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scuffed-code/icu4c/source/i18n/timezone.cpp
George Rhoten 8780a4d950 ICU-2966 Fix for HP-UX 
X-SVN-Rev: 12936
2003-08-25 23:01:06 +00:00

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/*
*******************************************************************************
* Copyright (C) 1997-2003, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*
* File TIMEZONE.CPP
*
* Modification History:
*
* Date Name Description
* 12/05/96 clhuang Creation.
* 04/21/97 aliu General clean-up and bug fixing.
* 05/08/97 aliu Fixed Hashtable code per code review.
* 07/09/97 helena Changed createInstance to createDefault.
* 07/29/97 aliu Updated with all-new list of 96 UNIX-derived
* TimeZones. Changed mechanism to load from static
* array rather than resource bundle.
* 07/07/1998 srl Bugfixes from the Java side: UTC GMT CAT NST
* Added getDisplayName API
* going to add custom parsing.
*
* ISSUES:
* - should getDisplayName cache something?
* - should custom time zones be cached? [probably]
* 08/10/98 stephen Brought getDisplayName() API in-line w/ conventions
* 08/19/98 stephen Changed createTimeZone() to never return 0
* 09/02/98 stephen Added getOffset(monthLen) and hasSameRules()
* 09/15/98 stephen Added getStaticClassID()
* 02/22/99 stephen Removed character literals for EBCDIC safety
* 05/04/99 stephen Changed initDefault() for Mutex issues
* 07/12/99 helena HPUX 11 CC Port.
* 12/03/99 aliu Moved data out of static table into icudata.dll.
* Substantial rewrite of zone lookup, default zone, and
* available IDs code. Misc. cleanup.
*********************************************************************************/
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
#include "unicode/simpletz.h"
#include "unicode/smpdtfmt.h"
#include "unicode/calendar.h"
#include "unicode/gregocal.h"
#include "unicode/ures.h"
#include "uresimp.h" // struct UResourceBundle
#include "olsontz.h"
#include "mutex.h"
#include "unicode/udata.h"
#include "tzdat.h"
#include "ucln_in.h"
#include "cstring.h"
#include "cmemory.h"
#include "unicode/strenum.h"
#include "uassert.h"
#define ZONEINFO "zoneinfo"
// Static data and constants
static const UChar GMT_ID[] = {0x47, 0x4D, 0x54, 0x00}; /* "GMT" */
static const int32_t GMT_ID_LENGTH = 3;
static const UChar CUSTOM_ID[] =
{
0x43, 0x75, 0x73, 0x74, 0x6F, 0x6D, 0x00 /* "Custom" */
};
static UMTX LOCK;
static TimeZone* DEFAULT_ZONE = NULL;
static TimeZone* _GMT = NULL; // cf. TimeZone::GMT
const char TimeZone::fgClassID = 0; // Value is irrelevant
// #ifdef ICU_TIMEZONE_USE_DEPRECATES
static UnicodeString* OLSON_IDS = 0;
// #endif
UBool timeZone_cleanup()
{
// #ifdef ICU_TIMEZONE_USE_DEPRECATES
delete []OLSON_IDS;
OLSON_IDS = 0;
// #endif
delete DEFAULT_ZONE;
DEFAULT_ZONE = NULL;
delete _GMT;
_GMT = NULL;
if (LOCK) {
umtx_destroy(&LOCK);
LOCK = NULL;
}
return TRUE;
}
U_NAMESPACE_BEGIN
/**
* The Olson data is stored the "zoneinfo" resource bundle.
* Sub-resources are organized into three ranges of data: Zones, final
* rules, and country tables. There is also a meta-data resource
* which has 3 integers: The number of zones, rules, and countries,
* respectively. The country count includes the non-country '%' and
* the rule count includes the non-rule '_' (the metadata).
*/
static int32_t OLSON_ZONE_START = -1; // starting index of zones
static int32_t OLSON_ZONE_COUNT = 0; // count of zones
/* We could compute all of the following, but we don't need them
static int32_t OLSON_RULE_START = 0; // starting index of rules
static int32_t OLSON_RULE_COUNT = 0; // count of zones
static int32_t OLSON_COUNTRY_START = 0; // starting index of countries
static int32_t OLSON_COUNTRY_COUNT = 0; // count of zones
*/
/**
* Given a pointer to an open "zoneinfo" resource, load up the Olson
* meta-data. Return TRUE if successful.
