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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      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 
     17 package com.ibm.icu4jni.util;
     18 
     19 import java.util.Locale;
     20 
     21 /**
     22  * Makes ICU data accessible to Java.
     23  */
     24 public final class ICU {
     25     /**
     26      * Cache for ISO language names.
     27      */
     28     private static String[] isoLanguages;
     29 
     30     /**
     31      * Cache for ISO country names.
     32      */
     33     private static String[] isoCountries;
     34 
     35     /**
     36      * Returns an array of ISO language names (two-letter codes), fetched either
     37      * from ICU's database or from our memory cache.
     38      *
     39      * @return The array.
     40      */
     41     public static String[] getISOLanguages() {
     42         if (isoLanguages == null) {
     43             isoLanguages = getISOLanguagesNative();
     44         }
     45         return isoLanguages.clone();
     46     }
     47 
     48     /**
     49      * Returns an array of ISO country names (two-letter codes), fetched either
     50      * from ICU's database or from our memory cache.
     51      *
     52      * @return The array.
     53      */
     54     public static String[] getISOCountries() {
     55         if (isoCountries == null) {
     56             isoCountries = getISOCountriesNative();
     57         }
     58         return isoCountries.clone();
     59     }
     60 
     61     /**
     62      * Returns the appropriate {@code Locale} given a {@code String} of the form returned
     63      * by {@code toString}. This is very lenient, and doesn't care what's between the underscores:
     64      * this method can parse strings that {@code Locale.toString} won't produce.
     65      * Used to remove duplication.
     66      */
     67     public static Locale localeFromString(String localeName) {
     68         int first = localeName.indexOf('_');
     69         int second = localeName.indexOf('_', first + 1);
     70         if (first == -1) {
     71             // Language only ("ja").
     72             return new Locale(localeName);
     73         } else if (second == -1) {
     74             // Language and country ("ja_JP").
     75             return new Locale(localeName.substring(0, first), localeName.substring(first + 1));
     76         } else {
     77             // Language and country and variant ("ja_JP_TRADITIONAL").
     78             return new Locale(localeName.substring(0, first), localeName.substring(first + 1, second), localeName.substring(second + 1));
     79         }
     80     }
     81 
     82     public static Locale[] localesFromStrings(String[] localeNames) {
     83         Locale[] result = new Locale[localeNames.length];
     84         for (int i = 0; i < result.length; ++i) {
     85             result[i] = localeFromString(localeNames[i]);
     86         }
     87         return result;
     88     }
     89 
     90     private static Locale[] availableLocalesCache;
     91     public static Locale[] getAvailableLocales() {
     92         if (availableLocalesCache == null) {
     93             availableLocalesCache = localesFromStrings(getAvailableLocalesNative());
     94         }
     95         return availableLocalesCache.clone();
     96     }
     97 
     98     public static Locale[] getAvailableBreakIteratorLocales() {
     99         return localesFromStrings(getAvailableBreakIteratorLocalesNative());
    100     }
    101 
    102     public static Locale[] getAvailableCalendarLocales() {
    103         return localesFromStrings(getAvailableCalendarLocalesNative());
    104     }
    105 
    106     public static Locale[] getAvailableCollatorLocales() {
    107         return localesFromStrings(getAvailableCollatorLocalesNative());
    108     }
    109 
    110     public static Locale[] getAvailableDateFormatLocales() {
    111         return localesFromStrings(getAvailableDateFormatLocalesNative());
    112     }
    113 
    114     public static Locale[] getAvailableDateFormatSymbolsLocales() {
    115         return getAvailableDateFormatLocales();
    116     }
    117 
    118     public static Locale[] getAvailableDecimalFormatSymbolsLocales() {
    119         return getAvailableNumberFormatLocales();
    120     }
    121 
    122     public static Locale[] getAvailableNumberFormatLocales() {
    123         return localesFromStrings(getAvailableNumberFormatLocalesNative());
    124     }
    125 
    126     // --- Case mapping.
    127 
    128     public static native String toLowerCase(String s, String localeName);
    129     public static native String toUpperCase(String s, String localeName);
    130 
    131     // --- Native methods accessing ICU's database.
    132 
    133     private static native String[] getAvailableBreakIteratorLocalesNative();
    134     private static native String[] getAvailableCalendarLocalesNative();
    135     private static native String[] getAvailableCollatorLocalesNative();
    136     private static native String[] getAvailableDateFormatLocalesNative();
    137     private static native String[] getAvailableLocalesNative();
    138     private static native String[] getAvailableNumberFormatLocalesNative();
    139 
    140     public static native String getCurrencyCodeNative(String locale);
    141     public static native int getCurrencyFractionDigitsNative(String currencyCode);
    142     public static native String getCurrencySymbolNative(String locale, String currencyCode);
    143 
    144     public static native String getDisplayCountryNative(String countryCode, String locale);
    145     public static native String getDisplayLanguageNative(String languageCode, String locale);
    146     public static native String getDisplayVariantNative(String variantCode, String locale);
    147 
    148     public static native String getISO3CountryNative(String locale);
    149     public static native String getISO3LanguageNative(String locale);
    150 
    151     private static native String[] getISOLanguagesNative();
    152     private static native String[] getISOCountriesNative();
    153 
    154     static native boolean initLocaleDataImpl(String locale, LocaleData result);
    155 }
    156