ShoppingCart (OpenJPA Parent POM 4.0.0 API)

java.lang.Object
- openbook.domain.ShoppingCart

All Implemented Interfaces:

java.io.Serializable
```
public class ShoppingCart
extends java.lang.Object
implements java.io.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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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.
`java.util.Map<Book,java.lang.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 java.util.Map<Book,java.lang.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()
```