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Edit File : dtitvinf.h \| Size : 18.51 KB
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * Copyright (C) 2008-2016, International Business Machines Corporation and * others. All Rights Reserved. ******************************************************************************* * * File DTITVINF.H * ******************************************************************************* / #ifndef __DTITVINF_H__ #define __DTITVINF_H__ #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API /* * \file * \brief C++ API: Date/Time interval patterns for formatting date/time interval / #if !UCONFIG_NO_FORMATTING #include "unicode/udat.h" #include "unicode/locid.h" #include "unicode/ucal.h" #include "unicode/dtptngen.h" U_NAMESPACE_BEGIN /* * DateIntervalInfo is a public class for encapsulating localizable * date time interval patterns. It is used by DateIntervalFormat. * * <P> * For most users, ordinary use of DateIntervalFormat does not need to create * DateIntervalInfo object directly. * DateIntervalFormat will take care of it when creating a date interval * formatter when user pass in skeleton and locale. * * <P> * For power users, who want to create their own date interval patterns, * or want to re-set date interval patterns, they could do so by * directly creating DateIntervalInfo and manupulating it. * * <P> * Logically, the interval patterns are mappings * from (skeleton, the_largest_different_calendar_field) * to (date_interval_pattern). * * <P> * A skeleton * <ol> * <li> * only keeps the field pattern letter and ignores all other parts * in a pattern, such as space, punctuations, and string literals. * <li> * hides the order of fields. * <li> * might hide a field's pattern letter length. * * For those non-digit calendar fields, the pattern letter length is * important, such as MMM, MMMM, and MMMMM; EEE and EEEE, * and the field's pattern letter length is honored. * * For the digit calendar fields, such as M or MM, d or dd, yy or yyyy, * the field pattern length is ignored and the best match, which is defined * in date time patterns, will be returned without honor the field pattern * letter length in skeleton. * </ol> * * <P> * The calendar fields we support for interval formatting are: * year, month, date, day-of-week, am-pm, hour, hour-of-day, and minute. * Those calendar fields can be defined in the following order: * year > month > date > am-pm > hour > minute * * The largest different calendar fields between 2 calendars is the * first different calendar field in above order. * * For example: the largest different calendar fields between "Jan 10, 2007" * and "Feb 20, 2008" is year. * * <P> * There is a set of pre-defined static skeleton strings. * There are pre-defined interval patterns for those pre-defined skeletons * in locales' resource files. * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is "yMMMd", * in en_US, if the largest different calendar field between date1 and date2 * is "year", the date interval pattern is "MMM d, yyyy - MMM d, yyyy", * such as "Jan 10, 2007 - Jan 10, 2008". * If the largest different calendar field between date1 and date2 is "month", * the date interval pattern is "MMM d - MMM d, yyyy", * such as "Jan 10 - Feb 10, 2007". * If the largest different calendar field between date1 and date2 is "day", * the date interval pattern is "MMM d-d, yyyy", such as "Jan 10-20, 2007". * * For date skeleton, the interval patterns when year, or month, or date is * different are defined in resource files. * For time skeleton, the interval patterns when am/pm, or hour, or minute is * different are defined in resource files. * * * <P> * There are 2 dates in interval pattern. For most locales, the first date * in an interval pattern is the earlier date. There might be a locale in which * the first date in an interval pattern is the later date. * We use fallback format for the default order for the locale. * For example, if the fallback format is "{0} - {1}", it means * the first date in the interval pattern for this locale is earlier date. * If the fallback format is "{1} - {0}", it means the first date is the * later date. * For a particular interval pattern, the default order can be overriden * by prefixing "latestFirst:" or "earliestFirst:" to the interval pattern. * For example, if the fallback format is "{0}-{1}", * but for skeleton "yMMMd", the interval pattern when day is different is * "latestFirst:d-d MMM yy", it means by default, the first date in interval * pattern is the earlier date. But for skeleton "yMMMd", when day is different, * the first date in "d-d MMM yy" is the later date. * * <P> * The recommended way to create a DateIntervalFormat object is to pass in * the locale. * By using a Locale parameter, the DateIntervalFormat object is * initialized with the pre-defined interval patterns for a given or * default locale. * <P> * Users can also create DateIntervalFormat object * by supplying their own interval patterns. * It provides flexibility for power users. * * <P> * After a DateIntervalInfo object is created, clients may modify * the interval patterns using setIntervalPattern function as so desired. * Currently, users can only set interval patterns when the following * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, and MINUTE. * Interval patterns when other calendar fields are different is not supported. * <P> * DateIntervalInfo objects are cloneable. * When clients obtain a DateIntervalInfo object, * they can feel free to modify it as necessary. * <P> * DateIntervalInfo are not expected to be subclassed. * Data for a calendar is loaded out of resource bundles. * Through ICU 4.4, date interval patterns are only supported in the Gregorian * calendar; non-Gregorian calendars are supported from ICU 4.4.1. * @stable ICU 4.0 / class U_I18N_API DateIntervalInfo U_FINAL : public UObject { public: / * Default constructor. * It does not initialize any interval patterns except * that it initialize default fall-back pattern as "{0} - {1}", * which can be reset by setFallbackIntervalPattern(). * It should be followed by setFallbackIntervalPattern() and * setIntervalPattern(), * and is recommended to be used only for power users who * wants to create their own interval patterns