public static String format()

in src/main/java/org/apache/log4j/component/helpers/MessageFormatter.java [111:153]
35 lines of code
7 McCabe index (conditional complexity)

    public static String format(final String messagePattern,
                                final Object arg1,
                                final Object arg2) {
        int i = 0;
        int len = messagePattern.length();

        StringBuffer sbuf = new StringBuffer(messagePattern.length() + 50);

        for (int l = 0; l < 2; l++) {
            int j = messagePattern.indexOf(DELIM_START, i);

            if (j == -1 || (j + 1 == len)) {
                // no more variables
                if (i == 0) { // this is a simple string
                    return messagePattern;
                } else {
                    // add the tail string which contains no variables
                    // and return the result.
                    sbuf.append(messagePattern.substring(i,
                                    messagePattern.length()));
                    return sbuf.toString();
                }
            } else {
                char delimStop = messagePattern.charAt(j + 1);
                if ((delimStop != DELIM_STOP)) {
                    // invalid DELIM_START/DELIM_STOP pair
                    sbuf.append(messagePattern.substring(i,
                            messagePattern.length()));
                    return sbuf.toString();
                }
                sbuf.append(messagePattern.substring(i, j));
                if (l == 0) {
                    sbuf.append(arg1);
                } else {
                    sbuf.append(arg2);
                }
                i = j + 2;
            }
        }
        // append the characters following the second {} pair.
        sbuf.append(messagePattern.substring(i, messagePattern.length()));
        return sbuf.toString();
    }