Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
150 lines (123 sloc) 2.92 KB
package pgtype
import (
"database/sql/driver"
"encoding/binary"
"fmt"
"math"
"strconv"
"strings"
"github.com/jackc/pgx/pgio"
"github.com/pkg/errors"
)
type Line struct {
A, B, C float64
Status Status
}
func (dst *Line) Set(src interface{}) error {
return errors.Errorf("cannot convert %v to Line", src)
}
func (dst *Line) Get() interface{} {
switch dst.Status {
case Present:
return dst
case Null:
return nil
default:
return dst.Status
}
}
func (src *Line) AssignTo(dst interface{}) error {
return errors.Errorf("cannot assign %v to %T", src, dst)
}
func (dst *Line) DecodeText(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Line{Status: Null}
return nil
}
if len(src) < 7 {
return errors.Errorf("invalid length for Line: %v", len(src))
}
parts := strings.SplitN(string(src[1:len(src)-1]), ",", 3)
if len(parts) < 3 {
return errors.Errorf("invalid format for line")
}
a, err := strconv.ParseFloat(parts[0], 64)
if err != nil {
return err
}
b, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return err
}
c, err := strconv.ParseFloat(parts[2], 64)
if err != nil {
return err
}
*dst = Line{A: a, B: b, C: c, Status: Present}
return nil
}
func (dst *Line) DecodeBinary(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Line{Status: Null}
return nil
}
if len(src) != 24 {
return errors.Errorf("invalid length for Line: %v", len(src))
}
a := binary.BigEndian.Uint64(src)
b := binary.BigEndian.Uint64(src[8:])
c := binary.BigEndian.Uint64(src[16:])
*dst = Line{
A: math.Float64frombits(a),
B: math.Float64frombits(b),
C: math.Float64frombits(c),
Status: Present,
}
return nil
}
func (src *Line) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
buf = append(buf, fmt.Sprintf(`{%s,%s,%s}`,
strconv.FormatFloat(src.A, 'f', -1, 64),
strconv.FormatFloat(src.B, 'f', -1, 64),
strconv.FormatFloat(src.C, 'f', -1, 64),
)...)
return buf, nil
}
func (src *Line) 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.A))
buf = pgio.AppendUint64(buf, math.Float64bits(src.B))
buf = pgio.AppendUint64(buf, math.Float64bits(src.C))
return buf, nil
}
// Scan implements the database/sql Scanner interface.
func (dst *Line) Scan(src interface{}) error {
if src == nil {
*dst = Line{Status: Null}
return nil
}
switch src := src.(type) {
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 *Line) Value() (driver.Value, error) {
return EncodeValueText(src)
}
You can’t perform that action at this time.