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                         final NI match = (NI) rootNavigationItem
  58                                         .getMatchingNavigationItem(requestPath);
  59
  60                         if (match != null)
  61                                 return match;
  62                 } catch (final MalformedURLException e) {
  63                         System.out.println("Cannot handle URL: " + requestUrl);
  64                         e.printStackTrace();
  65                 }
  66
  67                 return getDefaultNavigationItem();
  68         }
  69
  70         public String getTopMenu(final HttpServletRequest request) {
  71
  72                 final String currentLocale = localeConfiguration
  73                                 .detectCurrentLocale(request);
  74
  75                 final NI selectedItem = getSelectedItem(request);
  76                 final StringBuffer result = new StringBuffer();
  77
  78                 result.append("<div class=\""
  79                                 + getGetNotNullString(rootNavigationItem.getCssPrefix())
  80                                 + "navigationMenu\">");
  81
  82                 for (final NI item : (List<NI>) getRootNavigationItem()
  83                                 .getSubElements()) {
  84
  85                         if (item == selectedItem)
  86                                 result.append("<a class=\""
  87                                                 + getGetNotNullString(item.getCssPrefix())
  88                                                 + "menuItemSelected\" href=\"" + item.getLinkUrl()
  89                                                 + "\">");
  90                         else
  91                                 result.append("<a class=\""
  92                                                 + getGetNotNullString(item.getCssPrefix())
  93                                                 + "menuItem\" href=\"" + item.getLinkUrl() + "\">");
  94
  95                         result.append("<div>" + item.getTitle(currentLocale) + "</div>");
  96                         result.append("</a>");
  97                 }
  98
  99                 result.append("</div>");
 100
 101                 return result.toString();
 102         }
 103
 104         public NI setDefaultNavigationItem(final NI defaultNavigationItem) {
 105                 this.defaultNavigationItem = defaultNavigationItem;
 106                 return defaultNavigationItem;
 107         }
 108
 109         public NI setRootNavigationItem(final NI rootNavigationItem) {
 110                 this.rootNavigationItem = rootNavigationItem;
 111                 return rootNavigationItem;
 112         }
 113
 114 }