pulbic enum OrderStatus {
	PAID("결제완료",  true),
	COMFIRM("주문확인", true),
	DELIVERY("배송중", false),
	DONE("배송완료", false);
	
	private String desc;
	private boolean ableToCancel;
	
	public static final Set<OrderStatus> ABLE_TO_CANCEL_STATUSES;
	
	static {
		Set<OrderStatus> statuses = EnumSet.nonOf(OrderStatus.class);
		for (OrderStatus status : OrderStatus.values()) {
			if (status.ableToCancel) {
				statuses.add(status);
			}
		}
		
		ABLE_TO_CANCEL_STATUSES = Collections.UnmodifiableSet(statuses);
	}
	
	public OrderStatus(String desc, boolean ableToCancel) {
		this.desc = desc;
		this.ableToCancel = ableToCancel;
	}
}