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 import java.util.List;
  15
  16 import javax.servlet.http.HttpServletRequest;
  17
  18 import eu.svjatoslav.commons.network.LocaleConfiguration;
  19
  20 public class Navigation<NI extends NavigationItem> {
  21
  22         private NI rootNavigationItem;
  23
  24         private NI defaultNavigationItem;
  25
  26         protected final LocaleConfiguration localeConfiguration;
  27
  28         public Navigation(final LocaleConfiguration localeConfiguration) {
  29                 this.localeConfiguration = localeConfiguration;
  30         }
  31
  32         public NI getDefaultNavigationItem() {
  33                 return defaultNavigationItem;
  34         }
  35
  36         private String getGetNotNullString(final String string) {
  37                 if (string != null)
  38                         return string;
  39
  40                 return "";
  41         }
  42
  43         public LocaleConfiguration getLocaleConfiguration() {
  44                 return localeConfiguration;
  45         }
  46
  47         public NI getRootNavigationItem() {
  48                 return rootNavigationItem;
  49         }
  50
  51         public NI getSelectedItem(final HttpServletRequest request) {
  52                 final String requestUrl = request.getRequestURL().toString();
  53
  54                 try {
  55                         final String requestPath = new URL(requestUrl).getPath();
  56
  57                         @SuppressWarnings("unchecked")
  58                         final NI match = (NI) rootNavigationItem
  59                                         .getMatchingNavigationItem(requestPath);
  60
  61                         if (match != null)
  62                                 return match;
  63                 } catch (final MalformedURLException e) {
  64                         System.out.println("Cannot handle URL: " + requestUrl);
  65                         e.printStackTrace();
  66                 }
  67
  68                 return getDefaultNavigationItem();
  69         }
  70
  71         @SuppressWarnings("unchecked")
  72         public String getTopMenu(final HttpServletRequest request) {
  73
  74                 final String currentLocale = localeConfiguration
  75                                 .detectCurrentLocale(request);
  76
  77                 final NI selectedItem = getSelectedItem(request);
  78                 final StringBuffer result = new StringBuffer();
  79
  80                 result.append("<div class=\""
  81                                 + getGetNotNullString(rootNavigationItem.getCssPrefix())
  82                                 + "navigationMenu\">");
  83
  84                 for (final NI item : (List<NI>) getRootNavigationItem()
  85                                 .getSubElements()) {
  86
  87                         if (item == selectedItem)
  88                                 result.append("<a class=\""
  89                                                 + getGetNotNullString(item.getCssPrefix())
  90                                                 + "menuItemSelected\" href=\"" + item.getLinkUrl()
  91                                                 + "\">");
  92                         else
  93                                 result.append("<a class=\""
  94                                                 + getGetNotNullString(item.getCssPrefix())
  95                                                 + "menuItem\" href=\"" + item.getLinkUrl() + "\">");
  96
  97                         result.append("<div>" + item.getTitle(currentLocale) + "</div>");
  98                         result.append("</a>");
  99                 }
 100
 101                 result.append("</div>");
 102
 103                 return result.toString();
 104         }
 105
 106         public NI setDefaultNavigationItem(final NI defaultNavigationItem) {
 107                 this.defaultNavigationItem = defaultNavigationItem;
 108                 return defaultNavigationItem;
 109         }
 110
 111         public NI setRootNavigationItem(final NI rootNavigationItem) {
 112                 this.rootNavigationItem = rootNavigationItem;
 113                 return rootNavigationItem;
 114         }
 115
 116 }