зеркало из https://github.com/mozilla/gecko-dev.git
364 строки
16 KiB
C++
364 строки
16 KiB
C++
/*
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********************************************************************************
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* *
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* COPYRIGHT: *
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* (C) Copyright Taligent, Inc., 1997 *
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* (C) Copyright International Business Machines Corporation, 1997 *
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* Licensed Material - Program-Property of IBM - All Rights Reserved. *
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* US Government Users Restricted Rights - Use, duplication, or disclosure *
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* restricted by GSA ADP Schedule Contract with IBM Corp. *
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* *
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********************************************************************************
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*
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* File TIMEZONE.H
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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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* 04/21/97 aliu Overhauled header.
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* 07/09/97 helena Changed createInstance to createDefault.
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* 08/06/97 aliu Removed dependency on internal header for Hashtable.
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********************************************************************************
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*/
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#ifndef _NLSTIMEZONE
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#define _NLSTIMEZONE
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#include "unistring.h"
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class SimpleTimeZone;
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class Hashtable;
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/**
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* TimeZone is an abstract class representing a time zone. A TimeZone is needed for
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* Calendar to produce local time for a particular time zone. A TimeZone comprises
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* three basic pieces of information:<ul>
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* <li>A time zone offset; that, is the number of milliseconds to add or subtract
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* from a time expressed in terms of GMT to convert it to the same time in that
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* time zone (without taking daylight savings time into account).
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* <li>Logic necessary to take daylight savings time into account if daylight savings
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* time is observed in that time zone (e.g., the days and hours on which daylight
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* savings time begins and ends).
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* <li>An ID. This is a text string that uniquely identifies the time zone.</ul>
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*
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* (Only the ID is actually implemented in TimeZone; subclasses of TimeZone may handle
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* daylight savings time and GMT offset in different ways. Currently we only have one
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* TimeZone subclass: SimpleTimeZone.)
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* <P>
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* The TimeZone class contains a static list containing a TimeZone object for every
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* combination of GMT offset and daylight-savings time rules currently in use in the
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* world, each with a unique ID. Each ID consists of a region (usually a continent or
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* ocean) and a city in that region, separated by a slash, (for example, Pacific
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* Standard Time is "America/Los_Angeles.") Because older versions of this class used
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* three- or four-letter abbreviations instead, there is also a table that maps the older
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* abbreviations to the newer ones (for example, "PST" maps to "America/LosAngeles").
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* Anywhere the API requires an ID, you can use either form.
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* <P>
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* To create a new TimeZone, you call the factory function TimeZone::createTimeZone()
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* and pass it a time zone ID. You can use the createAvailableIDs() function to
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* obtain a list of all the time zone IDs recognized by createTimeZone().
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* <P>
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* You can also use TimeZone::createDefault() to create a TimeZone. This function uses
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* platform-specific APIs to produce a TimeZone for the time zone corresponding to
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* the client's computer's physical location. For example, if you're in Japan (assuming
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* your machine is set up correctly), TimeZone::createDefault() will return a TimeZone
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* for Japanese Standard Time ("Asia/Tokyo").
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*/
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#ifdef NLS_MAC
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#pragma export on
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#endif
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class T_FORMAT_API TimeZone {
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public:
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virtual ~TimeZone();
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/**
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* Creates a new TimeZone for the given tmie zone ID. If the given ID is not
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* supported by TimeZone class, returns null. The result is a new TimeZone object
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* that the client owns and is responsible for deleting.
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*
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* @param ID A time zone ID.
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* @return A new TimeZone corresponding to the time zone with the given ID,
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* or NULL if there is no time zone with the given ID.
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*/
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static TimeZone* createTimeZone(const UnicodeString& ID);
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/**
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* Returns a list of time zone IDs, one for each time zone with a given GMT offset.
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* The return value is a list because there may be several times zones with the same
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* GMT offset that differ in the way they handle daylight savings time. For example,
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* the state of Arizona doesn't observe Daylight Savings time. So if you ask for
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* the time zone IDs corresponding to GMT-7:00, you'll get back two time zone IDs:
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* "America/Denver," which corresponds to Mountain Standard Time in the winter and
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* Mountain Daylight Time in the summer, and "America/Phoenix", which corresponds to
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* Mountain Standard Time year-round, even in the summer.
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* <P>
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* The caller owns the list that is returned, but does not own the strings contained
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* in that list. Delete the array, but DON'T delete the elements in the array.
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*
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* @param rawOffset An offset from GMT in milliseconds.
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* @param numIDs Receives the number of items in the array that is returned.
