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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| // 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() | ||
| } |