*/
static UBool getOlsonMeta(const UResourceBundle* top) {
if (OLSON_ZONE_START < 0) {
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle res;
ures_initStackObject(&res);
ures_getByKey(top, "_", &res, &ec);
int32_t len;
const int32_t* v = ures_getIntVector(&res, &len, &ec);
if (U_SUCCESS(ec) && len == 3) {
OLSON_ZONE_COUNT = v[0];
// Note: Remove the following `int32_t' declarations if you
// uncomment the declarations above!
int32_t OLSON_RULE_COUNT = v[1];
int32_t OLSON_COUNTRY_COUNT = v[2];
// Try to figure out how strcmp in genrb is going to sort
// things. This has to be done here, dynamically, rather
// than at build time.
char zoneCh='A', ruleCh='_', countryCh='%'; // [sic]
OLSON_ZONE_START = ((ruleCh < zoneCh) ? OLSON_RULE_COUNT : 0) +
((countryCh < zoneCh) ? OLSON_COUNTRY_COUNT : 0);
/* We could compute the following, but we don't need them -- yet
OLSON_RULE_START = ((zoneCh < ruleCh) ? OLSON_ZONE_COUNT : 0) +
((countryCh < ruleCh) ? OLSON_COUNTRY_COUNT : 0);
OLSON_COUNTRY_START = ((ruleCh < countryCh) ? OLSON_RULE_COUNT : 0) +
((zoneCh < countryCh) ? OLSON_ZONE_COUNT : 0);
*/
}
ures_close(&res);
}
return (OLSON_ZONE_START >= 0);
}
/**
* Load up the Olson meta-data. Return TRUE if successful.
*/
static UBool getOlsonMeta() {
if (OLSON_ZONE_START < 0) {
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle *top = ures_openDirect(0, ZONEINFO, &ec);
if (U_SUCCESS(ec)) {
getOlsonMeta(top);
}
ures_close(top);
}
return (OLSON_ZONE_START >= 0);
}
/**
* Given an ID, open the appropriate resource for the given time zone.
* Dereference aliases if necessary.
* @param id zone id
* @param res resource, which must be ready for use (initialized but not open)
* @param ec input-output error code
* @return top-level resource bundle
*/
static UResourceBundle* openOlsonResource(const UnicodeString& id,
UResourceBundle& res,
UErrorCode& ec) {
char buf[128];
id.extract(0, sizeof(buf)-1, buf, sizeof(buf), "");
UResourceBundle *top = ures_openDirect(0, ZONEINFO, &ec);
ures_getByKey(top, buf, &res, &ec);
// Dereference if this is an alias. Docs say result should be 1
// but it is 0 in 2.8 (?).
if (ures_getSize(&res) <= 1 && getOlsonMeta(top)) {
int32_t deref = ures_getInt(&res, &ec) + OLSON_ZONE_START;
ures_close(&res);
ures_getByIndex(top, deref, &res, &ec);
}
return top;
}
// TODO: #ifdef out this code after 8-Nov-2003
// #ifdef ICU_TIMEZONE_USE_DEPRECATES
/**
* Load all the ids from the "zoneinfo" resource bundle into a static
* array that we hang onto. This is _only_ used to implement the
* deprecated createAvailableIDs() API.
*/
static UBool loadOlsonIDs() {
if (OLSON_IDS != 0) {
return TRUE;
}
UErrorCode ec = U_ZERO_ERROR;
UnicodeString* ids = 0;
int32_t count = 0;
UResourceBundle *top = ures_openDirect(0, ZONEINFO, &ec);
if (U_SUCCESS(ec)) {
getOlsonMeta(top);
int32_t start = OLSON_ZONE_START;
count = OLSON_ZONE_COUNT;
ids = new UnicodeString[(count > 0) ? count : 1];
UResourceBundle res;
ures_initStackObject(&res);
for (int32_t i=0; i<count; ++i) {
ures_getByIndex(top, start+i, &res, &ec);
if (U_FAILURE(ec)) {
ures_close(&res);
break;
}
const char* key = ures_getKey(&res);
U_ASSERT(*key != '_' && *key != '%');
int32_t len = uprv_strlen(key);
ids[i] = UnicodeString(key, len+1, "");
ids[i].truncate(len); // add a NUL but don't count it so that
// getBuffer() gets a terminated string
ures_close(&res);
}
}
ures_close(top);
if (U_FAILURE(ec)) {
delete[] ids;
return FALSE;
}
// Keep mutexed operations as short as possible by doing all
// computations first, then doing pointer copies within the mutex.
