@RequestMapping(value = "/{id}/delete", method = RequestMethod.GET)
public String delete(
@PathVariable("id") Long id, Model uiModel, RedirectAttributes redirectAttributes) {
_logger.info("Process delete");
bugDao.delete(bugDao.findBugById(id));
return "redirect:/bug/";
}
/**
* Handler method to process URLs ending with /bugs/<id>, that are invoked by HTTP GET methods,
* and which have a query parameter named "form". The purpose of this method is to retrieve a form
* that users can use to edit the specified bug.
*
* @param id the id of the bug to edit.
* @param uiModel the model supplied by the MVC framework. This method will populate the model
* with the required bug so that is can be included in the view.
* @return logical view name.
*/
@RequestMapping(value = "/{id}", params = "form", method = RequestMethod.GET)
public String updateForm(@PathVariable("id") Long id, Model uiModel) {
// Lookup the bug and add it to the model.
uiModel.addAttribute("bug", bugDao.findBugById(id));
return "bug/update";
}
/**
* Handler method to process URLs that end with "/bugs" and that are invoked by HTTP GET methods.
*
* @param uiModel the model supplied the MVC framework. This will be populated with a list of bug
* objects.
* @return logical name of the view to render the model.
*/
@RequestMapping(method = RequestMethod.GET)
public String list(Model uiModel) {
_logger.info("Process form GET list");
List<BugTracking> bugs = bugDao.findAllWithDetail();
uiModel.addAttribute("bugs", bugs);
_logger.info("Process form GET list successful");
return "bugs/list";
}
/**
* Handler method to process URLs ending with /bugs/<id> and that are invoked by HTTP GET methods.
* This method finds a Bug with the specified id and adds it to the model.
*
* @param id the unique id of the Bug required.
* @param uiModel the model that is supplied by the MVC framework and which will be used to store
* the bug.
* @return logical name of the view to render the model.
*/
@RequestMapping(value = "/{id}", method = RequestMethod.GET)
public String show(@PathVariable("id") Long id, Model uiModel) {
_logger.info("Process form GET show");
// Lookup the bug.
BugTracking bug = bugDao.findBugById(id);
// Add the bug to the model.
uiModel.addAttribute("bug", bug);
_logger.info("Process form GET show successful");
// Return the logical view name that will render the model.
return "bug/show";
}
/**
* Similar to handler method update(), but enables new bugs to be created as opposed to existing
* bugs being edited.
*/
@RequestMapping(params = "form", method = RequestMethod.POST)
public String create(
@Valid BugTracking bug,
BindingResult bindingResult,
Model uiModel,
RedirectAttributes redirectAttributes) {
_logger.info("Creating Bug");
if (bindingResult.hasErrors()) {
uiModel.addAttribute("bug", bug);
Message message = Message.createFailureSaveMessage();
uiModel.addAttribute("message", message);
return "bug/create";
}
Message message = Message.createSuccessfulSaveMessage();
redirectAttributes.addFlashAttribute("message", message);
bugDao.save(bug);
return "redirect:/bug/" + bug.getId();
}
/**
* Handler method to process URLs ending with /bugs/<id>, that are invoked by HTTP POST methods,
* and which are a query parameter named "form". The purpose of this method is to update an
* existing and specified bug based on form data that is submitted with the POST request.
*
* @param bug the bug object, created by the MCV framework, that is represented by the POSTed
* content.
* @param bindingResult stores any errors associated with failed validation constraints. The MVC
* framework automatically applies validation constraints to the freshly created bug object
* and populated the BindingResult if errors are detected.
* @param uiModel the model that is supplied by the MVC framework. This method adds status
* messages to the model that will be rendered in a view. In cases where validation
* constraints have failed, this method also adds the bug object to the model so that its
* properties (name, DoB etc.) can be displayed and edited.
* @param redirectAttributes holds a status message temporarily during a HTTP redirect response.
* When the browser requests the redirected page, the status message is available to be
* rendered as part of the page.
* @return logical name of the view to render the model.
*/
@RequestMapping(value = "/{id}", params = "form", method = RequestMethod.POST)
public String update(
@Valid BugTracking bug,
BindingResult bindingResult,
Model uiModel,
RedirectAttributes redirectAttributes) {
_logger.info("Process form POST");
if (bindingResult.hasErrors()) {
// Validation constraint(s) have failed.
// Add the bug that has been POSTed (and edited incorrectly by the user) to the
// model.
uiModel.addAttribute("bug", bug);
// Add a Message to the model explaining that the bug could not be saved due to
// failed validation constraints.
Message message = Message.createFailureSaveMessage();
uiModel.addAttribute("message", message);
// Return the logical name of a view that will redisplay the form, populated with the
// bug object and message.
return "bug/update";
}
_logger.info("Updating Bug: " + bug);
// Validation constraints have passed, so create a "successful save" message and save the
// bug.
Message message = Message.createSuccessfulSaveMessage();
bugDao.save(bug);
// Use a RedirectAttribute to temporarily hold the message during the redirect.
redirectAttributes.addFlashAttribute("message", message);
// Redirect the browser to a page that displays the updated bug.
return "redirect:/bug/" + bug.getId();
}