Class CategoryService

java.lang.Object

com.goldenleaf.shop.service.CategoryService

@Service
public class CategoryService
extends Object

Service class for managing Category entities.

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

See Also:

• Category
• CategoryRepository

Constructor Summary

Constructors

Constructor	Description
CategoryService(CategoryRepository repo)	Constructs a new CategoryService with the provided repository.

Method Summary

Modifier and Type	Method	Description
void	addCategory(Category category)	Adds a new Category to the database.
void	editCategory(Category category)	Updates an existing Category.
List<Category>	getAllCategories()	Retrieves all categories from the database.
Category	getCategoryById(Long id)	Retrieves a Category by its unique ID.
Category	getCategoryByName(String name)	Retrieves a Category by its unique name.
void	removeCategory(Category category)	Removes an existing Category from the database.
void	removeCategoryById(Long id)	Removes a Category by its ID.
void	removeCategoryByName(String name)	Removes a Category by its name.

Methods inherited from class java.lang.Object

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

Constructor Details

CategoryService

public CategoryService(CategoryRepository repo)

Constructs a new CategoryService with the provided repository.

Parameters:

repo - the repository used to perform operations on categories

Throws:

IllegalArgumentException - if repo is null

See Also:

• CategoryRepository

Method Details

getAllCategories

public List<Category> getAllCategories()

Retrieves all categories from the database.

Returns:

a List of all Category entities

See Also:

• ListCrudRepository.findAll()

getCategoryById

public Category getCategoryById(Long id)

Retrieves a Category by its unique ID.

Parameters:

id - the ID of the category

Returns:

the Category with the specified ID

Throws:

RuntimeException - if no category with the given ID exists

See Also:

• CrudRepository.findById(Object)

getCategoryByName

public Category getCategoryByName(String name)

Retrieves a Category by its unique name.

Parameters:

name - the name of the category

Returns:

the Category with the specified name

Throws:

RuntimeException - if no category with the given name exists

See Also:

• CategoryRepository.findByName(String)

addCategory

public void addCategory(Category category)

Adds a new Category to the database.

Parameters:

category - the category to add

See Also:

• CrudRepository.save(Object)

removeCategory

public void removeCategory(Category category)

Removes an existing Category from the database.

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

Parameters:

category - the category to remove

See Also:

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

removeCategoryById

public void removeCategoryById(Long id)

Removes a Category by its ID.

Parameters:

id - the ID of the category to delete

See Also:

• CrudRepository.deleteById(Object)

removeCategoryByName

public void removeCategoryByName(String name)

Removes a Category by its name.

Parameters:

name - the name of the category to delete

Throws:

RuntimeException - if no category with the given name exists

See Also:

• CategoryRepository.findByName(String)
• CrudRepository.delete(Object)

editCategory

public void editCategory(Category category)

Updates an existing Category.

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

Parameters:

category - the category to update

Throws:

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

See Also:

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