Package com.example.blogs.app.api.user.service

Class UserServiceImpl

java.lang.Object

com.example.blogs.app.api.user.service.UserServiceImpl

All Implemented Interfaces:

UserService

@Service
public class UserServiceImpl
extends Object
implements UserService

Orchestrates user operations by coordinating repository access, post retrieval, and entity-to-DTO mapping.

Constructor Summary

Constructors

Constructor	Description
UserServiceImpl()

Method Summary

Modifier and Type	Method	Description
UserEntity	createUser(CreateUserCommand command)	Creates a new user in the system.
UserDTO	getUserByUsername(String username)	Retrieves complete user profile with posts by username.
UserEntity	getUserByUsernameOrEmail(String usernameOrEmail)	Retrieves a user by username or email address.
UpdateUserResponseDTO	updateUserProfile(Long id, UpdateUserRequestDTO requestDTO, MultipartFile profilePicture)	Updates user profile with optional field updates and profile picture replacement.

Methods inherited from class java.lang.Object

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

Constructor Details

UserServiceImpl

public UserServiceImpl()

Method Details

createUser

public UserEntity createUser(CreateUserCommand command)

Description copied from interface: UserService

Creates a new user in the system.

Specified by:

createUser in interface UserService

Parameters:

command - user creation details

Returns:

the persisted user entity

getUserByUsernameOrEmail

public UserEntity getUserByUsernameOrEmail(String usernameOrEmail)

Description copied from interface: UserService

Retrieves a user by username or email address.

Specified by:

getUserByUsernameOrEmail in interface UserService

Parameters:

usernameOrEmail - the username or email to search for

Returns:

the matching user entity

getUserByUsername

public UserDTO getUserByUsername(String username)

Retrieves complete user profile with posts by username. Fetches user entity, loads associated posts, and maps to DTO.

Specified by:

getUserByUsername in interface UserService

Parameters:

username - the username to search for

Returns:

user data transfer object with profile information and post summaries

Throws:

UserNotFoundException - if no user is found

FailedToFindUserException - for database errors

updateUserProfile

@Transactional
public UpdateUserResponseDTO updateUserProfile(Long id,
 UpdateUserRequestDTO requestDTO,
 MultipartFile profilePicture)

Updates user profile with optional field updates and profile picture replacement. Supports partial updates - only non-null fields are modified. If a new profile picture is provided, the old one is deleted after successful update.

Specified by:

updateUserProfile in interface UserService

Parameters:

id - the user ID to update

requestDTO - DTO containing fields to update (all fields optional)

profilePicture - optional new profile picture file

Returns:

response DTO with updated profile information

Throws:

UserNotFoundException - if user with given ID is not found

UsernameTakenException - if new username is already taken

EmailTakenException - if new email is already taken

FailedToUpdateUserException - for database update failures