123 lines
2.4 KiB
Go
123 lines
2.4 KiB
Go
package null
|
|
|
|
import (
|
|
"bytes"
|
|
"database/sql/driver"
|
|
"fmt"
|
|
"time"
|
|
)
|
|
|
|
// Time is a nullable time.Time. It supports SQL and JSON serialization.
|
|
type Time struct {
|
|
Time time.Time
|
|
Valid bool
|
|
}
|
|
|
|
// 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.
|
|
func (t Time) MarshalJSON() ([]byte, error) {
|
|
if !t.Valid {
|
|
return NullBytes, nil
|
|
}
|
|
return t.Time.MarshalJSON()
|
|
}
|
|
|
|
// UnmarshalJSON implements json.Unmarshaler.
|
|
func (t *Time) UnmarshalJSON(data []byte) error {
|
|
if bytes.Equal(data, NullBytes) {
|
|
t.Valid = false
|
|
t.Time = time.Time{}
|
|
return nil
|
|
}
|
|
|
|
if err := t.Time.UnmarshalJSON(data); err != nil {
|
|
return err
|
|
}
|
|
|
|
t.Valid = true
|
|
return nil
|
|
}
|
|
|
|
// MarshalText implements encoding.TextMarshaler.
|
|
func (t Time) MarshalText() ([]byte, error) {
|
|
if !t.Valid {
|
|
return NullBytes, nil
|
|
}
|
|
return t.Time.MarshalText()
|
|
}
|
|
|
|
// UnmarshalText implements encoding.TextUnmarshaler.
|
|
func (t *Time) UnmarshalText(text []byte) error {
|
|
if text == nil || len(text) == 0 {
|
|
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
|
|
}
|
|
|
|
// IsNull returns true for invalid Times, for future omitempty support (Go 1.4?)
|
|
func (t Time) IsNull() bool {
|
|
return !t.Valid
|
|
}
|
|
|
|
// 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
|
|
}
|