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reflect.go
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reflect.go
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// Copyright 2018-2022 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package indexer
import (
"errors"
"fmt"
"path"
"reflect"
"strconv"
"strings"
"github.com/cs3org/reva/v2/pkg/storage/utils/indexer/option"
)
func getType(v interface{}) (reflect.Value, error) {
rv := reflect.ValueOf(v)
for rv.Kind() == reflect.Ptr || rv.Kind() == reflect.Interface {
rv = rv.Elem()
}
if !rv.IsValid() {
return reflect.Value{}, errors.New("failed to read value via reflection")
}
return rv, nil
}
func getTypeFQN(t interface{}) string {
typ, _ := getType(t)
typeName := path.Join(typ.Type().PkgPath(), typ.Type().Name())
typeName = strings.ReplaceAll(typeName, "/", ".")
return typeName
}
func valueOf(v interface{}, indexBy option.IndexBy) (string, error) {
switch idxBy := indexBy.(type) {
case option.IndexByField:
return valueOfField(v, string(idxBy))
case option.IndexByFunc:
return idxBy.Func(v)
default:
return "", fmt.Errorf("unknown indexBy type")
}
}
func valueOfField(v interface{}, field string) (string, error) {
parts := strings.Split(field, ".")
for i, part := range parts {
r := reflect.ValueOf(v)
if r.Kind() == reflect.Ptr {
r = r.Elem()
}
f := reflect.Indirect(r).FieldByName(part)
if f.Kind() == reflect.Ptr {
f = f.Elem()
}
switch {
case f.Kind() == reflect.Struct && i != len(parts)-1:
v = f.Interface()
case f.Kind() == reflect.String:
return f.String(), nil
case f.IsZero():
return "", nil
default:
return strconv.Itoa(int(f.Int())), nil
}
}
return "", nil
}