package auction.model;import java.util.Date;/** * Escrow base class for CaveatEmptor. * * A particular shipment under supervision, from a seller to a buyer. * <p> * The process (see <tt>ShipmentState</tt>) is supposed to be: * <li>AGREED: Both parties agree on the deal and a Shipment is created * <li>PAYED: The buyer payed the shipment * <li>IN_TRANSIT: The seller sent the shipment * <li>ACCEPTED: The buyer accepted the shipment in the inspection period * <li>COMPLETE: The payment has been transfered to the seller * <p> * The escrow service may be in the context of an auction, or utilized * by all users for deals made outside of CaveatEmptor. Hence, the * auction <tt>Item</tt> reference is optional and may be null. * * @author Christian Bauer */public class Shipment {    private Long id = null;    private int version = 0;    private AddressEntity deliveryAddress;    private Item auction; // Nullable    private User buyer;    private User seller;    private int inspectionPeriodDays;    private ShipmentState state = ShipmentState.AGREED;    private Date created = new Date();    /**     * No-arg constructor for JavaBean tools     */    public Shipment() {}    /**     * Regular constructor     */    public Shipment(AddressEntity deliveryAddress, User buyer, User seller, int inspectionPeriodDays) {        this.deliveryAddress = deliveryAddress;        this.buyer = buyer;        this.seller = seller;        this.inspectionPeriodDays = inspectionPeriodDays;    }    // ********************** Accessor Methods ********************** //    public Long getId() { return id; }    public int getVersion() { return version; }    public AddressEntity getDeliveryAddress() { return deliveryAddress; }    public Item getAuction() { return auction; }    public void setAuction(Item auction) { this.auction = auction; }    public User getSeller() { return seller; }    public User getBuyer() { return buyer; }    public int getInspectionPeriodDays() { return inspectionPeriodDays; }    public ShipmentState getState() { return state; }    public void setState(ShipmentState state) { this.state = state; }    public Date getCreated() { return created; }    // ********************** Common Methods ********************** //    public boolean equals(Object o) {        if (this == o) return true;        if (!(o instanceof Shipment)) return false;        final Shipment shipment = (Shipment) o;        if (inspectionPeriodDays != shipment.inspectionPeriodDays) return false;        if (!buyer.getId().equals(shipment.buyer.getId())) return false;        if (!created.equals(shipment.created)) return false;        return seller.getId().equals(shipment.seller.getId());    }    public int hashCode() {        int result;        result = seller.getId().hashCode();        result = 29 * result + buyer.getId().hashCode();        result = 29 * result + inspectionPeriodDays;        result = 29 * result + created.hashCode();        return result;    }    public String toString() {        return  "Shipment ('" + getId() + "'), " +                "State: '" + getState() + "'";    }    // ********************** Business Methods ********************** //}