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|
package null
import (
"database/sql/driver"
"encoding/json"
"fmt"
"reflect"
"time"
)
// Time is a nullable time.Time. It supports SQL and JSON serialization.
// It will marshal to null if null.
type Time struct {
Time time.Time
Valid bool
}
// Scan implements the Scanner interface.
func (t *Time) Scan(value interface{}) error {
var err error
switch x := value.(type) {
case time.Time:
t.Time = x
case nil:
t.Valid = false
return nil
default:
err = fmt.Errorf("null: cannot scan type %T into null.Time: %v", value, value)
}
t.Valid = err == nil
return err
}
// Value implements the driver Valuer interface.
func (t Time) Value() (driver.Value, error) {
if !t.Valid {
return nil, nil
}
return t.Time, nil
}
// NewTime creates a new Time.
func NewTime(t time.Time, valid bool) Time {
return Time{
Time: t,
Valid: valid,
}
}
// TimeFrom creates a new Time that will always be valid.
func TimeFrom(t time.Time) Time {
return NewTime(t, true)
}
// TimeFromPtr creates a new Time that will be null if t is nil.
func TimeFromPtr(t *time.Time) Time {
if t == nil {
return NewTime(time.Time{}, false)
}
return NewTime(*t, true)
}
// MarshalJSON implements json.Marshaler.
// It will encode null if this time is null.
func (t Time) MarshalJSON() ([]byte, error) {
if !t.Valid {
return []byte("null"), nil
}
return t.Time.MarshalJSON()
}
// UnmarshalJSON implements json.Unmarshaler.
// It supports string, object (e.g. pq.NullTime and friends)
// and null input.
func (t *Time) UnmarshalJSON(data []byte) error {
var err error
var v interface{}
if err = json.Unmarshal(data, &v); err != nil {
return err
}
switch x := v.(type) {
case string:
err = t.Time.UnmarshalJSON(data)
case map[string]interface{}:
ti, tiOK := x["Time"].(string)
valid, validOK := x["Valid"].(bool)
if !tiOK || !validOK {
return fmt.Errorf(`json: unmarshalling object into Go value of type null.Time requires key "Time" to be of type string and key "Valid" to be of type bool; found %T and %T, respectively`, x["Time"], x["Valid"])
}
err = t.Time.UnmarshalText([]byte(ti))
t.Valid = valid
return err
case nil:
t.Valid = false
return nil
default:
err = fmt.Errorf("json: cannot unmarshal %v into Go value of type null.Time", reflect.TypeOf(v).Name())
}
t.Valid = err == nil
return err
}
func (t Time) MarshalText() ([]byte, error) {
if !t.Valid {
return []byte("null"), nil
}
return t.Time.MarshalText()
}
func (t *Time) UnmarshalText(text []byte) error {
str := string(text)
if str == "" || str == "null" {
t.Valid = false
return nil
}
if err := t.Time.UnmarshalText(text); err != nil {
return err
}
t.Valid = true
return nil
}
// SetValid changes this Time's value and sets it to be non-null.
func (t *Time) SetValid(v time.Time) {
t.Time = v
t.Valid = true
}
// Ptr returns a pointer to this Time's value, or a nil pointer if this Time is null.
func (t Time) Ptr() *time.Time {
if !t.Valid {
return nil
}
return &t.Time
}
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