// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2009-2016, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/
/**
* \file
* \brief C API: RFC2445 VTIMEZONE support
*
* <p>This is a C wrapper around the C++ VTimeZone class.</p>
*/
#ifndef __VZONE_H
#define __VZONE_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
#include "unicode/uobject.h"
#include "ztrans.h"
#ifndef UCNV_H
struct VZone;
/**
* A UnicodeSet. Use the vzone_* API to manipulate. Create with
* vzone_open*, and destroy with vzone_close.
*/
typedef struct VZone VZone;
#endif
/*********************************************************************
* VZone API
*********************************************************************/
/**
* Creates a vzone from the given time zone ID.
* @param ID The time zone ID, such as America/New_York
* @param idLength, length of the ID parameter
* @return A vzone object initialized by the time zone ID,
* or NULL when the ID is unknown.
*/
U_CAPI VZone* U_EXPORT2
vzone_openID(const UChar* ID, int32_t idLength);
/**
* Create a vzone instance by RFC2445 VTIMEZONE data
* @param vtzdata The string including VTIMEZONE data block
* @param vtzdataLength, length of the vtzdata
* @param status Output param to filled in with a success or an error.
* @return A vzone initialized by the VTIMEZONE data or
* NULL if failed to load the rule from the VTIMEZONE data.
*/
U_CAPI VZone* U_EXPORT2
vzone_openData(const UChar* vtzdata, int32_t vtzdataLength, UErrorCode& status);
/**
* Disposes of the storage used by a VZone object. This function should
* be called exactly once for objects returned by vzone_open*.
* @param set the object to dispose of
*/
U_CAPI void U_EXPORT2
vzone_close(VZone* zone);
/**
* Returns a copy of this object.
* @param zone the original vzone
* @return the newly allocated copy of the vzone
*/
U_CAPI VZone* U_EXPORT2
vzone_clone(const VZone *zone);
/**
* Returns true if zone1 is identical to zone2
* and vis versa.
* @param zone1 to be checked for containment
* @param zone2 to be checked for containment
* @return true if the test condition is met
*/
U_CAPI UBool U_EXPORT2
vzone_equals(const VZone* zone1, const VZone* zone2);
/**
* Gets the RFC2445 TZURL property value. When a vzone instance was
* created from VTIMEZONE data, the initial value is set by the TZURL
* property value in the data. Otherwise, the initial value is not set.
* @param zone, the vzone to use
* @param url Receives the RFC2445 TZURL property value.
* @param urlLength, length of the url
* @return TRUE if TZURL attribute is available and value is set.
*/
U_CAPI UBool U_EXPORT2
vzone_getTZURL(VZone* zone, UChar* & url, int32_t & urlLength);
/**
* Sets the RFC2445 TZURL property value.
* @param zone, the vzone to use
* @param url The TZURL property value.
* @param urlLength, length of the url
*/
U_CAPI void U_EXPORT2
vzone_setTZURL(VZone* zone, UChar* url, int32_t urlLength);
/**
* Gets the RFC2445 LAST-MODIFIED property value. When a vzone instance
* was created from VTIMEZONE data, the initial value is set by the
* LAST-MODIFIED property value in the data. Otherwise, the initial value
* is not set.
* @param zone, the vzone to use
* @param lastModified Receives the last modified date.
* @return TRUE if lastModified attribute is available and value is set.
*/
U_CAPI UBool U_EXPORT2
vzone_getLastModified(VZone* zone, UDate& lastModified);
/**
* Sets the RFC2445 LAST-MODIFIED property value.
* @param zone, the vzone to use
* @param lastModified The LAST-MODIFIED date.
*/
U_CAPI void U_EXPORT2
vzone_setLastModified(VZone* zone, UDate lastModified);
/**
* Writes RFC2445 VTIMEZONE data for this time zone
* @param zone, the vzone to use
* @param result Output param to filled in with the VTIMEZONE data.
* @param resultLength, length of the result output
* @param status Output param to filled in with a success or an error.
