package mvcexample.controller;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;

import mvcexample.model.*;

/**
 * A simple implementation of a servlet-based controller, using the 
 * MailingBean model from the model package.
 */
public class ListController extends HttpServlet {
    // parameters shared with the JSP.  Note these values must be the same
    // as the property names in the JSP files.
    public static final String FIRST_PARAM = "first";
    public static final String LAST_PARAM = "last";
    public static final String EMAIL_PARAM = "email";
    public static final String MAILINGBEAN_ATTR = "mailingbean";
    
    /**
     * Respond to an HTTP GET request.
     */    
    protected void doGet(HttpServletRequest request, 
                         HttpServletResponse response)
        throws ServletException, IOException
    {
        // read the paremeters from the request
        String first = request.getParameter(FIRST_PARAM);
        String last = request.getParameter(LAST_PARAM);
        String email = request.getParameter(EMAIL_PARAM);
        
        // get the mailing list bean for this list
        MailingBean mb = MailingBeanFactory.newInstance();
       
        // set the parameters into the bean
        mb.setFirst(first);
        mb.setLast(last);
        mb.setEmail(email);
       
        // store a copy of the bean in the request context
        request.setAttribute(MAILINGBEAN_ATTR, mb);
        
        // perform the business method
        boolean result = mb.doSubscribe();
      
        // choose a page based on the result
        String nextPage = "/success.jsp";
        if (!result) nextPage = "/failure.jsp";
       
        // transfer control to the selected view
        RequestDispatcher dispatcher = 
            getServletContext().getRequestDispatcher(nextPage);
        dispatcher.forward(request, response);	
    }
}