// valueToProto converts a named value to a newly allocated Property.
// The returned error string is empty on success.
func valueToProto(defaultAppID, name string, v reflect.Value, multiple bool) (p *pb.Property, errStr string) {
var (
pv pb.PropertyValue
unsupported bool
)
switch v.Kind() {
case reflect.Invalid:
// No-op.
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
pv.Int64Value = proto.Int64(v.Int())
case reflect.Bool:
pv.BooleanValue = proto.Bool(v.Bool())
case reflect.String:
pv.StringValue = proto.String(v.String())
case reflect.Float32, reflect.Float64:
pv.DoubleValue = proto.Float64(v.Float())
case reflect.Ptr:
if k, ok := v.Interface().(*Key); ok {
if k != nil {
pv.Referencevalue = keyToReferenceValue(defaultAppID, k)
}
} else {
unsupported = true
}
case reflect.Struct:
switch t := v.Interface().(type) {
case time.Time:
if t.Before(minTime) || t.After(maxTime) {
return nil, "time value out of range"
}
pv.Int64Value = proto.Int64(toUnixMicro(t))
case appengine.GeoPoint:
if !t.Valid() {
return nil, "invalid GeoPoint value"
}
// NOTE: Strangely, latitude maps to X, longitude to Y.
pv.Pointvalue = &pb.PropertyValue_PointValue{X: &t.Lat, Y: &t.Lng}
default:
unsupported = true
}
case reflect.Slice:
if b, ok := v.Interface().([]byte); ok {
pv.StringValue = proto.String(string(b))
} else {
// nvToProto should already catch slice values.
// If we get here, we have a slice of slice values.
unsupported = true
}
default:
unsupported = true
}
if unsupported {
return nil, "unsupported datastore value type: " + v.Type().String()
}
p = &pb.Property{
Name: proto.String(name),
Value: &pv,
Multiple: proto.Bool(multiple),
}
if v.IsValid() {
switch v.Interface().(type) {
case []byte:
p.Meaning = pb.Property_BLOB.Enum()
case ByteString:
p.Meaning = pb.Property_BYTESTRING.Enum()
case appengine.BlobKey:
p.Meaning = pb.Property_BLOBKEY.Enum()
case time.Time:
p.Meaning = pb.Property_GD_WHEN.Enum()
case appengine.GeoPoint:
p.Meaning = pb.Property_GEORSS_POINT.Enum()
}
}
return p, ""
}
