public static HsqlProperties parseURL()

in HSQL/src/org/hsqldb1/DatabaseURL.java [122:267]
119 lines of code
29 McCabe index (conditional complexity)

    public static HsqlProperties parseURL(String url, boolean hasPrefix) {

        String         urlImage   = url.toLowerCase(Locale.ENGLISH);
        HsqlProperties props      = new HsqlProperties();
        HsqlProperties extraProps = null;
        String         arguments  = null;
        int            pos        = 0;

        if (hasPrefix) {
            if (urlImage.startsWith(S_URL_PREFIX)) {
                pos = S_URL_PREFIX.length();
            } else {
                return props;
            }
        }

        String  type = null;
        String  host;
        int     port = 0;
        String  database;
        String  path;
        boolean isNetwork = false;

        props.setProperty("url", url);

        int semicolpos = url.indexOf(';', pos);

        if (semicolpos < 0) {
            semicolpos = url.length();
        } else {
            arguments = urlImage.substring(semicolpos + 1, urlImage.length());
            extraProps = HsqlProperties.delimitedArgPairsToProps(arguments,
                    "=", ";", null);

            //todo - check if properties have valid names / values
            props.addProperties(extraProps);
        }

        if (semicolpos == pos + 1 && urlImage.startsWith(S_DOT, pos)) {
            type = S_DOT;
        } else if (urlImage.startsWith(S_MEM, pos)) {
            type = S_MEM;
        } else if (urlImage.startsWith(S_FILE, pos)) {
            type = S_FILE;
        } else if (urlImage.startsWith(S_RES, pos)) {
            type = S_RES;
        } else if (urlImage.startsWith(S_ALIAS, pos)) {
            type = S_ALIAS;
        } else if (urlImage.startsWith(S_HSQL, pos)) {
            type      = S_HSQL;
            port      = ServerConstants.SC_DEFAULT_HSQL_SERVER_PORT;
            isNetwork = true;
        } else if (urlImage.startsWith(S_HSQLS, pos)) {
            type      = S_HSQLS;
            port      = ServerConstants.SC_DEFAULT_HSQLS_SERVER_PORT;
            isNetwork = true;
        } else if (urlImage.startsWith(S_HTTP, pos)) {
            type      = S_HTTP;
            port      = ServerConstants.SC_DEFAULT_HTTP_SERVER_PORT;
            isNetwork = true;
        } else if (urlImage.startsWith(S_HTTPS, pos)) {
            type      = S_HTTPS;
            port      = ServerConstants.SC_DEFAULT_HTTPS_SERVER_PORT;
            isNetwork = true;
        }

        if (type == null) {
            type = S_FILE;
        } else if (type == S_DOT) {
            type = S_MEM;

            // keep pos
        } else {
            pos += type.length();
        }

        props.setProperty("connection_type", type);

        if (isNetwork) {
            int slashpos = url.indexOf('/', pos);

            if (slashpos < pos || slashpos > semicolpos) {
                slashpos = semicolpos;
            }

            int colonpos = url.indexOf(':', pos);

            if (colonpos < pos || colonpos > slashpos) {
                colonpos = slashpos;
            } else {
                try {
                    port = Integer.parseInt(url.substring(colonpos + 1,
                                                          slashpos));
                } catch (NumberFormatException e) {
                    return null;
                }
            }

            host = urlImage.substring(pos, colonpos);

            int secondslashpos = url.lastIndexOf('/', semicolpos);

            if (secondslashpos < pos) {
                path     = "/";
                database = "";
            } else if (secondslashpos == slashpos) {
                path     = "/";
                database = urlImage.substring(secondslashpos + 1, semicolpos);
            } else {
                path     = url.substring(slashpos, secondslashpos);
                database = urlImage.substring(secondslashpos + 1, semicolpos);
            }

            props.setProperty("port", port);
            props.setProperty("host", host);
            props.setProperty("path", path);

            if (extraProps != null) {
                String filePath = extraProps.getProperty("filepath");

                if (filePath != null && database.length() != 0) {
                    database += ";" + filePath;
                }
            }
        } else {
            if (type == S_MEM) {
                database = urlImage.substring(pos, semicolpos);
            } else if (type == S_RES) {
                database = url.substring(pos, semicolpos);

                if (database.indexOf('/') != 0) {
                    database = '/' + database;
                }
            } else {
                database = url.substring(pos, semicolpos);
            }

            if (database.length() == 0) {
                return null;
            }
        }

        props.setProperty("database", database);

        return props;
    }