Subversion Repositories SmartDukaan

package in.shop2020.web;

import java.io.IOException;
import java.util.Collection;

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

import in.shop2020.model.Message;
import in.shop2020.server.MessageRepository;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class IndexServlet extends HttpServlet {

        @SuppressWarnings("unused")
        private static final Logger log = LoggerFactory
                        .getLogger(IndexServlet.class);

        private MessageRepository messageRepository = new MessageRepository();
        
        @Override
        protected void doGet(HttpServletRequest request,
                        HttpServletResponse response) throws ServletException, IOException {

                if (log.isDebugEnabled()) {
                        log.debug("doGet");
                }
                
                // delete
                if (request.getParameter("id") != null) {
                        deleteMessage(request);
                        
                        response.sendRedirect("index");
                        return;
                }

                // get
                Collection<Message> messages = messageRepository.getAll();
                request.setAttribute("messages", messages);

                if (log.isDebugEnabled()) {
                        log.debug("messages: " + messages);
                }

                forward(request, response, "index.jsp");
        }

        @Override
        protected void doPost(HttpServletRequest request,
                        HttpServletResponse response) throws ServletException, IOException {
                
                if (log.isDebugEnabled()) {
                        log.debug("doPost");
                }
                
                // create
                createMessage(request);
                response.sendRedirect("index");
        }

        protected void createMessage(HttpServletRequest request) {
                String text = request.getParameter("text");
                if (log.isDebugEnabled()) {
                        log.debug("creating message with text: " + text);
                }

                Message message = new Message();
                message.setText(text);
                messageRepository.create(message);
        }

        protected void deleteMessage(HttpServletRequest request) throws IOException {
                Long id = Long.valueOf(request.getParameter("id"));
                if (log.isDebugEnabled()) {
                        log.debug("deleting message with id: " + id);
                }
                messageRepository.deleteById(id);
        }

        /**
         * Forwards request and response to given path. Handles any exceptions
         * caused by forward target by printing them to logger.
         * 
         * @param request 
         * @param response
         * @param path 
         */
        protected void forward(HttpServletRequest request,
                        HttpServletResponse response, String path) {
                try {
                        RequestDispatcher rd = request.getRequestDispatcher(path);
                        rd.forward(request, response);
                } catch (Throwable tr) {
                        if (log.isErrorEnabled()) {
                                log.error("Cought Exception: " + tr.getMessage());
                                log.debug("StackTrace:", tr);
                        }
                }
        }
}