com.google.livingstories.servlet.StartPageServlet.java Source code

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Here is the source code for com.google.livingstories.servlet.StartPageServlet.java

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/**
 * Copyright 2010 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.livingstories.servlet;

import com.google.gxp.base.GxpContext;
import com.google.livingstories.gxps.StartPageHtml;
import com.google.livingstories.server.dataservices.UserDataService;
import com.google.livingstories.server.dataservices.UserLoginService;
import com.google.livingstories.server.dataservices.impl.DataImplFactory;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet for the living stories start page.
 */
public class StartPageServlet extends HttpServlet {
    protected UserLoginService userLoginService;
    protected UserDataService userDataService;

    public StartPageServlet() {
        this.userLoginService = DataImplFactory.getUserLoginService();
        this.userDataService = DataImplFactory.getUserDataService();
    }

    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        String loggedInUser = userLoginService.getUserId();

        JSONObject lastVisitTimes = new JSONObject();
        if (loggedInUser != null) {
            // Note: the date format that will be transferred via JSON should match with the date format
            // being used in {@link StartPage} which parses it. In particular, the timezone must be
            // included in the date being transferred.
            DateFormat dateFormatter = new SimpleDateFormat("MMMMM d, yyyy HH:mm:ss aaa ZZZZ");
            Map<Long, Date> allStoryMap = userDataService.getAllLastVisitTimes(loggedInUser);
            for (Map.Entry<Long, Date> entry : allStoryMap.entrySet()) {
                if (entry.getValue() != null) {
                    try {
                        lastVisitTimes.put(entry.getKey().toString(), dateFormatter.format(entry.getValue()));
                    } catch (JSONException e) {
                        // Do nothing
                    }
                }
            }
        }

        ExternalServiceKeyChain externalProperties = new ExternalServiceKeyChain(getServletContext());
        String currentUrl = req.getRequestURI();
        StartPageHtml.write(resp.getWriter(), new GxpContext(req.getLocale()), req.getRequestURI(),
                userLoginService.getUserDisplayName(), userLoginService.createLoginUrl(currentUrl),
                userLoginService.createLogoutUrl(currentUrl), lastVisitTimes,
                loggedInUser == null ? null : userDataService.getDefaultStoryView(loggedInUser),
                externalProperties.getLogoFileLocation(), externalProperties.getAnalyticsAccountId());
    }
}