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