Class ShoppingCartService

java.lang.Object

com.goldenleaf.shop.service.ShoppingCartService

@Service
public class ShoppingCartService
extends Object

Service class for managing ShoppingCart entities.

Provides business logic for retrieving, adding, updating, and deleting shopping carts. Supports operations by Customer and cart ID. Acts as an intermediary between controllers and the ShoppingCartRepository.

See Also:

• ShoppingCart
• ShoppingCartRepository
• Customer

Constructor Summary

Constructors

Constructor	Description
ShoppingCartService(ShoppingCartRepository repo)	Constructs a new ShoppingCartService with the provided repository.

Method Summary

Modifier and Type	Method	Description
void	addShoppingCart(ShoppingCart cart)	Adds a new ShoppingCart to the database.
void	editShoppingCart(ShoppingCart cart)	Updates an existing ShoppingCart.
List<ShoppingCart>	getAllShoppingCarts()	Retrieves all shopping carts from the database.
ShoppingCart	getShoppingCartByCustomer(Customer customer)	Retrieves a ShoppingCart for a specific Customer.
ShoppingCart	getShoppingCartById(Long id)	Retrieves a ShoppingCart by its unique ID.
void	removeShoppingCart(ShoppingCart cart)	Removes an existing ShoppingCart from the database.
void	removeShoppingCartByCustomer(Customer customer)	Removes a ShoppingCart associated with a specific Customer.
void	removeShoppingCartById(Long id)	Removes a ShoppingCart by its ID.

Methods inherited from class java.lang.Object

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

Constructor Details

ShoppingCartService

public ShoppingCartService(ShoppingCartRepository repo)

Constructs a new ShoppingCartService with the provided repository.

Parameters:

repo - the repository used to perform operations on shopping carts

Throws:

IllegalArgumentException - if repo is null

See Also:

• ShoppingCartRepository

Method Details

getAllShoppingCarts

public List<ShoppingCart> getAllShoppingCarts()

Retrieves all shopping carts from the database.

Returns:

a List of all ShoppingCart entities

See Also:

• ListCrudRepository.findAll()

getShoppingCartById

public ShoppingCart getShoppingCartById(Long id)

Retrieves a ShoppingCart by its unique ID.

Parameters:

id - the ID of the shopping cart

Returns:

the ShoppingCart with the specified ID

Throws:

RuntimeException - if no shopping cart with the given ID exists

See Also:

• CrudRepository.findById(Object)

getShoppingCartByCustomer

public ShoppingCart getShoppingCartByCustomer(Customer customer)

Retrieves a ShoppingCart for a specific Customer.

Parameters:

customer - the customer whose shopping cart is retrieved

Returns:

the ShoppingCart for the given customer

Throws:

RuntimeException - if no shopping cart exists for the given customer

See Also:

• ShoppingCartRepository.findByCustomer(Customer)

addShoppingCart

public void addShoppingCart(ShoppingCart cart)

Adds a new ShoppingCart to the database.

Parameters:

cart - the shopping cart to add

See Also:

• CrudRepository.save(Object)

removeShoppingCart

public void removeShoppingCart(ShoppingCart cart)

Removes an existing ShoppingCart from the database.

If the shopping cart exists (by ID), it will be deleted; otherwise, nothing happens.

Parameters:

cart - the shopping cart to remove

See Also:

• CrudRepository.delete(Object)
• CrudRepository.existsById(Object)

removeShoppingCartById

public void removeShoppingCartById(Long id)

Removes a ShoppingCart by its ID.

Parameters:

id - the ID of the shopping cart to delete

See Also:

• CrudRepository.deleteById(Object)

removeShoppingCartByCustomer

public void removeShoppingCartByCustomer(Customer customer)
                                  throws EmptyLoginException

Removes a ShoppingCart associated with a specific Customer.

Parameters:

customer - the customer whose shopping cart should be deleted

Throws:

EmptyLoginException - if no shopping cart exists for the given customer

See Also:

• ShoppingCartRepository.findByCustomer(Customer)
• CrudRepository.delete(Object)

editShoppingCart

public void editShoppingCart(ShoppingCart cart)

Updates an existing ShoppingCart.

The shopping cart must have a valid ID that exists in the database. Otherwise, a RuntimeException is thrown.

Parameters:

cart - the shopping cart to update

Throws:

RuntimeException - if the shopping cart does not exist or ID is null

See Also:

• CrudRepository.save(Object)
• CrudRepository.existsById(Object)