umtx_lock(&LOCK);
if (OLSON_IDS == 0) {
OLSON_IDS = ids;
ids = 0;
}
umtx_unlock(&LOCK);
// If another thread initialized the statics first, then delete
// our unused data.
delete[] ids;
return TRUE;
}
// #endif //ICU_TIMEZONE_USE_DEPRECATES
// -------------------------------------
const TimeZone*
TimeZone::getGMT(void)
{
umtx_init(&LOCK); /* This is here to prevent race conditions. */
Mutex lock(&LOCK);
// Initialize _GMT independently of other static data; it should
// be valid even if we can't load the time zone UDataMemory.
if (_GMT == 0) {
_GMT = new SimpleTimeZone(0, UnicodeString(GMT_ID, GMT_ID_LENGTH));
}
return _GMT;
}
// *****************************************************************************
// class TimeZone
// *****************************************************************************
TimeZone::TimeZone()
: UObject(), fID()
{
}
// -------------------------------------
TimeZone::TimeZone(const UnicodeString &id)
: UObject(), fID(id)
{
}
// -------------------------------------
TimeZone::~TimeZone()
{
}
// -------------------------------------
TimeZone::TimeZone(const TimeZone &source)
: UObject(source), fID(source.fID)
{
}
// -------------------------------------
TimeZone &
TimeZone::operator=(const TimeZone &right)
{
if (this != &right) fID = right.fID;
return *this;
}
// -------------------------------------
UBool
TimeZone::operator==(const TimeZone& that) const
{
return getDynamicClassID() == that.getDynamicClassID() &&
fID == that.fID;
}
// -------------------------------------
TimeZone*
TimeZone::createTimeZone(const UnicodeString& ID)
{
/* We first try to lookup the zone ID in our system list. If this
* fails, we try to parse it as a custom string GMT[+-]hh:mm. If
* all else fails, we return GMT, which is probably not what the
* user wants, but at least is a functioning TimeZone object.
*
* We cannot return NULL, because that would break compatibility
* with the JDK.
*/
TimeZone* result = createSystemTimeZone(ID);
if (result == 0) {
result = createCustomTimeZone(ID);
}
if (result == 0) {
result = getGMT()->clone();
}
return result;
}
/**
* Lookup the given name in our system zone table. If found,
* instantiate a new zone of that name and return it. If not
* found, return 0.
*/
TimeZone*
TimeZone::createSystemTimeZone(const UnicodeString& id) {
TimeZone* z = 0;
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle res;
ures_initStackObject(&res);
UResourceBundle *top = openOlsonResource(id, res, ec);
if (U_SUCCESS(ec)) {
z = new OlsonTimeZone(top, &res, ec);
if (z) z->setID(id); // Hmm. cleanup? TODO
}
ures_close(&res);
ures_close(top);
if (U_FAILURE(ec)) {
delete z;
z = 0;
}
return z;
}
// -------------------------------------
/**
* Initialize DEFAULT_ZONE from the system default time zone. The
* caller should confirm that DEFAULT_ZONE is NULL before calling.
* Upon return, DEFAULT_ZONE will not be NULL, unless operator new()
* returns NULL.
*
* Must be called OUTSIDE mutex.
*/
void
TimeZone::initDefault()
{
// We access system timezone data through TPlatformUtilities,
// including tzset(), timezone, and tzname[].
int32_t rawOffset = 0;
const char *hostID;
// First, try to create a system timezone, based
// on the string ID in tzname[0].
