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 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")
  55             final NI match = (NI) rootNavigationItem.getMatchingNavigationItem(requestPath);
  56
  57             if (match != null)
  58                 return match;
  59         } catch (final MalformedURLException e) {
  60             System.out.println("Cannot handle URL: " + requestUrl);
  61             e.printStackTrace();
  62         }
  63
  64         return getDefaultNavigationItem();
  65     }
  66
  67     @SuppressWarnings("unchecked")
  68     public String getTopMenu(final HttpServletRequest request) {
  69
  70         final String currentLocale = localeConfiguration.detectCurrentLocale(request);
  71
  72         final NI selectedItem = getSelectedItem(request);
  73         final StringBuilder result = new StringBuilder();
  74
  75         result.append("<div class=\"" + getGetNotNullString(rootNavigationItem.getCssPrefix()) + "navigationMenu\">");
  76
  77         for (final NI item : (List<NI>) getRootNavigationItem().getSubElements()) {
  78
  79             if (item == selectedItem)
  80                 result.append("<a class=\"" + getGetNotNullString(item.getCssPrefix()) + "menuItemSelected\" href=\""
  81                         + item.getLinkUrl() + "\">");
  82             else
  83                 result.append("<a class=\"" + getGetNotNullString(item.getCssPrefix()) + "menuItem\" href=\""
  84                         + item.getLinkUrl() + "\">");
  85
  86             result.append("<div>" + item.getTitle(currentLocale) + "</div>");
  87             result.append("</a>");
  88         }
  89
  90         result.append("</div>");
  91
  92         return result.toString();
  93     }
  94
  95     public NI setDefaultNavigationItem(final NI defaultNavigationItem) {
  96         this.defaultNavigationItem = defaultNavigationItem;
  97         return defaultNavigationItem;
  98     }
  99
 100     public NI setRootNavigationItem(final NI rootNavigationItem) {
 101         this.rootNavigationItem = rootNavigationItem;
 102         return rootNavigationItem;
 103     }
 104
 105 }