protected void process()

in src/main/java/org/apache/log4j/varia/LogFilePatternReceiver.java [518:585]
55 lines of code
16 McCabe index (conditional complexity)

    protected void process(BufferedReader bufferedReader) throws IOException {
        Matcher eventMatcher;
        Matcher exceptionMatcher;
        String readLine;
        //if newlines are provided in the logFormat - (NL) - combine the lines prior to matching
        while ((readLine = bufferedReader.readLine()) != null) {
            StringBuilder line = new StringBuilder(readLine);
            //there is already one line (read above, start i at 1
            for (int i = 1; i < lineCount; i++) {
                String thisLine = bufferedReader.readLine();
                if (thisLine != null) {
                    line.append(newLine).append(thisLine);
                }
            }
            String input = line.toString();
            eventMatcher = regexpPattern.matcher(input);
            //skip empty line entries
            if (input.trim().equals("")) {
                continue;
            }
            exceptionMatcher = exceptionPattern.matcher(input);
            if (eventMatcher.matches()) {
                //build an event from the previous match (held in current map)
                ChainsawLoggingEvent event = buildEvent();
                if (event != null) {
                    if (passesExpression(event)) {
                        append(event);
                    }
                }
                currentMap.putAll(processEvent(eventMatcher.toMatchResult()));
            } else if (exceptionMatcher.matches()) {
                //an exception line
                additionalLines.add(input);
            } else {
                //neither...either post an event with the line or append as additional lines
                //if this was a logging event with multiple lines, each line will show up as its own event instead of being
                //appended as multiple lines on the same event..
                //choice is to have each non-matching line show up as its own line, or append them all to a previous event
                if (appendNonMatches) {
                    //hold on to the previous time, so we can do our best to preserve time-based ordering if the event is a non-match
                    String lastTime = (String) currentMap.get(TIMESTAMP);
                    //build an event from the previous match (held in current map)
                    if (currentMap.size() > 0) {
                        ChainsawLoggingEvent event = buildEvent();
                        if (event != null) {
                            if (passesExpression(event)) {
                                append(event);
                            }
                        }
                    }
                    if (lastTime != null) {
                        currentMap.put(TIMESTAMP, lastTime);
                    }
                    currentMap.put(MESSAGE, input);
                } else {
                    additionalLines.add(input);
                }
            }
        }

        //process last event if one exists
        ChainsawLoggingEvent event = buildEvent();
        if (event != null) {
            if (passesExpression(event)) {
                append(event);
            }
        }
    }