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

   1 /*
   2  * Svjatoslav Commons - shared library of common functionality. Author: Svjatoslav Agejenko.
   3  * This project is released under Creative Commons Zero (CC0) license.
   4  */
   5 package eu.svjatoslav.commons.network.navigation;
   6
   7 import javax.servlet.http.HttpServletRequest;
   8 import java.net.MalformedURLException;
   9 import java.net.URL;
  10
  11 public class Navigation {
  12
  13     private NavigationItem root = new NavigationItem(null, null, null);
  14
  15     public NavigationItem getRoot(){
  16         return root;
  17     }
  18
  19     public NavigationItem getSelectedItem(final HttpServletRequest request) {
  20         final String requestUrl = request.getRequestURL().toString();
  21
  22         final String requestPath;
  23         try {
  24             requestPath = new URL(requestUrl).getPath();
  25         } catch (MalformedURLException e) {
  26             throw new IllegalArgumentException("Illegal request URL provided." , e);
  27         }
  28
  29         @SuppressWarnings("unchecked") final NavigationItem match = root.getMatch(requestPath);
  30
  31         if (match != null)
  32             return match;
  33
  34         return root.getDefaultNavigationItem();
  35     }
  36
  37     @SuppressWarnings("unchecked")
  38     public String getTopMenu(final HttpServletRequest request) {
  39
  40         final NavigationItem selectedItem = getSelectedItem(request);
  41         final StringBuilder result = new StringBuilder();
  42
  43         result.append("<div class=\"navigationMenu\">");
  44
  45         for (final NavigationItem item : root.getChildren()) {
  46
  47             if (item == selectedItem)
  48                 result.append("<a class=\"menuItemSelected\" href=\""
  49                         + item.getUrl() + "\">");
  50             else
  51                 result.append("<a class=\"menuItem\" href=\""
  52                         + item.getUrl() + "\">");
  53
  54             result.append("<div>" + item.getTitle() + "</div>");
  55             result.append("</a>");
  56         }
  57
  58         result.append("</div>");
  59
  60         return result.toString();
  61     }
  62
  63 }