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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"encoding/json"
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"strconv"
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"gopkg.in/nullbio/null.v6/convert"
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)
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// Uint is an nullable uint.
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type Uint struct {
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Uint uint
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Valid bool
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}
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// NewUint creates a new Uint
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func NewUint(i uint, valid bool) Uint {
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return Uint{
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Uint: i,
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Valid: valid,
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}
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}
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// UintFrom creates a new Uint that will always be valid.
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func UintFrom(i uint) Uint {
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return NewUint(i, true)
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}
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// UintFromPtr creates a new Uint that be null if i is nil.
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func UintFromPtr(i *uint) Uint {
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if i == nil {
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return NewUint(0, false)
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}
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return NewUint(*i, true)
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}
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// UnmarshalJSON implements json.Unmarshaler.
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func (u *Uint) 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.Uint = 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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u.Uint = uint(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 *Uint) 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, 0)
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u.Valid = err == nil
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if u.Valid {
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u.Uint = uint(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 Uint) 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.Uint), 10)), nil
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}
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// MarshalText implements encoding.TextMarshaler.
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func (u Uint) 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.Uint), 10)), nil
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}
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// SetValid changes this Uint's value and also sets it to be non-null.
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func (u *Uint) SetValid(n uint) {
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u.Uint = n
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u.Valid = true
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}
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// Ptr returns a pointer to this Uint's value, or a nil pointer if this Uint is null.
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func (u Uint) Ptr() *uint {
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if !u.Valid {
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return nil
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}
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return &u.Uint
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}
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// IsNull returns true for invalid Uints, for future omitempty support (Go 1.4?)
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func (u Uint) IsNull() 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 *Uint) Scan(value interface{}) error {
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if value == nil {
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u.Uint, 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.Uint, value)
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}
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// Value implements the driver Valuer interface.
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func (u Uint) 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 int64(u.Uint), nil
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}
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