public static List<List<Line>> splitMessageByBoundary(
final List<Line> message, final String boundary) throws BatchDeserializerException {
final List<List<Line>> messageParts = new LinkedList<List<Line>>();
List<Line> currentPart = new LinkedList<Line>();
boolean isEndReached = false;
final String quotedBoundary = Pattern.quote(boundary);
final Pattern boundaryDelimiterPattern = Pattern.compile("--" + quotedBoundary + "--\\s*");
final Pattern boundaryPattern = Pattern.compile("--" + quotedBoundary + "\\s*");
for (Line currentLine : message) {
if (boundaryDelimiterPattern.matcher(currentLine.toString()).matches()) {
removeEndingCRLFFromList(currentPart);
messageParts.add(currentPart);
isEndReached = true;
} else if (boundaryPattern.matcher(currentLine.toString()).matches()) {
removeEndingCRLFFromList(currentPart);
messageParts.add(currentPart);
currentPart = new LinkedList<Line>();
} else {
currentPart.add(currentLine);
}
if (isEndReached) {
break;
}
}
// Remove preamble
if (messageParts.size() > 0) {
messageParts.remove(0);
}
if (!isEndReached) {
final int lineNumber = (message.size() > 0) ? message.get(0).getLineNumber() : 0;
throw new BatchDeserializerException(
"Missing close boundary delimiter",
BatchDeserializerException.MessageKeys.MISSING_CLOSE_DELIMITER,
Integer.toString(lineNumber));
}
return messageParts;
}
