/*
* Copyright 2013 Google Inc.
*
* 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 com.google.appengine.samples.angularjs_guestbook.rest;
import com.google.appengine.api.datastore.*;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
import com.google.appengine.samples.angularjs_guestbook.domain.Greeting;
import com.google.appengine.samples.angularjs_guestbook.domain.GuestbookResponse;
import com.google.appengine.samples.angularjs_guestbook.domain.UserServiceInfo;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import java.util.*;
import java.util.logging.Logger;
/**
* Created with IntelliJ IDEA.
* User: Takashi Matsuo [tmatsuo@google.com]
* Date: 4/4/13
* Time: 11:58 PM
*/
@Path("/guestbook")
public class GuestbookResource {
private final Logger logger = Logger.getLogger(GuestbookResource.class.getName());
private List<Greeting> getGreetings(String guestbookName) {
List<Greeting> greetings = new ArrayList<Greeting>();
DatastoreService datastoreService = DatastoreServiceFactory.getDatastoreService();
Key guestbookKey = KeyFactory.createKey("Guestbook", guestbookName);
Query query =
new Query("Greeting", guestbookKey).addSort("date", Query.SortDirection.DESCENDING);
List<Entity> greetingEntities = datastoreService.prepare(query).asList(FetchOptions.Builder
.withLimit(10));
for (Entity greeting : greetingEntities) {
greetings.add(Greeting.fromEntity(greeting));
}
return greetings;
}
@GET
@Path("/{guestbookName}")
@Produces(MediaType.APPLICATION_JSON)
public GuestbookResponse getGuestbookData(
@DefaultValue("default") @PathParam("guestbookName") final String guestbookName) throws
Exception {
return new GuestbookResponse(guestbookName, getGreetings(guestbookName),
UserServiceInfo.get("/"));
}
@POST
@Path("/{guestbookName}")
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public GuestbookResponse signGuestbook(
@DefaultValue("default") @PathParam("guestbookName") final String guestbookName,
final Map<String, String> postData) {
UserService userService = UserServiceFactory.getUserService();
DatastoreService datastoreService = DatastoreServiceFactory.getDatastoreService();
Key guestbookKey = KeyFactory.createKey("Guestbook", guestbookName);
// We set the above parent key on each Greeting entity in order to make the queries strong
// consistent. Please Note that as a trade off, we can not write to a single guestbook at a
// rate more than 1 write/second.
String content = postData.get("content");
if (content != null && content.length() > 0) {
Date date = new Date();
Entity greeting = new Entity("Greeting", guestbookKey);
greeting.setProperty("user", userService.getCurrentUser());
greeting.setProperty("date", date);
greeting.setProperty("content", content);
datastoreService.put(greeting);
}
return new GuestbookResponse(guestbookName, getGreetings(guestbookName), null);
}
}