xp-dev.com Git - RRRRHHHH_Code/blob - ruralHouses/src/businessLogic/OfferManager.java

   1 package businessLogic;
   2
   3 import java.rmi.RemoteException;
   4 import java.sql.Date;
   5
   6 import com.db4o.ObjectContainer;
   7 import com.db4o.ObjectSet;
   8
   9 import dataAccess.DB4oManager;
  10 import domain.Offer;
  11 import domain.RuralHouse;
  12 import exceptions.BadDates;
  13 import exceptions.OverlappingOfferExists;
  14
  15 public final class OfferManager {
  16
  17         private int offerNumber = 0;
  18         dataAccess.DB4oManager dbMngr;
  19         private static OfferManager theOfferManager;
  20
  21         public OfferManager() {
  22                 try {
  23                         this.dbMngr = DB4oManager.getInstance();
  24                 } catch (Exception e) {
  25                         e.printStackTrace();
  26                 }
  27         }
  28
  29         public static int getNumber() {
  30                 ObjectContainer db=DB4oManager.getContainer();
  31                 OfferManager o=getInstance();
  32                 o.offerNumber++;
  33                 db.store(o);
  34                 db.commit();
  35                 return o.offerNumber;
  36         }
  37
  38         /**
  39          * This method returns the instance of the OfferManager class
  40          *
  41          * @return the offer manager
  42          */
  43         public static OfferManager getInstance()  {
  44                 ObjectContainer db=DB4oManager.getContainer();
  45                 OfferManager b = new OfferManager();
  46                 ObjectSet<OfferManager> result = db.queryByExample(b);
  47                 if (!result.hasNext()){
  48                         theOfferManager = new OfferManager();
  49                         db.store(theOfferManager);
  50                         db.commit();
  51                 } else theOfferManager=(OfferManager)result.next();
  52                 return theOfferManager;
  53         }
  54
  55         /**
  56          * This method creates an offer with a house number, first day, last day and price
  57          *
  58          * @param House
  59          *            number, start day, last day and price
  60          * @return the created offer, or null, or an exception
  61          */
  62         public Offer createOffer(RuralHouse ruralHouse, Date firstDay, Date lastDay,
  63                         float price) throws OverlappingOfferExists, BadDates, RemoteException, Exception {
  64                 if (firstDay.after(lastDay)||firstDay==null||lastDay==null)
  65                         throw new BadDates();
  66
  67                 boolean b = dbMngr.existsOverlappingOffer(ruralHouse,firstDay,lastDay); // The ruralHouse object in the client may not be updated
  68                 if (!b) {
  69                         ruralHouse.createOffer(offerNumber, firstDay, lastDay, price);
  70                         return dbMngr.createOffer(ruralHouse,firstDay,lastDay,price);
  71                 }
  72                 return null;
  73         }
  74
  75
  76         public void deleteOffer(RuralHouse rh, Offer o) throws RemoteException, Exception{
  77                 rh.offers.removeElement(o);
  78                 dbMngr.deleteOffer( o);
  79         }
  80
  81 }