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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| package reflection | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "reflect" | ||
| ) | ||
|
|
||
| func GetField(obj interface{}, name string) (interface{}, error) { | ||
| if !hasValidType(obj, []reflect.Kind{reflect.Struct, reflect.Ptr}) { | ||
| return nil, errors.New("Cannot use GetField on a non-struct interface") | ||
| } | ||
|
|
||
| objValue := reflectValue(obj) | ||
| field := objValue.FieldByName(name) | ||
| if !field.IsValid() { | ||
| return nil, fmt.Errorf("No such field: %s in obj", name) | ||
| } | ||
|
|
||
| return field.Interface(), nil | ||
| } | ||
|
|
||
| func hasValidType(obj interface{}, types []reflect.Kind) bool { | ||
| for _, t := range types { | ||
| if reflect.TypeOf(obj).Kind() == t { | ||
| return true | ||
| } | ||
| } | ||
|
|
||
| return false | ||
| } | ||
|
|
||
| func reflectValue(obj interface{}) reflect.Value { | ||
| var val reflect.Value | ||
|
|
||
| if reflect.TypeOf(obj).Kind() == reflect.Ptr { | ||
| val = reflect.ValueOf(obj).Elem() | ||
| } else { | ||
| val = reflect.ValueOf(obj) | ||
| } | ||
|
|
||
| return val | ||
| } |
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