Dart buffered StringSink

buffered_string_sink.dart

/// Buffered stream sink that uses a string buffer.
class BufferedStringSink implements StringSink {
  final buffer = new StringBuffer();
  final int bufferThreshold;
  final StringSink target;

  BufferedStringSink(this.target, {this.bufferThreshold: 10000});

  void flush() {
    target.write(buffer);
    buffer.clear();
  }

  void _check() {
    if (buffer.length > bufferThreshold) {
      flush();
    }
  }

  @override
  void write(obj) {
    buffer.write(obj);
    _check();
  }

  @override
  void writeAll(objects, [separator]) {
    buffer.writeAll(objects, separator);
    _check();
  }

  @override
  void writeCharCode(charCode) {
    buffer.writeCharCode(charCode);
    _check();
  }

  @override
  void writeln([obj]) {
    buffer.writeln(obj);
    _check();
  }
}