*/
U_CAPI void U_EXPORT2
vzone_write(VZone* zone, UChar* & result, int32_t & resultLength, UErrorCode& status);
/**
* Writes RFC2445 VTIMEZONE data for this time zone applicalbe
* for dates after the specified start time.
* @param zone, the vzone to use
* @param start The start date.
* @param result Output param to filled in with the VTIMEZONE data.
* @param resultLength, length of the result output
* @param status Output param to filled in with a success or an error.
*/
U_CAPI void U_EXPORT2
vzone_writeFromStart(VZone* zone, UDate start, UChar* & result, int32_t & resultLength, UErrorCode& status);
/**
* Writes RFC2445 VTIMEZONE data applicalbe for the specified date.
* Some common iCalendar implementations can only handle a single time
* zone property or a pair of standard and daylight time properties using
* BYDAY rule with day of week (such as BYDAY=1SUN). This method produce
* the VTIMEZONE data which can be handled these implementations. The rules
* produced by this method can be used only for calculating time zone offset
* around the specified date.
* @param zone, the vzone to use
* @param time The date used for rule extraction.
* @param result Output param to filled in with the VTIMEZONE data.
* @param status Output param to filled in with a success or an error.
*/
U_CAPI void U_EXPORT2
vzone_writeSimple(VZone* zone, UDate time, UChar* & result, int32_t & resultLength, UErrorCode& status);
/**
* Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add
* to GMT to get local time in this time zone, taking daylight savings time into
* account) as of a particular reference date. The reference date is used to determine
* whether daylight savings time is in effect and needs to be figured into the offset
* that is returned (in other words, what is the adjusted GMT offset in this time zone
* at this particular date and time?). For the time zones produced by createTimeZone(),
* the reference data is specified according to the Gregorian calendar, and the date
* and time fields are local standard time.
*
* <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload,
* which returns both the raw and the DST offset for a given time. This method
* is retained only for backward compatibility.
*
* @param zone, the vzone to use
* @param era The reference date's era
* @param year The reference date's year
* @param month The reference date's month (0-based; 0 is January)
* @param day The reference date's day-in-month (1-based)
* @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday)
* @param millis The reference date's milliseconds in day, local standard time
* @param status Output param to filled in with a success or an error.
* @return The offset in milliseconds to add to GMT to get local time.
*/
U_CAPI int32_t U_EXPORT2
vzone_getOffset(VZone* zone, uint8_t era, int32_t year, int32_t month, int32_t day,
uint8_t dayOfWeek, int32_t millis, UErrorCode& status);
/**
* Gets the time zone offset, for current date, modified in case of
* daylight savings. This is the offset to add *to* UTC to get local time.
*
* <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload,
* which returns both the raw and the DST offset for a given time. This method
* is retained only for backward compatibility.
*
* @param zone, the vzone to use
* @param era The reference date's era
* @param year The reference date's year
* @param month The reference date's month (0-based; 0 is January)
* @param day The reference date's day-in-month (1-based)
* @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday)
* @param millis The reference date's milliseconds in day, local standard time
* @param monthLength The length of the given month in days.
* @param status Output param to filled in with a success or an error.
* @return The offset in milliseconds to add to GMT to get local time.
*/
U_CAPI int32_t U_EXPORT2
vzone_getOffset2(VZone* zone, uint8_t era, int32_t year, int32_t month, int32_t day,
uint8_t dayOfWeek, int32_t millis,
int32_t monthLength, UErrorCode& status);
/**
* Returns the time zone raw and GMT offset for the given moment
* in time. Upon return, local-millis = GMT-millis + rawOffset +
* dstOffset. All computations are performed in the proleptic
* Gregorian calendar. The default implementation in the TimeZone
* class delegates to the 8-argument getOffset().
*
* @param zone, the vzone to use
* @param date moment in time for which to return offsets, in
* units of milliseconds from January 1, 1970 0:00 GMT, either GMT
* time or local wall time, depending on `local'.
* @param local if true, `date' is local wall time; otherwise it
* is in GMT time.
