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

   1 /*\r
   2  ******************************************************************************\r
   3  * Copyright (C) 2007-2009, International Business Machines Corporation and   *\r
   4  * others. All Rights Reserved.                                               *\r
   5  ******************************************************************************\r
   6  */\r
   7 \r
   8 package com.ibm.icu.impl.duration.impl;\r
   9 \r
  10 import java.io.BufferedReader;\r
  11 import java.io.IOException;\r
  12 import java.io.InputStream;\r
  13 import java.io.InputStreamReader;\r
  14 import java.io.UnsupportedEncodingException;\r
  15 import java.util.ArrayList;\r
  16 import java.util.Collection;\r
  17 import java.util.Collections;\r
  18 import java.util.HashMap;\r
  19 import java.util.List;\r
  20 import java.util.Map;\r
  21 import java.util.MissingResourceException;\r
  22 \r
  23 import com.ibm.icu.impl.ICUData;\r
  24 \r
  25 /**\r
  26  * A PeriodFormatterDataService that serves PeriodFormatterData objects based on\r
  27  * data files stored as resources in this directory. These are text files named\r
  28  * after the locale, for example, 'pfd_he_IL.txt' specifies an period formatter\r
  29  * data file for Hebrew as spoken in Israel. Data is in a JSON-like format.\r
  30  */\r
  31 public class ResourceBasedPeriodFormatterDataService extends\r
  32         PeriodFormatterDataService {\r
  33     private Collection<String> availableLocales; // of String\r
  34 \r
  35     private PeriodFormatterData lastData = null;\r
  36     private String lastLocale = null;\r
  37     private Map<String, PeriodFormatterData> cache = new HashMap<String, PeriodFormatterData>(); // String -> PeriodFormatterData\r
  38     // private PeriodFormatterData fallbackFormatterData;\r
  39 \r
  40     private static final String PATH = "data/";\r
  41 \r
  42     private static final ResourceBasedPeriodFormatterDataService singleton = new ResourceBasedPeriodFormatterDataService();\r
  43 \r
  44     /**\r
  45      * Returns the singleton instance of this class.\r
  46      */\r
  47     public static ResourceBasedPeriodFormatterDataService getInstance() {\r
  48         return singleton;\r
  49     }\r
  50 \r
  51     /**\r
  52      * Constructs the service.\r
  53      */\r
  54     private ResourceBasedPeriodFormatterDataService() {\r
  55         List<String> localeNames = new ArrayList<String>(); // of String\r
  56         InputStream is = ICUData.getRequiredStream(getClass(), PATH\r
  57                 + "index.txt");\r
  58         try {\r
  59             BufferedReader br = new BufferedReader(new InputStreamReader(is,\r
  60                     "UTF-8"));\r
  61             String string = null;\r
  62             while (null != (string = br.readLine())) {\r
  63                 string = string.trim();\r
  64                 if (string.startsWith("#") || string.length() == 0) {\r
  65                     continue;\r
  66                 }\r
  67                 localeNames.add(string);\r
  68             }\r
  69         } catch (IOException e) {\r
  70             throw new IllegalStateException("IO Error reading " + PATH\r
  71                     + "index.txt: " + e.toString());\r
  72         }\r
  73         availableLocales = Collections.unmodifiableList(localeNames);\r
  74     }\r
  75 \r
  76     public PeriodFormatterData get(String localeName) {\r
  77         // remove tag info including calendar, we don't use the calendar\r
  78         int x = localeName.indexOf('@');\r
  79         if (x != -1) {\r
  80             localeName = localeName.substring(0, x);\r
  81         }\r
  82 \r
  83         synchronized (this) {\r
  84             if (lastLocale != null && lastLocale.equals(localeName)) {\r
  85                 return lastData;\r
  86             }\r
  87 \r
  88             PeriodFormatterData ld = cache.get(localeName);\r
  89             if (ld == null) {\r
  90                 String ln = localeName;\r
  91                 while (!availableLocales.contains(ln)) {\r
  92                     int ix = ln.lastIndexOf("_");\r
  93                     if (ix > -1) {\r
  94                         ln = ln.substring(0, ix);\r
  95                     } else if (!"test".equals(ln)) {\r
  96                         ln = "test";\r
  97                     } else {\r
  98                         ln = null;\r
  99                         break;\r
 100                     }\r
 101                 }\r
 102                 if (ln != null) {\r
 103                     String name = PATH + "pfd_" + ln + ".xml";\r
 104                     try {\r
 105                         InputStream is = ICUData.getStream(getClass(), name);\r
 106                         if (is == null) {\r
 107                             throw new MissingResourceException(\r
 108                                     "no resource named " + name, name, "");\r
 109                         } else {\r
 110                             DataRecord dr = DataRecord.read(ln,\r
 111                                     new XMLRecordReader(new InputStreamReader(\r
 112                                             is, "UTF-8")));\r
 113                             if (dr != null) {\r
 114                                 // debug\r
 115                                 // if (false && ln.equals("ar_EG")) {\r
 116                                 // OutputStreamWriter osw = new\r
 117                                 // OutputStreamWriter(System.out, "UTF-8");\r
 118                                 // XMLRecordWriter xrw = new\r
 119                                 // XMLRecordWriter(osw);\r
 120                                 // dr.write(xrw);\r
 121                                 // osw.flush();\r
 122                                 // }\r
 123                                 ld = new PeriodFormatterData(localeName, dr);\r
 124                             }\r
 125                         }\r
 126                     } catch (UnsupportedEncodingException e) {\r
 127                         throw new MissingResourceException(\r
 128                                 "Unhandled Encoding for resource " + name,\r
 129                                 name, "");\r
 130                     }\r
 131                 } else {\r
 132                     throw new MissingResourceException(\r
 133                             "Duration data not found for  " + localeName, PATH,\r
 134                             localeName);\r
 135                 }\r
 136 \r
 137                 // if (ld == null) {\r
 138                 // ld = getFallbackFormatterData();\r
 139                 // }\r
 140                 cache.put(localeName, ld);\r
 141             }\r
 142             lastData = ld;\r
 143             lastLocale = localeName;\r
 144 \r
 145             return ld;\r
 146         }\r
 147     }\r
 148 \r
 149     public Collection<String> getAvailableLocales() {\r
 150         return availableLocales;\r
 151     }\r
 152 \r
 153     // PeriodFormatterData getFallbackFormatterData() {\r
 154     // synchronized (this) {\r
 155     // if (fallbackFormatterData == null) {\r
 156     // DataRecord dr = new DataRecord(); // hack, no default, will die if used\r
 157     // fallbackFormatterData = new PeriodFormatterData(null, dr);\r
 158     // }\r
 159     // return fallbackFormatterData;\r
 160     // }\r
 161     // }\r
 162 }\r