DAO:
/**
	 * Returns the appointment blocks corresponding to the given date and location.
	 *
	 * @param date the date to filter by.
	 * @param location the location to filter by.
	 * @return the appointment blocks that is on the given date and location.
	 */
	@Override
	@Transactional(readOnly = true)
	public List<AppointmentBlock> getAppointmentBlocks(Date fromDate, Date toDate, Location location) {
		Criteria criteria = sessionFactory.getCurrentSession().createCriteria(AppointmentBlock.class);
		if (location != null)
			criteria.add(Restrictions.eq("location", location));
		if (fromDate != null)
			criteria.add(Restrictions.ge("startDate", fromDate));
		if (toDate != null)
			criteria.add(Restrictions.le("endDate", toDate));
		return criteria.list();
	}