DWR SERVICE:
public List<AppointmentBlockDetails> getAppointmentBlocks(Date fromDate, Date toDate, Integer locationId) {
		List<AppointmentBlock> appointmentBlockList = new ArrayList<AppointmentBlock>();
		List<AppointmentBlockDetails> appointmentBlockDetails = new Vector<AppointmentBlockDetails>();
		if (Context.isAuthenticated()) {
			AppointmentService appointmentService = Context.getService(AppointmentService.class);
			Location location = null;
			if (locationId != null)
				location = Context.getLocationService().getLocation(locationId);
			appointmentBlockList = appointmentService.getAppointmentBlocks(fromDate, toDate, location);
			for (AppointmentBlock appointmentBlock : appointmentBlockList) {
				Set<AppointmentType> appointmentTypes = appointmentBlock.getTypes();
				String appointmentTypeNames = "";
				int appointmentTypeSize = appointmentTypes.size();
				for (AppointmentType appointmentType : appointmentTypes) {
					appointmentTypeNames += appointmentType.getName();
					//if it is not the last type, append ","
					if (appointmentTypeSize > 1)
						appointmentTypeNames += ", ";
					appointmentTypeSize--;
				}
				appointmentBlockDetails.add(new AppointmentBlockDetails(appointmentBlock.getId() + "", appointmentBlock
				        .getLocation().getName(), appointmentBlock.getProvider().getName(), appointmentTypeNames,
				        appointmentBlock.getStartDate().toString(), appointmentBlock.getEndDate().toString()));
			}
		}
		return appointmentBlockDetails;
	}