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         ArrayList<NavigationItem> subElements = new ArrayList<NavigationItem>();
  25         private Locale[] localeOrder;
  26         private NavigationItem parent;
  27         private final String linkUrl;
  28
  29         public NavigationItem(final Locale... localeOrder) {
  30                 if (localeOrder.length == 0)
  31                         this.localeOrder = new Locale[] { Locale.ENG };
  32                 else
  33                         this.localeOrder = localeOrder;
  34
  35                 matchingPattern = null;
  36                 linkUrl = null;
  37         }
  38
  39         public NavigationItem(final NavigationItem parent, final String linkUrl,
  40                         final String... titles) {
  41                 this.parent = parent;
  42                 this.linkUrl = linkUrl;
  43                 matchingPattern = linkUrl;
  44
  45                 initializeLocalizedTitles(titles);
  46         }
  47
  48         public NavigationItem addChild(final String linkUrl, final String... titles) {
  49
  50                 final NavigationItem item = new NavigationItem(this, linkUrl, titles);
  51                 subElements.add(item);
  52
  53                 return item;
  54         }
  55
  56         public String getLinkUrl() {
  57                 return linkUrl;
  58         }
  59
  60         public Locale[] getLocaleOrder() {
  61                 if (localeOrder != null)
  62                         return localeOrder;
  63
  64                 return parent.getLocaleOrder();
  65         }
  66
  67         NavigationItem getMatchingNavigationItem(final String requestPath) {
  68                 if (matchesUrl(requestPath))
  69                         return this;
  70
  71                 for (final NavigationItem childNavigationItem : subElements) {
  72                         final NavigationItem match = childNavigationItem
  73                                         .getMatchingNavigationItem(requestPath);
  74
  75                         if (match != null)
  76                                 return match;
  77                 }
  78                 return null;
  79         }
  80
  81         public List<NavigationItem> getSubElements() {
  82                 return subElements;
  83         }
  84
  85         public String getTitle() {
  86                 if (localeToTitle.size() != 1)
  87                         throw new RuntimeException("there shall be exactly one title");
  88
  89                 return localeToTitle.values().iterator().next();
  90         }
  91
  92         public String getTitle(final Locale locale) {
  93                 return localeToTitle.get(locale);
  94         }
  95
  96         private void initializeLocalizedTitles(final String... titles) {
  97                 final Locale[] locales = getLocaleOrder();
  98                 if (locales.length != titles.length)
  99                         throw new RuntimeException("There should be exactly "
 100                                         + locales.length + " title(s).");
 101
 102                 for (int i = 0; i < titles.length; i++)
 103                         localeToTitle.put(locales[i], titles[i]);
 104         }
 105
 106         public boolean matchesUrl(final String url) {
 107                 return WildCardMatcher.match(url, matchingPattern);
 108         }
 109
 110         public NavigationItem setPattern(final String pattern) {
 111                 matchingPattern = pattern;
 112                 return this;
 113         }
 114
 115 }