1098 lines
34 KiB
C++
1098 lines
34 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 1997-2001, 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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* File TIMEZONE.CPP
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*
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* Modification History:
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*
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* Date Name Description
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* 12/05/96 clhuang Creation.
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* 04/21/97 aliu General clean-up and bug fixing.
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* 05/08/97 aliu Fixed Hashtable code per code review.
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* 07/09/97 helena Changed createInstance to createDefault.
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* 07/29/97 aliu Updated with all-new list of 96 UNIX-derived
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* TimeZones. Changed mechanism to load from static
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* array rather than resource bundle.
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* 07/07/1998 srl Bugfixes from the Java side: UTC GMT CAT NST
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* Added getDisplayName API
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* going to add custom parsing.
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*
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* ISSUES:
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* - should getDisplayName cache something?
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* - should custom time zones be cached? [probably]
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* 08/10/98 stephen Brought getDisplayName() API in-line w/ conventions
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* 08/19/98 stephen Changed createTimeZone() to never return 0
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* 09/02/98 stephen Added getOffset(monthLen) and hasSameRules()
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* 09/15/98 stephen Added getStaticClassID()
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* 02/22/99 stephen Removed character literals for EBCDIC safety
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* 05/04/99 stephen Changed initDefault() for Mutex issues
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* 07/12/99 helena HPUX 11 CC Port.
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* 12/03/99 aliu Moved data out of static table into icudata.dll.
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* Substantial rewrite of zone lookup, default zone, and
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* available IDs code. Misc. cleanup.
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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 "unicode/simpletz.h"
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#include "unicode/smpdtfmt.h"
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#include "unicode/calendar.h"
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#include "mutex.h"
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#include "unicode/udata.h"
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#include "tzdat.h"
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#include "ucln_in.h"
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#include "cstring.h"
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#include "cmemory.h"
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#include "unicode/strenum.h"
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// static initialization
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static const UChar GMT_ID[] = {0x47, 0x4D, 0x54, 0x00}; /* "GMT" */
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static const int32_t GMT_ID_LENGTH = 3;
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static const UChar CUSTOM_ID[] =
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{
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0x43, 0x75, 0x73, 0x74, 0x6F, 0x6D, 0x00 /* "Custom" */
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};
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// See header file for documentation of the following
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static const TZHeader * DATA = NULL;
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static const uint32_t* INDEX_BY_ID = 0;
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static const OffsetIndex* INDEX_BY_OFFSET = 0;
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static const CountryIndex* INDEX_BY_COUNTRY = 0;
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static UDataMemory* UDATA_POINTER = 0;
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static UMTX LOCK;
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static UBool DATA_LOADED = FALSE;
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static void loadZoneData(void);
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U_NAMESPACE_BEGIN
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static TimeZone* DEFAULT_ZONE = NULL;
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static TimeZone* _GMT = NULL; // cf. TimeZone::GMT
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static UnicodeString* ZONE_IDS = 0;
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const char TimeZone::fgClassID = 0; // Value is irrelevant
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static const TZEquivalencyGroup* lookupEquivalencyGroup(const UnicodeString& id);
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U_NAMESPACE_END
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/**
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* udata callback to verify the zone data.
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*/
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U_CDECL_BEGIN
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static UBool U_CALLCONV
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isTimeZoneDataAcceptable(void * /*context*/,
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const char * /*type*/, const char * /*name*/,
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const UDataInfo *pInfo) {
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return
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pInfo->size >= sizeof(UDataInfo) &&
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pInfo->isBigEndian == U_IS_BIG_ENDIAN &&
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pInfo->charsetFamily == U_CHARSET_FAMILY &&
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pInfo->dataFormat[0] == TZ_SIG_0 &&
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pInfo->dataFormat[1] == TZ_SIG_1 &&
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pInfo->dataFormat[2] == TZ_SIG_2 &&
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pInfo->dataFormat[3] == TZ_SIG_3 &&
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pInfo->formatVersion[0] == TZ_FORMAT_VERSION;
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}
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U_CDECL_END
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UBool timeZone_cleanup()
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{
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U_NAMESPACE_USE
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DATA = NULL;
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INDEX_BY_ID = NULL;
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INDEX_BY_OFFSET = NULL;
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INDEX_BY_COUNTRY = NULL;
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if (ZONE_IDS) {
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delete []ZONE_IDS;
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ZONE_IDS = NULL;
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}
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if (UDATA_POINTER) {
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udata_close(UDATA_POINTER);
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UDATA_POINTER = NULL;
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}
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if (LOCK) {
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umtx_destroy(&LOCK);
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LOCK = NULL;
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}
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if (_GMT) {
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delete _GMT;
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_GMT = NULL;
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}
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if (DEFAULT_ZONE) {
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delete DEFAULT_ZONE;
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DEFAULT_ZONE = NULL;
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}
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DATA_LOADED = FALSE;
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return TRUE;
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}
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/**
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* Attempt to load the system zone data from icudata.dll (or its
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* equivalent). After this call returns DATA_LOADED will be true.
