61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
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package encoding
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import (
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"sync"
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)
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// Encoder encodes the contents of v into a byte representation.
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// It's primarily used for encoding a map[string]interface{} into a file format.
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type Encoder interface {
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Encode(v map[string]interface{}) ([]byte, error)
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}
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const (
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// ErrEncoderNotFound is returned when there is no encoder registered for a format.
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ErrEncoderNotFound = encodingError("encoder not found for this format")
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// ErrEncoderFormatAlreadyRegistered is returned when an encoder is already registered for a format.
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ErrEncoderFormatAlreadyRegistered = encodingError("encoder already registered for this format")
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)
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// EncoderRegistry can choose an appropriate Encoder based on the provided format.
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type EncoderRegistry struct {
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encoders map[string]Encoder
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mu sync.RWMutex
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}
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// NewEncoderRegistry returns a new, initialized EncoderRegistry.
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func NewEncoderRegistry() *EncoderRegistry {
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return &EncoderRegistry{
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encoders: make(map[string]Encoder),
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}
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}
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// RegisterEncoder registers an Encoder for a format.
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// Registering a Encoder for an already existing format is not supported.
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func (e *EncoderRegistry) RegisterEncoder(format string, enc Encoder) error {
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e.mu.Lock()
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defer e.mu.Unlock()
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if _, ok := e.encoders[format]; ok {
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return ErrEncoderFormatAlreadyRegistered
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}
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e.encoders[format] = enc
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return nil
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}
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func (e *EncoderRegistry) Encode(format string, v map[string]interface{}) ([]byte, error) {
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e.mu.RLock()
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encoder, ok := e.encoders[format]
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e.mu.RUnlock()
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if !ok {
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return nil, ErrEncoderNotFound
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}
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return encoder.Encode(v)
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}
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