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package libovsdb
import (
"encoding/json"
"errors"
"reflect"
)
// OvsSet is an OVSDB style set
// RFC 7047 has a wierd (but understandable) notation for set as described as :
// Either an <atom>, representing a set with exactly one element, or
// a 2-element JSON array that represents a database set value. The
// first element of the array must be the string "set", and the
// second element must be an array of zero or more <atom>s giving the
// values in the set. All of the <atom>s must have the same type.
type OvsSet struct {
GoSet []interface{}
}
// NewOvsSet creates a new OVSDB style set from a Go slice
func NewOvsSet(goSlice interface{}) (*OvsSet, error) {
v := reflect.ValueOf(goSlice)
if v.Kind() != reflect.Slice {
return nil, errors.New("OvsSet supports only Go Slice types")
}
var ovsSet []interface{}
for i := 0; i < v.Len(); i++ {
ovsSet = append(ovsSet, v.Index(i).Interface())
}
return &OvsSet{ovsSet}, nil
}
// MarshalJSON wil marshal an OVSDB style set in to a JSON byte array
func (o OvsSet) MarshalJSON() ([]byte, error) {
var oSet []interface{}
oSet = append(oSet, "set")
oSet = append(oSet, o.GoSet)
return json.Marshal(oSet)
}
// UnmarshalJSON will unmarshal a JSON byte array to an OVSDB style set
func (o *OvsSet) UnmarshalJSON(b []byte) (err error) {
var oSet []interface{}
if err = json.Unmarshal(b, &oSet); err == nil && len(oSet) > 1 {
innerSet := oSet[1].([]interface{})
for _, val := range innerSet {
goVal, err := ovsSliceToGoNotation(val)
if err == nil {
o.GoSet = append(o.GoSet, goVal)
}
}
}
return err
}
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