| /* |
| * Copyright © {1997-1999}, International Business Machines Corporation and others. All Rights Reserved. |
| ******************************************************************************** |
| * |
| * File TIMEZONE.H |
| * |
| * Modification History: |
| * |
| * Date Name Description |
| * 04/21/97 aliu Overhauled header. |
| * 07/09/97 helena Changed createInstance to createDefault. |
| * 08/06/97 aliu Removed dependency on internal header for Hashtable. |
| * 08/10/98 stephen Changed getDisplayName() API conventions to match |
| * 08/19/98 stephen Changed createTimeZone() to never return 0 |
| * 09/02/98 stephen Sync to JDK 1.2 8/31 |
| * - Added getOffset(... monthlen ...) |
| * - Added hasSameRules() |
| * 09/15/98 stephen Added getStaticClassID |
| * 12/03/99 aliu Moved data out of static table into icudata.dll. |
| * Hashtable replaced by new static data structures. |
| * 12/14/99 aliu Made GMT public. |
| ******************************************************************************** |
| */ |
| |
| #ifndef TIMEZONE_H |
| #define TIMEZONE_H |
| |
| |
| #include "unicode/unistr.h" |
| #include "unicode/locid.h" |
| |
| #include "unicode/udata.h" |
| |
| class SimpleTimeZone; |
| struct TZHeader; |
| struct OffsetIndex; |
| |
| /** |
| * <code>TimeZone</code> represents a time zone offset, and also figures out daylight |
| * savings. |
| * |
| * <p> |
| * Typically, you get a <code>TimeZone</code> using <code>createDefault</code> |
| * which creates a <code>TimeZone</code> based on the time zone where the program |
| * is running. For example, for a program running in Japan, <code>createDefault</code> |
| * creates a <code>TimeZone</code> object based on Japanese Standard Time. |
| * |
| * <p> |
| * You can also get a <code>TimeZone</code> using <code>createTimeZone</code> along |
| * with a time zone ID. For instance, the time zone ID for the Pacific |
| * Standard Time zone is "PST". So, you can get a PST <code>TimeZone</code> object |
| * with: |
| * <blockquote> |
| * <pre> |
| * TimeZone *tz = TimeZone::createTimeZone("PST"); |
| * </pre> |
| * </blockquote> |
| * You can use <code>getAvailableIDs</code> method to iterate through |
| * all the supported time zone IDs. You can then choose a |
| * supported ID to get a <code>TimeZone</code>. |
| * If the time zone you want is not represented by one of the |
| * supported IDs, then you can create a custom time zone ID with |
| * the following syntax: |
| * |
| * <blockquote> |
| * <pre> |
| * GMT[+|-]hh[[:]mm] |
| * </pre> |
| * </blockquote> |
| * |
| * For example, you might specify GMT+14:00 as a custom |
| * time zone ID. The <code>TimeZone</code> that is returned |
| * when you specify a custom time zone ID does not include |
| * daylight savings time. |
| * |
| |
| |
| * TimeZone is an abstract class representing a time zone. A TimeZone is needed for |
| * Calendar to produce local time for a particular time zone. A TimeZone comprises |
| * three basic pieces of information:<ul> |
| * <li>A time zone offset; that, is the number of milliseconds to add or subtract |
| * from a time expressed in terms of GMT to convert it to the same time in that |
| * time zone (without taking daylight savings time into account). |
| * <li>Logic necessary to take daylight savings time into account if daylight savings |
| * time is observed in that time zone (e.g., the days and hours on which daylight |
| * savings time begins and ends). |
| * <li>An ID. This is a text string that uniquely identifies the time zone.</ul> |
| * |
| * (Only the ID is actually implemented in TimeZone; subclasses of TimeZone may handle |
| * daylight savings time and GMT offset in different ways. Currently we only have one |
| * TimeZone subclass: SimpleTimeZone.) |
| * <P> |
| * The TimeZone class contains a static list containing a TimeZone object for every |
| * combination of GMT offset and daylight-savings time rules currently in use in the |
| * world, each with a unique ID. Each ID consists of a region (usually a continent or |
| * ocean) and a city in that region, separated by a slash, (for example, Pacific |
