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

   1 /*
   2  * Svjatoslav Commons - shared library of common functionality.
   3  * Copyright ©2012-2014, 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 java.net.MalformedURLException;
  13 import java.net.URL;
  14
  15 import javax.servlet.http.HttpServletRequest;
  16
  17 public class Navigation {
  18
  19         private NavigationItem rootNavigationItem;
  20
  21         private NavigationItem defaultNavigationItem;
  22
  23         public NavigationItem getDefaultNavigationItem() {
  24                 return defaultNavigationItem;
  25         }
  26
  27         private String getGetNotNullString(final String string) {
  28                 if (string != null)
  29                         return string;
  30
  31                 return "";
  32         }
  33
  34         public NavigationItem getRootNavigationItem() {
  35                 return rootNavigationItem;
  36         }
  37
  38         public NavigationItem getSelectedItem(final HttpServletRequest request) {
  39                 final String requestUrl = request.getRequestURL().toString();
  40
  41                 try {
  42                         final String requestPath = new URL(requestUrl).getPath();
  43
  44                         final NavigationItem match = rootNavigationItem
  45                                         .getMatchingNavigationItem(requestPath);
  46
  47                         if (match != null)
  48                                 return match;
  49                 } catch (final MalformedURLException e) {
  50                         System.out.println("Cannot handle URL: " + requestUrl);
  51                         e.printStackTrace();
  52                 }
  53
  54                 return getDefaultNavigationItem();
  55         }
  56
  57         public String getTopMenu(final HttpServletRequest request) {
  58
  59                 final NavigationItem selectedItem = getSelectedItem(request);
  60                 final StringBuffer result = new StringBuffer();
  61
  62                 result.append("<div class=\""
  63                                 + getGetNotNullString(rootNavigationItem.getCssPrefix())
  64                                 + "navigationMenu\">");
  65
  66                 for (final NavigationItem item : getRootNavigationItem()
  67                                 .getSubElements()) {
  68
  69                         if (item == selectedItem)
  70                                 result.append("<a class=\""
  71                                                 + getGetNotNullString(item.getCssPrefix())
  72                                                 + "menuItemSelected\" href=\"" + item.getLinkUrl()
  73                                                 + "\">");
  74                         else
  75                                 result.append("<a class=\""
  76                                                 + getGetNotNullString(item.getCssPrefix())
  77                                                 + "menuItem\" href=\"" + item.getLinkUrl() + "\">");
  78
  79                         result.append("<div>" + item.getTitle() + "</div>");
  80                         result.append("</a>");
  81                 }
  82
  83                 result.append("</div>");
  84
  85                 return result.toString();
  86         }
  87
  88         public NavigationItem setDefaultNavigationItem(
  89                         final NavigationItem defaultNavigationItem) {
  90                 this.defaultNavigationItem = defaultNavigationItem;
  91                 return defaultNavigationItem;
  92         }
  93
  94         public NavigationItem setRootNavigationItem(
  95                         final NavigationItem rootNavigationItem) {
  96                 this.rootNavigationItem = rootNavigationItem;
  97                 return rootNavigationItem;
  98         }
  99
 100 }