protected void process()

in src/main/java/org/apache/log4j/receivers/varia/LogFilePatternReceiver.java [479:534]
45 lines of code
14 McCabe index (conditional complexity)

  protected void process(BufferedReader bufferedReader) throws IOException {
        Matcher eventMatcher;
        Matcher exceptionMatcher;
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            //skip empty line entries
            eventMatcher = regexpPattern.matcher(line);
            if (line.trim().equals("")) {continue;}
            exceptionMatcher = exceptionPattern.matcher(line);
            if (eventMatcher.matches()) {
                //build an event from the previous match (held in current map)
                LoggingEvent event = buildEvent();
                if (event != null) {
                    if (passesExpression(event)) {
                        doPost(event);
                    }
                }
                currentMap.putAll(processEvent(eventMatcher.toMatchResult()));
            } else if (exceptionMatcher.matches()) {
                //an exception line
                additionalLines.add(line);
            } 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) {
                        LoggingEvent event = buildEvent();
                        if (event != null) {
                            if (passesExpression(event)) {
                              doPost(event);
                            }
                        }
                    }
                    if (lastTime != null) {
                        currentMap.put(TIMESTAMP, lastTime);
                    }
                    currentMap.put(MESSAGE, line);
                } else {
                    additionalLines.add(line);
                }
            }
        }

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