| * Standard Time is "America/Los_Angeles.") Because older versions of this class used |
| * three- or four-letter abbreviations instead, there is also a table that maps the older |
| * abbreviations to the newer ones (for example, "PST" maps to "America/LosAngeles"). |
| * Anywhere the API requires an ID, you can use either form. |
| * <P> |
| * To create a new TimeZone, you call the factory function TimeZone::createTimeZone() |
| * and pass it a time zone ID. You can use the createAvailableIDs() function to |
| * obtain a list of all the time zone IDs recognized by createTimeZone(). |
| * <P> |
| * You can also use TimeZone::createDefault() to create a TimeZone. This function uses |
| * platform-specific APIs to produce a TimeZone for the time zone corresponding to |
| * the client's computer's physical location. For example, if you're in Japan (assuming |
| * your machine is set up correctly), TimeZone::createDefault() will return a TimeZone |
| * for Japanese Standard Time ("Asia/Tokyo"). |
| */ |
| class U_I18N_API TimeZone { |
| public: |
| /** |
| * @stable |
| */ |
| virtual ~TimeZone(); |
| |
| /** |
| * The GMT zone has a raw offset of zero and does not use daylight |
| * savings time. |
| */ |
| static const TimeZone* GMT; |
| |
| /** |
| * Creates a <code>TimeZone</code> for the given ID. |
| * @param ID the ID for a <code>TimeZone</code>, either an abbreviation such as |
| * "PST", a full name such as "America/Los_Angeles", or a custom ID |
| * such as "GMT-8:00". |
| * @return the specified <code>TimeZone</code>, or the GMT zone if the given ID |
| * cannot be understood. Return result guaranteed to be non-null. If you |
| * require that the specific zone asked for be returned, check the ID of the |
| * return result. |
| * @stable |
| */ |
| static TimeZone* createTimeZone(const UnicodeString& ID); |
| |
| /** |
| * Returns a list of time zone IDs, one for each time zone with a given GMT offset. |
| * The return value is a list because there may be several times zones with the same |
| * GMT offset that differ in the way they handle daylight savings time. For example, |
| * the state of Arizona doesn't observe Daylight Savings time. So if you ask for |
| * the time zone IDs corresponding to GMT-7:00, you'll get back two time zone IDs: |
| * "America/Denver," which corresponds to Mountain Standard Time in the winter and |
| * Mountain Daylight Time in the summer, and "America/Phoenix", which corresponds to |
| * Mountain Standard Time year-round, even in the summer. |
| * <P> |
| * The caller owns the list that is returned, but does not own the strings contained |
| * in that list. Delete the array, but DON'T delete the elements in the array. |
| * |
| * @param rawOffset An offset from GMT in milliseconds. |
| * @param numIDs Receives the number of items in the array that is returned. |
| * @return An array of UnicodeString pointers, where each UnicodeString is |
| * a time zone ID for a time zone with the given GMT offset. If |
| * there is no timezone that matches the GMT offset |
| * specified, NULL is returned. |
| * @stable |
| */ |
| static const UnicodeString** const createAvailableIDs(int32_t rawOffset, int32_t& numIDs); |
| |
| /** |
| * Returns a list of all time zone IDs supported by the TimeZone class (i.e., all |
| * IDs that it's legal to pass to createTimeZone()). The caller owns the list that |
| * is returned, but does not own the strings contained in that list. Delete the array, |
| * but DON'T delete the elements in the array. |
| * |
| * @param numIDs Receives the number of zone IDs returned. |
| * @return An array of UnicodeString pointers, where each is a time zone ID |
| * supported by the TimeZone class. |
| * @stable |
| */ |
| static const UnicodeString** const createAvailableIDs(int32_t& numIDs); |
| |
| /** |
| * Creates a new copy of the default TimeZone for this host. Unless the default time |
| * zone has already been set using adoptDefault() or setDefault(), the default is |
| * determined by querying the system using methods in TPlatformUtilities. If the |
| * system routines fail, or if they specify a TimeZone or TimeZone offset which is not |
