92 lines
2.1 KiB
Go
Vendored
92 lines
2.1 KiB
Go
Vendored
// Copyright (c) 2014 Couchbase, Inc.
|
|
//
|
|
// 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.
|
|
|
|
package mapping
|
|
|
|
import (
|
|
"reflect"
|
|
"strings"
|
|
)
|
|
|
|
func lookupPropertyPath(data interface{}, path string) interface{} {
|
|
pathParts := decodePath(path)
|
|
|
|
current := data
|
|
for _, part := range pathParts {
|
|
current = lookupPropertyPathPart(current, part)
|
|
if current == nil {
|
|
break
|
|
}
|
|
}
|
|
|
|
return current
|
|
}
|
|
|
|
func lookupPropertyPathPart(data interface{}, part string) interface{} {
|
|
val := reflect.ValueOf(data)
|
|
if !val.IsValid() {
|
|
return nil
|
|
}
|
|
typ := val.Type()
|
|
switch typ.Kind() {
|
|
case reflect.Map:
|
|
// FIXME can add support for other map keys in the future
|
|
if typ.Key().Kind() == reflect.String {
|
|
key := reflect.ValueOf(part)
|
|
entry := val.MapIndex(key)
|
|
if entry.IsValid() {
|
|
return entry.Interface()
|
|
}
|
|
}
|
|
case reflect.Struct:
|
|
field := val.FieldByName(part)
|
|
if field.IsValid() && field.CanInterface() {
|
|
return field.Interface()
|
|
}
|
|
case reflect.Ptr:
|
|
ptrElem := val.Elem()
|
|
if ptrElem.IsValid() && ptrElem.CanInterface() {
|
|
return lookupPropertyPathPart(ptrElem.Interface(), part)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
const pathSeparator = "."
|
|
|
|
func decodePath(path string) []string {
|
|
return strings.Split(path, pathSeparator)
|
|
}
|
|
|
|
func encodePath(pathElements []string) string {
|
|
return strings.Join(pathElements, pathSeparator)
|
|
}
|
|
|
|
func mustString(data interface{}) (string, bool) {
|
|
if data != nil {
|
|
str, ok := data.(string)
|
|
if ok {
|
|
return str, true
|
|
}
|
|
}
|
|
return "", false
|
|
}
|
|
|
|
// parseTagName extracts the field name from a struct tag
|
|
func parseTagName(tag string) string {
|
|
if idx := strings.Index(tag, ","); idx != -1 {
|
|
return tag[:idx]
|
|
}
|
|
return tag
|
|
}
|