Package org.example.crmedu.domain.service.subject

Interface SubjectService

All Known Implementing Classes:

SubjectServiceImpl

public interface SubjectService

Service interface for managing Subject entities. Defines methods for CRUD operations and querying subjects.

Method Summary

Modifier and Type	Method	Description
Subject	create(Subject subject)	Creates a new subject.
void	delete(Long id)	Deletes a subject by its unique identifier.
Page<Subject>	findAll(int pageNumber, int pageSize)	Retrieves a paginated list of subjects.
Subject	findById(Long id)	Retrieves a subject by its unique identifier.
void	update(Subject subject, Long id)	Updates an existing subject

Method Details

create

Subject create(Subject subject)

Creates a new subject.

Parameters:

subject - the subject to create

Returns:

the created Subject

Throws:

EntityExistsException - if a subject with the same name already exists or if an organization, which subject belongs, not exist

findById

Subject findById(Long id)

Retrieves a subject by its unique identifier.

Parameters:

id - the unique identifier of the subject

Returns:

the found Subject

Throws:

EntityNotFoundException - if no subject with the given ID is found

findAll

Page<Subject> findAll(int pageNumber,
 int pageSize)

Retrieves a paginated list of subjects.

Parameters:

pageNumber - the page number (starting from 0)

pageSize - the number of subjects per page

Returns:

a Page containing the requested subjects

update

void update(Subject subject,
 Long id)

Updates an existing subject

Parameters:

subject - the updated subject data

id - the unique identifier of the subject to update

Throws:

EntityNotFoundException - if no subject with the given ID is found or if an organization, which subject belongs, not exist

EntityExistsException - if a subject with the same name already exists

delete

void delete(Long id)

Deletes a subject by its unique identifier.

Parameters:

id - the unique identifier of the subject to delete