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371 lines
16 KiB
371 lines
16 KiB
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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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 RBTZ_H
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#define RBTZ_H
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#include "unicode/utypes.h"
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#if U_SHOW_CPLUSPLUS_API
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/**
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* \file
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* \brief C++ API: Rule based customizable time zone
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*/
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/basictz.h"
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#include "unicode/unistr.h"
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U_NAMESPACE_BEGIN
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// forward declaration
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class UVector;
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struct Transition;
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/**
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* a BasicTimeZone subclass implemented in terms of InitialTimeZoneRule and TimeZoneRule instances
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* @see BasicTimeZone
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* @see InitialTimeZoneRule
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* @see TimeZoneRule
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*/
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class U_I18N_API RuleBasedTimeZone : public BasicTimeZone {
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public:
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/**
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* Constructs a <code>RuleBasedTimeZone</code> object with the ID and the
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* <code>InitialTimeZoneRule</code>. The input <code>InitialTimeZoneRule</code>
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* is adopted by this <code>RuleBasedTimeZone</code>, thus the caller must not
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* delete it.
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* @param id The time zone ID.
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* @param initialRule The initial time zone rule.
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* @stable ICU 3.8
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*/
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RuleBasedTimeZone(const UnicodeString& id, InitialTimeZoneRule* initialRule);
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/**
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* Copy constructor.
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* @param source The RuleBasedTimeZone object to be copied.
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* @stable ICU 3.8
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*/
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RuleBasedTimeZone(const RuleBasedTimeZone& source);
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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 ~RuleBasedTimeZone();
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/**
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* Assignment operator.
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* @param right The object to be copied.
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* @stable ICU 3.8
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*/
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RuleBasedTimeZone& operator=(const RuleBasedTimeZone& right);
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/**
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* Return true if the given <code>TimeZone</code> objects are
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* semantically equal. Objects of different subclasses are considered unequal.
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* @param that The object to be compared with.
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* @return true if the given <code>TimeZone</code> objects are
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*semantically equal.
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* @stable ICU 3.8
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*/
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virtual UBool operator==(const TimeZone& that) const;
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/**
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* Return true if the given <code>TimeZone</code> objects are
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* semantically unequal. Objects of different subclasses are considered unequal.
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* @param that The object to be compared with.
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* @return true if the given <code>TimeZone</code> objects are
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* semantically unequal.
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* @stable ICU 3.8
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*/
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virtual UBool operator!=(const TimeZone& that) const;
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/**
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* Adds the <code>TimeZoneRule</code> which represents time transitions.
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* The <code>TimeZoneRule</code> must have start times, that is, the result
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* of isTransitionRule() must be true. Otherwise, U_ILLEGAL_ARGUMENT_ERROR
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* is set to the error code.
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* The input <code>TimeZoneRule</code> is adopted by this
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* <code>RuleBasedTimeZone</code> on successful completion of this method,
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* thus, the caller must not delete it when no error is returned.
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* After all rules are added, the caller must call complete() method to
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* make this <code>RuleBasedTimeZone</code> ready to handle common time
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* zone functions.
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* @param rule The <code>TimeZoneRule</code>.
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* @param status Output param to filled in with a success or an error.
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* @stable ICU 3.8
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*/
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void addTransitionRule(TimeZoneRule* rule, UErrorCode& status);
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/**
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* Makes the <code>TimeZoneRule</code> ready to handle actual timezone
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* calcuation APIs. This method collects time zone rules specified
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* by the caller via the constructor and addTransitionRule() and
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* builds internal structure for making the object ready to support
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* time zone APIs such as getOffset(), getNextTransition() and others.
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* @param status Output param to filled in with a success or an error.
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* @stable ICU 3.8
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*/
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void complete(UErrorCode& status);
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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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* @stable ICU 3.8
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*/
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virtual RuleBasedTimeZone* clone() const;
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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 local standard time.
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*
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* <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload,
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* which returns both the raw and the DST offset for a given time. This method
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* is retained only for backward compatibility.
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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, local standard time
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* @param status Output param to filled in with a success or an error.
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* @return The offset in milliseconds to add to GMT to get local time.
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* @stable ICU 3.8
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*/
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virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
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uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const;
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/**
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* Gets the time zone offset, for current date, modified in case of
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* daylight savings. This is the offset to add *to* UTC to get local time.
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*
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* <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload,
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* which returns both the raw and the DST offset for a given time. This method
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* is retained only for backward compatibility.
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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, local standard time
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* @param monthLength The length of the given month in days.
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* @param status Output param to filled in with a success or an error.
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* @return The offset in milliseconds to add to GMT to get local time.
