/**
* This action deletes a single alert from the system.
*
* @param userSession the user session that is performing the action.
* @param request the http request object related to the action.
* @param response the http response object related to the action.
* @throws javax.servlet.ServletException
* @throws java.io.IOException
*/
public void performDelete(
UserSession userSession, HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String alert_no = request.getParameter("alert_no");
LogController.write(this, "[USER REQUEST] Performing alert delete: " + alert_no);
AlertBean alert = new AlertBean();
try {
alert.setAlertNo(Integer.parseInt(alert_no));
} catch (Exception e) {
LogController.write(this, "Received invalid value for alert number: " + alert_no);
return;
}
SessionController.deleteAlert(userSession, alert);
forward("welcome-employee.jsp", request, response);
}
/**
* Processes the request coming to the servlet and grabs the attributes set by the servlet and
* uses them to fire off pre-determined methods set in the setupActionMethods function of the
* servlet.
*
* @param request the http request coming from the browser.
* @param response the http response going to the browser.
* @throws javax.servlet.ServletException
* @throws java.io.IOException
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if (!actionInitialized) {
LogController.write(this, "This dispatcher servlet is not initialized properly!");
return;
}
if (actionTag == null) {
LogController.write(this, "There is no action attribute tag name!");
return;
}
HttpSession httpSession = request.getSession();
UserSession userSession = (UserSession) httpSession.getAttribute("user_session");
if (userSession == null) {
LogController.write(this, "User session is no longer available in this http session.");
userSession = new UserSession();
// We always want a user session though...
httpSession.setAttribute("user_session", userSession);
}
String action = (String) request.getAttribute(actionTag);
try {
if (action == null) {
// There is no action attribute specified, check parameters.
String external_action = (String) request.getParameter(actionTag);
if (external_action != null) {
Method method = externalActions.get(external_action);
if (method != null) {
LogController.write(this, "Performing external action: " + external_action);
method.invoke(this, new Object[] {userSession, request, response});
} else {
if (defaultExternalMethod != null) {
LogController.write(this, "Performing default external action.");
defaultExternalMethod.invoke(this, new Object[] {userSession, request, response});
} else {
LogController.write(this, "Unable to perform default external action.");
}
}
} else {
if (defaultExternalMethod != null) {
LogController.write(this, "Performing default external action.");
defaultExternalMethod.invoke(this, new Object[] {userSession, request, response});
} else {
LogController.write(this, "Unable to perform default external action.");
}
}
} else {
Method method = internalActions.get(action);
if (method != null) {
LogController.write(this, "Performing internal action: " + action);
method.invoke(this, new Object[] {userSession, request, response});
} else {
if (defaultInternalMethod != null) {
LogController.write(this, "Performing default internal action.");
defaultInternalMethod.invoke(this, new Object[] {userSession, request, response});
} else {
LogController.write(this, "Unable to perform default internal action.");
}
}
request.removeAttribute("application_action");
}
} catch (IllegalAccessException accessEx) {
LogController.write(this, "Exception while processing request: " + accessEx.getMessage());
} catch (InvocationTargetException invokeEx) {
LogController.write(this, "Exception while processing request: " + invokeEx.toString());
invokeEx.printStackTrace();
} catch (Exception ex) {
LogController.write(this, "Unknown exception: " + ex.toString());
}
}