301 lines
10 KiB
C++
301 lines
10 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2011, International Business Machines Corporation and *
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* others. All Rights Reserved. *
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*******************************************************************************
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#include "tznames.h"
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#include "tznames_impl.h"
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#include "unicode/locid.h"
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#include "unicode/uenum.h"
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#include "cmemory.h"
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#include "cstring.h"
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#include "putilimp.h"
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#include "uassert.h"
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#include "ucln_in.h"
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#include "uhash.h"
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#include "umutex.h"
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U_NAMESPACE_BEGIN
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static const UChar gEtcPrefix[] = { 0x45, 0x74, 0x63, 0x2F }; // "Etc/"
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static const int32_t gEtcPrefixLen = 4;
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static const UChar gSystemVPrefix[] = { 0x53, 0x79, 0x73, 0x74, 0x65, 0x6D, 0x56, 0x2F }; // "SystemV/
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static const int32_t gSystemVPrefixLen = 8;
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static const UChar gRiyadh8[] = { 0x52, 0x69, 0x79, 0x61, 0x64, 0x68, 0x38 }; // "Riyadh8"
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static const int32_t gRiyadh8Len = 7;
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// TimeZoneNames object cache handling
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static UMTX gTimeZoneNamesLock = NULL;
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static UHashtable *gTimeZoneNamesCache = NULL;
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static UBool gTimeZoneNamesCacheInitialized = FALSE;
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// Access count - incremented every time up to SWEEP_INTERVAL,
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// then reset to 0
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static int32_t gAccessCount = 0;
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// Interval for calling the cache sweep function - every 100 times
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#define SWEEP_INTERVAL 100
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// Cache expiration in millisecond. When a cached entry is no
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// longer referenced and exceeding this threshold since last
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// access time, then the cache entry will be deleted by the sweep
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// function. For now, 3 minutes.
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#define CACHE_EXPIRATION 180000.0
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typedef struct TimeZoneNamesCacheEntry {
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TimeZoneNames* names;
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int32_t refCount;
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double lastAccess;
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} TimeZoneNamesCacheEntry;
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U_CDECL_BEGIN
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/**
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* Cleanup callback func
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*/
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static UBool U_CALLCONV timeZoneNames_cleanup(void)
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{
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umtx_destroy(&gTimeZoneNamesLock);
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if (gTimeZoneNamesCache != NULL) {
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uhash_close(gTimeZoneNamesCache);
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gTimeZoneNamesCache = NULL;
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}
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gTimeZoneNamesCacheInitialized = FALSE;
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return TRUE;
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}
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/**
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* Deleter for TimeZoneNamesCacheEntry
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*/
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static void U_CALLCONV
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deleteTimeZoneNamesCacheEntry(void *obj) {
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icu::TimeZoneNamesCacheEntry *entry = (icu::TimeZoneNamesCacheEntry*)obj;
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delete (icu::TimeZoneNamesImpl*) entry->names;
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uprv_free(entry);
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}
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U_CDECL_END
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/**
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* Function used for removing unreferrenced cache entries exceeding
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* the expiration time. This function must be called with in the mutex
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* block.
