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      1 /*
      2  * Copyright (C) 2010 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 #define LOG_TAG "TimeZoneNames"
     18 
     19 #include "IcuUtilities.h"
     20 #include "JNIHelp.h"
     21 #include "JniConstants.h"
     22 #include "JniException.h"
     23 #include "ScopedJavaUnicodeString.h"
     24 #include "ScopedLocalRef.h"
     25 #include "ScopedUtfChars.h"
     26 #include "UniquePtr.h"
     27 #include "unicode/calendar.h"
     28 #include "unicode/timezone.h"
     29 #include "unicode/tznames.h"
     30 
     31 static bool isUtc(const UnicodeString& id) {
     32   static const UnicodeString kEtcUct("Etc/UCT", 7, US_INV);
     33   static const UnicodeString kEtcUtc("Etc/UTC", 7, US_INV);
     34   static const UnicodeString kEtcUniversal("Etc/Universal", 13, US_INV);
     35   static const UnicodeString kEtcZulu("Etc/Zulu", 8, US_INV);
     36 
     37   static const UnicodeString kUct("UCT", 3, US_INV);
     38   static const UnicodeString kUtc("UTC", 3, US_INV);
     39   static const UnicodeString kUniversal("Universal", 9, US_INV);
     40   static const UnicodeString kZulu("Zulu", 4, US_INV);
     41 
     42   return id == kEtcUct || id == kEtcUtc || id == kEtcUniversal || id == kEtcZulu ||
     43       id == kUct || id == kUtc || id == kUniversal || id == kZulu;
     44 }
     45 
     46 static void setStringArrayElement(JNIEnv* env, jobjectArray array, int i, const UnicodeString& s) {
     47   // Fill in whatever we got. We don't use the display names if they're "GMT[+-]xx:xx"
     48   // because icu4c doesn't use the up-to-date time zone transition data, so it gets these
     49   // wrong. TimeZone.getDisplayName creates accurate names on demand.
     50   // TODO: investigate whether it's worth doing that work once in the Java wrapper instead of on-demand.
     51   static const UnicodeString kGmt("GMT", 3, US_INV);
     52   if (!s.isBogus() && !s.startsWith(kGmt)) {
     53     ScopedLocalRef<jstring> javaString(env, env->NewString(s.getBuffer(), s.length()));
     54     env->SetObjectArrayElement(array, i, javaString.get());
     55   }
     56 }
     57 
     58 static void TimeZoneNames_fillZoneStrings(JNIEnv* env, jclass, jstring localeName, jobjectArray result) {
     59   Locale locale = getLocale(env, localeName);
     60 
     61   UErrorCode status = U_ZERO_ERROR;
     62   UniquePtr<TimeZoneNames> names(TimeZoneNames::createInstance(locale, status));
     63   if (maybeThrowIcuException(env, "TimeZoneNames::createInstance", status)) {
     64     return;
     65   }
     66 
     67   const UDate now(Calendar::getNow());
     68 
     69   static const UnicodeString kUtc("UTC", 3, US_INV);
     70   static const UnicodeString pacific_apia("Pacific/Apia", 12, US_INV);
     71 
     72   size_t id_count = env->GetArrayLength(result);
     73   for (size_t i = 0; i < id_count; ++i) {
     74     ScopedLocalRef<jobjectArray> java_row(env,
     75                                           reinterpret_cast<jobjectArray>(env->GetObjectArrayElement(result, i)));
     76     ScopedLocalRef<jstring> java_zone_id(env,
     77                                          reinterpret_cast<jstring>(env->GetObjectArrayElement(java_row.get(), 0)));
     78     ScopedJavaUnicodeString zone_id(env, java_zone_id.get());
     79     if (!zone_id.valid()) {
     80       return;
     81     }
     82 
     83     UnicodeString long_std;
     84     names->getDisplayName(zone_id.unicodeString(), UTZNM_LONG_STANDARD, now, long_std);
     85     UnicodeString short_std;
     86     names->getDisplayName(zone_id.unicodeString(), UTZNM_SHORT_STANDARD, now, short_std);
     87     UnicodeString long_dst;
     88     names->getDisplayName(zone_id.unicodeString(), UTZNM_LONG_DAYLIGHT, now, long_dst);
     89     UnicodeString short_dst;
     90     names->getDisplayName(zone_id.unicodeString(), UTZNM_SHORT_DAYLIGHT, now, short_dst);
     91 
     92     if (isUtc(zone_id.unicodeString())) {
     93       // ICU doesn't have names for the UTC zones; it just says "GMT+00:00" for both
     94       // long and short names. We don't want this. The best we can do is use "UTC"
     95       // for everything (since we don't know how to say "Universal Coordinated Time" in
     96       // every language).
     97       // TODO: check CLDR doesn't actually have this somewhere.
     98       long_std = short_std = long_dst = short_dst = kUtc;
     99     } else if (zone_id.unicodeString() == pacific_apia) {
    100       // icu4c 50 doesn't know Samoa has DST yet. http://b/7955614
    101       if (long_dst.isBogus()) {
    102         long_dst = "Samoa Daylight Time";
    103       }
    104     }
    105 
    106     setStringArrayElement(env, java_row.get(), 1, long_std);
    107     setStringArrayElement(env, java_row.get(), 2, short_std);
    108     setStringArrayElement(env, java_row.get(), 3, long_dst);
    109     setStringArrayElement(env, java_row.get(), 4, short_dst);
    110   }
    111 }
    112 
    113 static JNINativeMethod gMethods[] = {
    114   NATIVE_METHOD(TimeZoneNames, fillZoneStrings, "(Ljava/lang/String;[[Ljava/lang/String;)V"),
    115 };
    116 void register_libcore_icu_TimeZoneNames(JNIEnv* env) {
    117   jniRegisterNativeMethods(env, "libcore/icu/TimeZoneNames", gMethods, NELEM(gMethods));
    118 }
    119