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* @return An array of UnicodeString pointers, where each UnicodeString is
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* a time zone ID for a time zone with the given GMT offset. If
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* there is no timezone that matches the GMT offset
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* specified, NULL is returned.
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*/
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static const UnicodeString** const createAvailableIDs(t_int32 rawOffset, long& numIDs);
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/**
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* Returns a list of all time zone IDs supported by the TimeZone class (i.e., all
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* IDs that it's legal to pass to createTimeZone()). The caller owns the list that
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* is returned, but does not own the strings contained in that list. Delete the array,
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* but DON'T delete the elements in the array.
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*
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* @param numIDs Receives the number of zone IDs returned.
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* @return An array of UnicodeString pointers, where each is a time zone ID
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* supported by the TimeZone class.
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*/
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static const UnicodeString** const createAvailableIDs(long& numIDs);
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/**
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* Creates a new copy of the default TimeZone for this host. Unless the default time
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* zone has already been set using adoptDefault() or serDefault(), the default is
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* determined by querying the system using methods in TPlatformUtilities. If the
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* system routines fail, or if they specify a TimeZone or TimeZone offset which is not
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* recognized, the TimeZone indicated by the ID kLastResortID is instantiated
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* and made the default.
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*
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* @return A default TimeZone. Clients are responsible for deleting the time zone
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* object returned.
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*/
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static TimeZone* createDefault();
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/**
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* Sets the default time zone (i.e., what's returned by getDefault()) to be the
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* specified time zone. If NULL is specified for the time zone, the default time
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* zone is set to the default host time zone. This call adopts the TimeZone object
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* passed in; the clent is no longer responsible for deleting it.
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*
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* @param zone A pointer to the new TimeZone object to use as the default.
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*/
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static void adoptDefault(TimeZone* zone);
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/**
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* Same as adoptDefault(), except that the TimeZone object passed in is NOT adopted;
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* the caller remains responsible for deleting it.
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*
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* @param zone The given timezone.
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*/
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static void setDefault(const TimeZone& zone);
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/**
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* Returns true if the two TimeZones are equal. (The TimeZone version only compares
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* IDs, but subclasses are expected to also compare the fields they add.)
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*
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* @param that The TimeZone object to be compared with.
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* @return True if the given TimeZone is equal to this TimeZone; false
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* otherwise.
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*/
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virtual t_bool operator==(const TimeZone& that) const;
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/**
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* Returns true if the two TimeZones are NOT equal; that is, if operator==() returns
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* false.
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*
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* @param that The TimeZone object to be compared with.
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* @return True if the given TimeZone is not equal to this TimeZone; false
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* otherwise.
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*/
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t_bool operator!=(const TimeZone& that) const {return !operator==(that);}
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/**
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* Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add
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* to GMT to get local time in this time zone, taking daylight savings time into
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* account) as of a particular reference date. The reference date is used to determine
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* whether daylight savings time is in effect and needs to be figured into the offset
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* that is returned (in other words, what is the adjusted GMT offset in this time zone
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* at this particular date and time?). For the time zones produced by createTimeZone(),
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* the reference data is specified according to the Gregorian calendar, and the date
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* and time fields are in GMT, NOT local time.
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*
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* @param era The reference date's era
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* @param year The reference date's year
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* @param month The reference date's month (0-based; 0 is January)
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* @param day The reference date's day-in-month (1-based)
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* @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday)
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* @param millis The reference date's milliseconds in day, UTT (NOT local time).
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* @return The offset in milliseconds to add to GMT to get local time.
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*/
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virtual t_int32 getOffset(t_uint8 era, t_int32 year, t_int32 month, t_int32 day,
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t_uint8 dayOfWeek, t_int32 millis) const = 0;
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/**
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* Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
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* to GMT to get local time, before taking daylight savings time into account).
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*
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* @param offsetMillis The new raw GMT offset for this time zone.
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*/
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virtual void setRawOffset(t_int32 offsetMillis) = 0;
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/**
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* Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
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* to GMT to get local time, before taking daylight savings time into account).
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*
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* @return The TimeZone's raw GMT offset.
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*/
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virtual t_int32 getRawOffset() const = 0;
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/**
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* Fills in "ID" with the TimeZone's ID.
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*
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* @param ID Receives this TimeZone's ID.
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* @return "ID"
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*/
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UnicodeString& getID(UnicodeString& ID) const;
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/**
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* Sets the TimeZone's ID to the specified value. This doesn't affect any other
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* fields (for example, if you say<
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* blockquote><pre>
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* . TimeZone* foo = TimeZone::createTimeZone("America/New_York");
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* . foo.setID("America/Los_Angeles");
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* </pre></blockquote>
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* the time zone's GMT offset and daylight-savings rules don't change to those for
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* Los Angeles. They're still those for New York. Only the ID has changed.)
