147 lines
3.3 KiB
Go
147 lines
3.3 KiB
Go
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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"strconv"
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"gopkg.in/nullbio/null.v5/convert"
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)
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// NullInt8 is a replica of sql.NullInt64 for int8 types.
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type NullInt8 struct {
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Int8 int8
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Valid bool
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}
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// Int8 is an nullable int8.
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// It does not consider zero values to be null.
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// It will decode to null, not zero, if null.
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type Int8 struct {
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NullInt8
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}
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// NewInt8 creates a new Int8
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func NewInt8(i int8, valid bool) Int8 {
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return Int8{
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NullInt8: NullInt8{
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Int8: i,
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Valid: valid,
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},
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}
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}
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// Int8From creates a new Int8 that will always be valid.
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func Int8From(i int8) Int8 {
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return NewInt8(i, true)
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}
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// Int8FromPtr creates a new Int8 that be null if i is nil.
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func Int8FromPtr(i *int8) Int8 {
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if i == nil {
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return NewInt8(0, false)
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}
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return NewInt8(*i, true)
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}
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// UnmarshalJSON implements json.Unmarshaler.
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// It supports number and null input.
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// 0 will not be considered a null Int8.
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// It also supports unmarshalling a sql.NullInt8.
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func (i *Int8) 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 v.(type) {
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case float64:
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// Unmarshal again, directly to int8, to avoid intermediate float64
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err = json.Unmarshal(data, &i.Int8)
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case map[string]interface{}:
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err = json.Unmarshal(data, &i.NullInt8)
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case nil:
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i.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.Int8", reflect.TypeOf(v).Name())
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}
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i.Valid = err == nil
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return err
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}
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// UnmarshalText implements encoding.TextUnmarshaler.
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// It will unmarshal to a null Int8 if the input is a blank or not an integer.
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// It will return an error if the input is not an integer, blank, or "null".
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func (i *Int8) UnmarshalText(text []byte) error {
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str := string(text)
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if str == "" || str == "null" {
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i.Valid = false
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return nil
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}
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var err error
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res, err := strconv.ParseInt(string(text), 10, 8)
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i.Valid = err == nil
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if i.Valid {
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i.Int8 = int8(res)
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}
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return err
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}
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// MarshalJSON implements json.Marshaler.
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// It will encode null if this Int8 is null.
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func (i Int8) MarshalJSON() ([]byte, error) {
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if !i.Valid {
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return []byte("null"), nil
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}
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return []byte(strconv.FormatInt(int64(i.Int8), 10)), nil
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}
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// MarshalText implements encoding.TextMarshaler.
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// It will encode a blank string if this Int8 is null.
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func (i Int8) MarshalText() ([]byte, error) {
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if !i.Valid {
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return []byte{}, nil
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}
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return []byte(strconv.FormatInt(int64(i.Int8), 10)), nil
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}
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// SetValid changes this Int8's value and also sets it to be non-null.
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func (i *Int8) SetValid(n int8) {
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i.Int8 = n
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i.Valid = true
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}
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// Ptr returns a pointer to this Int8's value, or a nil pointer if this Int8 is null.
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func (i Int8) Ptr() *int8 {
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if !i.Valid {
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return nil
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}
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return &i.Int8
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}
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// IsZero returns true for invalid Int8's, for future omitempty support (Go 1.4?)
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// A non-null Int8 with a 0 value will not be considered zero.
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func (i Int8) IsZero() bool {
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return !i.Valid
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}
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// Scan implements the Scanner interface.
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func (n *NullInt8) Scan(value interface{}) error {
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if value == nil {
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n.Int8, n.Valid = 0, false
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return nil
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}
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n.Valid = true
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return convert.ConvertAssign(&n.Int8, value)
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}
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// Value implements the driver Valuer interface.
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func (n NullInt8) Value() (driver.Value, error) {
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if !n.Valid {
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return nil, nil
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}
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return int64(n.Int8), nil
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}
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