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; import java.security.Principal; import java.util.Collection; import java.util.Set; 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.beans.factory.annotation.Autowired; import org.springframework.data.rest.webmvc.ResourceNotFoundException; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import com.google.common.collect.Lists; @Controller @RequestMapping(value = VideoSvcApi.VIDEO_SVC_PATH) public class AFilledController { private static final String VIDEO_ID_PATH = "/{id}"; private static final String VIDEO_LIKE_PATH = VIDEO_ID_PATH + "/like"; private static final String VIDEO_UNLIKE_PATH = VIDEO_ID_PATH + "/unlike"; private static final String VIDEO_LIKEDBY_PATH = VIDEO_ID_PATH + "/likedby"; private static final String VIDEO_ID = "id"; // The VideoRepository that we are going to store our videos // in. We don't explicitly construct a VideoRepository, but // instead mark this object as a dependency that needs to be // injected by Spring. Our Application class has a method // annotated with @Bean that determines what object will end // up being injected into this member variable. // // Also notice that we don't even need a setter for Spring to // do the injection. // @Autowired private VideoRepository videos; @RequestMapping(method = RequestMethod.GET) public @ResponseBody Collection<Video> getVideoList() { return Lists.newArrayList(videos.findAll()); } @RequestMapping(method = RequestMethod.POST) public @ResponseBody Video addVideo(@RequestBody Video v) { return videos.save(v); } @RequestMapping(value = VIDEO_ID_PATH, method = RequestMethod.GET) public @ResponseBody Video getVideo(@PathVariable long id) { return videos.findOne(id); } @RequestMapping(value = VIDEO_LIKE_PATH, method = RequestMethod.POST) public void likeVideo(@PathVariable(VIDEO_ID) long id, HttpServletResponse response, Principal p) { setLike(id, p.getName(), response, true); } @RequestMapping(value = VIDEO_UNLIKE_PATH, method = RequestMethod.POST) public void unlikeVideo(@PathVariable(VIDEO_ID) long id, HttpServletResponse response, Principal p) { setLike(id, p.getName(), response, false); } @RequestMapping(value = VIDEO_LIKEDBY_PATH, method = RequestMethod.GET) public @ResponseBody Set<String> likedbyVideo(@PathVariable(VIDEO_ID) long id) { Video v = videos.findOne(id); if (v == null) { throw new ResourceNotFoundException(); } return v.getLikedUsers(); } // private methods private void setLike(long id, String user, HttpServletResponse res, boolean isLike) { Video v = videos.findOne(id); int code = HttpServletResponse.SC_OK; if (v == null) { code = HttpServletResponse.SC_NOT_FOUND; } else { if (isLike ? v.addLikedUser(user) : v.removeLikedUser(user)) { videos.save(v); } else { code = HttpServletResponse.SC_BAD_REQUEST; } } res.setStatus(code); } }