7
// Decoder decodes the contents of b into v.
8
// It's primarily used for decoding contents of a file into a map[string]interface{}.
9
type Decoder interface {
10
Decode(b []byte, v map[string]interface{}) error
14
// ErrDecoderNotFound is returned when there is no decoder registered for a format.
15
ErrDecoderNotFound = encodingError("decoder not found for this format")
17
// ErrDecoderFormatAlreadyRegistered is returned when an decoder is already registered for a format.
18
ErrDecoderFormatAlreadyRegistered = encodingError("decoder already registered for this format")
21
// DecoderRegistry can choose an appropriate Decoder based on the provided format.
22
type DecoderRegistry struct {
23
decoders map[string]Decoder
28
// NewDecoderRegistry returns a new, initialized DecoderRegistry.
29
func NewDecoderRegistry() *DecoderRegistry {
30
return &DecoderRegistry{
31
decoders: make(map[string]Decoder),
35
// RegisterDecoder registers a Decoder for a format.
36
// Registering a Decoder for an already existing format is not supported.
37
func (e *DecoderRegistry) RegisterDecoder(format string, enc Decoder) error {
41
if _, ok := e.decoders[format]; ok {
42
return ErrDecoderFormatAlreadyRegistered
45
e.decoders[format] = enc
50
// Decode calls the underlying Decoder based on the format.
51
func (e *DecoderRegistry) Decode(format string, b []byte, v map[string]interface{}) error {
53
decoder, ok := e.decoders[format]
57
return ErrDecoderNotFound
60
return decoder.Decode(b, v)