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*/
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static void sweepCache() {
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int32_t pos = -1;
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const UHashElement* elem;
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double now = (double)uprv_getUTCtime();
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while ((elem = uhash_nextElement(gTimeZoneNamesCache, &pos))) {
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TimeZoneNamesCacheEntry *entry = (TimeZoneNamesCacheEntry *)elem->value.pointer;
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if (entry->refCount <= 0 && (now - entry->lastAccess) > CACHE_EXPIRATION) {
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// delete this entry
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uhash_removeElement(gTimeZoneNamesCache, elem);
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}
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}
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}
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class TimeZoneNamesDelegate : public TimeZoneNames {
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public:
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TimeZoneNamesDelegate(const Locale& locale, UErrorCode& status);
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virtual ~TimeZoneNamesDelegate();
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StringEnumeration* getAvailableMetaZoneIDs(UErrorCode& status) const;
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StringEnumeration* getAvailableMetaZoneIDs(const UnicodeString& tzID, UErrorCode& status) const;
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UnicodeString& getMetaZoneID(const UnicodeString& tzID, UDate date, UnicodeString& mzID) const;
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UnicodeString& getReferenceZoneID(const UnicodeString& mzID, const char* region, UnicodeString& tzID) const;
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UnicodeString& getMetaZoneDisplayName(const UnicodeString& mzID, UTimeZoneNameType type, UnicodeString& name) const;
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UnicodeString& getTimeZoneDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UnicodeString& name) const;
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UnicodeString& getExemplarLocationName(const UnicodeString& tzID, UnicodeString& name) const;
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TimeZoneNameMatchInfo* find(const UnicodeString& text, int32_t start, uint32_t types, UErrorCode& status) const;
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private:
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TimeZoneNamesCacheEntry* fTZnamesCacheEntry;
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};
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TimeZoneNamesDelegate::TimeZoneNamesDelegate(const Locale& locale, UErrorCode& status) {
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UBool initialized;
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UMTX_CHECK(&gTimeZoneNamesLock, gTimeZoneNamesCacheInitialized, initialized);
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if (!initialized) {
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// Create empty hashtable
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umtx_lock(&gTimeZoneNamesLock);
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{
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if (!gTimeZoneNamesCacheInitialized) {
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gTimeZoneNamesCache = uhash_open(uhash_hashChars, uhash_compareChars, NULL, &status);
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if (U_SUCCESS(status)) {
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uhash_setKeyDeleter(gTimeZoneNamesCache, uprv_free);
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uhash_setValueDeleter(gTimeZoneNamesCache, deleteTimeZoneNamesCacheEntry);
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gTimeZoneNamesCacheInitialized = TRUE;
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ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONENAMES, timeZoneNames_cleanup);
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}
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}
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}
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umtx_unlock(&gTimeZoneNamesLock);
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if (U_FAILURE(status)) {
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return;
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}
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}
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// Check the cache, if not available, create new one and cache
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TimeZoneNamesCacheEntry *cacheEntry = NULL;
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umtx_lock(&gTimeZoneNamesLock);
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{
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const char *key = locale.getName();
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cacheEntry = (TimeZoneNamesCacheEntry *)uhash_get(gTimeZoneNamesCache, key);
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if (cacheEntry == NULL) {
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TimeZoneNames *tznames = NULL;
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char *newKey = NULL;
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tznames = new TimeZoneNamesImpl(locale, status);
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if (tznames == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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}
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if (U_SUCCESS(status)) {
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newKey = (char *)uprv_malloc(uprv_strlen(key) + 1);
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if (newKey == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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} else {
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uprv_strcpy(newKey, key);
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}
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}
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if (U_SUCCESS(status)) {
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cacheEntry = (TimeZoneNamesCacheEntry *)uprv_malloc(sizeof(TimeZoneNamesCacheEntry));
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if (cacheEntry == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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} else {
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cacheEntry->names = tznames;
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cacheEntry->refCount = 1;
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cacheEntry->lastAccess = (double)uprv_getUTCtime();
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uhash_put(gTimeZoneNamesCache, newKey, cacheEntry, &status);
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}
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}
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if (U_FAILURE(status)) {
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if (tznames != NULL) {
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delete tznames;
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}
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if (newKey != NULL) {
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uprv_free(newKey);
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}
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if (cacheEntry != NULL) {
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uprv_free(cacheEntry);
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}
