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ReflectFieldInterface

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This commit is contained in:
DanB
2017-10-13 15:49:01 +02:00
parent eaf502e55a
commit d8ad002f3f
1 changed files with 25 additions and 14 deletions
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39
utils/reflect.go
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@@ -54,9 +54,9 @@ func CastFieldIfToString(fld interface{}) (string, bool) {
return strVal, converted
}
// ReflectFieldAsString parses intf and attepting to return the field as string or error otherwise
// ReflectFieldInterface parses intf attepting to return the field as string or error otherwise
// Supports "ExtraFields" where additional fields are dynamically inserted in map with field name: extraFieldsLabel
func ReflectFieldAsString(intf interface{}, fldName, extraFieldsLabel string) (string, error) {
func ReflectFieldInterface(intf interface{}, fldName, extraFieldsLabel string) (retIf interface{}, err error) {
v := reflect.ValueOf(intf)
if v.Kind() == reflect.Ptr {
v = v.Elem()
@@ -68,41 +68,52 @@ func ReflectFieldAsString(intf interface{}, fldName, extraFieldsLabel string) (s
case reflect.Map:
field = v.MapIndex(reflect.ValueOf(fldName))
if !field.IsValid() { // Not looking in extra fields anymore
return "", ErrNotFound
return nil, ErrNotFound
}
default:
return "", fmt.Errorf("Unsupported field kind: %v", v.Kind())
return nil, fmt.Errorf("Unsupported field kind: %v", v.Kind())
}
if !field.IsValid() {
if extraFieldsLabel == "" {
return "", ErrNotFound
return nil, ErrNotFound
}
mpVal := v.FieldByName(extraFieldsLabel)
if !mpVal.IsValid() || mpVal.Kind() != reflect.Map {
return "", ErrNotFound
return nil, ErrNotFound
}
field = mpVal.MapIndex(reflect.ValueOf(fldName))
if !field.IsValid() {
return "", ErrNotFound
return nil, ErrNotFound
}
}
switch field.Kind() {
return field.Interface(), nil
}
// ReflectFieldAsString parses intf and attepting to return the field as string or error otherwise
// Supports "ExtraFields" where additional fields are dynamically inserted in map with field name: extraFieldsLabel
func ReflectFieldAsString(intf interface{}, fldName, extraFieldsLabel string) (string, error) {
field, err := ReflectFieldInterface(intf, fldName, extraFieldsLabel)
if err != nil {
return "", err
}
vOf := reflect.ValueOf(field)
switch vOf.Kind() {
case reflect.String:
return field.String(), nil
return vOf.String(), nil
case reflect.Int, reflect.Int64:
return strconv.FormatInt(field.Int(), 10), nil
return strconv.FormatInt(vOf.Int(), 10), nil
case reflect.Float64:
return strconv.FormatFloat(field.Float(), 'f', -1, 64), nil
return strconv.FormatFloat(vOf.Float(), 'f', -1, 64), nil
case reflect.Interface:
strVal, converted := CastFieldIfToString(field.Interface())
strVal, converted := CastFieldIfToString(field)
if !converted {
return "", fmt.Errorf("Cannot convert to string field type: %s", field.Kind().String())
return "", fmt.Errorf("Cannot convert to string field type: %s", vOf.Kind().String())
} else {
return strVal, nil
}
default:
return "", fmt.Errorf("Cannot convert to string field type: %s", field.Kind().String())
return "", fmt.Errorf("Cannot convert to string field type: %s", vOf.Kind().String())
}
}