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department_api.go
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/
department_api.go
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package server
import "net/http"
type DepartmentAPI struct {
db *DB
}
func NewDepartmentAPI(db *DB) *DepartmentAPI {
return &DepartmentAPI{db}
}
func (departmentAPI *DepartmentAPI) GetTreeHandler(context *HandlerContext) (interface{}, *HandlerError) {
departments, err := departmentAPI.getTree(nil)
if err != nil {
return nil, &HandlerError{err, "couldn't retrieve departments", http.StatusInternalServerError}
}
return departments, nil
}
func (departmentAPI *DepartmentAPI) GetListHandler(context *HandlerContext) (interface{}, *HandlerError) {
departments, err := departmentAPI.getList(nil)
if err != nil {
return nil, &HandlerError{err, "couldn't retrieve departments", http.StatusInternalServerError}
}
return departments, nil
}
func (departmentAPI *DepartmentAPI) SaveHandler(context *HandlerContext) (interface{}, *HandlerError) {
var department Department
err := context.GetReqBodyJSON(&department)
if err != nil {
return nil, &HandlerError{err, err.Error(), http.StatusBadRequest}
}
err = departmentAPI.save(&department)
if err != nil {
if err == errOptimisticLocking {
return nil, &HandlerError{err, "Error: Department was changed/deleted by another user.", http.StatusInternalServerError}
}
return nil, &HandlerError{err, "Error: Department could not be saved.", http.StatusInternalServerError}
}
return department, nil
}
func (departmentAPI *DepartmentAPI) DeleteHandler(context *HandlerContext) (interface{}, *HandlerError) {
id, err := context.GetRouteVarInt("id")
if err != nil {
return nil, &HandlerError{err, err.Error(), http.StatusBadRequest}
}
err = departmentAPI.delete(id)
if err != nil {
if err == errItemInUse {
return nil, &HandlerError{err, "Error: This department, or one of its descendants, is in use.", http.StatusBadRequest}
}
return nil, &HandlerError{err, "Error: Department could not deleted.", http.StatusInternalServerError}
}
return &SingleValue{true}, nil
}
func (departmentAPI *DepartmentAPI) getTree(parent *Department) ([]Department, error) {
departments, err := departmentAPI.db.GetDepartments(parent)
if err != nil {
return nil, err
}
for i := range departments {
departments[i].Departments, err = departmentAPI.getTree(&departments[i])
if err != nil {
return nil, err
}
}
return departments, nil
}
func (departmentAPI *DepartmentAPI) getList(parent *Department) ([]Department, error) {
departments, err := departmentAPI.db.GetDepartments(parent)
if err != nil {
return nil, err
}
for i := 0; i < len(departments); i++ {
children, err := departmentAPI.getList(&departments[i])
if err != nil {
return nil, err
}
// inserting children into slice after parent
slicingIndex := i + 1
departments = append(departments[:slicingIndex], append(children, departments[slicingIndex:]...)...)
i += len(children)
}
return departments, nil
}
func (departmentAPI *DepartmentAPI) save(department *Department) error {
return departmentAPI.db.SaveDepartment(department)
}
func (departmentAPI *DepartmentAPI) delete(id int) error {
department, err := departmentAPI.db.GetDepartment(id)
if err != nil {
return err
}
isReferenced, err := departmentAPI.db.IsDepartmentReferenced(department)
if err != nil {
return err
} else if isReferenced {
return errItemInUse
}
err = departmentAPI.db.DeleteDepartment(department)
if err != nil {
return err
}
return nil
}