private int processElement()

in guacamole-common/src/main/java/org/apache/guacamole/protocol/GuacamoleParser.java [266:371]
57 lines of code
15 McCabe index (conditional complexity)

    private int processElement(char chunk[], int offset, int length) throws GuacamoleException {

        int charsParsed = 0;

        // Do not exceed maximum number of elements
        if (elementCount == INSTRUCTION_MAX_ELEMENTS && state != State.COMPLETE) {
            state = State.ERROR;
            throw new GuacamoleServerException("Instruction contains too many elements.");
        }

        // Parse element length
        if (state == State.PARSING_LENGTH) {

            int parsedLength = elementLength;
            while (charsParsed < length) {

                // Pull next character
                char c = chunk[offset + charsParsed++];

                // If digit, add to length
                if (c >= '0' && c <= '9')
                    parsedLength = parsedLength*10 + c - '0';

                // If period, switch to parsing content
                else if (c == '.') {
                    state = State.PARSING_CONTENT;
                    break;
                }

                // If not digit, parse error
                else {
                    state = State.ERROR;
                    throw new GuacamoleServerException("Non-numeric character in element length.");
                }

            }

            // If too long, parse error
            if (parsedLength > INSTRUCTION_MAX_LENGTH) {
                state = State.ERROR;
                throw new GuacamoleServerException("Instruction exceeds maximum length.");
            }

            // Save length
            elementCodepoints = elementLength = parsedLength;

        } // end parse length

        // Parse element content, if available
        while (state == State.PARSING_CONTENT && charsParsed + elementLength + 1 <= length) {

            // Read element (which may not match element length if surrogate
            // characters are present)
            String element = new String(chunk, offset + charsParsed, elementLength);

            // Verify element contains the number of whole Unicode characters
            // expected, scheduling a future read if we don't yet have enough
            // characters
            int codepoints = element.codePointCount(0, element.length());
            if (codepoints < elementCodepoints) {
                elementLength += elementCodepoints - codepoints;
                continue;
            }

            // If the current element ends with a character involving both
            // a high and low surrogate, elementLength points to the low
            // surrogate and NOT the element terminator. We must correct the
            // length and reevaluate.
            else if (Character.isSurrogatePair(chunk[offset + charsParsed + elementLength - 1],
                    chunk[offset + charsParsed + elementLength])) {
                elementLength++;
                continue;
            }

            charsParsed += elementLength;
            elementLength = 0;

            // Add element to currently parsed elements
            elements[elementCount++] = element;

            // Read terminator char following element
            char terminator = chunk[offset + charsParsed++];
            switch (terminator) {

                // If semicolon, store end-of-instruction
                case ';':
                    state = State.COMPLETE;
                    break;

                // If comma, move on to next element
                case ',':
                    state = State.PARSING_LENGTH;
                    break;

                // Otherwise, parse error
                default:
                    state = State.ERROR;
                    throw new GuacamoleServerException("Element terminator of instruction was not ';' nor ','");

            }

        } // end parse content

        return charsParsed;

    }