private static double parseElapsedTimeAsDouble()

in utils/common/src/main/java/org/apache/brooklyn/util/time/Time.java [559:646]
83 lines of code
49 McCabe index (conditional complexity)

    private static double parseElapsedTimeAsDouble(final String timeStringOrig, String timeString, boolean allowNonUnit, boolean allowNegative) {
        if (timeString==null)
            throw new NullPointerException("GeneralHelper.parseTimeString cannot parse a null string");
        try {
            if (allowNonUnit) {
                if (timeString.trim().matches(".*[A-Za-z]$")) {
                    // disable parsing eg 1d as a double
                } else {
                    double d = Double.parseDouble(timeString);
                    return d;
                }
            }
        } catch (NumberFormatException e) {
            log.trace("Unable to parse '%s' as pure number. Trying smart parse.", timeStringOrig, e);
        }
        boolean isNegative = false;
        String multipleUnitsDisallowedBecause = null;
        try {
            //look for a type marker
            timeString = timeString.trim();
            int i=0;
            if (timeString.startsWith("-")) {
                if (allowNegative) {
                    isNegative = true;
                } else {
                    throw new NumberFormatException("Negation is not permitted on an individual time unit in a duration");
                }
                timeString = timeString.substring(1);
                if (!timeString.startsWith(" ")) {
                    multipleUnitsDisallowedBecause = "Negation must have a space after it to apply to mulitple units";
                } else while (timeString.startsWith(" ")) {
                    timeString = timeString.substring(1);
                }
            }
            while (i < timeString.length()) {
                char c = timeString.charAt(i);
                if (c=='.' || Character.isDigit(c)) i++;
                else break;
            }
            String num = timeString.substring(0, i);
            timeString = timeString.substring(i).trim();
            long multiplier = 0;
            if (num.isEmpty()) {
                //must be never or something
                // TODO does 'never' work?
                if (allowNegative && !isNegative && (timeString.equalsIgnoreCase("never") || timeString.equalsIgnoreCase("off") || timeString.equalsIgnoreCase("false"))) {
                    return -1;
                }
                throw new NumberFormatException("Invalid duration string '"+timeStringOrig+"'");
            }
            String s = Strings.getFirstWord(timeString);
            timeString = timeString.substring(s.length()).trim();
            if (s.equalsIgnoreCase("ms") || s.equalsIgnoreCase("milli") || s.equalsIgnoreCase("millis")
                || s.equalsIgnoreCase("millisec") || s.equalsIgnoreCase("millisecs")
                || s.equalsIgnoreCase("millisecond") || s.equalsIgnoreCase("milliseconds"))
                multiplier = 1;
            else if (s.equalsIgnoreCase("s") || s.equalsIgnoreCase("sec") || s.equalsIgnoreCase("secs")
                || s.equalsIgnoreCase("second") || s.equalsIgnoreCase("seconds"))
                multiplier = 1000;
            else if (s.equalsIgnoreCase("m") || s.equalsIgnoreCase("min") || s.equalsIgnoreCase("mins")
                || s.equalsIgnoreCase("minute") || s.equalsIgnoreCase("minutes"))
                multiplier = 60*1000;
            else if (s.equalsIgnoreCase("h") || s.equalsIgnoreCase("hr") || s.equalsIgnoreCase("hrs")
                || s.equalsIgnoreCase("hour") || s.equalsIgnoreCase("hours"))
                multiplier = 60*60*1000;
            else if (s.equalsIgnoreCase("d") || s.equalsIgnoreCase("day") || s.equalsIgnoreCase("days"))
                multiplier = 24*60*60*1000;
            else
                throw new NumberFormatException("Unknown unit '"+s+"' in time string '"+timeStringOrig+"'");

            double d = Double.parseDouble(num);
            double dd = 0;
            if (timeString.length()>0) {
                if (multipleUnitsDisallowedBecause!=null) {
                    throw new NumberFormatException(multipleUnitsDisallowedBecause);
                }
                dd = parseElapsedTimeAsDouble(timeStringOrig, timeString, false, false);
                if (dd==-1) {
                    throw new NumberFormatException("Cannot combine '"+timeString+"' with '"+num+" "+s+"'");
                }
            }
            return (d*multiplier + dd) * (isNegative ? -1 : 1);
        } catch (Exception ex) {
            if (ex instanceof NumberFormatException) throw (NumberFormatException)ex;
            log.trace("Details of parse failure:", ex);
            throw new NumberFormatException("Cannot parse time string '"+timeStringOrig+"'");
        }
    }