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package pgtype
import (
"database/sql/driver"
"encoding/binary"
"math"
"strconv"
"github.com/jackc/pgx/pgio"
"github.com/pkg/errors"
)
type Float8 struct {
Float float64
Status Status
}
func (dst *Float8) Set(src interface{}) error {
if src == nil {
*dst = Float8{Status: Null}
return nil
}
switch value := src.(type) {
case float32:
*dst = Float8{Float: float64(value), Status: Present}
case float64:
*dst = Float8{Float: value, Status: Present}
case int8:
*dst = Float8{Float: float64(value), Status: Present}
case uint8:
*dst = Float8{Float: float64(value), Status: Present}
case int16:
*dst = Float8{Float: float64(value), Status: Present}
case uint16:
*dst = Float8{Float: float64(value), Status: Present}
case int32:
*dst = Float8{Float: float64(value), Status: Present}
case uint32:
*dst = Float8{Float: float64(value), Status: Present}
case int64:
f64 := float64(value)
if int64(f64) == value {
*dst = Float8{Float: f64, Status: Present}
} else {
return errors.Errorf("%v cannot be exactly represented as float64", value)
}
case uint64:
f64 := float64(value)
if uint64(f64) == value {
*dst = Float8{Float: f64, Status: Present}
} else {
return errors.Errorf("%v cannot be exactly represented as float64", value)
}
case int:
f64 := float64(value)
if int(f64) == value {
*dst = Float8{Float: f64, Status: Present}
} else {
return errors.Errorf("%v cannot be exactly represented as float64", value)
}
case uint:
f64 := float64(value)
if uint(f64) == value {
*dst = Float8{Float: f64, Status: Present}
} else {
return errors.Errorf("%v cannot be exactly represented as float64", value)
}
case string:
num, err := strconv.ParseFloat(value, 64)
if err != nil {
return err
}
*dst = Float8{Float: float64(num), Status: Present}
default:
if originalSrc, ok := underlyingNumberType(src); ok {
return dst.Set(originalSrc)
}
return errors.Errorf("cannot convert %v to Float8", value)
}
return nil
}
func (dst *Float8) Get() interface{} {
switch dst.Status {
case Present:
return dst.Float
case Null:
return nil
default:
return dst.Status
}
}
func (src *Float8) AssignTo(dst interface{}) error {
return float64AssignTo(src.Float, src.Status, dst)
}
func (dst *Float8) DecodeText(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Float8{Status: Null}
return nil
}
n, err := strconv.ParseFloat(string(src), 64)
if err != nil {
return err
}
*dst = Float8{Float: n, Status: Present}
return nil
}
func (dst *Float8) DecodeBinary(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Float8{Status: Null}
return nil
}
if len(src) != 8 {
return errors.Errorf("invalid length for float4: %v", len(src))
}
n := int64(binary.BigEndian.Uint64(src))
*dst = Float8{Float: math.Float64frombits(uint64(n)), Status: Present}
return nil
}
func (src *Float8) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
buf = append(buf, strconv.FormatFloat(float64(src.Float), 'f', -1, 64)...)
return buf, nil
}
func (src *Float8) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
buf = pgio.AppendUint64(buf, math.Float64bits(src.Float))
return buf, nil
}
// Scan implements the database/sql Scanner interface.
func (dst *Float8) Scan(src interface{}) error {
if src == nil {
*dst = Float8{Status: Null}
return nil
}
switch src := src.(type) {
case float64:
*dst = Float8{Float: src, Status: Present}
return nil
case string:
return dst.DecodeText(nil, []byte(src))
case []byte:
srcCopy := make([]byte, len(src))
copy(srcCopy, src)
return dst.DecodeText(nil, srcCopy)
}
return errors.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src *Float8) Value() (driver.Value, error) {
switch src.Status {
case Present:
return src.Float, nil
case Null:
return nil, nil
default:
return nil, errUndefined
}
}
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