go-opt/optional_unmarshaljson.go

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package opt
import (
"encoding/json"
"sourcecode.social/reiver/go-erorr"
)
const errNilReceiver = erorr.Error("opt: nil receiver")
var _ json.Unmarshaler = new(Optional[bool])
var _ json.Unmarshaler = new(Optional[string])
// UnmarshalJSON makes it so json.Unmarshaler is implemented.
func (receiver *Optional[T]) UnmarshalJSON(data []byte) error {
if nil == receiver {
return errNilReceiver
}
switch interface{}(&receiver.value).(type) {
case *bool, *string, json.Unmarshaler:
// these are OK.
default:
return erorr.Errorf("opt: cannot unmarshal into something of type %T from JSON because pointer to parameterized type is %T rather than *bool, *string, or json.Unmarshaler", receiver, &receiver.value)
}
{
var dst T
err := json.Unmarshal(data, &dst)
if nil != err {
return err
}
*receiver = Something(dst)
}
return nil
}