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Golang: reflect mthod from wrapped struct anonymously
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| package common | |
| import ( | |
| "encoding/xml" | |
| "fmt" | |
| "reflect" | |
| "regexp" | |
| "strconv" | |
| ) | |
| type XmlDecodeError struct { | |
| msg string | |
| } | |
| func (e *XmlDecodeError) Error() string { | |
| return e.msg | |
| } | |
| func newXmlDecodeError(msg string) error { | |
| e := new(XmlDecodeError) | |
| e.msg = msg | |
| return e | |
| } | |
| type _customXmlTypeInterface interface { | |
| decode(str string) error | |
| } | |
| type _customXmlType struct { | |
| } | |
| func (c *_customXmlType) invokeDecode(str string) error { | |
| decodeMethod := reflect.ValueOf(c).MethodByName("decode") | |
| fmt.Printf("%+v", reflect.ValueOf(c).NumMethod()) | |
| results := decodeMethod.Call([]reflect.Value{ | |
| reflect.ValueOf(str)}) | |
| err, _ := results[0].Interface().(error) | |
| return err | |
| } | |
| func (c *_customXmlType) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error { | |
| var v string | |
| d.DecodeElement(&v, &start) | |
| return c.invokeDecode(v) | |
| } | |
| func (c *_customXmlType) UnmarshalXMLAttr(attr xml.Attr) error { | |
| return c.invokeDecode(attr.Value) | |
| } | |
| type XmlFileMode struct { | |
| _customXmlType | |
| mode uint | |
| } | |
| var _FileModeRegex = regexp.MustCompile("0([0-7])([0-7])([0-7])") | |
| func (p *XmlFileMode) decode(value string) error { | |
| ss := _FileModeRegex.FindStringSubmatch(value) | |
| if len(ss) == 0 { | |
| return newXmlDecodeError("illegal file mode/permission: " + value) | |
| } | |
| var mode uint = 0 | |
| if n, err := strconv.Atoi(ss[1]); err != nil { | |
| return err | |
| } else { | |
| mode = uint(n) | |
| mode <<= 3 | |
| } | |
| if n, err := strconv.Atoi(ss[2]); err != nil { | |
| return err | |
| } else { | |
| mode += uint(n) | |
| mode <<= 3 | |
| } | |
| if n, err := strconv.Atoi(ss[3]); err != nil { | |
| return err | |
| } else { | |
| mode += uint(n) | |
| } | |
| p.mode = mode | |
| return nil | |
| } | |
| func (p *XmlFileMode) Value() uint { | |
| return p.mode | |
| } |
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| package common | |
| import ( | |
| "encoding/xml" | |
| "testing" | |
| ) | |
| func TestXmlFileModeDecode(t *testing.T) { | |
| result := new(struct { | |
| XMLName xml.Name `xml:"root"` | |
| FileMode XmlFileMode `xml:"mode,attr"` | |
| }) | |
| data := ` | |
| <root mode="0755"/> | |
| ` | |
| err := xml.Unmarshal([]byte(data), result) | |
| if err != nil { | |
| t.Error(err) | |
| return | |
| } | |
| if result.FileMode.Value() != 0755 { | |
| t.Error("unmatched decoded value:", result.FileMode.Value()) | |
| return | |
| } | |
| } |
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