The Tor Browser: intl/icu/source/i18n/olsontz.h@fc2d59ddac77 (annotated)

intl/icu/source/i18n/olsontz.h@fc2d59ddac77 (annotated)

intl/icu/source/i18n/olsontz.h

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /*
 **********************************************************************
 * Copyright (c) 2003-2013, International Business Machines
 * Corporation and others.  All Rights Reserved.
 **********************************************************************
 * Author: Alan Liu
 * Created: July 21 2003
 * Since: ICU 2.8
 **********************************************************************
 */
 #ifndef OLSONTZ_H
 #define OLSONTZ_H
 #include "unicode/utypes.h"
 #if !UCONFIG_NO_FORMATTING
 #include "unicode/basictz.h"
 #include "umutex.h"
 struct UResourceBundle;
 U_NAMESPACE_BEGIN
 class SimpleTimeZone;
 /**
  * A time zone based on the Olson tz database.  Olson time zones change
  * behavior over time.  The raw offset, rules, presence or absence of
  * daylight savings time, and even the daylight savings amount can all
  * vary.
  *
  * This class uses a resource bundle named "zoneinfo".  Zoneinfo is a
  * table containing different kinds of resources.  In several places,
  * zones are referred to using integers.  A zone's integer is a number
  * from 0..n-1, where n is the number of zones, with the zones sorted
  * in lexicographic order.
  *
  * 1. Zones.  These have keys corresponding to the Olson IDs, e.g.,
  * "Asia/Shanghai".  Each resource describes the behavior of the given
  * zone.  Zones come in two different formats.
  *
  *   a. Zone (table).  A zone is a table resource contains several
  *   type of resources below:
  *
  *   - typeOffsets:intvector (Required)
  *
  *   Sets of UTC raw/dst offset pairs in seconds.  Entries at
  *   2n represents raw offset and 2n+1 represents dst offset
  *   paired with the raw offset at 2n.  The very first pair represents
  *   the initial zone offset (before the first transition) always.
  *
  *   - trans:intvector (Optional)
  *
  *   List of transition times represented by 32bit seconds from the
  *   epoch (1970-01-01T00:00Z) in ascending order.
  *
  *   - transPre32/transPost32:intvector (Optional)
  *
  *   List of transition times before/after 32bit minimum seconds.
  *   Each time is represented by a pair of 32bit integer.
  *
  *   - typeMap:bin (Optional)
  *
  *   Array of bytes representing the mapping between each transition
  *   time (transPre32/trans/transPost32) and its corresponding offset
  *   data (typeOffsets).
  *
  *   - finalRule:string (Optional)
  *
  *   If a recurrent transition rule is applicable to a zone forever
  *   after the final transition time, finalRule represents the rule
  *   in Rules data.
  *
  *   - finalRaw:int (Optional)
  *
  *   When finalRule is available, finalRaw is required and specifies
  *   the raw (base) offset of the rule.
  *
  *   - finalYear:int (Optional)
  *
  *   When finalRule is available, finalYear is required and specifies
  *   the start year of the rule.
  *
  *   - links:intvector (Optional)
  *
  *   When this zone data is shared with other zones, links specifies
  *   all zones including the zone itself.  Each zone is referenced by
  *   integer index.
  *
  *  b. Link (int, length 1).  A link zone is an int resource.  The
  *  integer is the zone number of the target zone.  The key of this
  *  resource is an alternate name for the target zone.  This data
  *  is corresponding to Link data in the tz database.
  *
  *
  * 2. Rules.  These have keys corresponding to the Olson rule IDs,
  * with an underscore prepended, e.g., "_EU".  Each resource describes
  * the behavior of the given rule using an intvector, containing the
  * onset list, the cessation list, and the DST savings.  The onset and
  * cessation lists consist of the month, dowim, dow, time, and time
  * mode.  The end result is that the 11 integers describing the rule
  * can be passed directly into the SimpleTimeZone 13-argument
  * constructor (the other two arguments will be the raw offset, taken
  * from the complex zone element 5, and the ID string, which is not
  * used), with the times and the DST savings multiplied by 1000 to
  * scale from seconds to milliseconds.
  *
  * 3. Regions.  An array specifies mapping between zones and regions.
  * Each item is either a 2-letter ISO country code or "001"
  * (UN M.49 - World).  This data is generated from "zone.tab"
  * in the tz database.
  */
 class U_I18N_API OlsonTimeZone: public BasicTimeZone {
  public:
     /**
      * Construct from a resource bundle.
      * @param top the top-level zoneinfo resource bundle.  This is used
      * to lookup the rule that `res' may refer to, if there is one.
      * @param res the resource bundle of the zone to be constructed
      * @param tzid the time zone ID
      * @param ec input-output error code
      */
     OlsonTimeZone(const UResourceBundle* top,
                   const UResourceBundle* res,
                   const UnicodeString& tzid,
                   UErrorCode& ec);
     /**
      * Copy constructor
      */
     OlsonTimeZone(const OlsonTimeZone& other);
     /**
      * Destructor
      */
     virtual ~OlsonTimeZone();
     /**
      * Assignment operator
