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alist/utils/common.go
2021-03-04 23:50:51 +08:00

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package utils
import (
"errors"
"fmt"
"reflect"
)
// copy interface val
func SimpleCopyProperties(dst, src interface{}) (err error) {
// 防止意外panic
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("%v", e)
}
}()
dstType, dstValue := reflect.TypeOf(dst), reflect.ValueOf(dst)
srcType, srcValue := reflect.TypeOf(src), reflect.ValueOf(src)
// dst必须结构体指针类型
if dstType.Kind() != reflect.Ptr || dstType.Elem().Kind() != reflect.Struct {
return errors.New("dst type should be a struct pointer")
}
// src必须为结构体或者结构体指针.Elem()类似于*ptr的操作返回指针指向的地址反射类型
if srcType.Kind() == reflect.Ptr {
srcType, srcValue = srcType.Elem(), srcValue.Elem()
}
if srcType.Kind() != reflect.Struct {
return errors.New("src type should be a struct or a struct pointer")
}
// 取具体内容
dstType, dstValue = dstType.Elem(), dstValue.Elem()
// 属性个数
propertyNums := dstType.NumField()
for i := 0; i < propertyNums; i++ {
// 属性
property := dstType.Field(i)
// 待填充属性值
propertyValue := srcValue.FieldByName(property.Name)
// 无效说明src没有这个属性 || 属性同名但类型不同
if !propertyValue.IsValid() || property.Type != propertyValue.Type() {
continue
}
if dstValue.Field(i).CanSet() {
dstValue.Field(i).Set(propertyValue)
}
}
return nil
}