forked from hidevopsio/hiboot
/
copier.go
173 lines (151 loc) · 4.3 KB
/
copier.go
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// Copyright 2018 John Deng (hi.devops.io@gmail.com).
//
// 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.
// Notes: this source code is originally copied from https://github.com/jinzhu/copier
package copier
import (
"database/sql"
"errors"
"github.com/hidevopsio/hiboot/pkg/utils/reflector"
"reflect"
)
func set(to, from reflect.Value) bool {
if from.IsValid() && to.IsValid() {
if to.Kind() == reflect.Ptr {
//set `to` to nil if from is nil
if from.Kind() == reflect.Ptr && from.IsNil() {
to.Set(reflect.Zero(to.Type()))
return true
} else if to.IsNil() {
to.Set(reflect.New(to.Type().Elem()))
}
to = to.Elem()
}
if from.Type().ConvertibleTo(to.Type()) {
to.Set(from.Convert(to.Type()))
} else if scanner, ok := to.Addr().Interface().(sql.Scanner); ok {
err := scanner.Scan(from.Interface())
if err != nil {
return false
}
} else if from.Kind() == reflect.Ptr {
return set(to, from.Elem())
} else {
return false
}
} else {
return false
}
return true
}
// Copy copy things
func Copy(toValue interface{}, fromValue interface{}) (err error) {
var (
isSlice bool
amount = 1
from = reflector.Indirect(reflect.ValueOf(fromValue))
to = reflector.Indirect(reflect.ValueOf(toValue))
)
if !to.CanAddr() {
return errors.New("copy to value is unaddressable")
}
// Return is from value is invalid
if !from.IsValid() {
return
}
// Just set it if possible to assign
if from.Type().AssignableTo(to.Type()) {
to.Set(from)
return
}
fromType := reflector.IndirectType(from.Type())
toType := reflector.IndirectType(to.Type())
if fromType.Kind() != reflect.Struct || toType.Kind() != reflect.Struct {
return
}
if to.Kind() == reflect.Slice {
isSlice = true
if from.Kind() == reflect.Slice {
amount = from.Len()
}
}
for i := 0; i < amount; i++ {
var dest, source reflect.Value
if isSlice {
// source
if from.Kind() == reflect.Slice {
source = reflector.Indirect(from.Index(i))
} else {
source = reflector.Indirect(from)
}
// dest
dest = reflector.Indirect(reflect.New(toType).Elem())
} else {
source = reflector.Indirect(from)
dest = reflector.Indirect(to)
}
// Copy from field to field or method
for _, field := range reflector.DeepFields(fromType) {
name := field.Name
if fromField := source.FieldByName(name); fromField.IsValid() {
// has field
if toField := dest.FieldByName(name); toField.IsValid() {
if toField.CanSet() {
if !set(toField, fromField) {
if err := Copy(toField.Addr().Interface(), fromField.Interface()); err != nil {
return err
}
}
}
} else {
// try to set to method
var toMethod reflect.Value
if dest.CanAddr() {
toMethod = dest.Addr().MethodByName(name)
} else {
toMethod = dest.MethodByName(name)
}
if toMethod.IsValid() && toMethod.Type().NumIn() == 1 && fromField.Type().AssignableTo(toMethod.Type().In(0)) {
toMethod.Call([]reflect.Value{fromField})
}
}
}
}
// Copy from method to field
for _, field := range reflector.DeepFields(toType) {
name := field.Name
var fromMethod reflect.Value
if source.CanAddr() {
fromMethod = source.Addr().MethodByName(name)
} else {
fromMethod = source.MethodByName(name)
}
if fromMethod.IsValid() && fromMethod.Type().NumIn() == 0 && fromMethod.Type().NumOut() == 1 {
if toField := dest.FieldByName(name); toField.IsValid() && toField.CanSet() {
values := fromMethod.Call([]reflect.Value{})
if len(values) >= 1 {
set(toField, values[0])
}
}
}
}
if isSlice {
if dest.Addr().Type().AssignableTo(to.Type().Elem()) {
to.Set(reflect.Append(to, dest.Addr()))
} else if dest.Type().AssignableTo(to.Type().Elem()) {
to.Set(reflect.Append(to, dest))
}
}
}
return
}