130 lines
2.6 KiB
Go
130 lines
2.6 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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"encoding/json"
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"fmt"
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"math"
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"strconv"
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"gopkg.in/nullbio/null.v6/convert"
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)
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// Uint32 is an nullable uint32.
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type Uint32 struct {
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Uint32 uint32
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Valid bool
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}
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// NewUint32 creates a new Uint32
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func NewUint32(i uint32, valid bool) Uint32 {
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return Uint32{
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Uint32: i,
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Valid: valid,
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}
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}
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// Uint32From creates a new Uint32 that will always be valid.
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func Uint32From(i uint32) Uint32 {
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return NewUint32(i, true)
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}
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// Uint32FromPtr creates a new Uint32 that be null if i is nil.
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func Uint32FromPtr(i *uint32) Uint32 {
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if i == nil {
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return NewUint32(0, false)
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}
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return NewUint32(*i, true)
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}
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// UnmarshalJSON implements json.Unmarshaler.
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func (u *Uint32) UnmarshalJSON(data []byte) error {
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if bytes.Equal(data, NullBytes) {
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u.Valid = false
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u.Uint32 = 0
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return nil
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}
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var x uint64
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if err := json.Unmarshal(data, &x); err != nil {
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return err
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}
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if x > math.MaxUint32 {
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return fmt.Errorf("json: %d overflows max uint32 value", x)
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}
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u.Uint32 = uint32(x)
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u.Valid = true
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return nil
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}
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// UnmarshalText implements encoding.TextUnmarshaler.
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func (u *Uint32) UnmarshalText(text []byte) error {
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if text == nil || len(text) == 0 {
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u.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.ParseUint(string(text), 10, 32)
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u.Valid = err == nil
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if u.Valid {
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u.Uint32 = uint32(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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func (u Uint32) MarshalJSON() ([]byte, error) {
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if !u.Valid {
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return NullBytes, nil
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}
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return []byte(strconv.FormatUint(uint64(u.Uint32), 10)), nil
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}
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// MarshalText implements encoding.TextMarshaler.
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func (u Uint32) MarshalText() ([]byte, error) {
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if !u.Valid {
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return []byte{}, nil
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}
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return []byte(strconv.FormatUint(uint64(u.Uint32), 10)), nil
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}
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// SetValid changes this Uint32's value and also sets it to be non-null.
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func (u *Uint32) SetValid(n uint32) {
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u.Uint32 = n
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u.Valid = true
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}
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// Ptr returns a pointer to this Uint32's value, or a nil pointer if this Uint32 is null.
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func (u Uint32) Ptr() *uint32 {
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if !u.Valid {
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return nil
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}
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return &u.Uint32
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}
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// IsZero returns true for invalid Uint32's, for future omitempty support (Go 1.4?)
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func (u Uint32) IsZero() bool {
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return !u.Valid
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}
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// Scan implements the Scanner interface.
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func (u *Uint32) Scan(value interface{}) error {
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if value == nil {
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u.Uint32, u.Valid = 0, false
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return nil
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}
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u.Valid = true
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return convert.ConvertAssign(&u.Uint32, value)
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}
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// Value implements the driver Valuer interface.
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func (u Uint32) Value() (driver.Value, error) {
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if !u.Valid {
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return nil, nil
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}
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return uint64(u.Uint32), nil
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}
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