private void read()

in oak-core/src/main/java/org/apache/jackrabbit/oak/query/xpath/XPathToSQL2Converter.java [1026:1142]
113 lines of code
29 McCabe index (conditional complexity)

    private void read() throws ParseException {
        currentTokenQuoted = false;
        if (expected != null) {
            expected.clear();
        }
        int[] types = characterTypes;
        int i = parseIndex;
        int type = types[i];
        while (type == 0) {
            type = types[++i];
        }
        int start = i;
        char[] chars = statementChars;
        char c = chars[i++];
        currentToken = "";
        switch (type) {
        case CHAR_NAME:
            while (true) {
                type = types[i];
                // the '-' can be part of a name,
                // for example in "fn:lower-case"
                // the '.' can be part of a name,
                // for example in "@offloading.status"
                if (type != CHAR_NAME && type != CHAR_VALUE
                        && chars[i] != '-'
                        && chars[i] != '.') {
                    break;
                }
                i++;
            }
            currentToken = statement.substring(start, i);
            if (currentToken.isEmpty()) {
                throw getSyntaxError();
            }
            currentTokenType = IDENTIFIER;
            parseIndex = i;
            return;
        case CHAR_SPECIAL_2:
            if (types[i] == CHAR_SPECIAL_2) {
                i++;
            }
            currentToken = statement.substring(start, i);
            currentTokenType = KEYWORD;
            parseIndex = i;
            break;
        case CHAR_SPECIAL_1:
            currentToken = statement.substring(start, i);
            switch (c) {
            case '+':
                currentTokenType = PLUS;
                break;
            case '-':
                currentTokenType = MINUS;
                break;
            case '(':
                currentTokenType = OPEN;
                break;
            case ')':
                currentTokenType = CLOSE;
                break;
            default:
                currentTokenType = KEYWORD;
            }
            parseIndex = i;
            return;
        case CHAR_VALUE:
            long number = c - '0';
            while (true) {
                c = chars[i];
                if (c < '0' || c > '9') {
                    if (c == '.') {
                        readDecimal(start, i);
                        break;
                    }
                    if (c == 'E' || c == 'e') {
                        readDecimal(start, i);
                        break;
                    }
                    currentTokenType = VALUE_NUMBER;
                    currentToken = String.valueOf(number);
                    parseIndex = i;
                    break;
                }
                number = number * 10 + (c - '0');
                if (number > Integer.MAX_VALUE) {
                    readDecimal(start, i);
                    break;
                }
                i++;
            }
            return;
        case CHAR_DECIMAL:
            if (types[i] != CHAR_VALUE) {
                currentTokenType = KEYWORD;
                currentToken = ".";
                parseIndex = i;
                return;
            }
            readDecimal(i - 1, i);
            return;
        case CHAR_STRING:
            currentTokenQuoted = true;
            if (chars[i - 1] == '\'') {
                readString(i, '\'');
            } else {
                readString(i, '\"');
            }
            return;
        case CHAR_END:
            currentToken = "";
            currentTokenType = END;
            parseIndex = i;
            return;
        default:
            throw getSyntaxError();
        }
    }