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.Locale;
  19 import eu.svjatoslav.commons.network.LocaleConfiguration;
  20
  21 public class Navigation<NI extends NavigationItem> {
  22
  23         private NI rootNavigationItem;
  24
  25         private NI defaultNavigationItem;
  26
  27         protected final LocaleConfiguration localeConfiguration;
  28
  29         public Navigation(final LocaleConfiguration localeConfiguration) {
  30                 this.localeConfiguration = localeConfiguration;
  31         }
  32
  33         public NI getDefaultNavigationItem() {
  34                 return defaultNavigationItem;
  35         }
  36
  37         private String getGetNotNullString(final String string) {
  38                 if (string != null)
  39                         return string;
  40
  41                 return "";
  42         }
  43
  44         public LocaleConfiguration getLocaleConfiguration() {
  45                 return localeConfiguration;
  46         }
  47
  48         public NI getRootNavigationItem() {
  49                 return rootNavigationItem;
  50         }
  51
  52         public NI getSelectedItem(final HttpServletRequest request) {
  53                 final String requestUrl = request.getRequestURL().toString();
  54
  55                 try {
  56                         final String requestPath = new URL(requestUrl).getPath();
  57
  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         public String getTopMenu(final HttpServletRequest request) {
  72
  73                 final Locale currentLocale = localeConfiguration
  74                                 .detectCurrentLocale(request);
  75
  76                 final NI selectedItem = getSelectedItem(request);
  77                 final StringBuffer result = new StringBuffer();
  78
  79                 result.append("<div class=\""
  80                                 + getGetNotNullString(rootNavigationItem.getCssPrefix())
  81                                 + "navigationMenu\">");
  82
  83                 for (final NI item : (List<NI>) getRootNavigationItem()
  84                                 .getSubElements()) {
  85
  86                         if (item == selectedItem)
  87                                 result.append("<a class=\""
  88                                                 + getGetNotNullString(item.getCssPrefix())
  89                                                 + "menuItemSelected\" href=\"" + item.getLinkUrl()
  90                                                 + "\">");
  91                         else
  92                                 result.append("<a class=\""
  93                                                 + getGetNotNullString(item.getCssPrefix())
  94                                                 + "menuItem\" href=\"" + item.getLinkUrl() + "\">");
  95
  96                         result.append("<div>" + item.getTitle(currentLocale) + "</div>");
  97                         result.append("</a>");
  98                 }
  99
 100                 result.append("</div>");
 101
 102                 return result.toString();
 103         }
 104
 105         public NI setDefaultNavigationItem(final NI defaultNavigationItem) {
 106                 this.defaultNavigationItem = defaultNavigationItem;
 107                 return defaultNavigationItem;
 108         }
 109
 110         public NI setRootNavigationItem(final NI rootNavigationItem) {
 111                 this.rootNavigationItem = rootNavigationItem;
 112                 return rootNavigationItem;
 113         }
 114
 115 }