# AjaxServlet.java

    /*
     * Copyright (C) 2000 - 2024 Silverpeas
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the
     * License, or (at your option) any later version.
     *
     * As a special exception to the terms and conditions of version 3.0 of
     * the GPL, you may redistribute this Program in connection with Free/Libre
     * Open Source Software ("FLOSS") applications as described in Silverpeas's
     * FLOSS exception. You should have received a copy of the text describing
     * the FLOSS exception, and it is also available here:
     * "http://www.silverpeas.org/docs/core/legal/floss_exception.html"
     *
     * 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 Affero General Public License for more details.
     *
     * You should have received a copy of the GNU Affero General Public License
     * along with this program. If not, see <https://www.gnu.org/licenses/>.
     */

    package org.silverpeas.components.gallery.servlets;

    import jakarta.servlet.http.HttpServlet;
    import jakarta.servlet.http.HttpServletRequest;
    import jakarta.servlet.http.HttpServletResponse;
    import jakarta.servlet.http.HttpSession;
    import org.silverpeas.components.gallery.control.GallerySessionController;
    import org.silverpeas.core.node.model.NodePK;
    import org.silverpeas.kernel.logging.SilverLogger;

    import java.io.IOException;
    import java.io.Writer;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.StringTokenizer;

    public class AjaxServlet extends HttpServlet {

      private static final long serialVersionUID = 1L;

      @Override
      protected void doGet(HttpServletRequest req, HttpServletResponse resp)
          throws IOException {
        doPost(req, resp);
      }

      @Override
      protected void doPost(HttpServletRequest req, HttpServletResponse resp)
          throws IOException {

        String action = getAction(req);
        String result;
        if ("Sort".equals(action)) {
          result = sort(req);
          Writer writer = resp.getWriter();
          writer.write(result);
        }
      }

      private String getAction(HttpServletRequest req) {
        return req.getParameter("Action");
      }

      private String sort(HttpServletRequest req) {
        HttpSession session = req.getSession();
        String orderedList = req.getParameter("orderedList");
        String componentId = (String) session.getAttribute("Silverpeas_Album_ComponentId");

        StringTokenizer tokenizer = new StringTokenizer(orderedList, ",");
        List<NodePK> albumPKs = new ArrayList<>();
        while (tokenizer.hasMoreTokens()) {
          albumPKs.add(new NodePK(tokenizer.nextToken(), componentId));
        }

        // Save album order
        try {
          GallerySessionController.sortAlbums(albumPKs);
          return "ok";
        } catch (Exception e) {
          SilverLogger.getLogger(this).error(e);
        }

        return "error";

      }

    }