| * recognized, the TimeZone indicated by the ID kLastResortID is instantiated |
| * and made the default. |
| * |
| * @return A default TimeZone. Clients are responsible for deleting the time zone |
| * object returned. |
| * @stable |
| */ |
| static TimeZone* createDefault(void); |
| |
| /** |
| * Sets the default time zone (i.e., what's returned by getDefault()) to be the |
| * specified time zone. If NULL is specified for the time zone, the default time |
| * zone is set to the default host time zone. This call adopts the TimeZone object |
| * passed in; the clent is no longer responsible for deleting it. |
| * |
| * @param zone A pointer to the new TimeZone object to use as the default. |
| * @stable |
| */ |
| static void adoptDefault(TimeZone* zone); |
| |
| /** |
| * Same as adoptDefault(), except that the TimeZone object passed in is NOT adopted; |
| * the caller remains responsible for deleting it. |
| * |
| * @param zone The given timezone. |
| * @system |
| */ |
| static void setDefault(const TimeZone& zone); |
| |
| /** |
| * Returns true if the two TimeZones are equal. (The TimeZone version only compares |
| * IDs, but subclasses are expected to also compare the fields they add.) |
| * |
| * @param that The TimeZone object to be compared with. |
| * @return True if the given TimeZone is equal to this TimeZone; false |
| * otherwise. |
| * @stable |
| */ |
| virtual bool_t operator==(const TimeZone& that) const; |
| |
| /** |
| * Returns true if the two TimeZones are NOT equal; that is, if operator==() returns |
| * false. |
| * |
| * @param that The TimeZone object to be compared with. |
| * @return True if the given TimeZone is not equal to this TimeZone; false |
| * otherwise. |
| * @stable |
| */ |
| bool_t operator!=(const TimeZone& that) const {return !operator==(that);} |
| |
| /** |
| * 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 in GMT, NOT local time. |
| * |
| * @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, UTT (NOT local time). |
| * @return The offset in milliseconds to add to GMT to get local time. |
| * @stable |
| */ |
| virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day, |
| uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const = 0; |
| /** |
| * @deprecated |
| */ |
| virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day, |
| uint8_t dayOfWeek, int32_t millis) const = 0; |
| |
| /** |
| * 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. |
| * @param era the era of the given date. |
| * @param year the year in the given date. |
| * @param month the month in the given date. |
| * Month is 0-based. e.g., 0 for January. |
| * @param day the day-in-month of the given date. |
| * @param dayOfWeek the day-of-week of the given date. |
| * @param milliseconds the millis in day in <em>standard</em> local time. |
| * @param monthLength the length of the given month in days. |
| * @return the offset to add *to* GMT to get local time. |
| * @stable |
| */ |
| virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day, |
| uint8_t dayOfWeek, int32_t milliseconds, |
| int32_t monthLength, UErrorCode& status) const = 0; |
| |
| /** |
| * 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 offsetMillis The new raw GMT offset for this time zone. |
| * @stable |
| */ |
| virtual void setRawOffset(int32_t offsetMillis) = 0; |
| |
| /** |
| * 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). |
| * |
| * @return The TimeZone's raw GMT offset. |
| * @stable |
| */ |
| virtual int32_t getRawOffset(void) const = 0; |
| |
| /** |
| * Fills in "ID" with the TimeZone's ID. |
| * |
| * @param ID Receives this TimeZone's ID. |
| * @return "ID" |
| * @stable |
| */ |
| UnicodeString& getID(UnicodeString& ID) const; |
| |
| /** |
| * Sets the TimeZone's ID to the specified value. This doesn't affect any other |
| * fields (for example, if you say< |
| * blockquote><pre> |
| * . TimeZone* foo = TimeZone::createTimeZone("America/New_York"); |
| * . foo.setID("America/Los_Angeles"); |
| * </pre></blockquote> |
| * the time zone's GMT offset and daylight-savings rules don't change to those for |