{
// NOTE: Global mutex here; TimeZone mutex above
// mutexed to avoid threading issues in the platform fcns.
// Some of the locale/timezone OS functions may not be thread safe,
// so the intent is that any setting from anywhere within ICU
// happens with the ICU global mutex held.
Mutex lock;
uprv_tzset(); // Initialize tz... system data
// Get the timezone ID from the host. This function should do
// any required host-specific remapping; e.g., on Windows this
// function maps the Date and Time control panel setting to an
// ICU timezone ID.
hostID = uprv_tzname(0);
// Invert sign because UNIX semantics are backwards
rawOffset = uprv_timezone() * -U_MILLIS_PER_SECOND;
}
TimeZone* default_zone = NULL;
default_zone = createSystemTimeZone(hostID);
#if 0
// NOTE: As of ICU 2.8, we no longer have an offsets table, since
// historical zones can change offset over time. If we add
// build-time heuristics to infer the "most frequent" raw offset
// of a zone, we can build tables and institute defaults, as done
// in ICU <= 2.6.
// If we couldn't get the time zone ID from the host, use
// the default host timezone offset. Further refinements
// to this include querying the host to determine if DST
// is in use or not and possibly using the host locale to
// select from multiple zones at a the same offset. We
// don't do any of this now, but we could easily add this.
if (default_zone == NULL) {
// Use the designated default in the time zone list that has the
// appropriate GMT offset, if there is one.
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
default_zone = createSystemTimeZone(ZONE_IDS[index->defaultZone]);
break;
}
// 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);
}
}
#endif
// Construct a fixed standard zone with the host's ID
// and raw offset.
if (default_zone == NULL) {
default_zone =
new SimpleTimeZone(rawOffset, UnicodeString(hostID, (char*)0));
}
// If we _still_ don't have a time zone, use GMT.
if (default_zone == NULL) {
default_zone = getGMT()->clone();
}
// If DEFAULT_ZONE is still NULL, set it up.
umtx_lock(&LOCK);
if (DEFAULT_ZONE == NULL) {
DEFAULT_ZONE = default_zone;
default_zone = NULL;
}
umtx_unlock(&LOCK);
delete default_zone;
}
// -------------------------------------
TimeZone*
TimeZone::createDefault()
{
umtx_init(&LOCK); /* This is here to prevent race conditions. */
umtx_lock(&LOCK);
UBool f = (DEFAULT_ZONE != 0);
umtx_unlock(&LOCK);
if (!f) {
initDefault();
}
Mutex lock(&LOCK); // In case adoptDefault is called
return DEFAULT_ZONE->clone();
}
// -------------------------------------
void
TimeZone::adoptDefault(TimeZone* zone)
{
if (zone != NULL)
{
TimeZone* old = NULL;
umtx_init(&LOCK); /* This is here to prevent race conditions. */
umtx_lock(&LOCK);
old = DEFAULT_ZONE;
DEFAULT_ZONE = zone;
umtx_unlock(&LOCK);
delete old;
}
}
// -------------------------------------
void
TimeZone::setDefault(const TimeZone& zone)
{
adoptDefault(zone.clone());
}
//----------------------------------------------------------------------
// Support methods for getOffset(millis...)
// TODO clean up; consolidate with GregorianCalendar, TimeZone, StandarTimeZone
/**
* Return floor(numerator/denominator); handles extreme values correctly.
*/
static int32_t floorDivide(int32_t numerator, int32_t denominator) {
return (numerator >= 0) ?
numerator / denominator : ((numerator + 1) / denominator) - 1;
}
static int32_t floorDivide(int32_t numerator, int32_t denominator,
int32_t& remainder) {
int32_t quotient = floorDivide(numerator, denominator);
remainder = numerator - (quotient * denominator);
return quotient;
}
static double floorDivide(double numerator, double denominator,
double& remainder) {
double quotient = uprv_floor(numerator / denominator);
remainder = numerator - (quotient * denominator);
return quotient;
}
static int32_t floorDivide(double numerator, int32_t denominator,
int32_t& remainder) {
double quotient, rem;
quotient = floorDivide(numerator, (double)denominator, rem);
remainder = (int32_t) rem;
return (int32_t) quotient;
}
static const int32_t JULIAN_1_CE = 1721426; // January 1, 1 CE Gregorian
static const int32_t JULIAN_1970_CE = 2440588; // January 1, 1970 CE Gregorian
/**
* The number of days before the given month. There are two sets of
* values for Jan..Dec; one set for non-leap years followed by another
* set for leap years.