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* @stable ICU 3.8
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*/
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virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
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uint8_t dayOfWeek, int32_t millis,
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int32_t monthLength, UErrorCode& status) const;
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/**
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* Returns the time zone raw and GMT offset for the given moment
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* in time. Upon return, local-millis = GMT-millis + rawOffset +
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* dstOffset. All computations are performed in the proleptic
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* Gregorian calendar. The default implementation in the TimeZone
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* class delegates to the 8-argument getOffset().
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*
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* @param date moment in time for which to return offsets, in
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* units of milliseconds from January 1, 1970 0:00 GMT, either GMT
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* time or local wall time, depending on `local'.
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* @param local if true, `date' is local wall time; otherwise it
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* is in GMT time.
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* @param rawOffset output parameter to receive the raw offset, that
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* is, the offset not including DST adjustments
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* @param dstOffset output parameter to receive the DST offset,
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* that is, the offset to be added to `rawOffset' to obtain the
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* total offset between local and GMT time. If DST is not in
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* effect, this value is zero; otherwise it is a positive value,
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* typically one hour.
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* @param ec input-output error code
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* @stable ICU 3.8
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*/
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virtual void getOffset(UDate date, UBool local, int32_t& rawOffset,
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int32_t& dstOffset, UErrorCode& ec) const;
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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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* @stable ICU 3.8
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*/
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virtual void setRawOffset(int32_t offsetMillis);
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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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* @stable ICU 3.8
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*/
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virtual int32_t getRawOffset(void) const;
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/**
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* Queries if this time zone uses daylight savings time.
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* @return true if this time zone uses daylight savings time,
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* false, otherwise.
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* @stable ICU 3.8
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*/
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virtual UBool useDaylightTime(void) const;
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#ifndef U_FORCE_HIDE_DEPRECATED_API
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/**
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* Queries if the given date is in daylight savings time in
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* this time zone.
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* This method is wasteful since it creates a new GregorianCalendar and
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* deletes it each time it is called. This is a deprecated method
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* and provided only for Java compatibility.
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*
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* @param date the given UDate.
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* @param status Output param filled in with success/error code.
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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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* @deprecated ICU 2.4. Use Calendar::inDaylightTime() instead.
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*/
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virtual UBool inDaylightTime(UDate date, UErrorCode& status) const;
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#endif // U_FORCE_HIDE_DEPRECATED_API
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/**
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* Returns true if this zone has the same rule and offset as another zone.
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* That is, if this zone differs only in ID, if at all.
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* @param other the <code>TimeZone</code> object to be compared with
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* @return true if the given zone is the same as this one,
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* with the possible exception of the ID
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* @stable ICU 3.8
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*/
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virtual UBool hasSameRules(const TimeZone& other) const;
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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;
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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;
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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;
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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;
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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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private:
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void deleteRules(void);
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void deleteTransitions(void);
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UVector* copyRules(UVector* source);
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TimeZoneRule* findRuleInFinal(UDate date, UBool local,
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int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const;
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UBool findNext(UDate base, UBool inclusive, UDate& time, TimeZoneRule*& from, TimeZoneRule*& to) const;
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UBool findPrev(UDate base, UBool inclusive, UDate& time, TimeZoneRule*& from, TimeZoneRule*& to) const;
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int32_t getLocalDelta(int32_t rawBefore, int32_t dstBefore, int32_t rawAfter, int32_t dstAfter,
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int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const;
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UDate getTransitionTime(Transition* transition, UBool local,
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int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const;
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void getOffsetInternal(UDate date, UBool local, int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt,
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int32_t& rawOffset, int32_t& dstOffset, UErrorCode& ec) const;
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void completeConst(UErrorCode &status) const;
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InitialTimeZoneRule *fInitialRule;
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UVector *fHistoricRules;
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UVector *fFinalRules;
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UVector *fHistoricTransitions;
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UBool fUpToDate;
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public:
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/**
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* Return the class ID for this class. This is useful only for comparing to
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* a return value from getDynamicClassID(). For example:
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* <pre>
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* . Base* polymorphic_pointer = createPolymorphicObject();
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* . if (polymorphic_pointer->getDynamicClassID() ==
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* . erived::getStaticClassID()) ...
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* </pre>
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* @return The class ID for all objects of this class.
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* @stable ICU 3.8
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*/
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static UClassID U_EXPORT2 getStaticClassID(void);
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/**
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* Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
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* method is to implement a simple version of RTTI, since not all C++
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* compilers support genuine RTTI. Polymorphic operator==() and clone()
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* methods call this method.
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*
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* @return The class ID for this object. All objects of a
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* given class have the same class ID. Objects of
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* other classes have different class IDs.
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* @stable ICU 3.8
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*/
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virtual UClassID getDynamicClassID(void) 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 /* U_SHOW_CPLUSPLUS_API */
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#endif // RBTZ_H
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//eof
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