jars/icu4j-4_4_2-src/main/classes/core/src/com/ibm/icu/impl/ICUResourceTableAccess.java

   1 /*\r
   2  *******************************************************************************\r
   3  * Copyright (C) 2009, International Business Machines Corporation and         *\r
   4  * others. All Rights Reserved.                                                *\r
   5  *******************************************************************************\r
   6  */\r
   7 package com.ibm.icu.impl;\r
   8 \r
   9 import com.ibm.icu.util.ULocale;\r
  10 import com.ibm.icu.util.UResourceBundle;\r
  11 \r
  12 /**\r
  13  * Static utility functions for probing resource tables, used by ULocale and\r
  14  * LocaleDisplayNames.\r
  15  */\r
  16 public class ICUResourceTableAccess {\r
  17     /**\r
  18      * Utility to fetch locale display data from resource bundle tables.  Convenience\r
  19      * wrapper for {@link #getTableString(ICUResourceBundle, String, String, String)}.\r
  20      */\r
  21     public static String getTableString(String path, ULocale locale, String tableName,\r
  22             String itemName) {\r
  23         ICUResourceBundle bundle = (ICUResourceBundle) UResourceBundle.\r
  24             getBundleInstance(path, locale.getBaseName());\r
  25         return getTableString(bundle, tableName, null, itemName);\r
  26     }\r
  27 \r
  28     /**\r
  29      * Utility to fetch locale display data from resource bundle tables.  Uses fallback\r
  30      * through the "Fallback" resource if available.\r
  31      */\r
  32     public static String getTableString(ICUResourceBundle bundle, String tableName,\r
  33             String subtableName, String item) {\r
  34         try {\r
  35             for (;;) {\r
  36                 // special case currency\r
  37                 if ("currency".equals(subtableName)) {\r
  38                     ICUResourceBundle table = bundle.getWithFallback("Currencies");\r
  39                     table = table.getWithFallback(item);\r
  40                     return table.getString(1);\r
  41                 } else {\r
  42                     ICUResourceBundle table = lookup(bundle, tableName);\r
  43                     if (table == null) {\r
  44                         return item;\r
  45                     }\r
  46                     ICUResourceBundle stable = table;\r
  47                     if (subtableName != null) {\r
  48                         stable = lookup(table, subtableName);\r
  49                     }\r
  50                     if (stable != null) {\r
  51                         ICUResourceBundle sbundle = lookup(stable, item);\r
  52                         if (sbundle != null) {\r
  53                             return sbundle.getString(); // possible real exception\r
  54                         }\r
  55                     }\r
  56 \r
  57                     // if we get here, stable was null, or sbundle was null\r
  58                     if (subtableName == null) {\r
  59                         // may be a deprecated code\r
  60                         String currentName = null;\r
  61                         if (tableName.equals("Countries")) {\r
  62                             currentName = LocaleIDs.getCurrentCountryID(item);\r
  63                         } else if (tableName.equals("Languages")) {\r
  64                             currentName = LocaleIDs.getCurrentLanguageID(item);\r
  65                         }\r
  66                         ICUResourceBundle sbundle = lookup(table, currentName);\r
  67                         if (sbundle != null) {\r
  68                             return sbundle.getString(); // possible real exception\r
  69                         }\r
  70                     }\r
  71 \r
  72                     // still can't figure it out? try the fallback mechanism\r
  73                     ICUResourceBundle fbundle = lookup(table, "Fallback");\r
  74                     if (fbundle == null) {\r
  75                         return item;\r
  76                     }\r
  77 \r
  78                     String fallbackLocale = fbundle.getString(); // again, possible exception\r
  79                     if (fallbackLocale.length() == 0) {\r
  80                         fallbackLocale = "root";\r
  81                     }\r
  82 \r
  83                     if (fallbackLocale.equals(table.getULocale().getName())) {\r
  84                         return item;\r
  85                     }\r
  86 \r
  87                     bundle = (ICUResourceBundle) UResourceBundle.getBundleInstance(\r
  88                             bundle.getBaseName(), fallbackLocale);\r
  89                 }\r
  90             }\r
  91         } catch (Exception e) {\r
  92             // If something is seriously wrong, we might call getString on a resource that is\r
  93             // not a string.  That will throw an exception, which we catch and ignore here.\r
  94         }\r
  95 \r
  96         return item;\r
  97     }\r
  98 \r
  99     // utility to make the call sites in the above code cleaner\r
 100     private static ICUResourceBundle lookup(ICUResourceBundle bundle, String resName) {\r
 101         return ICUResourceBundle.findResourceWithFallback(resName, bundle, null);\r
 102     }\r
 103 }\r