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encode.go
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encode.go
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package mediatype
import (
"bytes"
"fmt"
"io"
)
var encoders = make(map[string]EncoderFunc)
// EncoderFunc is a function that creates an Encoder from an io.Writer.
type EncoderFunc func(w io.Writer) Encoder
// An Encoder will encode the given value to the Encoder's io.Writer.
type Encoder interface {
Encode(v interface{}) error
}
/*
AddEncoder installs an encoder for a given format.
AddEncoder("json", func(w io.Writer) Encoder { return json.NewEncoder(w) })
mt, err := Parse("application/json")
encoder, err := mt.Encoder(someWriter)
*/
func AddEncoder(format string, encfunc EncoderFunc) {
encoders[format] = encfunc
}
// Encoder finds an encoder based on this MediaType's Format field. An error is
// returned if an encoder cannot be found.
func (m *MediaType) Encoder(w io.Writer) (Encoder, error) {
if encfunc, ok := encoders[m.Format]; ok {
return encfunc(w), nil
}
return nil, fmt.Errorf("No encoder found for format %s (%s)", m.Format, m.String())
}
// Encode uses this MediaType's Encoder to encode the given value into a
// bytes.Buffer.
func (m *MediaType) Encode(v interface{}) (*bytes.Buffer, error) {
if v == nil {
return nil, fmt.Errorf("Nothing to encode")
}
buf := new(bytes.Buffer)
enc, err := m.Encoder(buf)
if err != nil {
return buf, err
}
return buf, enc.Encode(v)
}