org.argeo.util/src/org/argeo/util/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.util;
  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()
  45                                                 .equals(defaultLocale.getLanguage()))
  46                                         defaultIndex = i;
  47
  48                 if (defaultIndex == null)
  49                         throw new ArgeoException("Default locale " + defaultLocale
  50                                         + " is not in available locales " + locales);
  51                 this.defaultIndex = defaultIndex;
  52
  53                 this.selectedIndex = defaultIndex;
  54         }
  55
  56         /**
  57          * Convenience constructor based on a comma separated list of iso codes (en,
  58          * en_US, fr_CA, etc.). Default selection is default locale.
  59          */
  60         public LocaleChoice(String locales, Locale defaultLocale) {
  61                 this(asLocaleList(locales), defaultLocale);
  62         }
  63
  64         public String[] getSupportedLocalesLabels() {
  65                 String[] labels = new String[locales.size()];
  66                 for (int i = 0; i < locales.size(); i++) {
  67                         Locale locale = locales.get(i);
  68                         if (locale.getCountry().equals(""))
  69                                 labels[i] = locale.getDisplayLanguage(locale) + " ["
  70                                                 + locale.getLanguage() + "]";
  71                         else
  72                                 labels[i] = locale.getDisplayLanguage(locale) + " ("
  73                                                 + locale.getDisplayCountry(locale) + ") ["
  74                                                 + locale.getLanguage() + "_" + locale.getCountry()
  75                                                 + "]";
  76
  77                 }
  78                 return labels;
  79         }
  80
  81         public Locale getSelectedLocale() {
  82                 if (selectedIndex == null)
  83                         return null;
  84                 return locales.get(selectedIndex);
  85         }
  86
  87         public void setSelectedIndex(Integer selectedIndex) {
  88                 this.selectedIndex = selectedIndex;
  89         }
  90
  91         public Integer getSelectedIndex() {
  92                 return selectedIndex;
  93         }
  94
  95         public Integer getDefaultIndex() {
  96                 return defaultIndex;
  97         }
  98
  99         public List<Locale> getLocales() {
 100                 return locales;
 101         }
 102
 103         public Locale getDefaultLocale() {
 104                 return locales.get(getDefaultIndex());
 105         }
 106
 107         /** Returns null if argument is null. */
 108         public static List<Locale> asLocaleList(String locales) {
 109                 if (locales == null)
 110                         return null;
 111                 ArrayList<Locale> availableLocales = new ArrayList<Locale>();
 112                 String[] codes = locales.split(",");
 113                 for (int i = 0; i < codes.length; i++) {
 114                         String code = codes[i];
 115                         // variant not supported
 116                         int indexUnd = code.indexOf("_");
 117                         Locale locale;
 118                         if (indexUnd > 0) {
 119                                 String language = code.substring(0, indexUnd);
 120                                 String country = code.substring(indexUnd + 1);
 121                                 locale = new Locale(language, country);
 122                         } else {
 123                                 locale = new Locale(code);
 124                         }
 125                         availableLocales.add(locale);
 126                 }
 127                 return availableLocales;
 128         }
 129
 130         public static void main(String[] args) {
 131                 for (String isoL : Locale.getISOLanguages()) {
 132                         Locale locale = new Locale(isoL);
 133                         System.out.println(isoL + "\t" + locale.getDisplayLanguage() + "\t"
 134                                         + locale.getDisplayLanguage(locale));
 135                 }
 136         }
 137
 138 }