635 lines
22 KiB
C++
635 lines
22 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 1997-1999, 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/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 "cstring.h"
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#ifdef _DEBUG
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#include "unistrm.h"
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#endif
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// static initialization
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char TimeZone::fgClassID = 0; // Value is irrelevant
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TimeZone* TimeZone::fgDefaultZone = NULL;
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const UnicodeString TimeZone::GMT_ID = UNICODE_STRING("GMT", 3);
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const int32_t TimeZone::GMT_ID_LENGTH = 3;
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const UnicodeString TimeZone::CUSTOM_ID = UNICODE_STRING("Custom", 6);
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const TimeZone* TimeZone::GMT = new SimpleTimeZone(0, GMT_ID);
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// See header file for documentation of the following
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const TZHeader * TimeZone::DATA = 0;
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const uint32_t* TimeZone::INDEX_BY_ID = 0;
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const OffsetIndex* TimeZone::INDEX_BY_OFFSET = 0;
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UnicodeString* TimeZone::ZONE_IDS = 0;
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UBool TimeZone::DATA_LOADED = FALSE;
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UDataMemory* TimeZone::UDATA_POINTER = 0;
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UMTX TimeZone::LOCK;
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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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void TimeZone::loadZoneData() {
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if (!DATA_LOADED) {
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Mutex lock(&LOCK);
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if (!DATA_LOADED) {
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UErrorCode status = U_ZERO_ERROR;
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UDATA_POINTER = udata_openChoice(0, TZ_DATA_TYPE, TZ_DATA_NAME, // THIS IS NOT A LEAK!
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isDataAcceptable, 0, &status); // see the comment on udata_close line
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UDataMemory *data = UDATA_POINTER;
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if (U_SUCCESS(status)) {
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DATA = (TZHeader*)udata_getMemory(data);
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// Result guaranteed to be nonzero if data is nonzero
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// We require that standard zones occur before DST
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// zones. Do a quick check for this here, and if the
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// check fails, don't use this zone data.
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// (Alternatively, we could handle either ordering,
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// with a little extra logic.) See
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// createSystemTimeZone().
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if (DATA->standardDelta > DATA->dstDelta) {
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DATA = 0;
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} else {
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INDEX_BY_ID =
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(const uint32_t*)((int8_t*)DATA + DATA->nameIndexDelta);
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INDEX_BY_OFFSET =
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(const OffsetIndex*)((int8_t*)DATA + DATA->offsetIndexDelta);
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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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ZONE_IDS = new UnicodeString[DATA->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*)DATA + DATA->nameTableDelta;
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for (uint32_t i=0; i<DATA->count; ++i) {
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ZONE_IDS[i] = UnicodeString(name, ""); // invariant converter
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name += uprv_strlen(name) + 1;
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}
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}
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//udata_close(data); // Without udata_close purify will report a leak. However, DATA_LOADED is
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// static, and udata_openChoice will be called only once, and data from
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// udata_openChoice needs to stick around.
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}
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// Whether we succeed or fail, stop future attempts
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DATA_LOADED = TRUE;
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}
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}
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}
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/**
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* udata callback to verify the zone data.
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*/
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UBool U_CALLCONV
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TimeZone::isDataAcceptable(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] == 0x7a && // see TZ_SIG, must be numeric literals to be portable
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pInfo->dataFormat[1] == 0x6f && // (this is not a string, it just looks like one for debugging)
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pInfo->dataFormat[2] == 0x6e &&
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pInfo->dataFormat[3] == 0x65 &&
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pInfo->formatVersion[0] == TZ_FORMAT_VERSION;
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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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{
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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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: 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 = GMT->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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// 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 = name.compare(ZONE_IDS[i]);
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if (c == 0) {
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const int8_t* z = (int8_t*)DATA + INDEX_BY_ID[i];
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// NOTE: standard zones must be before DST zones. We test
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// for this when loading up the data; see loadZoneData().
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return INDEX_BY_ID[i] < DATA->dstDelta ?
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new SimpleTimeZone(*(const StandardZone*)z, name) :
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new SimpleTimeZone(*(const DSTZone*)z, name);
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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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// fgDefaultZone from the system default time zone. If
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// fgDefaultZone is already filled in, we obviously don't have to
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// do anything.
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if (fgDefaultZone == 0) {
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Mutex lock(&LOCK);
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if (fgDefaultZone == 0) {
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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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Mutex lock; // mutexed to avoid threading issues in the platform fcns.
