mirror of https://github.com/jackc/pgx.git
110 lines
2.1 KiB
Go
110 lines
2.1 KiB
Go
package pgtype
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import (
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"fmt"
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"io"
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"reflect"
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)
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type Text struct {
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String string
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Status Status
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}
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func (dst *Text) Set(src interface{}) error {
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switch value := src.(type) {
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case string:
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*dst = Text{String: value, Status: Present}
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case *string:
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if value == nil {
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*dst = Text{Status: Null}
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} else {
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*dst = Text{String: *value, Status: Present}
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}
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default:
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if originalSrc, ok := underlyingStringType(src); ok {
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return dst.Set(originalSrc)
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}
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return fmt.Errorf("cannot convert %v to Text", value)
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}
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return nil
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}
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func (dst *Text) Get() interface{} {
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switch dst.Status {
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case Present:
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return dst.String
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case Null:
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return nil
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default:
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return dst.Status
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}
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}
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func (src *Text) AssignTo(dst interface{}) error {
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switch v := dst.(type) {
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case *string:
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if src.Status != Present {
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return fmt.Errorf("cannot assign %v to %T", src, dst)
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}
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*v = src.String
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default:
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if v := reflect.ValueOf(dst); v.Kind() == reflect.Ptr {
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el := v.Elem()
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switch el.Kind() {
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// if dst is a pointer to pointer, strip the pointer and try again
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case reflect.Ptr:
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if src.Status == Null {
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el.Set(reflect.Zero(el.Type()))
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return nil
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}
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if el.IsNil() {
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// allocate destination
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el.Set(reflect.New(el.Type().Elem()))
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}
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return src.AssignTo(el.Interface())
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case reflect.String:
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if src.Status != Present {
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return fmt.Errorf("cannot assign %v to %T", src, dst)
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}
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el.SetString(src.String)
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return nil
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}
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}
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return fmt.Errorf("cannot decode %v into %T", src, dst)
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}
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return nil
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}
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func (dst *Text) DecodeText(src []byte) error {
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if src == nil {
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*dst = Text{Status: Null}
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return nil
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}
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*dst = Text{String: string(src), Status: Present}
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return nil
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}
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func (dst *Text) DecodeBinary(src []byte) error {
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return dst.DecodeText(src)
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}
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func (src Text) EncodeText(w io.Writer) (bool, error) {
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switch src.Status {
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case Null:
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return true, nil
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case Undefined:
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return false, errUndefined
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}
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_, err := io.WriteString(w, src.String)
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return false, err
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}
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func (src Text) EncodeBinary(w io.Writer) (bool, error) {
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return src.EncodeText(w)
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}
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