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cacheEntry = NULL;
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}
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} else {
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// Update the reference count
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cacheEntry->refCount++;
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cacheEntry->lastAccess = (double)uprv_getUTCtime();
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}
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gAccessCount++;
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if (gAccessCount >= SWEEP_INTERVAL) {
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// sweep
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sweepCache();
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gAccessCount = 0;
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}
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}
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umtx_unlock(&gTimeZoneNamesLock);
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fTZnamesCacheEntry = cacheEntry;
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}
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TimeZoneNamesDelegate::~TimeZoneNamesDelegate() {
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umtx_lock(&gTimeZoneNamesLock);
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{
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U_ASSERT(fTZnamesCacheEntry->refCount > 0);
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// Just decrement the reference count
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fTZnamesCacheEntry->refCount--;
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}
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umtx_unlock(&gTimeZoneNamesLock);
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}
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StringEnumeration*
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TimeZoneNamesDelegate::getAvailableMetaZoneIDs(UErrorCode& status) const {
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return fTZnamesCacheEntry->names->getAvailableMetaZoneIDs(status);
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}
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StringEnumeration*
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TimeZoneNamesDelegate::getAvailableMetaZoneIDs(const UnicodeString& tzID, UErrorCode& status) const {
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return fTZnamesCacheEntry->names->getAvailableMetaZoneIDs(tzID, status);
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}
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UnicodeString&
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TimeZoneNamesDelegate::getMetaZoneID(const UnicodeString& tzID, UDate date, UnicodeString& mzID) const {
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return fTZnamesCacheEntry->names->getMetaZoneID(tzID, date, mzID);
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}
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UnicodeString&
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TimeZoneNamesDelegate::getReferenceZoneID(const UnicodeString& mzID, const char* region, UnicodeString& tzID) const {
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return fTZnamesCacheEntry->names->getReferenceZoneID(mzID, region, tzID);
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}
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UnicodeString&
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TimeZoneNamesDelegate::getMetaZoneDisplayName(const UnicodeString& mzID, UTimeZoneNameType type, UnicodeString& name) const {
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return fTZnamesCacheEntry->names->getMetaZoneDisplayName(mzID, type, name);
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}
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UnicodeString&
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TimeZoneNamesDelegate::getTimeZoneDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UnicodeString& name) const {
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return fTZnamesCacheEntry->names->getTimeZoneDisplayName(tzID, type, name);
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}
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UnicodeString&
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TimeZoneNamesDelegate::getExemplarLocationName(const UnicodeString& tzID, UnicodeString& name) const {
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return fTZnamesCacheEntry->names->getExemplarLocationName(tzID, name);
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}
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TimeZoneNameMatchInfo*
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TimeZoneNamesDelegate::find(const UnicodeString& text, int32_t start, uint32_t types, UErrorCode& status) const {
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return fTZnamesCacheEntry->names->find(text, start, types, status);
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}
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TimeZoneNames*
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TimeZoneNames::createInstance(const Locale& locale, UErrorCode& status) {
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return new TimeZoneNamesDelegate(locale, status);
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}
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UnicodeString&
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TimeZoneNames::getExemplarLocationName(const UnicodeString& tzID, UnicodeString& name) const {
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if (tzID.isEmpty() || tzID.startsWith(gEtcPrefix, gEtcPrefixLen)
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|| tzID.startsWith(gSystemVPrefix, gSystemVPrefixLen) || tzID.indexOf(gRiyadh8, gRiyadh8Len, 0) > 0) {
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name.setToBogus();
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return name;
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}
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int32_t sep = tzID.lastIndexOf((UChar)0x2F /* '/' */);
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if (sep > 0 && sep + 1 < tzID.length()) {
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name.setTo(tzID, sep + 1);
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name.findAndReplace(UnicodeString((UChar)0x5f /* _ */),
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UnicodeString((UChar)0x20 /* space */));
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} else {
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name.setToBogus();
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}
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return name;
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}
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UnicodeString&
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TimeZoneNames::getDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UDate date, UnicodeString& name) const {
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getTimeZoneDisplayName(tzID, type, name);
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if (name.isEmpty()) {
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UnicodeString mzID;
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getMetaZoneID(tzID, date, mzID);
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getMetaZoneDisplayName(mzID, type, name);
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}
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return name;
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}
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U_NAMESPACE_END
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#endif
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