public static String swapCase()

in src/main/java/org/apache/commons/text/WordUtils.java [457:486]

30 lines of code
7 McCabe index (conditional complexity)


    public static String swapCase(final String str) {
        if (StringUtils.isEmpty(str)) {
            return str;
        }
        final int strLen = str.length();
        final int[] newCodePoints = new int[strLen];
        int outOffset = 0;
        boolean whitespace = true;
        for (int index = 0; index < strLen;) {
            final int oldCodepoint = str.codePointAt(index);
            final int newCodePoint;
            if (Character.isUpperCase(oldCodepoint) || Character.isTitleCase(oldCodepoint)) {
                newCodePoint = Character.toLowerCase(oldCodepoint);
                whitespace = false;
            } else if (Character.isLowerCase(oldCodepoint)) {
                if (whitespace) {
                    newCodePoint = Character.toTitleCase(oldCodepoint);
                    whitespace = false;
                } else {
                    newCodePoint = Character.toUpperCase(oldCodepoint);
                }
            } else {
                whitespace = Character.isWhitespace(oldCodepoint);
                newCodePoint = oldCodepoint;
            }
            newCodePoints[outOffset++] = newCodePoint;
            index += Character.charCount(newCodePoint);
        }
        return new String(newCodePoints, 0, outOffset);
    }