openbook.domain

Class ShoppingCart

java.lang.Object

openbook.domain.ShoppingCart

All Implemented Interfaces:

Serializable

public class ShoppingCart
extends Object
implements Serializable

A non-persistent entity holds the content of a shopping session for a Customer. Used to create a persistent PurchaseOrder. Books can be added or removed from this cart.

Author:

Pinaki Poddar

See Also:

Serialized Form

Method Summary

Methods

Modifier and Type	Method and Description
void	addItem(Book book, int quantity) Add the given book with the given quantity in the cart.
void	changeQuantity(Book book, int delta) Change the quantity of the given book by the given delta.
void	clear()
Customer	getCustomer() Gets the Customer who owns this cart.
Map<Book,Integer>	getItems() Gets the books with their corresponding quantity in this cart.
int	getTotalCount()
boolean	isEmpty()
void	remove(Book book) Removes the given book from this cart.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getCustomer

public Customer getCustomer()

Gets the Customer who owns this cart.

Returns:

non-null Customer.

getItems

public Map<Book,Integer> getItems()

Gets the books with their corresponding quantity in this cart.

addItem

public void addItem(Book book,
           int quantity)

Add the given book with the given quantity in the cart. If the book already exists then the quantity is added to the existing quantity.

Parameters:

book - non-null Book

quantity - a positive quantity.

changeQuantity

public void changeQuantity(Book book,
                  int delta)

Change the quantity of the given book by the given delta.

Parameters:

book - a non-null Book that must exist in this cart.

delta - no. of quantity to change. Can be positive or negative. If the resultant quantity becomes zero of negative, the book is removed from the cart.

remove

public void remove(Book book)

Removes the given book from this cart.

Parameters:

book - book a non-null Book that must exist in this cart.

clear

public void clear()

isEmpty

public boolean isEmpty()

getTotalCount

public int getTotalCount()