094289d4cf
Repo: github.com/lbryio/null.go git-subtree-dir: null git-subtree-mainline:75e2abdeacgit-subtree-split:109a79fb20
129 lines
2.5 KiB
Go
129 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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// Int16 is an nullable int16.
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type Int16 struct {
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Int16 int16
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Valid bool
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}
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// NewInt16 creates a new Int16
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func NewInt16(i int16, valid bool) Int16 {
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return Int16{
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Int16: i,
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Valid: valid,
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}
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}
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// Int16From creates a new Int16 that will always be valid.
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func Int16From(i int16) Int16 {
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return NewInt16(i, true)
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}
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// Int16FromPtr creates a new Int16 that be null if i is nil.
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func Int16FromPtr(i *int16) Int16 {
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if i == nil {
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return NewInt16(0, false)
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}
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return NewInt16(*i, true)
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}
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// UnmarshalJSON implements json.Unmarshaler.
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func (i *Int16) 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.Int16 = 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.MaxInt16 {
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return fmt.Errorf("json: %d overflows max int16 value", x)
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}
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i.Int16 = int16(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 *Int16) 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, 16)
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i.Valid = err == nil
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if i.Valid {
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i.Int16 = int16(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 Int16) 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.Int16), 10)), nil
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}
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// MarshalText implements encoding.TextMarshaler.
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func (i Int16) 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.Int16), 10)), nil
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}
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// SetValid changes this Int16's value and also sets it to be non-null.
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func (i *Int16) SetValid(n int16) {
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i.Int16 = n
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i.Valid = true
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}
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// Ptr returns a pointer to this Int16's value, or a nil pointer if this Int16 is null.
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func (i Int16) Ptr() *int16 {
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if !i.Valid {
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return nil
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}
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return &i.Int16
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}
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// IsNull returns true for invalid Int16's, for future omitempty support (Go 1.4?)
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func (i Int16) 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 *Int16) Scan(value interface{}) error {
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if value == nil {
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i.Int16, 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.Int16, value)
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}
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// Value implements the driver Valuer interface.
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func (i Int16) 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.Int16), nil
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}
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