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 <memory>
20
21#include "IcuUtilities.h"
22#include "JNIHelp.h"
23#include "JniConstants.h"
24#include "JniException.h"
25#include "ScopedIcuLocale.h"
26#include "ScopedJavaUnicodeString.h"
27#include "ScopedLocalRef.h"
28#include "ScopedUtfChars.h"
29#include "unicode/calendar.h"
30#include "unicode/timezone.h"
31#include "unicode/tznames.h"
32
33static bool isUtc(const icu::UnicodeString& id) {
34  static const icu::UnicodeString kEtcUct("Etc/UCT", 7, US_INV);
35  static const icu::UnicodeString kEtcUtc("Etc/UTC", 7, US_INV);
36  static const icu::UnicodeString kEtcUniversal("Etc/Universal", 13, US_INV);
37  static const icu::UnicodeString kEtcZulu("Etc/Zulu", 8, US_INV);
38
39  static const icu::UnicodeString kUct("UCT", 3, US_INV);
40  static const icu::UnicodeString kUtc("UTC", 3, US_INV);
41  static const icu::UnicodeString kUniversal("Universal", 9, US_INV);
42  static const icu::UnicodeString kZulu("Zulu", 4, US_INV);
43
44  return id == kEtcUct || id == kEtcUtc || id == kEtcUniversal || id == kEtcZulu ||
45      id == kUct || id == kUtc || id == kUniversal || id == kZulu;
46}
47
48static bool setStringArrayElement(JNIEnv* env, jobjectArray array, int i, const icu::UnicodeString& s) {
49  // Fill in whatever we got. We don't use the display names if they're "GMT[+-]xx:xx"
50  // because icu4c doesn't use the up-to-date time zone transition data, so it gets these
51  // wrong. TimeZone.getDisplayName creates accurate names on demand.
52  // TODO: investigate whether it's worth doing that work once in the Java wrapper instead of on-demand.
53  static const icu::UnicodeString kGmt("GMT", 3, US_INV);
54  if (!s.isBogus() && !s.startsWith(kGmt)) {
55    ScopedLocalRef<jstring> javaString(env, env->NewString(s.getBuffer(), s.length()));
56    if (javaString.get() == NULL) {
57      return false;
58    }
59    env->SetObjectArrayElement(array, i, javaString.get());
60  }
61  return true;
62}
63
64static void TimeZoneNames_fillZoneStrings(JNIEnv* env, jclass, jstring javaLocaleName, jobjectArray result) {
65  ScopedIcuLocale icuLocale(env, javaLocaleName);
66  if (!icuLocale.valid()) {
67    return;
68  }
69
70  UErrorCode status = U_ZERO_ERROR;
71  std::unique_ptr<icu::TimeZoneNames> names(icu::TimeZoneNames::createInstance(icuLocale.locale(), status));
72  if (maybeThrowIcuException(env, "TimeZoneNames::createInstance", status)) {
73    return;
74  }
75
76  const UDate now(icu::Calendar::getNow());
77
78  static const icu::UnicodeString kUtc("UTC", 3, US_INV);
79
80  size_t id_count = env->GetArrayLength(result);
81  for (size_t i = 0; i < id_count; ++i) {
82    ScopedLocalRef<jobjectArray> java_row(env,
83                                          reinterpret_cast<jobjectArray>(env->GetObjectArrayElement(result, i)));
84    ScopedLocalRef<jstring> java_zone_id(env,
85                                         reinterpret_cast<jstring>(env->GetObjectArrayElement(java_row.get(), 0)));
86    ScopedJavaUnicodeString zone_id(env, java_zone_id.get());
87    if (!zone_id.valid()) {
88      return;
89    }
90
91    icu::UnicodeString long_std;
92    names->getDisplayName(zone_id.unicodeString(), UTZNM_LONG_STANDARD, now, long_std);
93    icu::UnicodeString short_std;
94    names->getDisplayName(zone_id.unicodeString(), UTZNM_SHORT_STANDARD, now, short_std);
95    icu::UnicodeString long_dst;
96    names->getDisplayName(zone_id.unicodeString(), UTZNM_LONG_DAYLIGHT, now, long_dst);
97    icu::UnicodeString short_dst;
98    names->getDisplayName(zone_id.unicodeString(), UTZNM_SHORT_DAYLIGHT, now, short_dst);
99
100    if (isUtc(zone_id.unicodeString())) {
101      // ICU doesn't have names for the UTC zones; it just says "GMT+00:00" for both
102      // long and short names. We don't want this. The best we can do is use "UTC"
103      // for everything (since we don't know how to say "Universal Coordinated Time" in
104      // every language).
105      // TODO: check CLDR doesn't actually have this somewhere.
106      long_std = short_std = long_dst = short_dst = kUtc;
107    }
108
109    bool okay =
110        setStringArrayElement(env, java_row.get(), 1, long_std) &&
111        setStringArrayElement(env, java_row.get(), 2, short_std) &&
112        setStringArrayElement(env, java_row.get(), 3, long_dst) &&
113        setStringArrayElement(env, java_row.get(), 4, short_dst);
114    if (!okay) {
115      return;
116    }
117  }
118}
119
120static jstring TimeZoneNames_getExemplarLocation(JNIEnv* env, jclass, jstring javaLocaleName, jstring javaTz) {
121  ScopedIcuLocale icuLocale(env, javaLocaleName);
122  if (!icuLocale.valid()) {
123    return NULL;
124  }
125
126  UErrorCode status = U_ZERO_ERROR;
127  std::unique_ptr<icu::TimeZoneNames> names(icu::TimeZoneNames::createInstance(icuLocale.locale(), status));
128  if (maybeThrowIcuException(env, "TimeZoneNames::createInstance", status)) {
129    return NULL;
130  }
131
132  ScopedJavaUnicodeString tz(env, javaTz);
133  if (!tz.valid()) {
134    return NULL;
135  }
136
137  icu::UnicodeString s;
138  const UDate now(icu::Calendar::getNow());
139  names->getDisplayName(tz.unicodeString(), UTZNM_EXEMPLAR_LOCATION, now, s);
140  return env->NewString(s.getBuffer(), s.length());
141}
142
143static JNINativeMethod gMethods[] = {
144  NATIVE_METHOD(TimeZoneNames, fillZoneStrings, "(Ljava/lang/String;[[Ljava/lang/String;)V"),
145  NATIVE_METHOD(TimeZoneNames, getExemplarLocation, "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;"),
146};
147void register_libcore_icu_TimeZoneNames(JNIEnv* env) {
148  jniRegisterNativeMethods(env, "libcore/icu/TimeZoneNames", gMethods, NELEM(gMethods));
149}
150