You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
1.8 KiB
Go
87 lines
1.8 KiB
Go
// Copyright (c) 2014, Greg Roseberry
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package null
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"reflect"
|
|
"time"
|
|
)
|
|
|
|
// Time is a nullable time.Time.
|
|
// JSON marshals to the zero value for time.Time if null.
|
|
// Considered to be null to SQL if zero.
|
|
type Time struct {
|
|
Time time.Time
|
|
Valid bool
|
|
}
|
|
|
|
// 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 v.(type) {
|
|
case string:
|
|
err = t.Time.UnmarshalJSON(data)
|
|
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
|
|
}
|
|
|
|
// ValueOrZero returns the inner value if valid, otherwise zero.
|
|
func (t Time) ValueOrZero() time.Time {
|
|
if !t.Valid {
|
|
return time.Time{}
|
|
}
|
|
return t.Time
|
|
}
|
|
|
|
// IsZero returns true for null or zero Times, for
|
|
// potential future omitempty support.
|
|
func (t Time) IsZero() bool {
|
|
return !t.Valid || t.Time.IsZero()
|
|
}
|
|
|
|
// Ptr returns a pointer to this Time's value,
|
|
// or a nil pointer if this Time is zero.
|
|
func (t Time) Ptr() *time.Time {
|
|
if !t.Valid {
|
|
return nil
|
|
}
|
|
return &t.Time
|
|
}
|
|
|
|
// 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, !t.IsZero())
|
|
} |