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package types
import (
"bytes"
"database/sql"
"database/sql/driver"
"encoding"
"encoding/json"
"github.com/icinga/icingadb/internal"
"strconv"
)
// Float adds JSON support to sql.NullFloat64.
type Float struct {
sql.NullFloat64
}
// MarshalJSON implements the json.Marshaler interface.
// Supports JSON null.
func (f Float) MarshalJSON() ([]byte, error) {
var v interface{}
if f.Valid {
v = f.Float64
}
return internal.MarshalJSON(v)
}
// UnmarshalText implements the encoding.TextUnmarshaler interface.
func (f *Float) UnmarshalText(text []byte) error {
parsed, err := strconv.ParseFloat(string(text), 64)
if err != nil {
return internal.CantParseFloat64(err, string(text))
}
*f = Float{sql.NullFloat64{
Float64: parsed,
Valid: true,
}}
return nil
}
// UnmarshalJSON implements the json.Unmarshaler interface.
// Supports JSON null.
func (f *Float) 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, &f.Float64); err != nil {
return err
}
f.Valid = true
return nil
}
// Assert interface compliance.
var (
_ json.Marshaler = Float{}
_ encoding.TextUnmarshaler = (*Float)(nil)
_ json.Unmarshaler = (*Float)(nil)
_ driver.Valuer = Float{}
_ sql.Scanner = (*Float)(nil)
)
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