094289d4cf
Repo: github.com/lbryio/null.go git-subtree-dir: null git-subtree-mainline:75e2abdeacgit-subtree-split:109a79fb20
130 lines
2.5 KiB
Go
130 lines
2.5 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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// Int32 is an nullable int32.
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type Int32 struct {
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Int32 int32
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Valid bool
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}
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// NewInt32 creates a new Int32
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func NewInt32(i int32, valid bool) Int32 {
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return Int32{
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Int32: i,
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Valid: valid,
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}
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}
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// Int32From creates a new Int32 that will always be valid.
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func Int32From(i int32) Int32 {
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return NewInt32(i, true)
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}
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// Int32FromPtr creates a new Int32 that be null if i is nil.
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func Int32FromPtr(i *int32) Int32 {
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if i == nil {
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return NewInt32(0, false)
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}
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return NewInt32(*i, true)
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}
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// UnmarshalJSON implements json.Unmarshaler.
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func (i *Int32) UnmarshalJSON(data []byte) error {
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if bytes.Equal(data, NullBytes) {
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i.Valid = false
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i.Int32 = 0
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return nil
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}
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var x int64
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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.MaxInt32 {
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return fmt.Errorf("json: %d overflows max int32 value", x)
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}
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i.Int32 = int32(x)
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i.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 (i *Int32) UnmarshalText(text []byte) error {
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if text == nil || len(text) == 0 {
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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, 32)
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i.Valid = err == nil
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if i.Valid {
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i.Int32 = int32(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 (i Int32) MarshalJSON() ([]byte, error) {
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if !i.Valid {
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return NullBytes, nil
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}
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return []byte(strconv.FormatInt(int64(i.Int32), 10)), nil
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}
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// MarshalText implements encoding.TextMarshaler.
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func (i Int32) 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.Int32), 10)), nil
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}
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// SetValid changes this Int32's value and also sets it to be non-null.
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func (i *Int32) SetValid(n int32) {
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i.Int32 = n
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i.Valid = true
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}
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// Ptr returns a pointer to this Int32's value, or a nil pointer if this Int32 is null.
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func (i Int32) Ptr() *int32 {
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if !i.Valid {
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return nil
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}
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return &i.Int32
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}
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// IsNull returns true for invalid Int32's, for future omitempty support (Go 1.4?)
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func (i Int32) IsNull() 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 (i *Int32) Scan(value interface{}) error {
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if value == nil {
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i.Int32, i.Valid = 0, false
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return nil
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}
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i.Valid = true
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return convert.ConvertAssign(&i.Int32, value)
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}
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// Value implements the driver Valuer interface.
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func (i Int32) Value() (driver.Value, error) {
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if !i.Valid {
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return nil, nil
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}
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return int64(i.Int32), nil
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}
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