Distributed Sysems - JEE: getAvailableCarTypes

gistfile1.java

// Distributed Systems - JEE/CarRental-ejb/src/java/session/CarRentalSession.java:
    @Override
    public List<CarType> getAvailableCarTypes(Date start, Date end) {
        final Query query = em.createNamedQuery("CarRentalCompany.findAll", CarRentalCompany.class);
        final List<CarType> availableCarTypes = new LinkedList<CarType>();
        final List<CarRentalCompany> companies = query.getResultList();
        
        for (final CarRentalCompany rentalCompany : companies)
            for(final CarType type : rentalCompany.getAvailableCarTypes(start, end))
                if(!availableCarTypes.contains(type))
                    availableCarTypes.add(type);

        return availableCarTypes;
    }

// Distributed Systems - JEE/CarRental-ejb/src/java/rental/CarRentalCompany.java:
    private List<Car> getAvailableCars(String carType, Date start, Date end) {
        final List<Car> availableCars = new LinkedList<Car>();
        
        for (Car car : cars)
            if (car.getType().getName().equals(carType) && car.isAvailable(start, end))
                availableCars.add(car);
        
        return availableCars;
    }

// Distributed Systems - JEE/CarRental-ejb/src/java/rental/Car.java"
    public boolean isAvailable(Date start, Date end) {
        if(!start.before(end))
            throw new IllegalArgumentException("Illegal given period");

        for(Reservation reservation : reservations) {
            if(reservation.getEndDate().before(start) || reservation.getStartDate().after(end))
                continue;
            return false;
        }
        return true;
    }