Class ProductService

java.lang.Object

com.goldenleaf.shop.service.ProductService

@Service
public class ProductService
extends Object

Service class for managing Product entities.

Provides business logic for retrieving, adding, updating, and deleting products. Acts as an intermediary between controllers and the ProductRepository.

See Also:

• Product
• ProductRepository

Constructor Summary

Constructors

Constructor	Description
ProductService(ProductRepository repo)	Constructs a new ProductService with the provided repository.

Method Summary

Modifier and Type	Method	Description
void	addProduct(Product product)	Adds a new Product to the database.
void	editProduct(Product product)	Updates an existing Product.
List<Product>	getAllProducts()	Retrieves all products from the database.
Product	getProductByBrand(String brand)	Retrieves a Product by its brand.
Product	getProductById(Long id)	Retrieves a Product by its unique ID.
Product	getProductByName(String name)	Retrieves a Product by its name.
void	removeProduct(Product product)	Removes an existing Product from the database.
void	removeProductById(Long id)	Removes a Product by its ID.
void	removeProductByName(String name)	Removes a Product by its name.

Methods inherited from class java.lang.Object

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

Constructor Details

ProductService

public ProductService(ProductRepository repo)

Constructs a new ProductService with the provided repository.

Parameters:

repo - the repository used to perform operations on products

Throws:

IllegalArgumentException - if repo is null

See Also:

• ProductRepository

Method Details

getAllProducts

public List<Product> getAllProducts()

Retrieves all products from the database.

Returns:

a List of all Product entities

See Also:

• ListCrudRepository.findAll()

getProductById

public Product getProductById(Long id)

Retrieves a Product by its unique ID.

Parameters:

id - the ID of the product

Returns:

the Product with the specified ID

Throws:

RuntimeException - if no product with the given ID exists

See Also:

• CrudRepository.findById(Object)

getProductByName

public Product getProductByName(String name)

Retrieves a Product by its name.

Parameters:

name - the name of the product

Returns:

the Product with the specified name

Throws:

RuntimeException - if no product with the given name exists

See Also:

• ProductRepository.findByName(String)

getProductByBrand

public Product getProductByBrand(String brand)

Retrieves a Product by its brand.

Parameters:

brand - the brand of the product

Returns:

the Product with the specified brand

Throws:

RuntimeException - if no product with the given brand exists

See Also:

• ProductRepository.findByBrand(String)

addProduct

public void addProduct(Product product)

Adds a new Product to the database.

Parameters:

product - the product to add

See Also:

• CrudRepository.save(Object)

removeProduct

public void removeProduct(Product product)

Removes an existing Product from the database.

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

Parameters:

product - the product to remove

See Also:

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

removeProductById

public void removeProductById(Long id)

Removes a Product by its ID.

Parameters:

id - the ID of the product to delete

See Also:

• CrudRepository.deleteById(Object)

removeProductByName

public void removeProductByName(String name)

Removes a Product by its name.

Parameters:

name - the name of the product to delete

See Also:

• ProductRepository.deleteByName(String)

editProduct

public void editProduct(Product product)

Updates an existing Product.

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

Parameters:

product - the product to update

Throws:

RuntimeException - if the product does not exist or ID is null

See Also:

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