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* DATA itself will be non-null if the load succeeded; otherwise it
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* will be null. This call does nothing if the load has already
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* happened or or if it happens in another thread concurrently before
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* we can get there.
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*
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* After this call, we are guaranteed that DATA_LOADED is true. We
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* are _not_ guaranteed that DATA will be nonzero. If it is nonzero,
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* we are guaranteed that all associated data structures are
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* initialized.
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*/
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static void loadZoneData() {
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U_NAMESPACE_USE
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if (DATA_LOADED) {
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return;
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}
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// Cleanup handles both _GMT and the UDataMemory-based statics
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ucln_i18n_registerCleanup();
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// Initialize _GMT independently; it should be valid even if we
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// can't load the time zone UDataMemory.
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TimeZone* gmt = new SimpleTimeZone(0, UnicodeString(GMT_ID, GMT_ID_LENGTH));
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umtx_lock(&LOCK);
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if (_GMT == NULL) {
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_GMT = gmt;
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gmt = NULL;
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}
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umtx_unlock(&LOCK);
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delete gmt;
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// Open a data memory object, to be closed either later in this
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// function or in timeZone_cleanup(). Purify (etc.) may
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// mistakenly report this as a leak.
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UErrorCode status = U_ZERO_ERROR;
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UDataMemory* data = udata_openChoice(0, TZ_DATA_TYPE, TZ_DATA_NAME,
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(UDataMemoryIsAcceptable*)isTimeZoneDataAcceptable, 0, &status);
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if (U_FAILURE(status)) {
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return;
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}
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TZHeader* tzh = (TZHeader*)udata_getMemory(data);
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// Result guaranteed to be nonzero if 'data' is nonzero
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const uint32_t* index_by_id =
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(const uint32_t*)((int8_t*)tzh + tzh->nameIndexDelta);
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const OffsetIndex* index_by_offset =
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(const OffsetIndex*)((int8_t*)tzh + tzh->offsetIndexDelta);
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const CountryIndex* index_by_country =
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(const CountryIndex*)((int8_t*)tzh + tzh->countryIndexDelta);
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// Construct the available IDs array. The ordering
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// of this array conforms to the ordering of the
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// index by name table.
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UnicodeString* zone_ids = new UnicodeString[tzh->count];
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// Find start of name table, and walk through it
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// linearly. If you're wondering why we don't use
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// the INDEX_BY_ID, it's because that indexes the
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// zone objects, not the name table. The name
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// table is unindexed.
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const char* name = (const char*)tzh + tzh->nameTableDelta;
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int32_t length;
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for (uint32_t i=0; i<tzh->count; ++i) {
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zone_ids[i] = UnicodeString(name, ""); // invariant converter
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length = zone_ids[i].length(); // add a NUL but don't count it so that
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zone_ids[i].append((UChar)0); // getBuffer() gets a terminated string
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zone_ids[i].truncate(length);
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name += uprv_strlen(name) + 1;
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}
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// Keep mutexed operations as short as possible by doing all
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// computations first, then doing pointer copies within the mutex.
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umtx_lock(&LOCK);
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if (!DATA_LOADED) {
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DATA = tzh;
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INDEX_BY_ID = index_by_id;
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INDEX_BY_OFFSET = index_by_offset;
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INDEX_BY_COUNTRY = index_by_country;
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UDATA_POINTER = data;
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ZONE_IDS = zone_ids;
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data = NULL;
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DATA_LOADED = TRUE;
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}
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umtx_unlock(&LOCK);
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// If another thread initialized the statics first, then delete
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// our unused data.
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if (data != NULL) {
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udata_close(data);
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delete[] zone_ids;
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}
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}
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// -------------------------------------
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U_NAMESPACE_BEGIN
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const TimeZone*
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TimeZone::getGMT(void)
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{
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if (!DATA_LOADED) {
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loadZoneData();
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}
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return _GMT;
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}
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// *****************************************************************************
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// class TimeZone
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// *****************************************************************************
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TimeZone::TimeZone()
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: UObject(), fID()
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{
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}
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// -------------------------------------
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TimeZone::TimeZone(const UnicodeString &id)
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: UObject(), fID(id)
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{
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}
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// -------------------------------------
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TimeZone::~TimeZone()
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{
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}
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// -------------------------------------
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TimeZone::TimeZone(const TimeZone &source)
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: UObject(source), fID(source.fID)
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{
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}
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// -------------------------------------
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TimeZone &
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TimeZone::operator=(const TimeZone &right)
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{
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if (this != &right) fID = right.fID;
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return *this;
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}
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// -------------------------------------
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UBool
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TimeZone::operator==(const TimeZone& that) const
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{
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return getDynamicClassID() == that.getDynamicClassID() &&
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fID == that.fID;
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}
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// -------------------------------------
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TimeZone*
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TimeZone::createTimeZone(const UnicodeString& ID)
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{
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/* We first try to lookup the zone ID in our system list. If this
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* fails, we try to parse it as a custom string GMT[+-]hh:mm. If
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* all else fails, we return GMT, which is probably not what the
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* user wants, but at least is a functioning TimeZone object.
