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package types
import (
"bytes"
"database/sql"
"database/sql/driver"
"encoding"
"encoding/json"
"github.com/icinga/icingadb/internal"
"strings"
)
// String adds JSON support to sql.NullString.
type String struct {
sql.NullString
}
// MarshalJSON implements the json.Marshaler interface.
// Supports JSON null.
func (s String) MarshalJSON() ([]byte, error) {
var v interface{}
if s.Valid {
v = s.String
}
return internal.MarshalJSON(v)
}
// UnmarshalText implements the encoding.TextUnmarshaler interface.
func (s *String) UnmarshalText(text []byte) error {
*s = String{sql.NullString{
String: string(text),
Valid: true,
}}
return nil
}
// UnmarshalJSON implements the json.Unmarshaler interface.
// Supports JSON null.
func (s *String) UnmarshalJSON(data []byte) error {
// Ignore null, like in the main JSON package.
if bytes.HasPrefix(data, []byte{'n'}) {
return nil
}
if err := internal.UnmarshalJSON(data, &s.String); err != nil {
return err
}
s.Valid = true
return nil
}
// Value implements the driver.Valuer interface.
// Supports SQL NULL.
func (s String) Value() (driver.Value, error) {
if !s.Valid {
return nil, nil
}
// PostgreSQL does not allow null bytes in varchar, char and text fields.
return strings.ReplaceAll(s.String, "\x00", ""), nil
}
// Assert interface compliance.
var (
_ json.Marshaler = String{}
_ encoding.TextUnmarshaler = (*String)(nil)
_ json.Unmarshaler = (*String)(nil)
_ driver.Valuer = String{}
_ sql.Scanner = (*String)(nil)
)
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