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.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         @SuppressWarnings("unchecked")
  71         public String getTopMenu(final HttpServletRequest request) {
  72
  73                 final String currentLocale = localeConfiguration.detectCurrentLocale(request);
  74
  75                 final NI selectedItem = getSelectedItem(request);
  76                 final StringBuffer result = new StringBuffer();
  77
  78                 result.append("<div class=\"" + getGetNotNullString(rootNavigationItem.getCssPrefix()) + "navigationMenu\">");
  79
  80                 for (final NI item : (List<NI>) getRootNavigationItem().getSubElements()) {
  81
  82                         if (item == selectedItem)
  83                                 result.append("<a class=\"" + getGetNotNullString(item.getCssPrefix()) + "menuItemSelected\" href=\""
  84                                                 + item.getLinkUrl() + "\">");
  85                         else
  86                                 result.append("<a class=\"" + getGetNotNullString(item.getCssPrefix()) + "menuItem\" href=\""
  87                                                 + item.getLinkUrl() + "\">");
  88
  89                         result.append("<div>" + item.getTitle(currentLocale) + "</div>");
  90                         result.append("</a>");
  91                 }
  92
  93                 result.append("</div>");
  94
  95                 return result.toString();
  96         }
  97
  98         public NI setDefaultNavigationItem(final NI defaultNavigationItem) {
  99                 this.defaultNavigationItem = defaultNavigationItem;
 100                 return defaultNavigationItem;
 101         }
 102
 103         public NI setRootNavigationItem(final NI rootNavigationItem) {
 104                 this.rootNavigationItem = rootNavigationItem;
 105                 return rootNavigationItem;
 106         }
 107
 108 }