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*/
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TimeZone* result = 0;
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if (!DATA_LOADED) {
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loadZoneData();
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}
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if (DATA != 0) {
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result = createSystemTimeZone(ID);
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}
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if (result == 0) {
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result = createCustomTimeZone(ID);
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}
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if (result == 0) {
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result = getGMT()->clone();
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}
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return result;
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}
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/**
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* Lookup the given name in our system zone table. If found,
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* instantiate a new zone of that name and return it. If not
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* found, return 0.
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*/
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TimeZone*
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TimeZone::createSystemTimeZone(const UnicodeString& name) {
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if (0 == DATA) {
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return 0;
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}
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const TZEquivalencyGroup *eg = lookupEquivalencyGroup(name);
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if (eg != 0) {
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return eg->isDST ?
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new SimpleTimeZone(eg->u.d.zone, name) :
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new SimpleTimeZone(eg->u.s.zone, name);
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}
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return 0;
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}
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/**
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* Lookup the given ID in the system time zone equivalency group table.
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* Return a pointer to the equivalency group, or NULL if not found.
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* DATA MUST BE INITIALIZED AND NON-NULL.
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*/
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static const TZEquivalencyGroup*
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lookupEquivalencyGroup(const UnicodeString& id) {
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// Perform a binary search. Possible optimization: Unroll the
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// search. Not worth it given the small number of zones (416 in
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// 1999j).
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uint32_t low = 0;
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uint32_t high = DATA->count;
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while (high > low) {
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// Invariant: match, if present, must be in the range [low,
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// high).
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uint32_t i = (low + high) / 2;
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int8_t c = id.compare(ZONE_IDS[i]);
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if (c == 0) {
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return (TZEquivalencyGroup*) ((int8_t*)DATA + INDEX_BY_ID[i]);
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} else if (c < 0) {
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high = i;
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} else {
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low = i + 1;
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}
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}
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return 0;
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}
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// -------------------------------------
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void
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TimeZone::initDefault()
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{
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if (!DATA_LOADED) {
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loadZoneData();
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}
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// This function is called by createDefault() to initialize
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// DEFAULT_ZONE from the system default time zone. If
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// DEFAULT_ZONE is already filled in, we obviously don't have to
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// do anything.
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if (DEFAULT_ZONE != NULL) {
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return;
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}
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// We access system timezone data through TPlatformUtilities,
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// including tzset(), timezone, and tzname[].
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int32_t rawOffset = 0;
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const char *hostID;
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// First, try to create a system timezone, based
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// on the string ID in tzname[0].
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{
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// NOTE: Global mutex here; TimeZone mutex above
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// mutexed to avoid threading issues in the platform fcns.
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// Some of the locale/timezone OS functions may not be thread safe,
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// so the intent is that any setting from anywhere within ICU
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// happens with the ICU global mutex held.
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Mutex lock;
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uprv_tzset(); // Initialize tz... system data
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// get the timezone ID from the host.
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hostID = uprv_tzname(0);
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// Invert sign because UNIX semantics are backwards
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rawOffset = uprv_timezone() * -U_MILLIS_PER_SECOND;
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}
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// Try to create a system zone with the given ID. This
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// _always fails on Windows_ because Windows returns a
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// non-standard localized zone name, e.g., "Pacific
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// Standard Time" on U.S. systems set to PST. One way to
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// fix this is to add a Windows-specific mapping table,
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// but that means we'd have to do so for every locale. A
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// better way is to use the offset and find a
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// corresponding zone, which is what we do below.
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TimeZone* default_zone = createSystemTimeZone(hostID);
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// If we couldn't get the time zone ID from the host, use
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// the default host timezone offset. Further refinements
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// to this include querying the host to determine if DST
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// is in use or not and possibly using the host locale to
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// select from multiple zones at a the same offset. We
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// don't do any of this now, but we could easily add this.
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if (default_zone == 0 && DATA != 0) {
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// Use the designated default in the time zone list that has the
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// appropriate GMT offset, if there is one.
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const OffsetIndex* index = INDEX_BY_OFFSET;
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for (;;) {
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if (index->gmtOffset > rawOffset) {
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// Went past our desired offset; no match found
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break;
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}
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if (index->gmtOffset == rawOffset) {
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// Found our desired offset
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DEFAULT_ZONE = createTimeZone(ZONE_IDS[index->defaultZone]);
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break;
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}
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// Compute the position of the next entry. If the delta value
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// in this entry is zero, then there is no next entry.