      */
     OlsonTimeZone& operator=(const OlsonTimeZone& other);
     /**
      * Returns true if the two TimeZone objects are equal.
      */
     virtual UBool operator==(const TimeZone& other) const;
     /**
      * TimeZone API.
      */
     virtual TimeZone* clone() const;
     /**
      * TimeZone API.
      */
     static UClassID U_EXPORT2 getStaticClassID();
     /**
      * TimeZone API.
      */
     virtual UClassID getDynamicClassID() const;
     /**
      * TimeZone API.  Do not call this; prefer getOffset(UDate,...).
      */
     virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month,
                               int32_t day, uint8_t dayOfWeek,
                               int32_t millis, UErrorCode& ec) const;
     /**
      * TimeZone API.  Do not call this; prefer getOffset(UDate,...).
      */
     virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month,
                               int32_t day, uint8_t dayOfWeek,
                               int32_t millis, int32_t monthLength,
                               UErrorCode& ec) const;
     /**
      * TimeZone API.
      */
     virtual void getOffset(UDate date, UBool local, int32_t& rawOffset,
                    int32_t& dstOffset, UErrorCode& ec) const;
     /**
      * BasicTimeZone API.
      */
     virtual void getOffsetFromLocal(UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt,
         int32_t& rawoff, int32_t& dstoff, UErrorCode& ec) const;
     /**
      * TimeZone API.  This method has no effect since objects of this
      * class are quasi-immutable (the base class allows the ID to be
      * changed).
      */
     virtual void setRawOffset(int32_t offsetMillis);
     /**
      * TimeZone API.  For a historical zone, the raw offset can change
      * over time, so this API is not useful.  In order to approximate
      * expected behavior, this method returns the raw offset for the
      * current moment in time.
      */
     virtual int32_t getRawOffset() const;
     /**
      * TimeZone API.  For a historical zone, whether DST is used or
      * not varies over time.  In order to approximate expected
      * behavior, this method returns TRUE if DST is observed at any
      * point in the current year.
      */
     virtual UBool useDaylightTime() const;
     /**
      * TimeZone API.
      */
     virtual UBool inDaylightTime(UDate date, UErrorCode& ec) const;
     /**
      * TimeZone API.
      */
     virtual int32_t getDSTSavings() const;
     /**
      * TimeZone API.  Also comare historic transitions.
      */
     virtual UBool hasSameRules(const TimeZone& other) const;
     /**
      * BasicTimeZone API.
      * Gets the first time zone transition after the base time.
      * @param base      The base time.
      * @param inclusive Whether the base time is inclusive or not.
      * @param result    Receives the first transition after the base time.
      * @return  TRUE if the transition is found.
      */
     virtual UBool getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const;
     /**
      * BasicTimeZone API.
      * Gets the most recent time zone transition before the base time.
      * @param base      The base time.
      * @param inclusive Whether the base time is inclusive or not.
      * @param result    Receives the most recent transition before the base time.
      * @return  TRUE if the transition is found.
      */
     virtual UBool getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const;
     /**
      * BasicTimeZone API.
      * Returns the number of <code>TimeZoneRule</code>s which represents time transitions,
      * for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except
      * <code>InitialTimeZoneRule</code>.  The return value range is 0 or any positive value.
      * @param status    Receives error status code.
      * @return The number of <code>TimeZoneRule</code>s representing time transitions.
      */
     virtual int32_t countTransitionRules(UErrorCode& status) const;
     /**
      * Gets the <code>InitialTimeZoneRule</code> and the set of <code>TimeZoneRule</code>
      * which represent time transitions for this time zone.  On successful return,
      * the argument initial points to non-NULL <code>InitialTimeZoneRule</code> and
      * the array trsrules is filled with 0 or multiple <code>TimeZoneRule</code>
      * instances up to the size specified by trscount.  The results are referencing the
      * rule instance held by this time zone instance.  Therefore, after this time zone
      * is destructed, they are no longer available.
      * @param initial       Receives the initial timezone rule
      * @param trsrules      Receives the timezone transition rules
      * @param trscount      On input, specify the size of the array 'transitions' receiving
      *                      the timezone transition rules.  On output, actual number of
      *                      rules filled in the array will be set.
      * @param status        Receives error status code.
      */
     virtual void getTimeZoneRules(const InitialTimeZoneRule*& initial,
         const TimeZoneRule* trsrules[], int32_t& trscount, UErrorCode& status) const;
     /**
      * Internal API returning the canonical ID of this zone.
