package auction.command;import auction.model.*;import auction.dao.*;import auction.exceptions.*;import java.math.BigDecimal;import java.util.Currency;/** * An example of the EJB command pattern. * <p> * Some parameters are passed in, the control logic is executed, the * result comes back. * * @author Christian Bauer */public class BidForItemCommand extends DataAccessCommand {    private Long userId;	private Long itemId;	private BigDecimal bidAmount;	private Bid newBid;	public BidForItemCommand(Long userId,							 Long itemId,							 BigDecimal bidAmount) {		this.userId = userId;		this.itemId = itemId;		this.bidAmount = bidAmount;	}	public Bid getNewBid() {		return newBid;	}	public void execute() throws CommandException {        ItemDAO itemDAO = daoFactory.getItemDAO();        UserDAO userDAO = daoFactory.getUserDAO();        try {			MonetaryAmount newAmount =			        new MonetaryAmount(bidAmount, Currency.getInstance("USD"));			Bid currentMaxBid = itemDAO.getMaxBid(itemId);			Bid currentMinBid = itemDAO.getMinBid(itemId);			Item item = itemDAO.findById(itemId, true);			newBid = item.placeBid(userDAO.findById(userId, false),									newAmount,									currentMaxBid,			                        currentMinBid);		} catch (BusinessException ex) {			// Rethrow as a checked exception that can trigger rollback			throw new CommandException(ex);        }	}}