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uint16_t delta = index->nextEntryDelta;
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if (delta == 0) {
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break;
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}
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index = (const OffsetIndex*)((int8_t*)index + delta);
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}
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}
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// If we _still_ don't have a time zone, use GMT. This
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// can only happen if the raw offset returned by
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// uprv_timezone() does not correspond to any system zone.
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if (default_zone == NULL) {
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default_zone = getGMT()->clone();
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}
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// If DEFAULT_ZONE is still NULL, set it up.
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umtx_lock(&LOCK);
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if (DEFAULT_ZONE == NULL) {
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DEFAULT_ZONE = default_zone;
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default_zone = NULL;
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}
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umtx_unlock(&LOCK);
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delete default_zone;
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}
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// -------------------------------------
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TimeZone*
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TimeZone::createDefault()
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{
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initDefault(); // After this call DEFAULT_ZONE is not NULL
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Mutex lock(&LOCK); // In case adoptDefault is called
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return DEFAULT_ZONE->clone();
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}
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// -------------------------------------
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void
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TimeZone::adoptDefault(TimeZone* zone)
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{
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if (zone != NULL)
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{
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TimeZone* old = NULL;
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umtx_lock(&LOCK);
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old = DEFAULT_ZONE;
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DEFAULT_ZONE = zone;
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umtx_unlock(&LOCK);
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delete old;
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}
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}
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// -------------------------------------
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void
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TimeZone::setDefault(const TimeZone& zone)
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{
|
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adoptDefault(zone.clone());
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}
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// -------------------------------------
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|
|
// New available IDs API as of ICU 2.4. Uses StringEnumeration API.
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|
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class TZEnumeration : public StringEnumeration {
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|
// Map into to ZONE_IDS. Our results are ZONE_IDS[map[i]] for
|
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// i=0..len-1. If map==NULL then our results are ZONE_IDS[i]
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// for i=0..len-1. Len will be zero iff the zone data could
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// not be loaded.
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int32_t* map;
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int32_t len;
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|
int32_t pos;
|
|
void* _bufp;
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int32_t _buflen;
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|
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public:
|
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TZEnumeration() {
|
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map = NULL;
|
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_bufp = NULL;
|
|
len = pos = _buflen = 0;
|
|
if (!DATA_LOADED) {
|
|
loadZoneData();
|
|
}
|
|
if (DATA != NULL) {
|
|
len = DATA->count;
|
|
}
|
|
}
|
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|
|
TZEnumeration(int32_t rawOffset) {
|
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map = NULL;
|
|
_bufp = NULL;
|
|
len = pos = _buflen = 0;
|
|
if (!DATA_LOADED) {
|
|
loadZoneData();
|
|
}
|
|
if (DATA == NULL) return;
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|
|
|
/* The offset index table is a table of variable-sized objects.
|
|
* Each entry has an offset to the next entry; the last entry has
|
|
* a next entry offset of zero.
|
|
*
|
|
* The entries are sorted in ascending numerical order of GMT
|
|
* offset. Each entry lists all the system zones at that offset,
|
|
* in lexicographic order of ID. Note that this ordering is
|
|
* somewhat significant in that the _first_ zone in each list is
|
|
* what will be chosen as the default under certain fallback
|
|
* conditions. We currently just let that be the
|
|
* lexicographically first zone, but we could also adjust the list
|
|
* to pick which zone was first for this situation -- probably not
|
|
* worth the trouble, except for the fact that this fallback is
|
|
* _always_ used to determine the default zone on Windows.
|
|
*
|
|
* The list of zones is actually just a list of integers, from
|
|
* 0..n-1, where n is the total number of system zones. The
|
|
* numbering corresponds exactly to the ordering of ZONE_IDS.
|
|
*/
|
|
const OffsetIndex* index = INDEX_BY_OFFSET;
|
|
|
|
for (;;) {
|
|
if (index->gmtOffset > rawOffset) {
|
|
// Went past our desired offset; no match found
|
|
break;
|
|
}
|
|
if (index->gmtOffset == rawOffset) {
|
|
// Found our desired offset
|
|
map = (int32_t*)uprv_malloc(sizeof(int32_t) * index->count);
|
|
if (map != NULL) {
|
|
len = index->count;
|
|
const uint16_t* zoneNumberArray = &(index->zoneNumber);
|
|
for (uint16_t i=0; i<len; ++i) {
|
|
map[i] = zoneNumberArray[i];
|
|
}
|
|
}
|
|
}
|
|
// Compute the position of the next entry. If the delta value
|
|
// in this entry is zero, then there is no next entry.
|
|
uint16_t delta = index->nextEntryDelta;
|
|
if (delta == 0) {
|
|
break;
|
|
}
|
|
index = (const OffsetIndex*)((int8_t*)index + delta);
|
|
}
|
|
}
|
|
|
|
TZEnumeration(const char* country) {
|
|
map = NULL;
|
|
_bufp = NULL;
|
|
len = pos = _buflen = 0;
|
|
if (!DATA_LOADED) {
|
|
loadZoneData();
|
|
}
|
|
if (DATA == NULL) return;
|
|
|
|
/* The country index table is a table of variable-sized objects.