*/
static const int16_t DAYS_BEFORE[] =
{0,31,59,90,120,151,181,212,243,273,304,334,
0,31,60,91,121,152,182,213,244,274,305,335};
static const int8_t MONTH_LENGTH[] =
{31,28,31,30,31,30,31,31,30,31,30,31,
31,29,31,30,31,30,31,31,30,31,30,31};
static UBool isLeapYear(int year) {
return (year%4 == 0) && ((year%100 != 0) || (year%400 == 0));
}
/**
* Convert a 1970-epoch day number to proleptic Gregorian year, month,
* day-of-month, and day-of-week.
* @param day 1970-epoch day (integral value)
* @param year output parameter to receive year
* @param month output parameter to receive month (0-based, 0==Jan)
* @param dom output parameter to receive day-of-month (1-based)
* @param dow output parameter to receive day-of-week (1-based, 1==Sun)
*/
static void dayToFields(double day, int32_t& year, int32_t& month,
int32_t& dom, int32_t& dow) {
int32_t doy;
// Convert from 1970 CE epoch to 1 CE epoch (Gregorian calendar)
day += JULIAN_1970_CE - JULIAN_1_CE;
int32_t n400 = floorDivide(day, 146097, doy); // 400-year cycle length
int32_t n100 = floorDivide(doy, 36524, doy); // 100-year cycle length
int32_t n4 = floorDivide(doy, 1461, doy); // 4-year cycle length
int32_t n1 = floorDivide(doy, 365, doy);
year = 400*n400 + 100*n100 + 4*n4 + n1;
if (n100 == 4 || n1 == 4) {
doy = 365; // Dec 31 at end of 4- or 400-year cycle
} else {
++year;
}
UBool isLeap = isLeapYear(year);
// Gregorian day zero is a Monday.
dow = (int32_t) uprv_fmod(day + 1, 7);
dow += (dow < 0) ? (UCAL_SUNDAY + 7) : UCAL_SUNDAY;
// Common Julian/Gregorian calculation
int32_t correction = 0;
int32_t march1 = isLeap ? 60 : 59; // zero-based DOY for March 1
if (doy >= march1) {
correction = isLeap ? 1 : 2;
}
month = (12 * (doy + correction) + 6) / 367; // zero-based month
dom = doy - DAYS_BEFORE[month + (isLeap ? 12 : 0)] + 1; // one-based DOM
}
//----------------------------------------------------------------------
/**
* This is the default implementation for subclasses that do not
* override this method. This implementation calls through to the
* 8-argument getOffset() method after suitable computations, and
* correctly adjusts GMT millis to local millis when necessary.
*/
void TimeZone::getOffset(UDate date, UBool local, int32_t& rawOffset,
int32_t& dstOffset, UErrorCode& ec) const {
if (U_FAILURE(ec)) {
return;
}
rawOffset = getRawOffset();
// Convert to local wall millis if necessary
if (!local) {
date += rawOffset; // now in local standard millis
}
// When local==FALSE, we might have to recompute. This loop is
// executed once, unless a recomputation is required; then it is
// executed twice.
for (int32_t pass=0; ; ++pass) {
int32_t year, month, dom, dow;
double day = uprv_floor(date / U_MILLIS_PER_DAY);
int32_t millis = (int32_t) (date - day * U_MILLIS_PER_DAY);
dayToFields(day, year, month, dom, dow);
dstOffset = getOffset(GregorianCalendar::AD, year, month, dom,
(uint8_t) dow, millis,
MONTH_LENGTH[month + isLeapYear(year)?12:0],
ec) - rawOffset;
// Recompute if local==FALSE, dstOffset!=0, and addition of
// the dstOffset puts us in a different day.
if (pass!=0 || local || dstOffset==0) {
break;
}
date += dstOffset;
if (uprv_floor(date / U_MILLIS_PER_DAY) == day) {
break;
}
}
}
// -------------------------------------
// New available IDs API as of ICU 2.4. Uses StringEnumeration API.
