userformcontroller.java

springlive ch4

package org.appfuse.web;

import java.text.NumberFormat;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.appfuse.model.User;
import org.appfuse.service.UserManager;

import org.springframework.beans.propertyeditors.CustomNumberEditor;
import org.springframework.validation.BindException;
import org.springframework.web.bind.ServletRequestDataBinder;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
import org.springframework.web.servlet.view.RedirectView;


public class UserFormController extends SimpleFormController {
    private static Log log = LogFactory.getLog(UserFormController.class);
    private UserManager mgr = null;

    public void setUserManager(UserManager userManager) {
        this.mgr = userManager;
    }

    public UserManager getUserManager() {
        return this.mgr;
    }

    /**
     * Set up a custom property editor for converting Longs
     */
    protected void initBinder(HttpServletRequest request,
                              ServletRequestDataBinder binder) {
        NumberFormat nf = NumberFormat.getNumberInstance();
        binder.registerCustomEditor(Long.class, null,
                                    new CustomNumberEditor(Long.class, nf, true));
    }

    public ModelAndView onSubmit(HttpServletRequest request,
                                 HttpServletResponse response, Object command,
                                 BindException errors)
    throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("entering 'onSubmit' method...");
        }

        User user = (User) command;

        if (request.getParameter("delete") != null) {
            mgr.removeUser(user.getId().toString());
            request.getSession().setAttribute("message", 
                    getMessageSourceAccessor().getMessage("user.deleted", 
                    new Object[] {user.getFirstName() + ' ' + user.getLastName()}));
                                              
        } else {
            mgr.saveUser(user);
            request.getSession().setAttribute("message", 
                    getMessageSourceAccessor().getMessage("user.saved", 
                    new Object[] {user.getFirstName() + ' ' + user.getLastName()}));
        }

        return new ModelAndView(new RedirectView(getSuccessView()));
    }

    protected Object formBackingObject(HttpServletRequest request)
    throws ServletException {
        String userId = request.getParameter("id");

        if ((userId != null) && !userId.equals("")) {
            return mgr.getUser(request.getParameter("id"));
        } else {
            return new User();
        }
    }
}