|
|
* Each entry has an offset to the next entry; the last entry has
|
|
* a next entry offset of zero.
|
|
*
|
|
* The entries are sorted in ascending numerical order of intcode.
|
|
* This is an integer representation of the 2-letter ISO 3166
|
|
* country code. It is computed as (c1-'A')*32 + (c0-'A'), where
|
|
* the country code is c1 c0, with 'A' <= ci <= 'Z'.
|
|
*
|
|
* The list of zones is a list of integers, from 0..n-1, where n
|
|
* is the total number of system zones. The numbering corresponds
|
|
* exactly to the ordering of ZONE_IDS.
|
|
*/
|
|
const CountryIndex* index = INDEX_BY_COUNTRY;
|
|
|
|
uint16_t intcode = 0;
|
|
if (country != NULL && *country != 0) {
|
|
intcode = (uint16_t)((U_UPPER_ORDINAL(country[0]) << 5)
|
|
+ U_UPPER_ORDINAL(country[1]));
|
|
}
|
|
|
|
for (;;) {
|
|
if (index->intcode > intcode) {
|
|
// Went past our desired country; no match found
|
|
break;
|
|
}
|
|
if (index->intcode == intcode) {
|
|
// Found our desired country
|
|
map = (int32_t*)uprv_malloc(sizeof(int32_t) * index->count);
|
|
if (map != NULL) {
|
|
len = index->count;
|
|
const uint16_t* zoneNumberArray = &(index->zoneNumber);
|
|
for (uint16_t i=0; i<len; ++i) {
|
|
map[i] = zoneNumberArray[i];
|
|
}
|
|
}
|
|
}
|
|
// Compute the position of the next entry. If the delta value
|
|
// in this entry is zero, then there is no next entry.
|
|
uint16_t delta = index->nextEntryDelta;
|
|
if (delta == 0) {
|
|
break;
|
|
}
|
|
index = (const CountryIndex*)((int8_t*)index + delta);
|
|
}
|
|
}
|
|
|
|
virtual ~TZEnumeration() {
|
|
uprv_free(map);
|
|
uprv_free(_bufp);
|
|
}
|
|
|
|
int32_t count(UErrorCode& status) const {
|
|
return U_FAILURE(status) ? 0 : len;
|
|
}
|
|
|
|
const char* next(int32_t* resultLength, UErrorCode& status) {
|
|
// TODO: Later a subclass of StringEnumeration will be available
|
|
// that implements next() and unext() in terms of snext().
|
|
// Inherit from that class when available and remove this method
|
|
// (and its declaration).
|
|
const UnicodeString* us = snext(status);
|
|
int32_t newlen;
|
|
if (us != NULL && ensureCapacity((newlen=us->length()) + 1)) {
|
|
us->extract(0, INT32_MAX, (char*) _bufp, "");
|
|
if (resultLength) {
|
|
resultLength[0] = newlen;
|
|
}
|
|
return (const char*)_bufp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
const UChar* unext(int32_t* resultLength, UErrorCode& status) {
|
|
const UnicodeString* us = snext(status);
|
|
if (us != NULL) {
|
|
if (resultLength) {
|
|
resultLength[0] = us->length();
|
|
}
|
|
// TimeZone terminates the ID strings when it builds them
|
|
return us->getBuffer();
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
const UnicodeString* snext(UErrorCode& status) {
|
|
if (U_SUCCESS(status) && pos < len) {
|
|
return (map != NULL) ?
|
|
&ZONE_IDS[map[pos++]] : &ZONE_IDS[pos++];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void reset(UErrorCode& status) {
|
|
pos = 0;
|
|
}
|
|
|
|
public:
|
|
virtual UClassID getDynamicClassID(void) const { return getStaticClassID(); }
|
|
static UClassID getStaticClassID(void) { return (UClassID)&fgClassID; }
|
|
private:
|
|
static const char fgClassID;
|
|
|
|
private:
|
|
/**
|
|
* Guarantee that _bufp is allocated to include _buflen characters
|
|
* where _buflen >= minlen. Return TRUE if successful, FALSE
|
|
* otherwise.
