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215 lines
8.7 KiB
215 lines
8.7 KiB
9 years ago
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/*
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*******************************************************************************
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* Copyright (C) 2007-2013, 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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#ifndef BASICTZ_H
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#define BASICTZ_H
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/**
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* \file
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* \brief C++ API: ICU TimeZone base class
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/timezone.h"
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#include "unicode/tzrule.h"
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#include "unicode/tztrans.h"
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U_NAMESPACE_BEGIN
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// forward declarations
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class UVector;
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/**
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* <code>BasicTimeZone</code> is an abstract class extending <code>TimeZone</code>.
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* This class provides some additional methods to access time zone transitions and rules.
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* All ICU <code>TimeZone</code> concrete subclasses extend this class.
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* @stable ICU 3.8
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*/
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class U_I18N_API BasicTimeZone: public TimeZone {
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public:
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/**
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* Destructor.
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* @stable ICU 3.8
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*/
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virtual ~BasicTimeZone();
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/**
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* Gets the first time zone transition after the base time.
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* @param base The base time.
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* @param inclusive Whether the base time is inclusive or not.
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* @param result Receives the first transition after the base time.
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* @return TRUE if the transition is found.
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* @stable ICU 3.8
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*/
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virtual UBool getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const = 0;
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/**
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* Gets the most recent time zone transition before the base time.
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* @param base The base time.
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* @param inclusive Whether the base time is inclusive or not.
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* @param result Receives the most recent transition before the base time.
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* @return TRUE if the transition is found.
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* @stable ICU 3.8
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*/
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virtual UBool getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const = 0;
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/**
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* Checks if the time zone has equivalent transitions in the time range.
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* This method returns true when all of transition times, from/to standard
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* offsets and DST savings used by this time zone match the other in the
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* time range.
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* @param tz The <code>BasicTimeZone</code> object to be compared with.
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* @param start The start time of the evaluated time range (inclusive)
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* @param end The end time of the evaluated time range (inclusive)
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* @param ignoreDstAmount
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* When true, any transitions with only daylight saving amount
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* changes will be ignored, except either of them is zero.
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* For example, a transition from rawoffset 3:00/dstsavings 1:00
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* to rawoffset 2:00/dstsavings 2:00 is excluded from the comparison,
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* but a transtion from rawoffset 2:00/dstsavings 1:00 to
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* rawoffset 3:00/dstsavings 0:00 is included.
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* @param ec Output param to filled in with a success or an error.
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* @return true if the other time zone has the equivalent transitions in the
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* time range.
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* @stable ICU 3.8
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*/
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virtual UBool hasEquivalentTransitions(const BasicTimeZone& tz, UDate start, UDate end,
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UBool ignoreDstAmount, UErrorCode& ec) const;
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/**
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* Returns the number of <code>TimeZoneRule</code>s which represents time transitions,
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* for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except
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* <code>InitialTimeZoneRule</code>. The return value range is 0 or any positive value.
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* @param status Receives error status code.
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* @return The number of <code>TimeZoneRule</code>s representing time transitions.
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* @stable ICU 3.8
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*/
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virtual int32_t countTransitionRules(UErrorCode& status) const = 0;
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/**
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* Gets the <code>InitialTimeZoneRule</code> and the set of <code>TimeZoneRule</code>
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* which represent time transitions for this time zone. On successful return,
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* the argument initial points to non-NULL <code>InitialTimeZoneRule</code> and
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* the array trsrules is filled with 0 or multiple <code>TimeZoneRule</code>
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* instances up to the size specified by trscount. The results are referencing the
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* rule instance held by this time zone instance. Therefore, after this time zone
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* is destructed, they are no longer available.
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* @param initial Receives the initial timezone rule
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* @param trsrules Receives the timezone transition rules
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* @param trscount On input, specify the size of the array 'transitions' receiving
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* the timezone transition rules. On output, actual number of
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* rules filled in the array will be set.
