protected void configure()

in velocity-tools-view/src/main/java/org/apache/velocity/tools/view/BreadcrumbTool.java [197:298]
89 lines of code
19 McCabe index (conditional complexity)

    protected void configure(ValueParser config)
    {
        if (request == null)
        {
            getLog().warn("cannot build breadcrumb: no provided request");
            return;
        }
        String encoding = Optional.ofNullable(request.getCharacterEncoding()).orElse("UTF-8");
        String uri = request.getRequestURI();
        try
        {
            uri = URLDecoder.decode(uri, encoding);
        }
        catch (UnsupportedEncodingException uee)
        {
            getLog().error("Cannot decode URI using encoding {}", encoding);
            return;
        }
        // infer extension
        String ext = getExtension(uri);
        // deduce default index page
        String index = "index." + ext;
        if ("/".equals(uri)) uri = "/" + index;
        String elements[] = uri.split("/");
        navigationElements = new ArrayList<NavigationElement>();
        StringBuilder builder = new StringBuilder();

        for (String elem : elements)
        {
            // for each URI path element
            builder.append(elem);
            String currentPath = builder.toString();
            if (index.equals(elem)) continue;
            if (elem.endsWith('.' + ext))
            {
                elem = elem.substring(0, elem.length() - (ext.length() + 1));
            }
            else
            {
                currentPath = currentPath + '/' + index;
                if (elem.length() == 0) elem = "home";
            }
            String name = builder.length() == 0 ? "home" : formatElementName(elem);

            NavigationElement navElem = new NavigationElement(currentPath, name);

            // give a chance to subclasses to customize an item
            if (customize(navElem, request))
            {
                navigationElements.add(navElem);

                // check configuration
                Object obj = config.get(elem);
                if (obj != null && obj instanceof ValueParser)
                {
                    String queryParamName = null;
                    String queryParamValue = null;
                    ValueParser values = (ValueParser) obj;

                    // customize navigation element name
                    String newName = values.getString("name");
                    if (newName != null)
                    {
                        if (newName.startsWith("?"))
                        {
                            queryParamName = newName.substring(1);
                            queryParamValue = request.getParameter(queryParamName);
                            if (queryParamValue != null)
                            {
                                navElem.setName(queryParamValue);
                            }
                        }
                        else
                        {
                            navElem.setName(newName);
                        }
                    }

                    // customize navigation element URL
                    String newURL = values.getString("url");
                    if (queryParamValue == null)
                    {
                        if (newURL != null)
                        {
                            navElem.setUrl(newURL);
                        }
                    }
                    else
                    {
                        if (newURL == null)
                        {
                            newURL = navElem.getUrl();
                        }
                        newURL += newURL.indexOf('?') == -1 ? '?' : '&';
                        newURL += queryParamName + '=' + queryParamValue;
                        navElem.setUrl(newURL);
                    }
                }
            }
            builder.append('/');
        }
    }