      * This ID won't be affected by setID().
      */
     const UChar *getCanonicalID() const;
 private:
     /**
      * Default constructor.  Creates a time zone with an empty ID and
      * a fixed GMT offset of zero.
      */
     OlsonTimeZone();
 private:
     void constructEmpty();
     void getHistoricalOffset(UDate date, UBool local,
         int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt,
         int32_t& rawoff, int32_t& dstoff) const;
     int16_t transitionCount() const;
     int64_t transitionTimeInSeconds(int16_t transIdx) const;
     double transitionTime(int16_t transIdx) const;
     /*
      * Following 3 methods return an offset at the given transition time index.
      * When the index is negative, return the initial offset.
      */
     int32_t zoneOffsetAt(int16_t transIdx) const;
     int32_t rawOffsetAt(int16_t transIdx) const;
     int32_t dstOffsetAt(int16_t transIdx) const;
     /*
      * Following methods return the initial offset.
      */
     int32_t initialRawOffset() const;
     int32_t initialDstOffset() const;
     /**
      * Number of transitions in each time range
      */
     int16_t transitionCountPre32;
     int16_t transitionCount32;
     int16_t transitionCountPost32;
     /**
      * Time of each transition in seconds from 1970 epoch before 32bit second range (<= 1900).
      * Each transition in this range is represented by a pair of int32_t.
      * Length is transitionCount int32_t's.  NULL if no transitions in this range.
      */
     const int32_t *transitionTimesPre32; // alias into res; do not delete
     /**
      * Time of each transition in seconds from 1970 epoch in 32bit second range.
      * Length is transitionCount int32_t's.  NULL if no transitions in this range.
      */
     const int32_t *transitionTimes32; // alias into res; do not delete
     /**
      * Time of each transition in seconds from 1970 epoch after 32bit second range (>= 2038).
      * Each transition in this range is represented by a pair of int32_t.
      * Length is transitionCount int32_t's.  NULL if no transitions in this range.
      */
     const int32_t *transitionTimesPost32; // alias into res; do not delete
     /**
      * Number of types, 1..255
      */
     int16_t typeCount;
     /**
      * Offset from GMT in seconds for each type.
      * Length is typeCount int32_t's.  At least one type (a pair of int32_t)
      * is required.
      */
     const int32_t *typeOffsets; // alias into res; do not delete
     /**
      * Type description data, consisting of transitionCount uint8_t
      * type indices (from 0..typeCount-1).
      * Length is transitionCount int16_t's.  NULL if no transitions.
      */
     const uint8_t *typeMapData; // alias into res; do not delete
     /**
      * A SimpleTimeZone that governs the behavior for date >= finalMillis.
      */
     SimpleTimeZone *finalZone; // owned, may be NULL
     /**
      * For date >= finalMillis, the finalZone will be used.
      */
     double finalStartMillis;
     /**
      * For year >= finalYear, the finalZone will be used.
      */
     int32_t finalStartYear;
     /*
      * Canonical (CLDR) ID of this zone
      */
     const UChar *canonicalID;
     /* BasicTimeZone support */
     void clearTransitionRules(void);
     void deleteTransitionRules(void);
     void checkTransitionRules(UErrorCode& status) const;
   public:    // Internal, for access from plain C code
     void initTransitionRules(UErrorCode& status);
   private:
     InitialTimeZoneRule *initialRule;
     TimeZoneTransition  *firstTZTransition;
     int16_t             firstTZTransitionIdx;
     TimeZoneTransition  *firstFinalTZTransition;
     TimeArrayTimeZoneRule   **historicRules;
     int16_t             historicRuleCount;
     SimpleTimeZone      *finalZoneWithStartYear; // hack
     UInitOnce           transitionRulesInitOnce;
 };
 inline int16_t
 OlsonTimeZone::transitionCount() const {
     return transitionCountPre32 + transitionCount32 + transitionCountPost32;
 }
 inline double
 OlsonTimeZone::transitionTime(int16_t transIdx) const {
     return (double)transitionTimeInSeconds(transIdx) * U_MILLIS_PER_SECOND;
 }
 inline int32_t
 OlsonTimeZone::zoneOffsetAt(int16_t transIdx) const {
     int16_t typeIdx = (transIdx >= 0 ? typeMapData[transIdx] : 0) << 1;
     return typeOffsets[typeIdx] + typeOffsets[typeIdx + 1];
 }
 inline int32_t
 OlsonTimeZone::rawOffsetAt(int16_t transIdx) const {
     int16_t typeIdx = (transIdx >= 0 ? typeMapData[transIdx] : 0) << 1;
     return typeOffsets[typeIdx];
 }
 inline int32_t
 OlsonTimeZone::dstOffsetAt(int16_t transIdx) const {
     int16_t typeIdx = (transIdx >= 0 ? typeMapData[transIdx] : 0) << 1;
     return typeOffsets[typeIdx + 1];
 }
 inline int32_t
 OlsonTimeZone::initialRawOffset() const {
     return typeOffsets[0];
 }
 inline int32_t
 OlsonTimeZone::initialDstOffset() const {
     return typeOffsets[1];
 }
 inline const UChar*
 OlsonTimeZone::getCanonicalID() const {
     return canonicalID;
 }
 U_NAMESPACE_END
 #endif // !UCONFIG_NO_FORMATTING
 #endif // OLSONTZ_H
 //eof

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intl/icu/source/i18n/olsontz.h@fc2d59ddac77 (annotated)

intl/icu/source/i18n/olsontz.h