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Diffstat (limited to 'intl/icu/source/i18n/unicode/basictz.h')
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diff --git a/intl/icu/source/i18n/unicode/basictz.h b/intl/icu/source/i18n/unicode/basictz.h new file mode 100644 index 0000000000..4f8e4cacb1 --- /dev/null +++ b/intl/icu/source/i18n/unicode/basictz.h @@ -0,0 +1,248 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +******************************************************************************* +* Copyright (C) 2007-2013, International Business Machines Corporation and +* others. All Rights Reserved. +******************************************************************************* +*/ +#ifndef BASICTZ_H +#define BASICTZ_H + +/** + * \file + * \brief C++ API: ICU TimeZone base class + */ + +#include "unicode/utypes.h" + +#if U_SHOW_CPLUSPLUS_API + +#if !UCONFIG_NO_FORMATTING + +#include "unicode/timezone.h" +#include "unicode/tzrule.h" +#include "unicode/tztrans.h" + +U_NAMESPACE_BEGIN + +// forward declarations +class UVector; + +/** + * <code>BasicTimeZone</code> is an abstract class extending <code>TimeZone</code>. + * This class provides some additional methods to access time zone transitions and rules. + * All ICU <code>TimeZone</code> concrete subclasses extend this class. + * @stable ICU 3.8 + */ +class U_I18N_API BasicTimeZone: public TimeZone { +public: + /** + * Destructor. + * @stable ICU 3.8 + */ + virtual ~BasicTimeZone(); + + /** + * Clones this object polymorphically. + * The caller owns the result and should delete it when done. + * @return clone, or nullptr if an error occurred + * @stable ICU 3.8 + */ + virtual BasicTimeZone* clone() const override = 0; + + /** + * Gets the first time zone transition after the base time. + * @param base The base time. + * @param inclusive Whether the base time is inclusive or not. + * @param result Receives the first transition after the base time. + * @return true if the transition is found. + * @stable ICU 3.8 + */ + virtual UBool getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const = 0; + + /** + * Gets the most recent time zone transition before the base time. + * @param base The base time. + * @param inclusive Whether the base time is inclusive or not. + * @param result Receives the most recent transition before the base time. + * @return true if the transition is found. + * @stable ICU 3.8 + */ + virtual UBool getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const = 0; + + /** + * Checks if the time zone has equivalent transitions in the time range. + * This method returns true when all of transition times, from/to standard + * offsets and DST savings used by this time zone match the other in the + * time range. + * @param tz The <code>BasicTimeZone</code> object to be compared with. + * @param start The start time of the evaluated time range (inclusive) + * @param end The end time of the evaluated time range (inclusive) + * @param ignoreDstAmount + * When true, any transitions with only daylight saving amount + * changes will be ignored, except either of them is zero. + * For example, a transition from rawoffset 3:00/dstsavings 1:00 + * to rawoffset 2:00/dstsavings 2:00 is excluded from the comparison, + * but a transition from rawoffset 2:00/dstsavings 1:00 to + * rawoffset 3:00/dstsavings 0:00 is included. + * @param ec Output param to filled in with a success or an error. + * @return true if the other time zone has the equivalent transitions in the + * time range. + * @stable ICU 3.8 + */ + virtual UBool hasEquivalentTransitions(const BasicTimeZone& tz, UDate start, UDate end, + UBool ignoreDstAmount, UErrorCode& ec) const; + + /** + * Returns the number of <code>TimeZoneRule</code>s which represents time transitions, + * for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except + * <code>InitialTimeZoneRule</code>. The return value range is 0 or any positive value. + * @param status Receives error status code. + * @return The number of <code>TimeZoneRule</code>s representing time transitions. + * @stable ICU 3.8 + */ + virtual int32_t countTransitionRules(UErrorCode& status) const = 0; + + /** + * Gets the <code>InitialTimeZoneRule</code> and the set of <code>TimeZoneRule</code> + * which represent time transitions for this time zone. On successful return, + * the argument initial points to non-nullptr <code>InitialTimeZoneRule</code> and + * the array trsrules is filled with 0 or multiple <code>TimeZoneRule</code> + * instances up to the size specified by trscount. The results are referencing the + * rule instance held by this time zone instance. Therefore, after this time zone + * is destructed, they are no longer available. + * @param initial Receives the initial timezone rule + * @param trsrules Receives the timezone transition rules + * @param trscount On input, specify the size of the array 'transitions' receiving + * the timezone transition rules. On output, actual number of + * rules filled in the array will be set. + * @param status Receives error status code. + * @stable ICU 3.8 + */ + virtual void getTimeZoneRules(const InitialTimeZoneRule*& initial, + const TimeZoneRule* trsrules[], int32_t& trscount, UErrorCode& status) const = 0; + + /** + * Gets the set of time zone rules valid at the specified time. Some known external time zone + * implementations are not capable to handle historic time zone rule changes. Also some + * implementations can only handle certain type of rule definitions. + * If this time zone does not use any daylight saving time within about 1 year from the specified + * time, only the <code>InitialTimeZone</code> is returned. Otherwise, the rule for standard + * time and daylight saving time transitions are returned in addition to the + * <code>InitialTimeZoneRule</code>. The standard and daylight saving time transition rules are + * represented by <code>AnnualTimeZoneRule</code> with <code>DateTimeRule::DOW</code> for its date + * rule and <code>DateTimeRule::WALL_TIME</code> for its time rule. Because daylight saving time + * rule is changing time to time in many time zones and also mapping a transition time rule to + * different type is lossy transformation, the set of rules returned by this method may be valid + * for short period of time. + * The time zone rule objects returned by this method is owned by the caller, so the caller is + * responsible for deleting them after use. + * @param date The date used for extracting time zone rules. + * @param initial Receives the <code>InitialTimeZone</code>, always not nullptr. + * @param std Receives the <code>AnnualTimeZoneRule</code> for standard time transitions. + * When this time time zone does not observe daylight saving times around the + * specified date, nullptr is set. + * @param dst Receives the <code>AnnualTimeZoneRule</code> for daylight saving time + * transitions. When this time zone does not observer daylight saving times + * around the specified date, nullptr is set. + * @param status Receives error status code. + * @stable ICU 3.8 + */ + virtual void getSimpleRulesNear(UDate date, InitialTimeZoneRule*& initial, + AnnualTimeZoneRule*& std, AnnualTimeZoneRule*& dst, UErrorCode& status) const; + + /** + * Get time zone offsets from local wall time. + * @stable ICU 69 + */ + virtual void getOffsetFromLocal( + UDate date, UTimeZoneLocalOption nonExistingTimeOpt, + UTimeZoneLocalOption duplicatedTimeOpt, int32_t& rawOffset, + int32_t& dstOffset, UErrorCode& status) const; + + +#ifndef U_HIDE_INTERNAL_API + /** + * The time type option bit flags used by getOffsetFromLocal + * @internal + */ + enum { + kStandard = 0x01, + kDaylight = 0x03, + kFormer = 0x04, /* UCAL_TZ_LOCAL_FORMER */ + kLatter = 0x0C /* UCAL_TZ_LOCAL_LATTER */ + }; + + /** + * Get time zone offsets from local wall time. + * @internal + */ + void getOffsetFromLocal(UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt, + int32_t& rawOffset, int32_t& dstOffset, UErrorCode& status) const; +#endif /* U_HIDE_INTERNAL_API */ + +protected: + +#ifndef U_HIDE_INTERNAL_API + /** + * A time type option bit mask used by getOffsetFromLocal. + * @internal + */ + static constexpr int32_t kStdDstMask = kDaylight; + /** + * A time type option bit mask used by getOffsetFromLocal. + * @internal + */ + static constexpr int32_t kFormerLatterMask = kLatter; +#endif /* U_HIDE_INTERNAL_API */ + + /** + * Default constructor. + * @stable ICU 3.8 + */ + BasicTimeZone(); + + /** + * Construct a timezone with a given ID. + * @param id a system time zone ID + * @stable ICU 3.8 + */ + BasicTimeZone(const UnicodeString &id); + + /** + * Copy constructor. + * @param source the object to be copied. + * @stable ICU 3.8 + */ + BasicTimeZone(const BasicTimeZone& source); + + /** + * Copy assignment. + * @stable ICU 3.8 + */ + BasicTimeZone& operator=(const BasicTimeZone&) = default; + + /** + * Gets the set of TimeZoneRule instances applicable to the specified time and after. + * @param start The start date used for extracting time zone rules + * @param initial Output parameter, receives the InitialTimeZone. + * Always not nullptr (except in case of error) + * @param transitionRules Output parameter, a UVector of transition rules. + * May be nullptr, if there are no transition rules. + * The caller owns the returned vector; the UVector owns the rules. + * @param status Receives error status code + */ + void getTimeZoneRulesAfter(UDate start, InitialTimeZoneRule*& initial, UVector*& transitionRules, + UErrorCode& status) const; +}; + +U_NAMESPACE_END + +#endif /* #if !UCONFIG_NO_FORMATTING */ + +#endif /* U_SHOW_CPLUSPLUS_API */ + +#endif // BASICTZ_H + +//eof |