| * Los Angeles. They're still those for New York. Only the ID has changed.) |
| * |
| * @param ID The new timezone ID. |
| * @stable |
| */ |
| void setID(const UnicodeString& ID); |
| |
| /** |
| * Enum for use with getDisplayName |
| */ |
| |
| enum EDisplayType { |
| SHORT = 1, |
| LONG |
| }; |
| |
| /** |
| * Returns a name of this time zone suitable for presentation to the user |
| * in the default locale. |
| * This method returns the long name, not including daylight savings. |
| * If the display name is not available for the locale, |
| * then this method returns a string in the format |
| * <code>GMT[+-]hh:mm</code>. |
| * @return the human-readable name of this time zone in the default locale. |
| * @stable |
| */ |
| UnicodeString& getDisplayName(UnicodeString& result) const; |
| |
| /** |
| * Returns a name of this time zone suitable for presentation to the user |
| * in the specified locale. |
| * This method returns the long name, not including daylight savings. |
| * If the display name is not available for the locale, |
| * then this method returns a string in the format |
| * <code>GMT[+-]hh:mm</code>. |
| * @param locale the locale in which to supply the display name. |
| * @return the human-readable name of this time zone in the given locale |
| * or in the default locale if the given locale is not recognized. |
| * @stable |
| */ |
| UnicodeString& getDisplayName(const Locale& locale, UnicodeString& result) const; |
| |
| /** |
| * Returns a name of this time zone suitable for presentation to the user |
| * in the default locale. |
| * If the display name is not available for the locale, |
| * then this method returns a string in the format |
| * <code>GMT[+-]hh:mm</code>. |
| * @param daylight if true, return the daylight savings name. |
| * @param style either <code>LONG</code> or <code>SHORT</code> |
| * @return the human-readable name of this time zone in the default locale. |
| * @stable |
| */ |
| UnicodeString& getDisplayName(bool_t daylight, EDisplayType style, UnicodeString& result) const; |
| |
| /** |
| * Returns a name of this time zone suitable for presentation to the user |
| * in the specified locale. |
| * If the display name is not available for the locale, |
| * then this method returns a string in the format |
| * <code>GMT[+-]hh:mm</code>. |
| * @param daylight if true, return the daylight savings name. |
| * @param style either <code>LONG</code> or <code>SHORT</code> |
| * @param locale the locale in which to supply the display name. |
| * @return the human-readable name of this time zone in the given locale |
| * or in the default locale if the given locale is not recognized. |
| * @stable |
| */ |
| UnicodeString& getDisplayName(bool_t daylight, EDisplayType style, const Locale& locale, UnicodeString& result) const; |
| |
| /** |
| * Queries if this time zone uses daylight savings time. |
| * @return true if this time zone uses daylight savings time, |
| * false, otherwise. |
| * @stable |
| */ |
| virtual bool_t useDaylightTime(void) const = 0; |
| |
| /** |
| * Queries if the given date is in daylight savings time in |
| * this time zone. |
| * @param date the given UDate. |
| * @return true if the given date is in daylight savings time, |
| * false, otherwise. |
| * @deprecated |
| */ |
| virtual bool_t inDaylightTime(UDate date, UErrorCode& status) const = 0; |
| |
| /** |
| * 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 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 |
| * @stable |
| */ |
| virtual bool_t hasSameRules(const TimeZone& other) const; |
| |
| /** |
| * Clones TimeZone objects polymorphically. Clients are responsible for deleting |
| * the TimeZone object cloned. |
| * |
| * @return A new copy of this TimeZone object. |
| * @stable |
| */ |
| virtual TimeZone* clone(void) const = 0; |
| |
| /** |
| * 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() == |
| * . Derived::getStaticClassID()) ... |
| * </pre> |
| * @return The class ID for all objects of this class. |
| * @stable |
| */ |
| static UClassID getStaticClassID(void) { return (UClassID)&fgClassID; } |
| |
| /** |
