src/main/java/eu/svjatoslav/commons/network/navigation/Navigation.java

   1 /*
   2  * Svjatoslav Commons - shared library of common functionality.
   3  * Copyright ©2012-2019, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 3 of the GNU Lesser General Public License
   7  * or later as published by the Free Software Foundation.
   8  */
   9
  10 package eu.svjatoslav.commons.network.navigation;
  11
  12 import javax.servlet.http.HttpServletRequest;
  13 import java.net.MalformedURLException;
  14 import java.net.URL;
  15
  16 public class Navigation {
  17
  18     private NavigationItem root = new NavigationItem(null, null, null);
  19
  20     public NavigationItem getRoot(){
  21         return root;
  22     }
  23
  24     public NavigationItem getSelectedItem(final HttpServletRequest request) {
  25         final String requestUrl = request.getRequestURL().toString();
  26
  27         final String requestPath;
  28         try {
  29             requestPath = new URL(requestUrl).getPath();
  30         } catch (MalformedURLException e) {
  31             throw new IllegalArgumentException("Illegal request URL provided." , e);
  32         }
  33
  34         @SuppressWarnings("unchecked") final NavigationItem match = root.getMatch(requestPath);
  35
  36         if (match != null)
  37             return match;
  38
  39         return root.getDefaultNavigationItem();
  40     }
  41
  42     @SuppressWarnings("unchecked")
  43     public String getTopMenu(final HttpServletRequest request) {
  44
  45         final NavigationItem selectedItem = getSelectedItem(request);
  46         final StringBuilder result = new StringBuilder();
  47
  48         result.append("<div class=\"navigationMenu\">");
  49
  50         for (final NavigationItem item : root.getChildren()) {
  51
  52             if (item == selectedItem)
  53                 result.append("<a class=\"menuItemSelected\" href=\""
  54                         + item.getUrl() + "\">");
  55             else
  56                 result.append("<a class=\"menuItem\" href=\""
  57                         + item.getUrl() + "\">");
  58
  59             result.append("<div>" + item.getTitle() + "</div>");
  60             result.append("</a>");
  61         }
  62
  63         result.append("</div>");
  64
  65         return result.toString();
  66     }
  67
  68 }