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encoder.go
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/
encoder.go
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package codec
import (
"bytes"
"database/sql"
"encoding/base64"
"encoding/json"
"fmt"
"reflect"
"strconv"
"strings"
"time"
"github.com/paulmach/orb"
"github.com/paulmach/orb/encoding/wkt"
"github.com/si3nloong/sqlike/reflext"
"github.com/si3nloong/sqlike/spatial"
"github.com/si3nloong/sqlike/jsonb"
)
// DefaultEncoders :
type DefaultEncoders struct {
codec *Registry
}
// EncodeByte :
func (enc DefaultEncoders) EncodeByte(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
b := v.Bytes()
if b == nil {
return make([]byte, 0), nil
}
x := base64.StdEncoding.EncodeToString(b)
return []byte(x), nil
}
// EncodeRawBytes :
func (enc DefaultEncoders) EncodeRawBytes(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
return sql.RawBytes(v.Bytes()), nil
}
// EncodeJSONRaw :
func (enc DefaultEncoders) EncodeJSONRaw(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
if v.IsNil() {
return []byte("null"), nil
}
buf := new(bytes.Buffer)
if err := json.Compact(buf, v.Bytes()); err != nil {
return nil, err
}
if buf.Len() == 0 {
return []byte(`{}`), nil
}
return json.RawMessage(buf.Bytes()), nil
}
// EncodeStringer :
func (enc DefaultEncoders) EncodeStringer(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
x := v.Interface().(fmt.Stringer)
return x.String(), nil
}
// EncodePointerStringer :
func (enc DefaultEncoders) EncodePointerStringer(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
x := v.Addr().Interface().(fmt.Stringer)
return x.String(), nil
}
// EncodeDateTime :
func (enc DefaultEncoders) EncodeDateTime(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
x := v.Interface().(time.Time)
// if x.IsZero() {
// x, _ = time.Parse(time.RFC3339, "1970-01-01T08:00:00Z")
// return x, nil
// }
// convert to UTC before storing into DB
return x.UTC(), nil
}
// EncodeSpatial :
func (enc DefaultEncoders) EncodeSpatial(st spatial.Type) ValueEncoder {
return func(sf reflext.StructFielder, v reflect.Value) (interface{}, error) {
if reflext.IsZero(v) {
return nil, nil
}
x := v.Interface().(orb.Geometry)
var srid uint
if sf != nil {
tag, ok := sf.Tag().LookUp("srid")
if ok {
integer, _ := strconv.Atoi(tag)
if integer > 0 {
srid = uint(integer)
}
}
}
return spatial.Geometry{
Type: st,
SRID: srid,
WKT: wkt.MarshalString(x),
}, nil
}
}
// EncodeString :
func (enc DefaultEncoders) EncodeString(sf reflext.StructFielder, v reflect.Value) (interface{}, error) {
str := v.String()
if str == "" && sf != nil {
tag := sf.Tag()
if val, ok := tag.LookUp("enum"); ok {
enums := strings.Split(val, "|")
if len(enums) > 0 {
return enums[0], nil
}
}
}
return str, nil
}
// EncodeBool :
func (enc DefaultEncoders) EncodeBool(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
return v.Bool(), nil
}
// EncodeInt :
func (enc DefaultEncoders) EncodeInt(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
return v.Int(), nil
}
// EncodeUint :
func (enc DefaultEncoders) EncodeUint(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
return v.Uint(), nil
}
// EncodeFloat :
func (enc DefaultEncoders) EncodeFloat(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
return v.Float(), nil
}
// EncodePtr :
func (enc *DefaultEncoders) EncodePtr(sf reflext.StructFielder, v reflect.Value) (interface{}, error) {
if !v.IsValid() || v.IsNil() {
return nil, nil
}
v = v.Elem()
encoder, err := enc.codec.LookupEncoder(v)
if err != nil {
return nil, err
}
return encoder(sf, v)
}
// EncodeStruct :
func (enc DefaultEncoders) EncodeStruct(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
return jsonb.Marshal(v)
}
// EncodeArray :
func (enc DefaultEncoders) EncodeArray(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
return jsonb.Marshal(v)
}
// EncodeMap :
func (enc DefaultEncoders) EncodeMap(_ reflext.StructFielder, v reflect.Value) (interface{}, error) {
if v.IsNil() {
return string("null"), nil
}
// t := v.Type()
// k := t.Key()
// if k.Kind() != reflect.String {
// return nil, fmt.Errorf("codec: unsupported data type %q for map key, it must be string", k.Kind())
// }
// k = t.Elem()
// if !isBaseType(k) {
// return nil, fmt.Errorf("codec: unsupported data type %q for map value", k.Kind())
// }
return jsonb.Marshal(v)
}
// func isBaseType(t reflect.Type) bool {
// for {
// k := t.Kind()
// switch k {
// case reflect.String:
// return true
// case reflect.Bool:
// return true
// case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
// return true
// case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
// return true
// case reflect.Float32, reflect.Float64:
// return true
// case reflect.Ptr:
// t = t.Elem()
// default:
// return false
// }
// }
// }