| * Returns a unique class ID POLYMORPHICALLY. Pure virtual method. 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. |
| * <P> |
| * Concrete subclasses of TimeZone must implement getDynamicClassID() and also a |
| * static method and data member: |
| * <pre> |
| * . static UClassID getStaticClassID() { return (UClassID)&fgClassID; } |
| * . static char fgClassID; |
| * </pre> |
| * @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. |
| * @stable |
| */ |
| virtual UClassID getDynamicClassID(void) const = 0; |
| |
| protected: |
| |
| /** |
| * Default constructor. ID is initialized to the empty string. |
| * @stable |
| */ |
| TimeZone(); |
| |
| /** |
| * Copy constructor. |
| * @stable |
| */ |
| TimeZone(const TimeZone& source); |
| |
| /** |
| * Default assignment operator. |
| * @stable |
| */ |
| TimeZone& operator=(const TimeZone& right); |
| |
| private: |
| static char fgClassID; |
| |
| static TimeZone* createCustomTimeZone(const UnicodeString&); // Creates a time zone based on the string. |
| |
| static TimeZone* fgDefaultZone; // default time zone (lazy evaluated) |
| |
| static const UnicodeString GMT_ID; |
| static const int32_t GMT_ID_LENGTH; |
| static const UnicodeString CUSTOM_ID; |
| |
| //////////////////////////////////////////////////////////////// |
| // Pointers into memory-mapped icudata. Writing to this memory |
| // will segfault! See tzdat.h for more details. |
| //////////////////////////////////////////////////////////////// |
| |
| /** |
| * DATA is the start of the memory-mapped zone data, and |
| * specifically points to the header object located there. |
| * May be zero if loading failed for some reason. |
| */ |
| static const TZHeader * DATA; |
| |
| /** |
| * INDEX_BY_ID is an index table in lexicographic order of ID. |
| * Each entry is an offset from DATA to the zone object, which |
| * will either be a StandardZone or a DSTZone object. |
| */ |
| static const uint32_t* INDEX_BY_ID; |
| |
| /** |
| * INDEX_BY_OFFSET is an OffsetIndex table. This table can only |
| * be walked through sequentially because the entries are of |
| * variable size. |
| */ |
| static const OffsetIndex* INDEX_BY_OFFSET; |
| |
| //////////////////////////////////////////////////////////////// |
| // Other system zone data structures |
| //////////////////////////////////////////////////////////////// |
| /** |
| * ZONE_IDS is an array of all the system zone ID strings, in |
| * lexicographic order. The createAvailableIDs() methods return |
| * arrays of pointers into this array. |
| */ |
| static UnicodeString* ZONE_IDS; |
| |
| /** |
| * If DATA_LOADED is true, then an attempt has already been made |
| * to load the system zone data, and further attempts will not be |
| * made. If DATA_LOADED is true, DATA itself will be zero if |
| * loading failed, or non-zero if it succeeded. |
| */ |
| static bool_t DATA_LOADED; |
| |
| /** |
| * The mutex object used to control write access to DATA, |
| * INDEX_BY_ID, INDEX_BY_OFFSET, and ZONE_IDS. Also used to |
| * control read/write access to fgDefaultZone. |
| */ |
| static UMTX LOCK; |
| |
| /** |
| * Responsible for setting up fgDefaultZone. Uses routines in TPlatformUtilities |
| * (i.e., platform-specific calls) to get the current system time zone. Failing |
| * that, uses the platform-specific default time zone. Failing that, uses GMT. |
| */ |
| static void initDefault(void); |
| |
| // See source file for documentation |
| static void loadZoneData(void); |
| |
| // See source file for documentation |
| static bool_t U_CALLCONV isDataAcceptable(void *context, |
| const char *type, const char *name, |
| UDataInfo *pInfo); |
| |
| // See source file for documentation |
| static TimeZone* createSystemTimeZone(const UnicodeString& name); |
| |
| UnicodeString fID; // this time zone's ID |
| }; |
| |
| |
| // ------------------------------------- |
| |
| inline UnicodeString& |
| TimeZone::getID(UnicodeString& ID) const |
| { |
| ID = fID; |
| return ID; |
| } |
| |
| // ------------------------------------- |
| |
| inline void |
| TimeZone::setID(const UnicodeString& ID) |
| { |
| fID = ID; |
| } |
| |
| #endif //_TIMEZONE |
| //eof |