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*
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* @param ID The new timezone ID.
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*/
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void setID(const UnicodeString& ID);
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/**
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* Queries if this TimeZone uses Daylight Savings Time.
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*
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* @return True if this TimeZone uses Daylight Savings Time; false otherwise.
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*/
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virtual t_bool useDaylightTime() const = 0;
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/**
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* Returns true if the given date is within the period when daylight savings time
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* is in effect; false otherwise. If the TimeZone doesn't observe daylight savings
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* time, this functions always returns false.
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* @param date The date to test.
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* @return true if the given date is in Daylight Savings Time;
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* false otherwise.
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*/
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virtual t_bool inDaylightTime(Date date, ErrorCode& status) const = 0;
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/**
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* Clones TimeZone objects polymorphically. Clients are responsible for deleting
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* the TimeZone object cloned.
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*
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* @return A new copy of this TimeZone object.
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*/
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virtual TimeZone* clone() const = 0;
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/**
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* Returns a unique class ID POLYMORPHICALLY. Pure virtual method. This method is to
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* implement a simple version of RTTI, since not all C++ compilers support genuine
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* RTTI. Polymorphic operator==() and clone() methods call this method.
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* <P>
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* Concrete subclasses of TimeZone must implement getDynamicClassID() and also a
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* static method and data member:
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* <pre>
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* . static ClassID getStaticClassID() { return (ClassID)&fgClassID; }
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* . static char fgClassID;
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* </pre>
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* @return The class ID for this object. All objects of a given class have the
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* same class ID. Objects of other classes have different class IDs.
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*/
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virtual ClassID getDynamicClassID() const = 0;
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/**
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* Netscape Extension for library termination
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*/
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static void terminateLibrary(void);
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protected:
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/**
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* Default constructor. ID is initialized to the empty string.
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*/
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TimeZone();
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/**
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* Copy constructor.
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*/
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TimeZone(const TimeZone& source);
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/**
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* Default assignment operator.
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*/
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TimeZone& operator=(const TimeZone& right);
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private:
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/**
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* Convert a non-localized string to an integer using a system function. Return a
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* failing ErrorCode status if all characters are not parsed.
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*/
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// static t_int32 stringToInteger(const UnicodeString& string, ErrorCode& status);
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/**
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* Delete function for fgHashtable.
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*/
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static void deleteTimeZone(void*);
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static Hashtable* fgHashtable; // hash table of objects in kSystemTimeZones,
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// maps zone ID to TimeZone object (lazy evaluated)
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static TimeZone* fgDefaultZone; // default time zone (lazy evaluated)
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static UnicodeString* fgAvailableIDs; // array containing all the IDs in kSystemTimeZones
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static t_int32 fgAvailableIDsCount; // number of IDs in fgAvailableIDs
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static UnicodeString kLastResortID; // ID of time zone to use as default if we can't
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// get a default from the system
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/**
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* Return a reference to the static Hashtable of registered TimeZone
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* objects. Performs initialization if necessary.
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* <P>
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* This method is also responsible for initializing the array
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* fgAvailableIDs and fgAvailableIDsCount.
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*/
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static const Hashtable& getHashtable();
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/**
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* Responsible for setting up fgDefaultZone. Uses routines in TPlatformUtilities
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* (i.e., platform-specific calls) to get the current system time zone. Failing
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* that, uses the platform-specific default time zone. Failing that, uses the time
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* zone specified by kLastResortID.
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*/
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static void initDefault();
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static SimpleTimeZone kSystemTimeZones[]; // an array of TimeZone objects for
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// all possible time zones in
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// use around the world as of 1997.
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static const int kSystemTimeZonesCount; // number of TimeZones in kSystemTimeZones.
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static const t_int32 millisPerHour; // number of milliseconds in an hour
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static const char* compatibilityMap[]; // maps old-style 3-letter time zone IDs
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// to the new region/city form (e.g., maps
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// "PST" to "America/Los_Angeles")
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static const int compatibilityMapCount; // number of entries in compatibilityMap.
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UnicodeString fID; // this time zone's ID
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};
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#ifdef NLS_MAC
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#pragma export off
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#endif
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// -------------------------------------
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inline UnicodeString&
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TimeZone::getID(UnicodeString& ID) const
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{
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ID = fID;
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return ID;
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}
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// -------------------------------------
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inline void
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TimeZone::setID(const UnicodeString& ID)
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{
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fID = ID;
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}
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#endif //_TIMEZONE
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//eof
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