444 lines
20 KiB
C++
444 lines
20 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2007-2009, 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 VTZONE_H
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#define VTZONE_H
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#include "unicode/utypes.h"
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/**
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* \file
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* \brief C++ API: RFC2445 VTIMEZONE support
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*/
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/basictz.h"
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U_NAMESPACE_BEGIN
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class VTZWriter;
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class VTZReader;
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class UVector;
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/**
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* <code>VTimeZone</code> is a class implementing RFC2445 VTIMEZONE. You can create a
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* <code>VTimeZone</code> instance from a time zone ID supported by <code>TimeZone</code>.
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* With the <code>VTimeZone</code> instance created from the ID, you can write out the rule
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* in RFC2445 VTIMEZONE format. Also, you can create a <code>VTimeZone</code> instance
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* from RFC2445 VTIMEZONE data stream, which allows you to calculate time
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* zone offset by the rules defined by the data.<br><br>
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* Note: The consumer of this class reading or writing VTIMEZONE data is responsible to
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* decode or encode Non-ASCII text. Methods reading/writing VTIMEZONE data in this class
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* do nothing with MIME encoding.
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* @stable ICU 3.8
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*/
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class U_I18N_API VTimeZone : public BasicTimeZone {
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public:
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/**
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* Copy constructor.
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* @param source The <code>VTimeZone</code> object to be copied.
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* @stable ICU 3.8
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*/
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VTimeZone(const VTimeZone& 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 ~VTimeZone();
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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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VTimeZone& operator=(const VTimeZone& 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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* Create a <code>VTimeZone</code> instance by the time zone ID.
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* @param ID The time zone ID, such as America/New_York
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* @return A <code>VTimeZone</code> object initialized by the time zone ID,
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* or NULL when the ID is unknown.
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* @stable ICU 3.8
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*/
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static VTimeZone* createVTimeZoneByID(const UnicodeString& ID);
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/**
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* Create a <code>VTimeZone</code> instance by RFC2445 VTIMEZONE data
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*
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* @param vtzdata The string including VTIMEZONE data block
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* @param status Output param to filled in with a success or an error.
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* @return A <code>VTimeZone</code> initialized by the VTIMEZONE data or
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* NULL if failed to load the rule from the VTIMEZONE data.
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* @stable ICU 3.8
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*/
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static VTimeZone* createVTimeZone(const UnicodeString& vtzdata, UErrorCode& status);
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/**
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* Gets the RFC2445 TZURL property value. When a <code>VTimeZone</code> instance was
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* created from VTIMEZONE data, the initial value is set by the TZURL property value
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* in the data. Otherwise, the initial value is not set.
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* @param url Receives the RFC2445 TZURL property value.
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* @return TRUE if TZURL attribute is available and value is set.
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* @stable ICU 3.8
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*/
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UBool getTZURL(UnicodeString& url) const;
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/**
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* Sets the RFC2445 TZURL property value.
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* @param url The TZURL property value.
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* @stable ICU 3.8
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*/
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void setTZURL(const UnicodeString& url);
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/**
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* Gets the RFC2445 LAST-MODIFIED property value. When a <code>VTimeZone</code> instance
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* was created from VTIMEZONE data, the initial value is set by the LAST-MODIFIED property
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* value in the data. Otherwise, the initial value is not set.
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* @param lastModified Receives the last modified date.
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* @return TRUE if lastModified attribute is available and value is set.
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* @stable ICU 3.8
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*/
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UBool getLastModified(UDate& lastModified) const;
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/**
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* Sets the RFC2445 LAST-MODIFIED property value.
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* @param lastModified The LAST-MODIFIED date.
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* @stable ICU 3.8
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*/
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void setLastModified(UDate lastModified);
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/**
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* Writes RFC2445 VTIMEZONE data for this time zone
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* @param result Output param to filled in with the VTIMEZONE data.
