org.argeo.cms/src/org/argeo/cms/internal/auth/LocaleChoice.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.cms.internal.auth;
  17
  18 import java.util.ArrayList;
  19 import java.util.Collections;
  20 import java.util.List;
  21 import java.util.Locale;
  22
  23 import javax.security.auth.callback.LanguageCallback;
  24
  25 import org.argeo.ArgeoException;
  26
  27 /** Choose in a list of locales. TODO: replace with {@link LanguageCallback} */
  28 public class LocaleChoice {
  29         private final List<Locale> locales;
  30
  31         private Integer selectedIndex = null;
  32         private final Integer defaultIndex;
  33
  34         public LocaleChoice(List<Locale> locales, Locale defaultLocale) {
  35                 Integer defaultIndex = null;
  36                 this.locales = Collections.unmodifiableList(locales);
  37                 for (int i = 0; i < locales.size(); i++)
  38                         if (locales.get(i).equals(defaultLocale))
  39                                 defaultIndex = i;
  40
  41                 // based on language only
  42                 if (defaultIndex == null)
  43                         for (int i = 0; i < locales.size(); i++)
  44                                 if (locales.get(i).getLanguage().equals(defaultLocale.getLanguage()))
  45                                         defaultIndex = i;
  46
  47                 if (defaultIndex == null)
  48                         throw new ArgeoException("Default locale " + defaultLocale + " is not in available locales " + locales);
  49                 this.defaultIndex = defaultIndex;
  50
  51                 this.selectedIndex = defaultIndex;
  52         }
  53
  54         /**
  55          * Convenience constructor based on a comma separated list of iso codes (en,
  56          * en_US, fr_CA, etc.). Default selection is default locale.
  57          */
  58         public LocaleChoice(String locales, Locale defaultLocale) {
  59                 this(asLocaleList(locales), defaultLocale);
  60         }
  61
  62         public String[] getSupportedLocalesLabels() {
  63                 String[] labels = new String[locales.size()];
  64                 for (int i = 0; i < locales.size(); i++) {
  65                         Locale locale = locales.get(i);
  66                         if (locale.getCountry().equals(""))
  67                                 labels[i] = locale.getDisplayLanguage(locale) + " [" + locale.getLanguage() + "]";
  68                         else
  69                                 labels[i] = locale.getDisplayLanguage(locale) + " (" + locale.getDisplayCountry(locale) + ") ["
  70                                                 + locale.getLanguage() + "_" + locale.getCountry() + "]";
  71
  72                 }
  73                 return labels;
  74         }
  75
  76         public Locale getSelectedLocale() {
  77                 if (selectedIndex == null)
  78                         return null;
  79                 return locales.get(selectedIndex);
  80         }
  81
  82         public void setSelectedIndex(Integer selectedIndex) {
  83                 this.selectedIndex = selectedIndex;
  84         }
  85
  86         public Integer getSelectedIndex() {
  87                 return selectedIndex;
  88         }
  89
  90         public Integer getDefaultIndex() {
  91                 return defaultIndex;
  92         }
  93
  94         public List<Locale> getLocales() {
  95                 return locales;
  96         }
  97
  98         public Locale getDefaultLocale() {
  99                 return locales.get(getDefaultIndex());
 100         }
 101
 102         /** Returns null if argument is null. */
 103         public static List<Locale> asLocaleList(Object locales) {
 104                 if (locales == null)
 105                         return null;
 106                 ArrayList<Locale> availableLocales = new ArrayList<Locale>();
 107                 String[] codes = locales.toString().split(",");
 108                 for (int i = 0; i < codes.length; i++) {
 109                         String code = codes[i];
 110                         // variant not supported
 111                         int indexUnd = code.indexOf("_");
 112                         Locale locale;
 113                         if (indexUnd > 0) {
 114                                 String language = code.substring(0, indexUnd);
 115                                 String country = code.substring(indexUnd + 1);
 116                                 locale = new Locale(language, country);
 117                         } else {
 118                                 locale = new Locale(code);
 119                         }
 120                         availableLocales.add(locale);
 121                 }
 122                 return availableLocales;
 123         }
 124
 125         public static void main(String[] args) {
 126                 for (String isoL : Locale.getISOLanguages()) {
 127                         Locale locale = new Locale(isoL);
 128                         System.out.println(isoL + "\t" + locale.getDisplayLanguage() + "\t" + locale.getDisplayLanguage(locale));
 129                 }
 130         }
 131
 132 }