146 lines
3.3 KiB
Go
146 lines
3.3 KiB
Go
package zero
|
|
|
|
import (
|
|
"database/sql/driver"
|
|
"encoding/json"
|
|
"fmt"
|
|
"reflect"
|
|
"strconv"
|
|
|
|
"gopkg.in/nullbio/null.v4/convert"
|
|
)
|
|
|
|
type NullUint8 struct {
|
|
Uint8 uint8
|
|
Valid bool
|
|
}
|
|
|
|
// Uint8 is a nullable uint8.
|
|
// JSON marshals to zero if null.
|
|
// Considered null to SQL if zero.
|
|
type Uint8 struct {
|
|
NullUint8
|
|
}
|
|
|
|
// NewUint8 creates a new Uint8
|
|
func NewUint8(i uint8, valid bool) Uint8 {
|
|
return Uint8{
|
|
NullUint8: NullUint8{
|
|
Uint8: i,
|
|
Valid: valid,
|
|
},
|
|
}
|
|
}
|
|
|
|
// Uint8From creates a new Uint8 that will be null if zero.
|
|
func Uint8From(i uint8) Uint8 {
|
|
return NewUint8(i, i != 0)
|
|
}
|
|
|
|
// Uint8FromPtr creates a new Uint8 that be null if i is nil.
|
|
func Uint8FromPtr(i *uint8) Uint8 {
|
|
if i == nil {
|
|
return NewUint8(0, false)
|
|
}
|
|
n := NewUint8(*i, true)
|
|
return n
|
|
}
|
|
|
|
// UnmarshalJSON implements json.Unmarshaler.
|
|
// It supports number and null input.
|
|
// 0 will be considered a null Uint8.
|
|
// It also supports unmarshalling a sql.NullUint8.
|
|
func (i *Uint8) UnmarshalJSON(data []byte) error {
|
|
var err error
|
|
var v interface{}
|
|
if err = json.Unmarshal(data, &v); err != nil {
|
|
return err
|
|
}
|
|
switch v.(type) {
|
|
case float64:
|
|
// Unmarshal again, directly to uint8, to avoid intermediate float64
|
|
err = json.Unmarshal(data, &i.Uint8)
|
|
case map[string]interface{}:
|
|
err = json.Unmarshal(data, &i.NullUint8)
|
|
case nil:
|
|
i.Valid = false
|
|
return nil
|
|
default:
|
|
err = fmt.Errorf("json: cannot unmarshal %v into Go value of type zero.Uint8", reflect.TypeOf(v).Name())
|
|
}
|
|
i.Valid = (err == nil) && (i.Uint8 != 0)
|
|
return err
|
|
}
|
|
|
|
// UnmarshalText implements encoding.TextUnmarshaler.
|
|
// It will unmarshal to a null Uint8 if the input is a blank, zero, or not an integer.
|
|
// It will return an error if the input is not an integer, blank, or "null".
|
|
func (i *Uint8) UnmarshalText(text []byte) error {
|
|
str := string(text)
|
|
if str == "" || str == "null" {
|
|
i.Valid = false
|
|
return nil
|
|
}
|
|
var err error
|
|
res, err := strconv.ParseUint(string(text), 10, 8)
|
|
i.Uint8 = uint8(res)
|
|
i.Valid = (err == nil) && (i.Uint8 != 0)
|
|
return err
|
|
}
|
|
|
|
// MarshalJSON implements json.Marshaler.
|
|
// It will encode 0 if this Uint8 is null.
|
|
func (i Uint8) MarshalJSON() ([]byte, error) {
|
|
n := i.Uint8
|
|
if !i.Valid {
|
|
n = 0
|
|
}
|
|
return []byte(strconv.FormatUint(uint64(n), 10)), nil
|
|
}
|
|
|
|
// MarshalText implements encoding.TextMarshaler.
|
|
// It will encode a zero if this Uint8 is null.
|
|
func (i Uint8) MarshalText() ([]byte, error) {
|
|
n := i.Uint8
|
|
if !i.Valid {
|
|
n = 0
|
|
}
|
|
return []byte(strconv.FormatUint(uint64(n), 10)), nil
|
|
}
|
|
|
|
// SetValid changes this Uint8's value and also sets it to be non-null.
|
|
func (i *Uint8) SetValid(n uint8) {
|
|
i.Uint8 = n
|
|
i.Valid = true
|
|
}
|
|
|
|
// Ptr returns a pointer to this Uint8's value, or a nil pointer if this Uint8 is null.
|
|
func (i Uint8) Ptr() *uint8 {
|
|
if !i.Valid {
|
|
return nil
|
|
}
|
|
return &i.Uint8
|
|
}
|
|
|
|
// IsZero returns true for null or zero Uint8s, for future omitempty support (Go 1.4?)
|
|
func (i Uint8) IsZero() bool {
|
|
return !i.Valid || i.Uint8 == 0
|
|
}
|
|
|
|
// Scan implements the Scanner interface.
|
|
func (n *NullUint8) Scan(value interface{}) error {
|
|
if value == nil {
|
|
n.Uint8, n.Valid = 0, false
|
|
return nil
|
|
}
|
|
n.Valid = true
|
|
return convert.ConvertAssign(&n.Uint8, value)
|
|
}
|
|
|
|
// Value implements the driver Valuer interface.
|
|
func (n NullUint8) Value() (driver.Value, error) {
|
|
if !n.Valid {
|
|
return nil, nil
|
|
}
|
|
return int64(n.Uint8), nil
|
|
}
|