src/main/java/eu/svjatoslav/commons/network/navigation/NavigationItem.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.util.ArrayList;
  13 import java.util.HashMap;
  14 import java.util.List;
  15 import java.util.Map;
  16
  17 import eu.svjatoslav.commons.network.Locale;
  18 import eu.svjatoslav.commons.string.WildCardMatcher;
  19
  20 public class NavigationItem {
  21
  22         private String matchingPattern;
  23         private final Map<Locale, String> localeToTitle = new HashMap<Locale, String>();
  24         final ArrayList<NavigationItem> subElements = new ArrayList<NavigationItem>();
  25         final private NavigationItem parent;
  26         final private Navigation navigation;
  27         private final String linkUrl;
  28
  29         /**
  30          * CSS prefix is inherited to child menu items.
  31          */
  32         private String cssPrefix;
  33
  34         public NavigationItem(final Navigation navigation) {
  35                 this.navigation = navigation;
  36                 parent = null;
  37                 matchingPattern = null;
  38                 linkUrl = null;
  39         }
  40
  41         private NavigationItem(final Navigation navigation,
  42                         final NavigationItem parent, final String linkUrl,
  43                         final String... titles) {
  44                 this.navigation = navigation;
  45                 this.parent = parent;
  46                 this.linkUrl = linkUrl;
  47                 matchingPattern = linkUrl;
  48
  49                 initializeLocalizedTitles(titles);
  50         }
  51
  52         public NavigationItem addChild(final String linkUrl, final String... titles) {
  53                 final NavigationItem item = new NavigationItem(navigation, this,
  54                                 linkUrl, titles);
  55                 subElements.add(item);
  56                 return item;
  57         }
  58
  59         protected String getCssPrefix() {
  60                 if (cssPrefix != null)
  61                         return cssPrefix;
  62
  63                 if (parent == null)
  64                         return null;
  65
  66                 return parent.getCssPrefix();
  67         }
  68
  69         public String getLinkUrl() {
  70                 return linkUrl;
  71         }
  72
  73         NavigationItem getMatchingNavigationItem(final String requestPath) {
  74                 if (matchesUrl(requestPath))
  75                         return this;
  76
  77                 for (final NavigationItem childNavigationItem : subElements) {
  78                         final NavigationItem match = childNavigationItem
  79                                         .getMatchingNavigationItem(requestPath);
  80
  81                         if (match != null)
  82                                 return match;
  83                 }
  84                 return null;
  85         }
  86
  87         public List<NavigationItem> getSubElements() {
  88                 return subElements;
  89         }
  90
  91         public String getTitle(final Locale locale) {
  92                 return localeToTitle.get(locale);
  93         }
  94
  95         private void initializeLocalizedTitles(final String... titles) {
  96                 final List<Locale> locales = navigation.getLocaleConfiguration()
  97                                 .getAllowedLocales();
  98                 if (locales.size() != titles.length)
  99                         throw new RuntimeException("There should be exactly "
 100                                         + locales.size() + " title(s).");
 101
 102                 for (int i = 0; i < titles.length; i++)
 103                         localeToTitle.put(locales.get(i), titles[i]);
 104         }
 105
 106         public boolean matchesUrl(final String url) {
 107                 return WildCardMatcher.match(url, matchingPattern);
 108         }
 109
 110         public void setCssPrefix(final String cssPrefix) {
 111                 this.cssPrefix = cssPrefix;
 112         }
 113
 114         public NavigationItem setPattern(final String pattern) {
 115                 matchingPattern = pattern;
 116                 return this;
 117         }
 118
 119 }