ui/base/l10n/l10n_util_android.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/base/l10n/l10n_util_android.h"
   6
   7 #include "base/android/jni_android.h"
   8 #include "base/android/jni_string.h"
   9 #include "base/android/scoped_java_ref.h"
  10 #include "base/i18n/rtl.h"
  11 #include "base/logging.h"
  12 #include "base/strings/string_util.h"
  13 #include "base/time/time.h"
  14 #include "jni/LocalizationUtils_jni.h"
  15 #include "third_party/icu/source/common/unicode/uloc.h"
  16 #include "ui/base/l10n/time_format.h"
  17
  18 namespace l10n_util {
  19
  20 jint GetFirstStrongCharacterDirection(JNIEnv* env, jclass clazz,
  21                                       jstring string) {
  22   return base::i18n::GetFirstStrongCharacterDirection(
  23       base::android::ConvertJavaStringToUTF16(env, string));
  24 }
  25
  26 bool IsLayoutRtl() {
  27   static bool is_layout_rtl_cached = false;
  28   static bool layout_rtl_cache;
  29
  30   if (!is_layout_rtl_cached) {
  31     is_layout_rtl_cached = true;
  32     JNIEnv* env = base::android::AttachCurrentThread();
  33     layout_rtl_cache =
  34         static_cast<bool>(Java_LocalizationUtils_isLayoutRtl(env));
  35   }
  36
  37   return layout_rtl_cache;
  38 }
  39
  40 namespace {
  41
  42 // Common prototype of ICU uloc_getXXX() functions.
  43 typedef int32_t (*UlocGetComponentFunc)(const char*, char*, int32_t,
  44                                         UErrorCode*);
  45
  46 std::string GetLocaleComponent(const std::string& locale,
  47                                UlocGetComponentFunc uloc_func,
  48                                int32_t max_capacity) {
  49   std::string result;
  50   UErrorCode error = U_ZERO_ERROR;
  51   int32_t actual_length = uloc_func(locale.c_str(),
  52                                     base::WriteInto(&result, max_capacity),
  53                                     max_capacity,
  54                                     &error);
  55   DCHECK(U_SUCCESS(error));
  56   DCHECK(actual_length < max_capacity);
  57   result.resize(actual_length);
  58   return result;
  59 }
  60
  61 ScopedJavaLocalRef<jobject> NewJavaLocale(
  62     JNIEnv* env,
  63     const std::string& locale) {
  64   // TODO(wangxianzhu): Use new Locale API once Android supports scripts.
  65   std::string language = GetLocaleComponent(
  66       locale, uloc_getLanguage, ULOC_LANG_CAPACITY);
  67   std::string country = GetLocaleComponent(
  68       locale, uloc_getCountry, ULOC_COUNTRY_CAPACITY);
  69   std::string variant = GetLocaleComponent(
  70       locale, uloc_getVariant, ULOC_FULLNAME_CAPACITY);
  71   return Java_LocalizationUtils_getJavaLocale(env,
  72           base::android::ConvertUTF8ToJavaString(env, language).obj(),
  73           base::android::ConvertUTF8ToJavaString(env, country).obj(),
  74           base::android::ConvertUTF8ToJavaString(env, variant).obj());
  75 }
  76
  77 }  // namespace
  78
  79 base::string16 GetDisplayNameForLocale(const std::string& locale,
  80                                        const std::string& display_locale) {
  81   JNIEnv* env = base::android::AttachCurrentThread();
  82   ScopedJavaLocalRef<jobject> java_locale =
  83       NewJavaLocale(env, locale);
  84   ScopedJavaLocalRef<jobject> java_display_locale =
  85       NewJavaLocale(env, display_locale);
  86
  87   ScopedJavaLocalRef<jstring> java_result(
  88       Java_LocalizationUtils_getDisplayNameForLocale(
  89           env,
  90           java_locale.obj(),
  91           java_display_locale.obj()));
  92   return ConvertJavaStringToUTF16(java_result);
  93 }
  94
  95 jstring GetDurationString(JNIEnv* env, jclass clazz, jlong timeInMillis) {
  96   ScopedJavaLocalRef<jstring> jtime_remaining =
  97       base::android::ConvertUTF16ToJavaString(
  98           env,
  99           ui::TimeFormat::Simple(
 100               ui::TimeFormat::FORMAT_REMAINING, ui::TimeFormat::LENGTH_SHORT,
 101               base::TimeDelta::FromMilliseconds(timeInMillis)));
 102   return jtime_remaining.Release();
 103 }
 104
 105 bool RegisterLocalizationUtil(JNIEnv* env) {
 106   return RegisterNativesImpl(env);
 107 }
 108
 109 }  // namespace l10n_util