|
|
*/
|
|
UBool ensureCapacity(int32_t minlen) {
|
|
if (_bufp != NULL && _buflen >= minlen) {
|
|
return TRUE;
|
|
}
|
|
_buflen = minlen + 8; // add 8 to prevent thrashing
|
|
_bufp = (_bufp == NULL) ? uprv_malloc(_buflen)
|
|
: uprv_realloc(_bufp, _buflen);
|
|
return _bufp != NULL;
|
|
}
|
|
};
|
|
|
|
const char TZEnumeration::fgClassID = '\0';
|
|
|
|
StringEnumeration*
|
|
TimeZone::createEnumeration() {
|
|
return new TZEnumeration();
|
|
}
|
|
|
|
StringEnumeration*
|
|
TimeZone::createEnumeration(int32_t rawOffset) {
|
|
return new TZEnumeration(rawOffset);
|
|
}
|
|
|
|
StringEnumeration*
|
|
TimeZone::createEnumeration(const char* country) {
|
|
return new TZEnumeration(country);
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
// TODO: #ifdef out this code after 8-Nov-2003
|
|
// #ifdef ICU_TIMEZONE_USE_DEPRECATES
|
|
|
|
const UnicodeString**
|
|
TimeZone::createAvailableIDs(int32_t rawOffset, int32_t& numIDs)
|
|
{
|
|
// We are creating a new array to existing UnicodeString pointers.
|
|
// The caller will delete the array when done, but not the pointers
|
|
// in the array.
|
|
|
|
if (!DATA_LOADED) {
|
|
loadZoneData();
|
|
}
|
|
if (0 == DATA) {
|
|
numIDs = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* The offset index table is a table of variable-sized objects.
|
|
* Each entry has an offset to the next entry; the last entry has
|
|
* a next entry offset of zero.
|
|
*
|
|
* The entries are sorted in ascending numerical order of GMT
|
|
* offset. Each entry lists all the system zones at that offset,
|
|
* in lexicographic order of ID. Note that this ordering is
|
|
* somewhat significant in that the _first_ zone in each list is
|
|
* what will be chosen as the default under certain fallback
|
|
* conditions. We currently just let that be the
|
|
* lexicographically first zone, but we could also adjust the list
|
|
* to pick which zone was first for this situation -- probably not
|
|
* worth the trouble, except for the fact that this fallback is
|
|
* _always_ used to determine the default zone on Windows.
|
|
*
|
|
* The list of zones is actually just a list of integers, from
|
|
* 0..n-1, where n is the total number of system zones. The
|
|
* numbering corresponds exactly to the ordering of ZONE_IDS.
|
|
*/
|
|
const OffsetIndex* index = INDEX_BY_OFFSET;
|
|
|
|
for (;;) {
|
|
if (index->gmtOffset > rawOffset) {
|
|
// Went past our desired offset; no match found
|
|
break;
|
|
}
|
|
if (index->gmtOffset == rawOffset) {
|
|
// Found our desired offset
|
|
const UnicodeString** result =
|
|
(const UnicodeString**)uprv_malloc(index->count * sizeof(UnicodeString *));
|
|
const uint16_t* zoneNumberArray = &(index->zoneNumber);
|
|
for (uint16_t i=0; i<index->count; ++i) {
|
|
// Pointer assignment - use existing UnicodeString object!
|
|
// Don't create a new UnicodeString on the heap here!
|
|
result[i] = &ZONE_IDS[zoneNumberArray[i]];
|
|
}
|
|
numIDs = index->count;
|
|
return result;
|
|
}
|
|
// Compute the position of the next entry. If the delta value
|
|
// in this entry is zero, then there is no next entry.
|
|
uint16_t delta = index->nextEntryDelta;
|
|
if (delta == 0) {
|
|
break;
|
|
}
|
|
index = (const OffsetIndex*)((int8_t*)index + delta);
|
|
}
|
|
|
|
numIDs = 0;
|
|
return 0;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
const UnicodeString**
|
|
TimeZone::createAvailableIDs(const char* country, int32_t& numIDs) {
|
|
|
|
// We are creating a new array to existing UnicodeString pointers.
|
|
// The caller will delete the array when done, but not the pointers
|
|
// in the array.
|
|
|
|
if (!DATA_LOADED) {
|
|
loadZoneData();
|
|
}
|
|
if (0 == DATA) {
|
|
numIDs = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* The country index table is a table of variable-sized objects.
|
|
* Each entry has an offset to the next entry; the last entry has
|
|
* a next entry offset of zero.
|
|
*
|
|
* The entries are sorted in ascending numerical order of intcode.
|
|
* This is an integer representation of the 2-letter ISO 3166
|
|
* country code. It is computed as (c1-'A')*32 + (c0-'A'), where
|
|
* the country code is c1 c0, with 'A' <= ci <= 'Z'.
|
|
*
|
|
* The list of zones is a list of integers, from 0..n-1, where n
|
|
* is the total number of system zones. The numbering corresponds
|
|
* exactly to the ordering of ZONE_IDS.
|
|
*/
|
|
const CountryIndex* index = INDEX_BY_COUNTRY;
|
|
|
|
uint16_t intcode = 0;
|
|
if (country != NULL && *country != 0) {
|
|
intcode = (uint16_t)((U_UPPER_ORDINAL(country[0]) << 5)
|
|
+ U_UPPER_ORDINAL(country[1]));
|
|
}
|
|
|
|
for (;;) {
|
|
if (index->intcode > intcode) {
|
|
// Went past our desired country; no match found
|
|
break;
|
|
}
|
|
if (index->intcode == intcode) {
|
|
// Found our desired country
|
|
const UnicodeString** result =
|
|
(const UnicodeString**)uprv_malloc(index->count * sizeof(UnicodeString *));
|
|
const uint16_t* zoneNumberArray = &(index->zoneNumber);
|
|
for (uint16_t i=0; i<index->count; ++i) {
|
|
// Pointer assignment - use existing UnicodeString object!
