private void doAddProtocolLines()

in mpt/core/src/main/java/org/apache/james/mpt/protocol/ProtocolSessionBuilder.java [179:237]
56 lines of code
15 McCabe index (conditional complexity)

    private void doAddProtocolLines(ProtocolInteractor session, String scriptName, BufferedReader reader) throws Exception {
        String line;
        int sessionNumber = -1;
        int lineNumber = -1;
        String lastClientMsg = "";
        while ((line = reader.readLine()) != null) {
            line = substituteVariables(line);
            String location = scriptName + ":" + lineNumber;
            if (line.startsWith("\\+")) {
                session.cont(sessionNumber);
            } else if (line.startsWith(CLIENT_TAG)) {
                String clientMsg = "";
                if (line.length() > 3) {
                    clientMsg = line.substring(3);
                }
                session.cl(sessionNumber, clientMsg);
                lastClientMsg = clientMsg;
            } else if (line.startsWith(SERVER_TAG)) {
                String serverMsg = "";
                if (line.length() > 3) {
                    serverMsg = line.substring(3);
                }
                session.sl(sessionNumber, serverMsg, location, lastClientMsg);
            } else if (line.startsWith(OPEN_UNORDERED_BLOCK_TAG)) {
                List<String> unorderedLines = new ArrayList<>(5);
                line = reader.readLine();

                while (!line.startsWith(CLOSE_UNORDERED_BLOCK_TAG)) {
                    if (!line.startsWith(SERVER_TAG)) {
                        throw new Exception(
                                "Only 'S: ' lines are permitted inside a 'SUB {' block.");
                    }
                    String serverMsg = line.substring(3);
                    unorderedLines.add(serverMsg);
                    line = reader.readLine();
                    lineNumber++;
                }

                session.sub(sessionNumber, unorderedLines, location,
                        lastClientMsg);
            } else if (line.startsWith(COMMENT_TAG)
                    || line.trim().length() == 0) {
                // ignore these lines.
            } else if (line.startsWith(SESSION_TAG)) {
                String number = line.substring(SESSION_TAG.length()).trim();
                if (number.length() == 0) {
                    throw new Exception("No session number specified");
                }
                sessionNumber = Integer.parseInt(number);
            } else {
                String prefix = line;
                if (line.length() > 3) {
                    prefix = line.substring(0, 3);
                }
                throw new Exception("Invalid line prefix: " + prefix);
            }
            lineNumber++;
        }
    }