class TZEnumeration : public StringEnumeration {
// Map into to zones. Our results are zone[map[i]] for
// i=0..len-1, where zone[i] is the i-th Olson zone. If map==NULL
// then our results are zone[i] for i=0..len-1. Len will be zero
// iff the zone data could not be loaded.
int32_t* map;
int32_t len;
int32_t pos;
void* _bufp;
int32_t _buflen;
UnicodeString id;
public:
TZEnumeration() {
map = NULL;
_bufp = NULL;
len = pos = _buflen = 0;
if (getOlsonMeta()) {
len = OLSON_ZONE_COUNT;
}
}
TZEnumeration(int32_t rawOffset) {
map = NULL;
_bufp = NULL;
len = pos = _buflen = 0;
if (!getOlsonMeta()) {
return;
}
// Allocate more space than we'll need. The end of the array will
// be blank.
map = (int32_t*)uprv_malloc(OLSON_ZONE_COUNT * sizeof(int32_t));
if (map == 0) {
return;
}
uprv_memset(map, 0, sizeof(int32_t) * OLSON_ZONE_COUNT);
UnicodeString s;
for (int32_t i=0; i<OLSON_ZONE_COUNT; ++i) {
if (getID(i)) {
// This is VERY inefficient.
TimeZone* z = TimeZone::createTimeZone(id);
// Make sure we get back the ID we wanted (if the ID is
// invalid we get back GMT).
if (z != 0 && z->getID(s) == id &&
z->getRawOffset() == rawOffset) {
map[len++] = i;
}
delete z;
}
}
}
TZEnumeration(const char* country) {
map = NULL;
_bufp = NULL;
len = pos = _buflen = 0;
if (!getOlsonMeta()) {
return;
}
char key[4] = {'%', 0, 0, 0}; // e.g., "%US", or "%" for no country
if (country) uprv_strncat(key, country, 2);
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle *top = ures_openDirect(0, ZONEINFO, &ec);
if (U_SUCCESS(ec)) {
UResourceBundle res;
ures_initStackObject(&res);
ures_getByKey(top, key, &res, &ec);
// The list of zones is a list of integers, from 0..n-1,
// where n is the total number of system zones.
const int32_t* v = ures_getIntVector(&res, &len, &ec);
if (U_SUCCESS(ec)) {
U_ASSERT(len > 0);
map = (int32_t*)uprv_malloc(sizeof(int32_t) * len);
if (map != 0) {
for (uint16_t i=0; i<len; ++i) {
U_ASSERT(v[i] >= 0 && v[i] < OLSON_ZONE_COUNT);
map[i] = v[i];
}
}
}
ures_close(&res);
}
ures_close(top);
}
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();
}
U_ASSERT(us == &id); // A little ugly...
return id.getTerminatedBuffer(); // ...but works
}
return NULL;
}
const UnicodeString* snext(UErrorCode& status) {
if (U_SUCCESS(status) && pos < len) {
getID((map == 0) ? pos : map[pos]);
++pos;
return &id;
}
return 0;
}
void reset(UErrorCode& /*status*/) {
pos = 0;
}
private:
UBool getID(int32_t i) {
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle *top = ures_openDirect(0, ZONEINFO, &ec);
UResourceBundle res;
ures_initStackObject(&res);
ures_getByIndex(top, OLSON_ZONE_START + i, &res, &ec);
if (U_SUCCESS(ec)) {
const char* key = ures_getKey(&res);
id = UnicodeString(key, "");
} else {
id.truncate(0);
}
ures_close(&res);
ures_close(top);
return U_SUCCESS(ec);
}
static const char fgClassID;
public:
static inline UClassID getStaticClassID(void) { return (UClassID)&fgClassID; }
virtual UClassID getDynamicClassID(void) const { return getStaticClassID(); }
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.
numIDs = 0;
if (!loadOlsonIDs()) {
return 0;
}
// Allocate more space than we'll need. The end of the array will
// be blank.
const UnicodeString** ids =
(const UnicodeString** )uprv_malloc(OLSON_ZONE_COUNT * sizeof(UnicodeString *));
if (ids == 0) {
return 0;
}
uprv_memset(ids, 0, sizeof(UnicodeString*) * OLSON_ZONE_COUNT);
UnicodeString s;
for (int32_t i=0; i<OLSON_ZONE_COUNT; ++i) {
// This is VERY inefficient.