|
|
// Don't create a new UnicodeString on the heap here!
|
|
result[i] = &ZONE_IDS[zoneNumberArray[i]];
|
|
}
|
|
numIDs = index->count;
|
|
return result;
|
|
}
|
|
// Compute the position of the next entry. If the delta value
|
|
// in this entry is zero, then there is no next entry.
|
|
uint16_t delta = index->nextEntryDelta;
|
|
if (delta == 0) {
|
|
break;
|
|
}
|
|
index = (const CountryIndex*)((int8_t*)index + delta);
|
|
}
|
|
|
|
numIDs = 0;
|
|
return 0;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
const UnicodeString**
|
|
TimeZone::createAvailableIDs(int32_t& numIDs)
|
|
{
|
|
// We are creating a new array to existing UnicodeString pointers.
|
|
// The caller will delete the array when done, but not the pointers
|
|
// in the array.
|
|
//
|
|
// This is really unnecessary, given the fact that we have an
|
|
// array of the IDs already constructed, and we could just return
|
|
// that. However, that would be a breaking API change, and some
|
|
// callers familiar with the original API might try to delete it.
|
|
|
|
if (!DATA_LOADED) {
|
|
loadZoneData();
|
|
}
|
|
if (0 == DATA) {
|
|
numIDs = 0;
|
|
return 0;
|
|
}
|
|
|
|
const UnicodeString** result =
|
|
(const UnicodeString** )uprv_malloc(DATA->count * sizeof(UnicodeString *));
|
|
|
|
// Create a list of pointers to each and every zone ID
|
|
for (uint32_t i=0; i<DATA->count; ++i) {
|
|
// Pointer assignment - use existing UnicodeString object!
|
|
// Don't create a new UnicodeString on the heap here!
|
|
result[i] = &ZONE_IDS[i];
|
|
}
|
|
|
|
numIDs = DATA->count;
|
|
return result;
|
|
}
|
|
|
|
// ICU_TIMEZONE_USE_DEPRECATES
|
|
// #endif
|
|
// see above
|
|
|
|
// ---------------------------------------
|
|
|
|
int32_t
|
|
TimeZone::countEquivalentIDs(const UnicodeString& id) {
|
|
if (!DATA_LOADED) {
|
|
loadZoneData();
|
|
}
|
|
if (0 == DATA) {
|
|
return 0;
|
|
}
|
|
const TZEquivalencyGroup *eg = lookupEquivalencyGroup(id);
|
|
return (eg != 0) ? (eg->isDST ? eg->u.d.count : eg->u.s.count) : 0;
|
|
}
|
|
|
|
// ---------------------------------------
|
|
|
|
const UnicodeString
|
|
TimeZone::getEquivalentID(const UnicodeString& id, int32_t index) {
|
|
if (!DATA_LOADED) {
|
|
loadZoneData();
|
|
}
|
|
if (0 != DATA) {
|
|
const TZEquivalencyGroup *eg = lookupEquivalencyGroup(id);
|
|
if (eg != 0) {
|
|
const uint16_t *p = eg->isDST ? &eg->u.d.count : &eg->u.s.count;
|
|
if (index >= 0 && index < *p) {
|
|
return ZONE_IDS[p[index+1]];
|
|
}
|
|
}
|
|
}
|
|
return UnicodeString();
|
|
}
|
|
|
|
// ---------------------------------------
|
|
|
|
|
|
UnicodeString&
|
|
TimeZone::getDisplayName(UnicodeString& result) const
|
|
{
|
|
return getDisplayName(FALSE,LONG,Locale::getDefault(), result);
|
|
}
|
|
|
|
UnicodeString&
|
|
TimeZone::getDisplayName(const Locale& locale, UnicodeString& result) const
|
|
{
|
|
return getDisplayName(FALSE, LONG, locale, result);
|
|
}
|
|
|
|
UnicodeString&
|
|
TimeZone::getDisplayName(UBool daylight, EDisplayType style, UnicodeString& result) const
|
|
{
|
|
return getDisplayName(daylight,style, Locale::getDefault(), result);
|
|
}
|
|
|
|
UnicodeString&
|
|
TimeZone::getDisplayName(UBool daylight, EDisplayType style, const Locale& locale, UnicodeString& result) const
|
|
{
|
|
// SRL TODO: cache the SDF, just like java.
