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legendtkl/copyStructFields.go

Last active August 1, 2016 02:26
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  1. legendtkl revised this gist Aug 1, 2016. No changes.
  2. legendtkl created this gist Aug 1, 2016.
    35 changes: 35 additions & 0 deletions copyStructFields.go
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,35 @@
    func CopyStruct(src, dst interface{}) {
    sval := reflect.ValueOf(src).Elem()
    dval := reflect.ValueOf(dst).Elem()

    for i := 0; i < sval.NumField(); i++ {
    value := sval.Field(i)
    name := sval.Type().Field(i).Name

    dvalue := dval.FieldByName(name)
    if dvalue.IsValid() == false {
    continue
    }

    typ := sval.Type().Field(i).Type

    switch typ.Kind() {
    case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
    if dvalue.Int() == 0 {
    dvalue.SetInt(value.Int())
    }
    case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
    if dvalue.Uint() == 0 {
    dvalue.SetUint(value.Uint())
    }
    case reflect.Float32, reflect.Float64:
    if dvalue.Float()-0.0 < 0.01 {
    dvalue.SetFloat(value.Float())
    }
    case reflect.String:
    if dvalue.String() == "" {
    dvalue.SetString(value.String())
    }
    }
    }
    }