* @param rawOffset output parameter to receive the raw offset, that
* is, the offset not including DST adjustments
* @param dstOffset output parameter to receive the DST offset,
* that is, the offset to be added to `rawOffset' to obtain the
* total offset between local and GMT time. If DST is not in
* effect, this value is zero; otherwise it is a positive value,
* typically one hour.
* @param ec input-output error code
*/
U_CAPI void U_EXPORT2
vzone_getOffset3(VZone* zone, UDate date, UBool local, int32_t& rawOffset,
int32_t& dstOffset, UErrorCode& ec);
/**
* Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
* to GMT to get local time, before taking daylight savings time into account).
*
* @param zone, the vzone to use
* @param offsetMillis The new raw GMT offset for this time zone.
*/
U_CAPI void U_EXPORT2
vzone_setRawOffset(VZone* zone, int32_t offsetMillis);
/**
* Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
* to GMT to get local time, before taking daylight savings time into account).
*
* @param zone, the vzone to use
* @return The TimeZone's raw GMT offset.
*/
U_CAPI int32_t U_EXPORT2
vzone_getRawOffset(VZone* zone);
/**
* Queries if this time zone uses daylight savings time.
* @param zone, the vzone to use
* @return true if this time zone uses daylight savings time,
* false, otherwise.
*/
U_CAPI UBool U_EXPORT2
vzone_useDaylightTime(VZone* zone);
/**
* Queries if the given date is in daylight savings time in
* this time zone.
* This method is wasteful since it creates a new GregorianCalendar and
* deletes it each time it is called. This is a deprecated method
* and provided only for Java compatibility.
*
* @param zone, the vzone to use
* @param date the given UDate.
* @param status Output param filled in with success/error code.
* @return true if the given date is in daylight savings time,
* false, otherwise.
*/
U_INTERNAL UBool U_EXPORT2
vzone_inDaylightTime(VZone* zone, UDate date, UErrorCode& status);
/**
* Returns true if this zone has the same rule and offset as another zone.
* That is, if this zone differs only in ID, if at all.
* @param zone, the vzone to use
* @param other the <code>TimeZone</code> object to be compared with
* @return true if the given zone is the same as this one,
* with the possible exception of the ID
*/
U_CAPI UBool U_EXPORT2
vzone_hasSameRules(VZone* zone, const VZone* other);
/**
* Gets the first time zone transition after the base time.
* @param zone, the vzone to use
* @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.
*/
U_CAPI UBool U_EXPORT2
vzone_getNextTransition(VZone* zone, UDate base, UBool inclusive, ZTrans* result);
/**
* Gets the most recent time zone transition before the base time.
* @param zone, the vzone to use
* @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.
*/
U_CAPI UBool U_EXPORT2
vzone_getPreviousTransition(VZone* zone, UDate base, UBool inclusive, ZTrans* result);
/**
* 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 zone, the vzone to use
* @param status Receives error status code.
* @return The number of <code>TimeZoneRule</code>s representing time transitions.
*/
U_CAPI int32_t U_EXPORT2
vzone_countTransitionRules(VZone* zone, UErrorCode& status);
/**
* Return the class ID for this class. This is useful only for comparing to
* a return value from getDynamicClassID(). For example:
* <pre>
* . Base* polymorphic_pointer = createPolymorphicObject();
* . if (polymorphic_pointer->getDynamicClassID() ==
* . erived::getStaticClassID()) ...
* </pre>
* @param zone, the vzone to use
* @return The class ID for all objects of this class.
*/
U_CAPI UClassID U_EXPORT2
vzone_getStaticClassID(VZone* zone);
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
* method is to implement a simple version of RTTI, since not all C++
* compilers support genuine RTTI. Polymorphic operator==() and clone()
* methods call this method.
*
* @param zone, the vzone to use
* @return The class ID for this object. All objects of a
* given class have the same class ID. Objects of
* other classes have different class IDs.
*/
U_CAPI UClassID U_EXPORT2
vzone_getDynamicClassID(VZone* zone);
#endif // __VZONE_H
#endif