118 lines
2.3 KiB
Go
118 lines
2.3 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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"github.com/nullbio/null/convert"
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)
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// Int64 is an nullable int64.
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type Int64 struct {
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Int64 int64
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Valid bool
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}
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// NewInt64 creates a new Int64
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func NewInt64(i int64, valid bool) Int64 {
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return Int64{
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Int64: i,
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Valid: valid,
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}
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}
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// Int64From creates a new Int64 that will always be valid.
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func Int64From(i int64) Int64 {
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return NewInt64(i, true)
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}
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// Int64FromPtr creates a new Int64 that be null if i is nil.
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func Int64FromPtr(i *int64) Int64 {
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if i == nil {
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return NewInt64(0, false)
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}
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return NewInt64(*i, true)
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}
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// UnmarshalJSON implements json.Unmarshaler.
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func (i *Int64) 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.Int64 = 0
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return nil
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}
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if err := json.Unmarshal(data, &i.Int64); err != nil {
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return err
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}
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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 *Int64) 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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i.Int64, err = strconv.ParseInt(string(text), 10, 64)
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i.Valid = err == nil
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return err
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}
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// MarshalJSON implements json.Marshaler.
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func (i Int64) 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(i.Int64, 10)), nil
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}
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// MarshalText implements encoding.TextMarshaler.
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func (i Int64) 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(i.Int64, 10)), nil
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}
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// SetValid changes this Int64's value and also sets it to be non-null.
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func (i *Int64) SetValid(n int64) {
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i.Int64 = n
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i.Valid = true
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}
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// Ptr returns a pointer to this Int64's value, or a nil pointer if this Int64 is null.
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func (i Int64) Ptr() *int64 {
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if !i.Valid {
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return nil
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}
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return &i.Int64
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}
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// IsZero returns true for invalid Int64's, for future omitempty support (Go 1.4?)
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func (i Int64) 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 (i *Int64) Scan(value interface{}) error {
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if value == nil {
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i.Int64, 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.Int64, value)
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}
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// Value implements the driver Valuer interface.
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func (i Int64) 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 i.Int64, nil
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}
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