094289d4cf
Repo: github.com/lbryio/null.go git-subtree-dir: null git-subtree-mainline:75e2abdeacgit-subtree-split:109a79fb20
118 lines
2.4 KiB
Go
118 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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// Float64 is a nullable float64.
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type Float64 struct {
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Float64 float64
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Valid bool
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}
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// NewFloat64 creates a new Float64
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func NewFloat64(f float64, valid bool) Float64 {
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return Float64{
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Float64: f,
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Valid: valid,
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}
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}
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// Float64From creates a new Float64 that will always be valid.
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func Float64From(f float64) Float64 {
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return NewFloat64(f, true)
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}
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// Float64FromPtr creates a new Float64 that be null if f is nil.
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func Float64FromPtr(f *float64) Float64 {
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if f == nil {
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return NewFloat64(0, false)
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}
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return NewFloat64(*f, true)
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}
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// UnmarshalJSON implements json.Unmarshaler.
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func (f *Float64) UnmarshalJSON(data []byte) error {
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if bytes.Equal(data, NullBytes) {
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f.Float64 = 0
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f.Valid = false
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return nil
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}
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if err := json.Unmarshal(data, &f.Float64); err != nil {
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return err
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}
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f.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 (f *Float64) UnmarshalText(text []byte) error {
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if text == nil || len(text) == 0 {
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f.Valid = false
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return nil
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}
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var err error
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f.Float64, err = strconv.ParseFloat(string(text), 64)
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f.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 (f Float64) MarshalJSON() ([]byte, error) {
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if !f.Valid {
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return NullBytes, nil
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}
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return []byte(strconv.FormatFloat(f.Float64, 'f', -1, 64)), nil
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}
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// MarshalText implements encoding.TextMarshaler.
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func (f Float64) MarshalText() ([]byte, error) {
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if !f.Valid {
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return []byte{}, nil
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}
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return []byte(strconv.FormatFloat(f.Float64, 'f', -1, 64)), nil
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}
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// SetValid changes this Float64's value and also sets it to be non-null.
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func (f *Float64) SetValid(n float64) {
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f.Float64 = n
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f.Valid = true
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}
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// Ptr returns a pointer to this Float64's value, or a nil pointer if this Float64 is null.
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func (f Float64) Ptr() *float64 {
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if !f.Valid {
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return nil
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}
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return &f.Float64
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}
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// IsNull returns true for invalid Float64s, for future omitempty support (Go 1.4?)
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func (f Float64) IsNull() bool {
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return !f.Valid
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}
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// Scan implements the Scanner interface.
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func (f *Float64) Scan(value interface{}) error {
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if value == nil {
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f.Float64, f.Valid = 0, false
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return nil
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}
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f.Valid = true
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return convert.ConvertAssign(&f.Float64, value)
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}
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// Value implements the driver Valuer interface.
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func (f Float64) Value() (driver.Value, error) {
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if !f.Valid {
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return nil, nil
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}
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return f.Float64, nil
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}
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