toOptionsJSON method
Implementation
@override
void toOptionsJSON(StringBuffer buffer) {
  super.toOptionsJSON(buffer);
  if (algorithm != null) {
    buffer.writeAll(['"algorithm":', jsonEncode(algorithm), ','], '');
  }
  if (enabled != null) {
    buffer.writeAll(['"enabled":', enabled, ','], '');
  }
  if (groupTimespan != null) {
    buffer.writeAll(['"groupTimespan":', groupTimespan, ','], '');
  }
  if (prop != null) {
    buffer.writeAll(['"prop":', jsonEncode(prop), ','], '');
  }
}