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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 write(UnicodeString& result, UErrorCode& status) const;
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/**
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* Writes RFC2445 VTIMEZONE data for this time zone applicalbe
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* for dates after the specified start time.
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* @param start The start date.
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* @param result Output param to filled in with the VTIMEZONE data.
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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 write(UDate start, UnicodeString& result, UErrorCode& status) /*const*/;
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/**
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* Writes RFC2445 VTIMEZONE data applicalbe for the specified date.
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* Some common iCalendar implementations can only handle a single time
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* zone property or a pair of standard and daylight time properties using
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* BYDAY rule with day of week (such as BYDAY=1SUN). This method produce
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* the VTIMEZONE data which can be handled these implementations. The rules
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* produced by this method can be used only for calculating time zone offset
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* around the specified date.
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* @param time The date used for rule extraction.
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* @param result Output param to filled in with the VTIMEZONE data.
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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 writeSimple(UDate time, UnicodeString& result, UErrorCode& status) /*const*/;
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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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* @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 TimeZone* clone(void) 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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/**
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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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/**
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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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private:
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enum { DEFAULT_VTIMEZONE_LINES = 100 };
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/**
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* Default constructor.
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*/
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VTimeZone();
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static VTimeZone* createVTimeZone(VTZReader* reader);
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void write(VTZWriter& writer, UErrorCode& status) const;
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void write(UDate start, VTZWriter& writer, UErrorCode& status) /*const*/;
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void writeSimple(UDate time, VTZWriter& writer, UErrorCode& status) /*const*/;
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void load(VTZReader& reader, UErrorCode& status);
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void parse(UErrorCode& status);
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void writeZone(VTZWriter& w, BasicTimeZone& basictz, UVector* customProps,
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UErrorCode& status) const;
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void writeHeaders(VTZWriter& w, UErrorCode& status) const;
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void writeFooter(VTZWriter& writer, UErrorCode& status) const;
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void writeZonePropsByTime(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
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int32_t fromOffset, int32_t toOffset, UDate time, UBool withRDATE,
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UErrorCode& status) const;
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void writeZonePropsByDOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
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int32_t fromOffset, int32_t toOffset,
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int32_t month, int32_t dayOfMonth, UDate startTime, UDate untilTime,
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UErrorCode& status) const;
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void writeZonePropsByDOW(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
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int32_t fromOffset, int32_t toOffset,
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int32_t month, int32_t weekInMonth, int32_t dayOfWeek,
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UDate startTime, UDate untilTime, UErrorCode& status) const;
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void writeZonePropsByDOW_GEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
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int32_t fromOffset, int32_t toOffset,
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int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
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UDate startTime, UDate untilTime, UErrorCode& status) const;
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void writeZonePropsByDOW_GEQ_DOM_sub(VTZWriter& writer, int32_t month, int32_t dayOfMonth,
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int32_t dayOfWeek, int32_t numDays,
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UDate untilTime, int32_t fromOffset, UErrorCode& status) const;
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void writeZonePropsByDOW_LEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
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int32_t fromOffset, int32_t toOffset,
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int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
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UDate startTime, UDate untilTime, UErrorCode& status) const;
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void writeFinalRule(VTZWriter& writer, UBool isDst, const AnnualTimeZoneRule* rule,
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int32_t fromRawOffset, int32_t fromDSTSavings,
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UDate startTime, UErrorCode& status) const;
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void beginZoneProps(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
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int32_t fromOffset, int32_t toOffset, UDate startTime, UErrorCode& status) const;
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void endZoneProps(VTZWriter& writer, UBool isDst, UErrorCode& status) const;
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void beginRRULE(VTZWriter& writer, int32_t month, UErrorCode& status) const;
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void appendUNTIL(VTZWriter& writer, const UnicodeString& until, UErrorCode& status) const;
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BasicTimeZone *tz;
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UVector *vtzlines;
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UnicodeString tzurl;
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UDate lastmod;
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UnicodeString olsonzid;
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UnicodeString icutzver;
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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 // VTZONE_H
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//eof
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