TimeZone* z = TimeZone::createTimeZone(OLSON_IDS[i]);
// Make sure we get back the ID we wanted (if the ID is
// invalid we get back GMT).
if (z != 0 && z->getID(s) == OLSON_IDS[i] &&
z->getRawOffset() == rawOffset) {
ids[numIDs++] = &OLSON_IDS[i]; // [sic]
}
delete z;
}
return ids;
}
// -------------------------------------
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.
numIDs = 0;
if (!loadOlsonIDs()) {
return 0;
}
char key[4] = {'%', 0, 0, 0}; // e.g., "%US", or "%" for non-country zones
if (country) uprv_strncat(key, country, 2);
const UnicodeString** ids = 0;
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle *top = ures_openDirect(0, ZONEINFO, &ec);
if (U_SUCCESS(ec)) {
getOlsonMeta(top);
UResourceBundle res;
ures_initStackObject(&res);
ures_getByKey(top, key, &res, &ec);
if (U_SUCCESS(ec)) {
/* 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
* OLSON_IDS.
*/
const int32_t* v = ures_getIntVector(&res, &numIDs, &ec);
ids = (const UnicodeString**)
uprv_malloc(numIDs * sizeof(UnicodeString*));
if (ids == 0) {
numIDs = 0;
} else {
for (int32_t i=0; i<numIDs; ++i) {
ids[i] = &OLSON_IDS[v[i]]; // [sic]
}
}
}
ures_close(&res);
}
ures_close(top);
return ids;
}
// -------------------------------------
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.
numIDs = 0;
if (!loadOlsonIDs()) {
return 0;
}
const UnicodeString** ids =
(const UnicodeString** )uprv_malloc(OLSON_ZONE_COUNT * sizeof(UnicodeString *));
if (ids != 0) {
numIDs = OLSON_ZONE_COUNT;
for (int32_t i=0; i<numIDs; ++i) {
ids[i] = &OLSON_IDS[i];
}
}
return ids;
}
// ICU_TIMEZONE_USE_DEPRECATES
// #endif
// see above
// ---------------------------------------
int32_t
TimeZone::countEquivalentIDs(const UnicodeString& id) {
int32_t result = 0;
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle res;
ures_initStackObject(&res);
UResourceBundle *top = openOlsonResource(id, res, ec);
if (U_SUCCESS(ec)) {
int32_t size = ures_getSize(&res);
if (size == 4 || size == 6) {
UResourceBundle r;
ures_initStackObject(&r);
ures_getByIndex(&res, size-1, &r, &ec);
// result = ures_getSize(&r); // doesn't work
ures_getIntVector(&r, &result, &ec);
ures_close(&r);
}
}
ures_close(&res);
ures_close(top);
return result;
}
// ---------------------------------------
const UnicodeString
TimeZone::getEquivalentID(const UnicodeString& id, int32_t index) {
UnicodeString result;
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle res;
ures_initStackObject(&res);
UResourceBundle *top = openOlsonResource(id, res, ec);
int32_t zone = -1;
if (U_SUCCESS(ec)) {
int32_t size = ures_getSize(&res);
if (size == 4 || size == 6) {
UResourceBundle r;
ures_initStackObject(&r);
ures_getByIndex(&res, size-1, &r, &ec);
const int32_t* v = ures_getIntVector(&r, &size, &ec);
if (index >= 0 && index < size && getOlsonMeta()) {
zone = v[index] + OLSON_ZONE_START;
}
ures_close(&r);
}
}
ures_close(&res);
if (zone >= 0) {
ures_getByIndex(top, zone, &res, &ec);
if (U_SUCCESS(ec)) {
const char* key = ures_getKey(&res);
result = UnicodeString(key, "");
}
ures_close(&res);
}
ures_close(top);
return result;
}
// ---------------------------------------
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
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