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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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fgDefaultZone = 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 (fgDefaultZone == 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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fgDefaultZone = 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 (fgDefaultZone == 0) {
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fgDefaultZone = GMT->clone();
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}
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}
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}
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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 fgDefaultZone is not NULL
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Mutex lock(&LOCK); // In case adoptDefault is called
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return fgDefaultZone->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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Mutex mutex(&LOCK);
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if (fgDefaultZone != NULL) {
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delete fgDefaultZone;
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}
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fgDefaultZone = zone;
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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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const UnicodeString** const
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TimeZone::createAvailableIDs(int32_t rawOffset, int32_t& numIDs)
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{
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// We are creating a new array to existing UnicodeString pointers.
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// The caller will delete the array when done, but not the pointers
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// in the array.
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if (!DATA_LOADED) {
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loadZoneData();
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}
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if (0 == DATA) {
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numIDs = 0;
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return 0;
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}
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/* The offset index table is a table of variable-sized objects.
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* Each entry has an offset to the next entry; the last entry has
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* a next entry offset of zero.
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*
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* The entries are sorted in ascending numerical order of GMT
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* offset. Each entry lists all the system zones at that offset,
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* in lexicographic order of ID. Note that this ordering is
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* somewhat significant in that the _first_ zone in each list is
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* what will be chosen as the default under certain fallback
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* conditions. We currently just let that be the
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* lexicographically first zone, but we could also adjust the list
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* to pick which zone was first for this situation -- probably not
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* worth the trouble, except for the fact that this fallback is
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* _always_ used to determine the default zone on Windows.
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*
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* The list of zones is actually just a list of integers, from
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* 0..n-1, where n is the total number of system zones. The
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* numbering corresponds exactly to the ordering of ZONE_IDS.
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*/
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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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const UnicodeString** const result =
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(const UnicodeString** const) new UnicodeString*[index->count];
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const uint16_t* zoneNumberArray = &(index->zoneNumber);
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for (uint16_t i=0; i<index->count; ++i) {
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// Pointer assignment - use existing UnicodeString object!
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// Don't create a new UnicodeString on the heap here!
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result[i] = &ZONE_IDS[zoneNumberArray[i]];
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}
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numIDs = index->count;
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return result;
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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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numIDs = 0;
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return 0;
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}
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// -------------------------------------
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const UnicodeString** const
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TimeZone::createAvailableIDs(int32_t& numIDs)
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{
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// We are creating a new array to existing UnicodeString pointers.
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// The caller will delete the array when done, but not the pointers
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// in the array.
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//
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// This is really unnecessary, given the fact that we have an
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// array of the IDs already constructed, and we could just return
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// that. However, that would be a breaking API change, and some
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// callers familiar with the original API might try to delete it.
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if (!DATA_LOADED) {
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loadZoneData();
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}
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if (0 == DATA) {
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numIDs = 0;
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return 0;
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}
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const UnicodeString** const result =
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(const UnicodeString** const) new UnicodeString*[DATA->count];
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// Create a list of pointers to each and every zone ID
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for (uint32_t i=0; i<DATA->count; ++i) {
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// Pointer assignment - use existing UnicodeString object!
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// Don't create a new UnicodeString on the heap here!
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result[i] = &ZONE_IDS[i];
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}
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numIDs = DATA->count;
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return result;
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}
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// ---------------------------------------
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UnicodeString&
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TimeZone::getDisplayName(UnicodeString& result) const
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{
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return getDisplayName(FALSE,LONG,Locale::getDefault(), result);
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}
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UnicodeString&
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TimeZone::getDisplayName(const Locale& locale, UnicodeString& result) const
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{
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return getDisplayName(FALSE, LONG, locale, result);
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}
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UnicodeString&
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TimeZone::getDisplayName(UBool daylight, EDisplayType style, UnicodeString& result) const
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{
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return getDisplayName(daylight,style, Locale::getDefault(), result);
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}
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UnicodeString&
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TimeZone::getDisplayName(UBool daylight, EDisplayType style, const Locale& locale, UnicodeString& result) const
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{
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// SRL TODO: cache the SDF, just like java.
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UErrorCode status = U_ZERO_ERROR;
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SimpleDateFormat format(style == LONG ? "zzzz" : "z",locale,status);
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if(!U_SUCCESS(status))
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{
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// *** SRL what do I do here?!!
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return result.remove();
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}
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// Create a new SimpleTimeZone as a stand-in for this zone; the
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// stand-in will have no DST, or all DST, but the same ID and offset,
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// and hence the same display name.
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// We don't cache these because they're small and cheap to create.
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UnicodeString tempID;
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SimpleTimeZone *tz = daylight ?
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// For the pure-DST zone, we use JANUARY and DECEMBER
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new SimpleTimeZone(getRawOffset(), getID(tempID),
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Calendar::JANUARY , 1, 0, 0,
|
|
Calendar::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());
|
|
}
|
|
|
|
//eof
|