public String getNextLineGroup() {
StringBuffer sb = new StringBuffer();
String line;
while (true) {
try {
line = reader.readLine();
} catch (IOException e) {
throw new RuntimeException(e);
}
// System.out.println ("LineGroupIterator: got line: "+line);
if (line == null) {
break;
} else if (!line.isEmpty()) {
sb.append(line);
sb.append('\n');
break;
}
}
if (sb.length() == 0) return null;
else return sb.toString();
}
