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/ch5/postServlet/ControllerHelper.java /ch5/postServlet/ControllerHelper.java

package ch5.postServlet;

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

//import the bean from the requiredValidation application
import ch5.requiredValidation.RequestDataRequired;
import shared.HelperBaseCh5;
import shared.ButtonMethod;

public class ControllerHelper extends HelperBaseCh5 {

private RequestDataRequired data =
            new RequestDataRequired();

public ControllerHelper(HttpServletRequest request,
            HttpServletResponse response) {
        super(request, response);
    }

public Object getData() {
        return data;
    }

public void copyFromSession(Object sessionHelper) {
        if (sessionHelper.getClass() == this.getClass()) {
            data = ((ControllerHelper) sessionHelper).data;
        }
    }

protected String jspLocation(String page) {
        return "/WEB-INF/classes/ch5/postServlet/" + page;
    }

@ButtonMethod(buttonName = "editButton", isDefault = true)
    public String editMethod() {
        return jspLocation("Edit.jsp");
    }

@ButtonMethod(buttonName = "confirmButton")
    public String confirmMethod() {
        //Populate from the query string
        fillBeanFromRequest(data);
        //The next JSP address depends on the
        //validity of the data.
        String address;
        if (isValid(data)) {
            address = jspLocation("Confirm.jsp");
        } else {
            address = jspLocation("Edit.jsp");
        }
        return address;
    }

@ButtonMethod(buttonName = "processButton")
    public String processMethod() {
        return jspLocation("Process.jsp");
    }

@Override
    protected void doGet()
            throws ServletException, java.io.IOException {
        //Call the method with SessionData.IGNORE to place
        //a new helper in the session
        addHelperToSession("helper", SessionData.IGNORE);

//Edit.jsp is the only page that will be displayed
        //from a GET request.
        String address = editMethod();

request.getRequestDispatcher(address).forward(request, response);
    }

@Override
    protected void doPost()
            throws ServletException, java.io.IOException {
        //Check if there is already a helper in the session.
        addHelperToSession("helper", SessionData.READ);

String address = executeButtonMethod();

request.getRequestDispatcher(address).forward(request, response);
    }
}

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