rentingsessionbeanbean.java

Java Application using EJB 3.0 for renting a car - Entities : Car, User, Renting Business Logic. Ne

package BusinessSessionBeans;


import Entities.RentingEntityBean;
import Entities.CarEntityBean;
import exception.CarNotFreeException;
import exception.CarNotFoundException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

/**
 *
 * @author kiriashoo
 */

@Stateless
public class RentingSessionBeanBean implements BusinessSessionBeans.RentingSessionBeanRemote  {

   @PersistenceContext
   private EntityManager em;

   public RentingSessionBeanBean() { }

   public void create(Integer carId, Integer userId, String sDate, String eDate) throws CarNotFreeException, CarNotFoundException  {
      CarSessionBeanRemote carSBean;
      try {
          javax.naming.Context c = new javax.naming.InitialContext();
          carSBean=(CarSessionBeanRemote)c.lookup(CarSessionBeanRemote.class.getName());
      }
      catch(javax.naming.NamingException ne) {
          java.util.logging.Logger.getLogger(getClass().getName()).log(java.util.logging.Level.SEVERE,"exception caught" ,ne);
          throw new RuntimeException(ne);
      }
      CarEntityBean car= carSBean.find(carId);//se cauta masina dupa id
      if (car== null){
         throw new CarNotFoundException();
      }
      //cauta in bd o inchiriere pentru id-ul masinii dat ca parametru, o inchiriere in perioada specificata
      //daca gaseste inseamna ca masina nu este libera

      List rentings= em.createQuery("select object(o) from RentingEntityBean o where o.carId = "+ carId+" and ((o.sDate<='"+sDate+"' and o.eDate>'"+sDate+"' ) or (o.sDate<'"+eDate+"' and o.eDate>='"+eDate+"' ))  ").getResultList();
      //daca lista nu e goala arunca exceptie
      if (!rentings.isEmpty())
         throw new CarNotFreeException(carId, sDate, eDate);
      //daca lista e goala creaza o inchiriere noua
      RentingEntityBean rentBean= new RentingEntityBean();
      rentBean.setCarId(carId);
      rentBean.setUserId(userId);
      rentBean.setSDate(sDate);
      rentBean.setEDate(eDate);
      em.persist(rentBean);
   }

   public void edit(RentingEntityBean rentBean) {
      em.merge(rentBean);
   }

   public void destroy(RentingEntityBean rentBean) {
      em.remove(rentBean);
   }

   public RentingEntityBean find(Object pk) {
      return (RentingEntityBean) em.find(RentingEntityBean.class, pk);
   }

   public List findAvailabeCars(String sDate, String eDate) {
      List result= new ArrayList();
      List bookings;
      CarSessionBeanRemote carSBean;
      CarEntityBean carBean;
      RentingEntityBean  rentBean;
      String[] rand= new String [6];
      try {
          javax.naming.Context c = new javax.naming.InitialContext();
          carSBean=(CarSessionBeanRemote)c.lookup(CarSessionBeanRemote.class.getName());
      }
      catch(javax.naming.NamingException ne) {
          java.util.logging.Logger.getLogger(getClass().getName()).log(java.util.logging.Level.SEVERE,"exception caught" ,ne);
          throw new RuntimeException(ne);
      }
      List car= carSBean.findAll();//se citesc toate masinile din bd
      Iterator it= car.iterator();//pt fiecare masina
      while (it.hasNext()){
         carBean= (CarEntityBean)it.next();
         rand[0]= carBean.getId().toString();
         rand[1]= carBean.getMake();
         rand[2]= carBean.getModel();
         rand[3]= String.valueOf(carBean.getYearOfFabr());
         //se interogheaza dupa id-ul masinii. se afla daca masina cu id-ul dat este disponibila
         bookings= em.createQuery("select object(o) from RentingEntityBean o where o.carId = "+ rand[0]+" and ((o.sDate<='"+sDate+"' and o.eDate>'"+sDate+"' ) or (o.sDate<'"+eDate+"' and o.eDate>='"+eDate+"' ))").getResultList();
         if(bookings.isEmpty()){
            // the apartment has not been booked
            result.add(new String[]{rand[0], rand[1], rand[2], rand[3],rand[4]});
         }
      }
      return result;
   }
}