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map_struct.go
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/
map_struct.go
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package gsf
import (
"errors"
"fmt"
"reflect"
"strings"
)
func MapStruct(m map[string]interface{}, dst interface{}) error {
return MapToStruct(m, dst)
}
func MapToStruct(m map[string]interface{}, dst interface{}) error {
for k, v := range m {
err := setField(v, dst, k)
if err != nil {
return err
}
}
return nil
}
func setField(src interface{}, dest interface{}, name string) error {
v := reflect.ValueOf(dest).Elem()
fv := v.FieldByName(name)
if !fv.IsValid() {
for i := 0; i < v.NumField(); i++ {
f := v.Type().Field(i)
if strings.EqualFold(strings.ToLower(name), strings.ToLower(f.Tag.Get("json"))) {
return setField(src, dest, f.Name)
}
}
return fmt.Errorf("gsf: No such field: %s in obj", name)
}
if !fv.CanSet() {
return fmt.Errorf("gsf: Cannot set %s field value", name)
}
val := reflect.ValueOf(src)
if fv.Kind() != val.Kind() {
switch val.Kind() {
case reflect.Float32, reflect.Float64:
switch fv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
fv.SetInt(int64(val.Float()))
return nil
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
switch fv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
fv.SetInt(int64(val.Int()))
return nil
}
}
return errors.New("gsf: Provided value type didn't match obj field type")
} else {
fv.Set(val)
}
return nil
}