094289d4cf
Repo: github.com/lbryio/null.go git-subtree-dir: null git-subtree-mainline:75e2abdeacgit-subtree-split:109a79fb20
124 lines
2.4 KiB
Go
124 lines
2.4 KiB
Go
package null
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import (
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"bytes"
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"database/sql/driver"
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"fmt"
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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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type Time struct {
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Time time.Time
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Valid bool
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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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// MarshalJSON implements json.Marshaler.
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func (t Time) MarshalJSON() ([]byte, error) {
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if !t.Valid {
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return NullBytes, 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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func (t *Time) UnmarshalJSON(data []byte) error {
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if bytes.Equal(data, NullBytes) {
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t.Valid = false
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t.Time = time.Time{}
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return nil
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}
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if err := t.Time.UnmarshalJSON(data); 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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// MarshalText implements encoding.TextMarshaler.
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func (t Time) MarshalText() ([]byte, error) {
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if !t.Valid {
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return NullBytes, nil
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}
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return t.Time.MarshalText()
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}
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// UnmarshalText implements encoding.TextUnmarshaler.
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func (t *Time) UnmarshalText(text []byte) error {
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if text == nil || len(text) == 0 {
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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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// IsNull returns true for invalid Times, for future omitempty support (Go 1.4?)
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func (t Time) IsNull() bool {
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return !t.Valid
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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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