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util-reflection-set.go
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util-reflection-set.go
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/*
* Copyright (c) 2022, Andy Pangaribuan <https://github.com/apangaribuan>.
* All Rights Reserved.
*/
package util
import (
"errors"
"fmt"
"reflect"
"unicode"
"unsafe"
"github.com/andypangaribuan/project9/f9"
)
func (slf *srUtil) ReflectionSet(obj interface{}, bind map[string]interface{}) error {
objVal := reflect.ValueOf(obj)
if objVal.Kind() != reflect.Ptr {
return errors.New("obj must be a pointer")
}
objVal = objVal.Elem()
objType := objVal.Type()
for i := 0; i < objType.NumField(); i++ {
rs := objType.Field(i)
rf := objVal.Field(i)
fieldName := rs.Name
if bindValue, ok := bind[fieldName]; ok {
if !rf.IsValid() {
return fmt.Errorf("invalid field: %v", fieldName)
}
err := slf.reflectionSet(rs, rf, bindValue)
if err != nil {
return err
}
}
}
return nil
}
func (slf *srUtil) reflectionSet(sf reflect.StructField, rv reflect.Value, obj interface{}) (err error) {
switch rv.CanSet() {
case true:
err = slf.reflectionPublicSet(sf, rv, obj)
case false:
err = slf.reflectionPrivateSet(sf, rv, obj)
}
return
}
func (slf *srUtil) reflectionPublicSet(rs reflect.StructField, rv reflect.Value, obj interface{}) error {
err := f9.PanicCatcher(func() {
rv.Set(reflect.ValueOf(obj))
})
return slf.reflectionSetError(rs.Name, err)
}
func (slf *srUtil) reflectionPrivateSet(rs reflect.StructField, rv reflect.Value, obj interface{}) error {
var first rune
for _, c := range rs.Name {
first = c
break
}
if unicode.IsUpper(first) {
return errors.New(fmt.Sprintf("cannot set the field: %v", rs.Name))
}
ptr := unsafe.Pointer(rv.UnsafeAddr())
newRV := reflect.NewAt(rv.Type(), ptr)
val := newRV.Elem()
err := f9.PanicCatcher(func() {
val.Set(reflect.ValueOf(obj))
})
return slf.reflectionSetError(rs.Name, err)
}
func (*srUtil) reflectionSetError(fieldName string, err error) error {
if err != nil {
return errors.New(fmt.Sprintf("%v\nfield name: %v", err, fieldName))
}
return err
}