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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package graph
import (
"reflect"
"github.com/mitchellh/mapstructure"
"github.com/pkg/errors"
)
// ValueMap models a .valueMap() gremlin response.
type ValueMap []map[string]interface{}
// Decode decodes a value map into v.
func (m ValueMap) Decode(v interface{}) error {
rv := reflect.ValueOf(v)
if rv.Kind() != reflect.Ptr {
return errors.New("cannot unmarshal into a non pointer")
}
if rv.IsNil() {
return errors.New("cannot unmarshal into a nil pointer")
}
if rv.Elem().Kind() != reflect.Slice {
v = &[]interface{}{v}
}
return m.decode(v)
}
func (m ValueMap) decode(v interface{}) error {
cfg := mapstructure.DecoderConfig{
DecodeHook: func(f, t reflect.Kind, data interface{}) (interface{}, error) {
if f == reflect.Slice && t != reflect.Slice {
rv := reflect.ValueOf(data)
if rv.Len() == 1 {
data = rv.Index(0).Interface()
}
}
return data, nil
},
Result: v,
TagName: "json",
}
dec, err := mapstructure.NewDecoder(&cfg)
if err != nil {
return errors.Wrap(err, "creating structure decoder")
}
if err := dec.Decode(m); err != nil {
return errors.Wrap(err, "decoding value map")
}
return nil
}
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