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serialize.go
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/
serialize.go
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package bayesian
import (
"encoding/gob"
"fmt"
"io"
"os"
)
// NewClassifierFromFile loads an existing classifier from
// file. The classifier was previously saved with a call
// to c.WriteToFile(string).
func NewClassifierFromFile(name string) (c *Classifier, err error) {
file, err := os.Open(name)
if err != nil {
return nil, fmt.Errorf("failed to open %q: %w", name, err)
}
defer file.Close()
return NewClassifierFromReader(file)
}
// NewClassifierFromReader deserializes of a Gob encoded classifier.
func NewClassifierFromReader(r io.Reader) (c *Classifier, err error) {
dec := gob.NewDecoder(r)
w := new(Classifier)
err = dec.Decode(w)
if err != nil {
return nil, fmt.Errorf("failed to decode as Classifier: %w", err)
}
return w, nil
}
// WriteToFile serializes this classifier to a file.
func (c *Classifier) WriteToFile(name string) (err error) {
file, err := os.OpenFile(name, os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return fmt.Errorf("failed to open a file: %w", err)
}
defer file.Close()
return c.Write(file)
}
// WriteTo serializes this classifier to GOB and write to Writer.
func (c *Classifier) Write(w io.Writer) (err error) {
enc := gob.NewEncoder(w)
err = enc.Encode(c)
if err != nil {
return fmt.Errorf("failed to encode Classifier: %w", err)
}
return nil
}