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

   1 /*
   2  * Svjatoslav Commons - shared library of common functionality.
   3  * Copyright ©2012-2017, 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 eu.svjatoslav.commons.network.LocaleConfiguration;
  13
  14 import javax.servlet.http.HttpServletRequest;
  15 import java.net.MalformedURLException;
  16 import java.net.URL;
  17 import java.util.List;
  18
  19 public class Navigation<NI extends NavigationItem> {
  20
  21     protected final LocaleConfiguration localeConfiguration;
  22     private NI rootNavigationItem;
  23     private NI defaultNavigationItem;
  24
  25     public Navigation(final LocaleConfiguration localeConfiguration) {
  26         this.localeConfiguration = localeConfiguration;
  27     }
  28
  29     public NI getDefaultNavigationItem() {
  30         return defaultNavigationItem;
  31     }
  32
  33     private String getGetNotNullString(final String string) {
  34         if (string != null)
  35             return string;
  36
  37         return "";
  38     }
  39
  40     public LocaleConfiguration getLocaleConfiguration() {
  41         return localeConfiguration;
  42     }
  43
  44     public NI getRootNavigationItem() {
  45         return rootNavigationItem;
  46     }
  47
  48     public NI getSelectedItem(final HttpServletRequest request) {
  49         final String requestUrl = request.getRequestURL().toString();
  50
  51         try {
  52             final String requestPath = new URL(requestUrl).getPath();
  53
  54             @SuppressWarnings("unchecked") final NI match = (NI) rootNavigationItem.getMatchingNavigationItem(requestPath);
  55
  56             if (match != null)
  57                 return match;
  58         } catch (final MalformedURLException e) {
  59             System.out.println("Cannot handle URL: " + requestUrl);
  60             e.printStackTrace();
  61         }
  62
  63         return getDefaultNavigationItem();
  64     }
  65
  66     @SuppressWarnings("unchecked")
  67     public String getTopMenu(final HttpServletRequest request) {
  68
  69         final String currentLocale = localeConfiguration.detectCurrentLocale(request);
  70
  71         final NI selectedItem = getSelectedItem(request);
  72         final StringBuilder result = new StringBuilder();
  73
  74         result.append("<div class=\"" + getGetNotNullString(rootNavigationItem.getCssPrefix()) + "navigationMenu\">");
  75
  76         for (final NI item : (List<NI>) getRootNavigationItem().getSubElements()) {
  77
  78             if (item == selectedItem)
  79                 result.append("<a class=\"" + getGetNotNullString(item.getCssPrefix()) + "menuItemSelected\" href=\""
  80                         + item.getLinkUrl() + "\">");
  81             else
  82                 result.append("<a class=\"" + getGetNotNullString(item.getCssPrefix()) + "menuItem\" href=\""
  83                         + item.getLinkUrl() + "\">");
  84
  85             result.append("<div>" + item.getTitle(currentLocale) + "</div>");
  86             result.append("</a>");
  87         }
  88
  89         result.append("</div>");
  90
  91         return result.toString();
  92     }
  93
  94     public NI setDefaultNavigationItem(final NI defaultNavigationItem) {
  95         this.defaultNavigationItem = defaultNavigationItem;
  96         return defaultNavigationItem;
  97     }
  98
  99     public NI setRootNavigationItem(final NI rootNavigationItem) {
 100         this.rootNavigationItem = rootNavigationItem;
 101         return rootNavigationItem;
 102     }
 103
 104 }