build method

@override LogSpan build()

Builds this span into another span, or returns itself if already terminal.

Override this for composable spans that build to other spans. Default implementation returns this.

Example:

class Timestamp extends LeafSpan {
  final DateTime date;
  Timestamp(this.date);

  @override
  LogSpan build() => PlainText('${date.hour}:${date.minute}');
}

Implementation

@override
LogSpan build() {
  final d = data;
  if (d == null || d.isEmpty) return EmptySpan();

  final children = <LogSpan>[];
  for (final entry in d.entries) {
    children.add(
      SpanSequence(
        children: [
          DataKey(entry.key),
          keyValueSeparatorBuilder(),
          DataValue(entry.value),
        ],
      ),
    );
  }

  return SpanSequence(
    children: children,
    separator: entrySeparatorBuilder(),
  );
}