id); if (v != null) { response.setStatus(200); return v; } else { response.setStatus(404); return null; } } @RequestMapping(value = VIDEO_SVC_PATH + "/{id}" + "/like", method = RequestMethod.POST) public @ResponseBody Video likeVideo(@PathVariable("id") long id, HttpServletResponse response, Principal p) { String username = p.getName(); Video v = videos.findById(id); if (v != null) { HashSet<String> videoLikes = v.getUserLikes(); if (videoLikes.contains(username)) { response.setStatus(400); return v; } else { System.out.print("These are the videoLikes: " + videoLikes); videoLikes.add(username); System.out.print("These are the videoLikes: " + videoLikes); v.setLikes((long) (v.getLikes() + 1)); v.setUserLikes(videoLikes); response.setStatus(200); videos.save(v); return v; } } response.setStatus(404); return null; } @RequestMapping(value = VIDEO_SVC_PATH + "/{id}" + "/unlike", method = RequestMethod.POST) public @ResponseBody Video unlikeVideo(@PathVariable("id") long id, HttpServletResponse response, Principal p) { String username = p.getName(); Video v = videos.findById(id); if (v != null) { HashSet<String> videoLikes = v.getUserLikes(); if (videoLikes.contains(username)) { System.out.print("These are the videoLikes: " + videoLikes); videoLikes.remove(username); System.out.print("These are the videoLikes: " + videoLikes); v.setLikes((long) (v.getLikes() - 1)); v.setUserLikes(videoLikes); response.setStatus(200); videos.save(v); return v; } else { response.setStatus(400); return v; } } response.setStatus(404); return null; } @RequestMapping(value = VIDEO_SVC_PATH + "/{id}" + "/likedby", method = RequestMethod.GET) public @ResponseBody HashSet<String> getUsersWhoLikedVideo(@PathVariable("id") long id, HttpServletResponse response) { Video v = videos.findById(id); if (v != null) { HashSet<String> usersWhoLiked = v.getUserLikes(); response.setStatus(200); return usersWhoLiked; } else { response.setStatus(404); return null; } } }