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
|
|
SimpleDateFormat format(style == LONG ? "zzzz" : "z",locale,status);
|
|
|
|
if(!U_SUCCESS(status))
|
|
{
|
|
// *** SRL what do I do here?!!
|
|
return result.remove();
|
|
}
|
|
|
|
// Create a new SimpleTimeZone as a stand-in for this zone; the
|
|
// stand-in will have no DST, or all DST, but the same ID and offset,
|
|
// and hence the same display name.
|
|
// We don't cache these because they're small and cheap to create.
|
|
UnicodeString tempID;
|
|
SimpleTimeZone *tz = daylight ?
|
|
// For the pure-DST zone, we use JANUARY and DECEMBER
|
|
|
|
new SimpleTimeZone(getRawOffset(), getID(tempID),
|
|
UCAL_JANUARY , 1, 0, 0,
|
|
UCAL_DECEMBER , 31, 0, U_MILLIS_PER_DAY, status) :
|
|
new SimpleTimeZone(getRawOffset(), getID(tempID));
|
|
|
|
format.applyPattern(style == LONG ? "zzzz" : "z");
|
|
Calendar *myCalendar = (Calendar*)format.getCalendar();
|
|
myCalendar->setTimeZone(*tz); // copy
|
|
|
|
delete tz;
|
|
|
|
FieldPosition pos(FieldPosition::DONT_CARE);
|
|
return format.format(UDate(196262345678.), result, pos); // Must use a valid date here.
|
|
}
|
|
|
|
|
|
/**
|
|
* Parse a custom time zone identifier and return a corresponding zone.
|
|
* @param id a string of the form GMT[+-]hh:mm, GMT[+-]hhmm, or
|
|
* GMT[+-]hh.
|
|
* @return a newly created SimpleTimeZone with the given offset and
|
|
* no Daylight Savings Time, or null if the id cannot be parsed.
|
|
*/
|
|
TimeZone*
|
|
TimeZone::createCustomTimeZone(const UnicodeString& id)
|
|
{
|
|
static const int32_t kParseFailed = -99999;
|
|
|
|
NumberFormat* numberFormat = 0;
|
|
|
|
UnicodeString idUppercase = id;
|
|
idUppercase.toUpper();
|
|
|
|
if (id.length() > GMT_ID_LENGTH &&
|
|
idUppercase.startsWith(GMT_ID))
|
|
{
|
|
ParsePosition pos(GMT_ID_LENGTH);
|
|
UBool negative = FALSE;
|
|
int32_t offset;
|
|
|
|
if (id[pos.getIndex()] == 0x002D /*'-'*/)
|
|
negative = TRUE;
|
|
else if (id[pos.getIndex()] != 0x002B /*'+'*/)
|
|
return 0;
|
|
pos.setIndex(pos.getIndex() + 1);
|
|
|
|
UErrorCode success = U_ZERO_ERROR;
|
|
numberFormat = NumberFormat::createInstance(success);
|
|
numberFormat->setParseIntegerOnly(TRUE);
|
|
|
|
|
|
// Look for either hh:mm, hhmm, or hh
|
|
int32_t start = pos.getIndex();
|
|
|
|
Formattable n(kParseFailed);
|
|
|
|
numberFormat->parse(id, n, pos);
|
|
if (pos.getIndex() == start) {
|
|
delete numberFormat;
|
|
return 0;
|
|
}
|
|
offset = n.getLong();
|
|
|
|
if (pos.getIndex() < id.length() &&
|
|
id[pos.getIndex()] == 0x003A /*':'*/)
|
|
{
|
|
// hh:mm
|
|
offset *= 60;
|
|
pos.setIndex(pos.getIndex() + 1);
|
|
int32_t oldPos = pos.getIndex();
|
|
n.setLong(kParseFailed);
|
|
numberFormat->parse(id, n, pos);
|
|
if (pos.getIndex() == oldPos) {
|
|
delete numberFormat;
|
|
return 0;
|
|
}
|
|
offset += n.getLong();
|
|
}
|
|
else
|
|
{
|
|
// hhmm or hh
|
|
|
|
// Be strict about interpreting something as hh; it must be
|
|
// an offset < 30, and it must be one or two digits. Thus
|
|
// 0010 is interpreted as 00:10, but 10 is interpreted as
|
|
// 10:00.
|
|
if (offset < 30 && (pos.getIndex() - start) <= 2)
|
|
offset *= 60; // hh, from 00 to 29; 30 is 00:30
|
|
else
|
|
offset = offset % 100 + offset / 100 * 60; // hhmm
|
|
}
|
|
|
|
if(negative)
|
|
offset = -offset;
|
|
|
|
delete numberFormat;
|
|
return new SimpleTimeZone(offset * 60000, CUSTOM_ID);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
UBool
|
|
TimeZone::hasSameRules(const TimeZone& other) const
|
|
{
|
|
return (getRawOffset() == other.getRawOffset() &&
|
|
useDaylightTime() == other.useDaylightTime());
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_FORMATTING */
|
|
|
|
//eof
|