feat: domain finished

domain/entity/book/service.go

@@ -0,0 +1,56 @@
+package book
+
+import (
+	"strings"
+	"time"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+)
+
+//Service service interface
+type Service struct {
+	repo Repository
+}
+
+//NewService create new use case
+func NewService(r Repository) *Service {
+	return &Service{
+		repo: r,
+	}
+}
+
+//Create a book
+func (s *Service) Create(e *Book) (entity.ID, error) {
+	e.ID = entity.NewID()
+	e.CreatedAt = time.Now()
+	return s.repo.Create(e)
+}
+
+//Get a book
+func (s *Service) Get(id entity.ID) (*Book, error) {
+	return s.repo.Get(id)
+}
+
+//Search books
+func (s *Service) Search(query string) ([]*Book, error) {
+	return s.repo.Search(strings.ToLower(query))
+}
+
+//List books
+func (s *Service) List() ([]*Book, error) {
+	return s.repo.List()
+}
+
+//Delete a book
+func (s *Service) Delete(id entity.ID) error {
+	_, err := s.Get(id)
+	if err != nil {
+		return err
+	}
+	return s.repo.Delete(id)
+}
+
+//Update a book
+func (s *Service) Update(e *Book) error {
+	return s.repo.Update(e)
+}