org.infoscoop.web.MenuLatestCheckServlet.java Source code

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Here is the source code for org.infoscoop.web.MenuLatestCheckServlet.java

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/* infoScoop OpenSource
 * Copyright (C) 2010 Beacon IT Inc.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.
 * 
 * This program 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0-standalone.html>.
 */

package org.infoscoop.web;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.infoscoop.dao.MenuCacheDAO;
import org.infoscoop.dao.model.MENUCACHEPK;
import org.infoscoop.dao.model.MenuCache;
import org.infoscoop.util.Crypt;
import org.json.JSONArray;

public class MenuLatestCheckServlet extends HttpServlet {
    /**
     * 
     */
    private static final long serialVersionUID = 3442930551294149947L;
    private static Log log = LogFactory.getLog(MenuLatestCheckServlet.class);

    protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        StringBuffer buf = new StringBuffer();
        BufferedReader reader = req.getReader();
        String s = null;
        while ((s = reader.readLine()) != null) {
            buf.append(s);
        }

        String uid = (String) req.getSession().getAttribute("Uid");
        if (uid == null)
            return;//The alert is unnecessary in the case of non-login.

        String url = (String) req.getParameter("url");
        try {
            res.setHeader("Content-Type", "text/xml; charset=UTF-8");
            Writer w = res.getWriter();
            MenuCacheDAO dao = MenuCacheDAO.newInstance();
            MenuCache cache = dao.get(uid, url);
            if (cache != null && cache.getMenuIds() != null) {
                Set oldIds = new HashSet(Arrays.asList(new String(cache.getMenuIds()).split(",")));
                Set newIds = new HashSet(Arrays.asList(buf.toString().split(",")));
                newIds.removeAll(oldIds);
                JSONArray array = new JSONArray();
                for (Iterator it = newIds.iterator(); it.hasNext();) {
                    String id = (String) it.next();
                    array.put(id);
                }
                w.write(array.toString());
            } else {
                cache = new MenuCache(new MENUCACHEPK(Crypt.getHash(url), uid));
                w.write("[]");
            }
            cache.setMenuIds(buf.toString().getBytes());
            dao.insertOrUpdate(cache);

            w.flush();
            w.close();
        } catch (Exception e) {
            log.error("unexcepted error", e);
            res.sendError(500, e.getMessage());
        }
    }

}