Swing/TextAreaOutputStream のバックアップ(No.1)

class TextAreaOutputStream extends OutputStream {
  private final ByteArrayOutputStream buf = new ByteArrayOutputStream();
  private final JTextArea textArea;
  public TextAreaOutputStream(JTextArea textArea) {
    super();
    this.textArea = textArea;
  }
  @Override public void flush() throws IOException {
    super.flush();
    buf.flush();
  }
  @Override public void close() throws IOException {
    super.close();
    buf.close();
  }
  @Override public void write(int b) throws IOException {
    if (b == '\r') {
      return;
    }
    if (b == '\n') {
      final String text = buf.toString("UTF-8");
      buf.reset();
      EventQueue.invokeLater(new Runnable() {
        @Override public void run() {
          textArea.append(text + '\n');
          textArea.setCaretPosition(textArea.getDocument().getLength());
        }
      });
      return;
    }
    buf.write(b);
  }
}