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entity.go
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entity.go
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package dsimport
import (
"bytes"
"encoding/json"
"errors"
"golang.org/x/net/context"
"google.golang.org/appengine/datastore"
)
type entity struct {
v map[string]Value
}
var ErrBadEntity = errors.New("Bad entity")
func (e *entity) UnmarshalJSON(data []byte) error {
// reset
e.v = make(map[string]Value, 1)
decoder := json.NewDecoder(bytes.NewBuffer(data))
// expect an opening object brace
token, err := decoder.Token()
if err != nil {
return err
}
switch t := token.(type) {
case json.Delim:
if t.String() != "{" {
return ErrBadEntity
}
default:
return ErrBadEntity
}
for decoder.More() {
var nextPropertyName string
var nextPropertyValue Value
token, err = decoder.Token()
if err != nil {
return err
}
// this is the property name
switch t := token.(type) {
case string:
nextPropertyName = t
default:
return ErrBadEntity
}
// this here is the property value
if err = decoder.Decode(&nextPropertyValue); err != nil {
return err
}
e.v[nextPropertyName] = nextPropertyValue
}
return nil
}
func (e *entity) FetchProperties(ctx context.Context, pl *[]datastore.Property) error {
for name, value := range e.v {
if err := value.FetchProperties(ctx, name, pl); err != nil {
return err
}
}
return nil
}