4f91fe41ce
* Add all additional float, int and uint types to zero package * Moved convert to its own package * Updated README to reflect changes
118 lines
2.9 KiB
Go
118 lines
2.9 KiB
Go
package zero
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import (
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"database/sql"
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"encoding/json"
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"fmt"
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"reflect"
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"strconv"
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)
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// Float64 is a nullable float64. Zero input will be considered null.
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// JSON marshals to zero if null.
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// Considered null to SQL if zero.
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type Float64 struct {
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sql.NullFloat64
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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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NullFloat64: sql.NullFloat64{
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Float64: f,
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Valid: valid,
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},
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}
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}
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// Float64From creates a new Float64 that will be null if zero.
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func Float64From(f float64) Float64 {
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return NewFloat64(f, f != 0)
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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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// It supports number and null input.
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// 0 will be considered a null Float64.
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// It also supports unmarshalling a sql.NullFloat64.
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func (f *Float64) UnmarshalJSON(data []byte) error {
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var err error
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var v interface{}
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if err = json.Unmarshal(data, &v); err != nil {
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return err
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}
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switch x := v.(type) {
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case float64:
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f.Float64 = x
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case map[string]interface{}:
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err = json.Unmarshal(data, &f.NullFloat64)
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case nil:
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f.Valid = false
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return nil
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default:
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err = fmt.Errorf("json: cannot unmarshal %v into Go value of type zero.Float64", reflect.TypeOf(v).Name())
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}
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f.Valid = (err == nil) && (f.Float64 != 0)
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return err
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}
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// UnmarshalText implements encoding.TextUnmarshaler.
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// It will unmarshal to a null Float64 if the input is a blank, zero, or not a float.
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// It will return an error if the input is not a float, blank, or "null".
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func (f *Float64) UnmarshalText(text []byte) error {
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str := string(text)
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if str == "" || str == "null" {
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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) && (f.Float64 != 0)
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return err
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}
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// MarshalJSON implements json.Marshaler.
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// It will encode null if this Float64 is null.
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func (f Float64) MarshalJSON() ([]byte, error) {
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n := f.Float64
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if !f.Valid {
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n = 0
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}
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return []byte(strconv.FormatFloat(n, 'f', -1, 64)), nil
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}
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// MarshalText implements encoding.TextMarshaler.
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// It will encode a zero if this Float64 is null.
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func (f Float64) MarshalText() ([]byte, error) {
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n := f.Float64
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if !f.Valid {
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n = 0
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}
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return []byte(strconv.FormatFloat(n, '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(v float64) {
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f.Float64 = v
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f.Valid = true
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}
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// Ptr returns a poFloater to this Float64's value, or a nil poFloater 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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// IsZero returns true for null or zero Float64's, for future omitempty support (Go 1.4?)
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func (f Float64) IsZero() bool {
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return !f.Valid || f.Float64 == 0
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}
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