Set transitionOn()

in src/main/software/amazon/event/ruler/ByteMachine.java [88:123]
24 lines of code
7 McCabe index (conditional complexity)

    Set<NameStateWithPattern> transitionOn(final String valString) {

        // not thread-safe, but this is only used in the scope of this method on one thread
        final Set<NameStateWithPattern> transitionTo = new HashSet<>();

        // Do CIDR matching if there is at least one IP pattern, then move on to NUMERIC or STRING matching below.
        if (hasIP.get() > 0) {
            try {
                // we'll try both the quoted and unquoted version to help people whose events aren't in JSON
                String ipString;
                if (valString.startsWith("\"") && valString.endsWith("\"")) {
                    ipString = CIDR.ipToString(valString.substring(1, valString.length() -1));
                } else {
                    ipString = CIDR.ipToString(valString);
                }
                doTransitionOn(ipString, transitionTo, TransitionValueType.CIDR);
            } catch (IllegalArgumentException e) {
                // no-op, couldn't treat this as an IP address
            }
        }

        // Do just one of NUMERIC or STRING matching. Do NUMERIC if machine has numeric patterns and provided value
        // is a number. Otherwise, do STRING. We'll still get the correct behavior even if there are both numeric and
        // string patterns present as no value can satisfy both a numeric and a string pattern. This is due to string
        // patterns starting/ending with a double quotation, where as numeric patterns never do.
        if (hasNumeric.get() > 0) {
            try {
                doTransitionOn(ComparableNumber.generate(valString), transitionTo, TransitionValueType.NUMERIC);
                return transitionTo;
            } catch (Exception e) {
                // no-op, couldn't treat this as a sensible number
            }
        }
        doTransitionOn(valString, transitionTo, TransitionValueType.STRING);
        return transitionTo;
    }