/** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
int change, empty;
String tablename = "ParkingInfo";
HttpSession session = request.getSession();
String LotId = (String) session.getAttribute("lotid");
session.setAttribute("wronginfo", null);
DynamoDB dynamoDB = new DynamoDB(new AmazonDynamoDBClient());
Table table = dynamoDB.getTable(tablename);
Item item = table.getItem("Parkurself", "parkurself", "Id", LotId);
int newe = item.getInt("AvailableSpots");
change = Integer.parseInt(request.getParameter("carsin"));
empty = newe - change;
item.withInt("AvailableSpots", empty);
table.deleteItem("Parkurself", "parkurself", "Id", LotId);
table.putItem(item);
newe = item.getInt("AvailableSpots");
change = Integer.parseInt(request.getParameter("carsout"));
empty = newe + change;
item.withInt("AvailableSpots", empty);
table.deleteItem("Parkurself", "parkurself", "Id", LotId);
table.putItem(item);
newe = item.getInt("AvailableSpots");
if (item.getInt("AvailableSpots") > item.getInt("Total")) {
item.withInt("AvailableSpots", item.getInt("Total"));
table.deleteItem("Parkurself", "parkurself", "Id", LotId);
table.putItem(item);
session.setAttribute("wronginfo", "minus");
} else if (item.getInt("AvailableSpots") < 0) {
int wrongnum = 0 - item.getInt("AvailableSpots");
item.withInt("AvailableSpots", 0);
table.deleteItem("Parkurself", "parkurself", "Id", LotId);
table.putItem(item);
session.setAttribute("wronginfo", "exceed");
session.setAttribute("wrongnum", wrongnum);
}
session.setAttribute("olde", item.get("AvailableSpots"));
session.setAttribute("newe", item.get("AvailableSpots"));
response.sendRedirect("home.jsp");
}