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* @param status Receives error status code.
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* @stable ICU 3.8
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*/
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virtual void getTimeZoneRules(const InitialTimeZoneRule*& initial,
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const TimeZoneRule* trsrules[], int32_t& trscount, UErrorCode& status) const = 0;
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/**
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* Gets the set of time zone rules valid at the specified time. Some known external time zone
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* implementations are not capable to handle historic time zone rule changes. Also some
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* implementations can only handle certain type of rule definitions.
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* If this time zone does not use any daylight saving time within about 1 year from the specified
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* time, only the <code>InitialTimeZone</code> is returned. Otherwise, the rule for standard
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* time and daylight saving time transitions are returned in addition to the
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* <code>InitialTimeZoneRule</code>. The standard and daylight saving time transition rules are
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* represented by <code>AnnualTimeZoneRule</code> with <code>DateTimeRule::DOW</code> for its date
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* rule and <code>DateTimeRule::WALL_TIME</code> for its time rule. Because daylight saving time
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* rule is changing time to time in many time zones and also mapping a transition time rule to
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* different type is lossy transformation, the set of rules returned by this method may be valid
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* for short period of time.
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* The time zone rule objects returned by this method is owned by the caller, so the caller is
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* responsible for deleting them after use.
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* @param date The date used for extracting time zone rules.
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* @param initial Receives the <code>InitialTimeZone</code>, always not NULL.
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* @param std Receives the <code>AnnualTimeZoneRule</code> for standard time transitions.
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* When this time time zone does not observe daylight saving times around the
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* specified date, NULL is set.
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* @param dst Receives the <code>AnnualTimeZoneRule</code> for daylight saving time
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* transitions. When this time zone does not observer daylight saving times
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* around the specified date, NULL is set.
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* @param status Receives error status code.
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* @stable ICU 3.8
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*/
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virtual void getSimpleRulesNear(UDate date, InitialTimeZoneRule*& initial,
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AnnualTimeZoneRule*& std, AnnualTimeZoneRule*& dst, UErrorCode& status) const;
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#ifndef U_HIDE_INTERNAL_API
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/**
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* The time type option bit flags used by getOffsetFromLocal
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* @internal
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*/
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enum {
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kStandard = 0x01,
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kDaylight = 0x03,
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kFormer = 0x04,
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kLatter = 0x0C
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};
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#endif /* U_HIDE_INTERNAL_API */
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/**
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* Get time zone offsets from local wall time.
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* @internal
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*/
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virtual void getOffsetFromLocal(UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt,
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int32_t& rawOffset, int32_t& dstOffset, UErrorCode& status) const;
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protected:
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#ifndef U_HIDE_INTERNAL_API
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/**
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* The time type option bit masks used by getOffsetFromLocal
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* @internal
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*/
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enum {
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kStdDstMask = kDaylight,
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kFormerLatterMask = kLatter
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};
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#endif /* U_HIDE_INTERNAL_API */
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/**
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* Default constructor.
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* @stable ICU 3.8
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*/
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BasicTimeZone();
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/**
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* Construct a timezone with a given ID.
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* @param id a system time zone ID
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* @stable ICU 3.8
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*/
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BasicTimeZone(const UnicodeString &id);
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/**
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* Copy constructor.
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* @param source the object to be copied.
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* @stable ICU 3.8
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*/
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BasicTimeZone(const BasicTimeZone& source);
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/**
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* Gets the set of TimeZoneRule instances applicable to the specified time and after.
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* @param start The start date used for extracting time zone rules
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* @param initial Receives the InitialTimeZone, always not NULL
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* @param transitionRules Receives the transition rules, could be NULL
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* @param status Receives error status code
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*/
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void getTimeZoneRulesAfter(UDate start, InitialTimeZoneRule*& initial, UVector*& transitionRules,
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UErrorCode& status) const;
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};
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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#endif // BASICTZ_H
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//eof
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