Method Fill

container.go:253–299

Fill takes a struct and resolves the fields with the tag `container:"inject"`

(structure interface{})

// Fill takes a struct and resolves the fields with the tag `container:"inject"`
func (c Container) Fill(structure interface{}) error {
	receiverType := reflect.TypeOf(structure)
	if receiverType == nil {
		return errors.New("container: invalid structure")
	}

	if receiverType.Kind() == reflect.Ptr {
		elem := receiverType.Elem()
		if elem.Kind() == reflect.Struct {
			s := reflect.ValueOf(structure).Elem()

			for i := 0; i < s.NumField(); i++ {
				f := s.Field(i)

				if t, exist := s.Type().Field(i).Tag.Lookup("container"); exist {
					var name string

					if t == "type" {
						name = ""
					} else if t == "name" {
						name = s.Type().Field(i).Name
					} else {
						return fmt.Errorf("container: %v has an invalid struct tag", s.Type().Field(i).Name)
					}

					if concrete, exist := c[f.Type()][name]; exist {
						instance, err := concrete.make(c)
						if err != nil {
							return err
						}

						ptr := reflect.NewAt(f.Type(), unsafe.Pointer(f.UnsafeAddr())).Elem()
						ptr.Set(reflect.ValueOf(instance))

						continue
					}

					return fmt.Errorf("container: cannot make %v field", s.Type().Field(i).Name)
				}
			}

			return nil
		}
	}

	return errors.New("container: invalid structure")
}