package auction.model;import auction.exceptions.BusinessException;import java.io.Serializable;import java.util.*;/** * A user of the CaveatEmptor auction application. * * @author Christian Bauer */public class User implements Serializable, Comparable {    private Long id = null;    private int version = 0;    private String firstname;    private String lastname;    private String username; // Unique and immutable    private String password;    private String email;    private int ranking = 0;    private boolean admin = false;    private Address homeAddress;    private Address billingAddress;    private AddressEntity shippingAddress;    private Set<BillingDetails> billingDetails = new HashSet<BillingDetails>();    private BillingDetails defaultBillingDetails;    private Collection<Item> itemsForSale = new ArrayList<Item>();    private Set<Item> boughtItems = new HashSet<Item>();    private Date created = new Date();    /**     * No-arg constructor for JavaBean tools     */    public User() {}    /**     * Full constructor     */    public User(String firstname, String lastname, String username, String password, String email, int ranking,                boolean admin, Address homeAddress, Address billingAddress, AddressEntity shippingAddress,                Set<BillingDetails> billingDetails, BillingDetails defaultBillingDetails,                Set<Item> itemsForSale, Set<Item> boughtItems) {        this.firstname = firstname;        this.lastname = lastname;        this.username = username;        this.password = password;        this.email = email;        this.ranking = ranking;        this.admin = admin;        this.homeAddress = homeAddress;        this.billingAddress = billingAddress;        this.shippingAddress = shippingAddress;        this.billingDetails = billingDetails;        this.defaultBillingDetails = defaultBillingDetails;        this.itemsForSale = itemsForSale;        this.boughtItems = boughtItems;    }    /**     * Simple constructor.     */    public User(String firstname, String lastname,                String username, String password, String email) {        this.firstname = firstname;        this.lastname = lastname;        this.username = username;        this.password = password;        this.email = email;    }    // ********************** Accessor Methods ********************** //    public Long getId() { return id; }    public int getVersion() { return version; }    public String getFirstname() { return firstname; }    public void setFirstname(String firstname) { this.firstname = firstname; }    public String getLastname() { return lastname; }    public void setLastname(String lastname) { this.lastname = lastname; }    public String getUsername() { return username; }    public String getPassword() { return password; }    public void setPassword(String password) { this.password = password; }    public String getEmail() { return email; }    public void setEmail(String email) { this.email = email; }    public int getRanking() { return ranking; }    public void setRanking(int ranking) { this.ranking = ranking; }    public boolean isAdmin() { return admin; }    public void setAdmin(boolean admin) { this.admin = admin; }    public Address getHomeAddress() { return homeAddress; }    public void setHomeAddress(Address homeAddress) { this.homeAddress = homeAddress; }    public Address getBillingAddress() { return billingAddress; }    public void setBillingAddress(Address billingAddress) { this.billingAddress = billingAddress; }    public AddressEntity getShippingAddress() { return shippingAddress; }    public void setShippingAddress(AddressEntity shippingAddress) { this.shippingAddress = shippingAddress; }    public Set getBillingDetails() { return billingDetails; }    /**      * Adds a <tt>BillingDetails</tt> to the set.      * <p>      * This method checks if there is only one billing method      * in the set, then makes this the default.      *      * @param billingDetails      */     public void addBillingDetails(BillingDetails billingDetails) {         if (billingDetails == null)             throw new IllegalArgumentException("Can't add a null BillingDetails.");         this.getBillingDetails().add(billingDetails);         if (getBillingDetails().size() == 1) {             setDefaultBillingDetails(billingDetails);         }    }    /**     * Removes a <tt>BillingDetails</tt> from the set.     * <p>     * This method checks if the removed is the default element,     * and will throw a BusinessException if there is more than one     * left to chose from. This might actually not be the best way     * to handle this situation.     *     * @param billingDetails     * @throws BusinessException     */    public void removeBillingDetails(BillingDetails billingDetails)        throws BusinessException {        if (billingDetails == null)            throw new IllegalArgumentException("Can't add a null BillingDetails.");        if (getBillingDetails().size() >= 2) {            getBillingDetails().remove(billingDetails);            setDefaultBillingDetails((BillingDetails)getBillingDetails().iterator().next());        } else {            throw new BusinessException("Please set new default BillingDetails first");        }    }    public BillingDetails getDefaultBillingDetails() { return defaultBillingDetails; }    public void setDefaultBillingDetails(BillingDetails defaultBillingDetails) {        this.defaultBillingDetails = defaultBillingDetails;    }    public Collection<Item> getItemsForSale() { return itemsForSale; }    public void setItemsForSale(Collection<Item> itemsForSale) { this.itemsForSale = itemsForSale; }    public Set<Item> getBoughtItems() { return boughtItems; }    public void addBoughtItem(Item item) {        if (item == null) throw new IllegalArgumentException("Null Item!");        item.setBuyer(this);        boughtItems.add(item);    }    public Date getCreated() { return created; }    // ********************** Common Methods ********************** //    public boolean equals(Object o) {        if (this == o) return true;        if (!(o instanceof User)) return false;        final User user = (User) o;        return getUsername().equals(user.getUsername());    }    public int hashCode() {        return getUsername().hashCode();    }    public String toString() {        return  "User ('" + getId() + "'), " +                "Username: '" + getUsername() + "'";    }    public int compareTo(Object o) {        if (o instanceof User)            // Don't compare Date objects! Use the time in milliseconds!            return Long.valueOf(this.getCreated().getTime()).compareTo(                    Long.valueOf( ((User)o).getCreated().getTime())                   );        return 0;    }    // ********************** Business Methods ********************** //}