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,
  21                                       const JavaParamRef<jclass>& clazz,
  22                                       const JavaParamRef<jstring>& string) {
  23   return base::i18n::GetFirstStrongCharacterDirection(
  24       base::android::ConvertJavaStringToUTF16(env, string));
  25 }
  26
  27 bool IsLayoutRtl() {
  28   static bool is_layout_rtl_cached = false;
  29   static bool layout_rtl_cache;
  30
  31   if (!is_layout_rtl_cached) {
  32     is_layout_rtl_cached = true;
  33     JNIEnv* env = base::android::AttachCurrentThread();
  34     layout_rtl_cache =
  35         static_cast<bool>(Java_LocalizationUtils_isLayoutRtl(env));
  36   }
  37
  38   return layout_rtl_cache;
  39 }
  40
  41 namespace {
  42
  43 // Common prototype of ICU uloc_getXXX() functions.
  44 typedef int32_t (*UlocGetComponentFunc)(const char*, char*, int32_t,
  45                                         UErrorCode*);
  46
  47 std::string GetLocaleComponent(const std::string& locale,
  48                                UlocGetComponentFunc uloc_func,
  49                                int32_t max_capacity) {
  50   std::string result;
  51   UErrorCode error = U_ZERO_ERROR;
  52   int32_t actual_length = uloc_func(locale.c_str(),
  53                                     base::WriteInto(&result, max_capacity),
  54                                     max_capacity,
  55                                     &error);
  56   DCHECK(U_SUCCESS(error));
  57   DCHECK(actual_length < max_capacity);
  58   result.resize(actual_length);
  59   return result;
  60 }
  61
  62 ScopedJavaLocalRef<jobject> NewJavaLocale(
  63     JNIEnv* env,
  64     const std::string& locale) {
  65   // TODO(wangxianzhu): Use new Locale API once Android supports scripts.
  66   std::string language = GetLocaleComponent(
  67       locale, uloc_getLanguage, ULOC_LANG_CAPACITY);
  68   std::string country = GetLocaleComponent(
  69       locale, uloc_getCountry, ULOC_COUNTRY_CAPACITY);
  70   std::string variant = GetLocaleComponent(
  71       locale, uloc_getVariant, ULOC_FULLNAME_CAPACITY);
  72   return Java_LocalizationUtils_getJavaLocale(env,
  73           base::android::ConvertUTF8ToJavaString(env, language).obj(),
  74           base::android::ConvertUTF8ToJavaString(env, country).obj(),
  75           base::android::ConvertUTF8ToJavaString(env, variant).obj());
  76 }
  77
  78 }  // namespace
  79
  80 base::string16 GetDisplayNameForLocale(const std::string& locale,
  81                                        const std::string& display_locale) {
  82   JNIEnv* env = base::android::AttachCurrentThread();
  83   ScopedJavaLocalRef<jobject> java_locale =
  84       NewJavaLocale(env, locale);
  85   ScopedJavaLocalRef<jobject> java_display_locale =
  86       NewJavaLocale(env, display_locale);
  87
  88   ScopedJavaLocalRef<jstring> java_result(
  89       Java_LocalizationUtils_getDisplayNameForLocale(
  90           env,
  91           java_locale.obj(),
  92           java_display_locale.obj()));
  93   return ConvertJavaStringToUTF16(java_result);
  94 }
  95
  96 ScopedJavaLocalRef<jstring> GetDurationString(JNIEnv* env,
  97                                               const JavaParamRef<jclass>& clazz,
  98                                               jlong timeInMillis) {
  99   ScopedJavaLocalRef<jstring> jtime_remaining =
 100       base::android::ConvertUTF16ToJavaString(
 101           env,
 102           ui::TimeFormat::Simple(
 103               ui::TimeFormat::FORMAT_REMAINING, ui::TimeFormat::LENGTH_SHORT,
 104               base::TimeDelta::FromMilliseconds(timeInMillis)));
 105   return jtime_remaining;
 106 }
 107
 108 bool RegisterLocalizationUtil(JNIEnv* env) {
 109   return RegisterNativesImpl(env);
 110 }
 111
 112 }  // namespace l10n_util