and use them to create * date interval formatter. * @param status output param set to success/failure code on exit * @internal ICU 4.0 / DateIntervalInfo(UErrorCode& status); /* * Construct DateIntervalInfo for the given locale, * @param locale the interval patterns are loaded from the appropriate calendar * data (specified calendar or default calendar) in this locale. * @param status output param set to success/failure code on exit * @stable ICU 4.0 / DateIntervalInfo(const Locale& locale, UErrorCode& status); /* * Copy constructor. * @stable ICU 4.0 / DateIntervalInfo(const DateIntervalInfo&); /* * Assignment operator * @stable ICU 4.0 / DateIntervalInfo& operator=(const DateIntervalInfo&); /* * Clone this object polymorphically. * The caller owns the result and should delete it when done. * @return a copy of the object * @stable ICU 4.0 / virtual DateIntervalInfo clone() const; /** * Destructor. * It is virtual to be safe, but it is not designed to be subclassed. * @stable ICU 4.0 / virtual ~DateIntervalInfo(); /* * Return true if another object is semantically equal to this one. * * @param other the DateIntervalInfo object to be compared with. * @return true if other is semantically equal to this. * @stable ICU 4.0 / virtual UBool operator==(const DateIntervalInfo& other) const; /* * Return true if another object is semantically unequal to this one. * * @param other the DateIntervalInfo object to be compared with. * @return true if other is semantically unequal to this. * @stable ICU 4.0 / UBool operator!=(const DateIntervalInfo& other) const; /* * Provides a way for client to build interval patterns. * User could construct DateIntervalInfo by providing a list of skeletons * and their patterns. * <P> * For example: * <pre> * UErrorCode status = U_ZERO_ERROR; * DateIntervalInfo dIntervalInfo = new DateIntervalInfo(); * dIntervalInfo->setFallbackIntervalPattern("{0} ~ {1}"); * dIntervalInfo->setIntervalPattern("yMd", UCAL_YEAR, "'from' yyyy-M-d 'to' yyyy-M-d", status); * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_MONTH, "'from' yyyy MMM d 'to' MMM d", status); * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_DAY, "yyyy MMM d-d", status, status); * </pre> * * Restriction: * Currently, users can only set interval patterns when the following * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, and MINUTE. * Interval patterns when other calendar fields are different are * not supported. * * @param skeleton the skeleton on which interval pattern based * @param lrgDiffCalUnit the largest different calendar unit. * @param intervalPattern the interval pattern on the largest different * calendar unit. * For example, if lrgDiffCalUnit is * "year", the interval pattern for en_US when year * is different could be "'from' yyyy 'to' yyyy". * @param status output param set to success/failure code on exit * @stable ICU 4.0 / void setIntervalPattern(const UnicodeString& skeleton, UCalendarDateFields lrgDiffCalUnit, const UnicodeString& intervalPattern, UErrorCode& status); /* * Get the interval pattern given skeleton and * the largest different calendar field. * @param skeleton the skeleton * @param field the largest different calendar field * @param result output param to receive the pattern * @param status output param set to success/failure code on exit * @return a reference to 'result' * @stable ICU 4.0 / UnicodeString& getIntervalPattern(const UnicodeString& skeleton, UCalendarDateFields field, UnicodeString& result, UErrorCode& status) const; /* * Get the fallback interval pattern. * @param result output param to receive the pattern * @return a reference to 'result' * @stable ICU 4.0 / UnicodeString& getFallbackIntervalPattern(UnicodeString& result) const; /* * Re-set the fallback interval pattern. * * In construction, default fallback pattern is set as "{0} - {1}". * And constructor taking locale as parameter will set the * fallback pattern as what defined in the locale resource file. * * This method provides a way for user to replace the fallback pattern. * * @param fallbackPattern fall-back interval pattern. * @param status output param set to success/failure code on exit * @stable ICU 4.0 / void setFallbackIntervalPattern(const UnicodeString& fallbackPattern, UErrorCode& status); /* Get default order -- whether the first date in pattern is later date or not. * return default date ordering in interval pattern. TRUE if the first date * in pattern is later date, FALSE otherwise. * @stable ICU 4.0 / UBool getDefaultOrder() const; /* * ICU "poor man's RTTI", returns a UClassID for the actual class. * * @stable ICU 4.0 / virtual UClassID getDynamicClassID() const; /* * ICU "poor man's RTTI", returns a UClassID for this class. * * @stable ICU 4.0 / static UClassID U_EXPORT2 getStaticClassID(); private: /* * DateIntervalFormat will need access to * getBestSkeleton(), parseSkeleton(), enum IntervalPatternIndex, * and calendarFieldToPatternIndex(). * * Instead of making above public, * make DateIntervalFormat a friend of DateIntervalInfo. / friend class DateIntervalFormat; /* * Internal struct used to load resource bundle data. / struct DateIntervalSink; /* * Following is for saving the interval patterns. * We only support interval patterns on * ERA, YEAR, MONTH, DAY, AM_PM, HOUR, and MINUTE / enum IntervalPatternIndex { kIPI_ERA, kIPI_YEAR, kIPI_MONTH, kIPI_DATE, kIPI_AM_PM, kIPI_HOUR, kIPI_MINUTE, kIPI_SECOND, kIPI_MAX_INDEX }; public: #ifndef U_HIDE_INTERNAL_API /* * Max index for stored interval patterns * @internal ICU 4.4 / enum { kMaxIntervalPatternIndex = kIPI_MAX_INDEX }; #endif / U_HIDE_INTERNAL_API / private: /* * Initialize the DateIntervalInfo from locale * @param locale the given locale. * @param status output param set to success/failure code on exit / void initializeData(const Locale& locale, UErrorCode& status); / Set Interval pattern. * * It sets interval pattern into the hash map. * * @param skeleton skeleton on which the interval pattern based * @param lrgDiffCalUnit the largest different calendar unit. * @param intervalPattern the interval pattern on the largest different * calendar unit. * @param status output param set to success/failure code on exit / void setIntervalPatternInternally(const UnicodeString& skeleton, UCalendarDateFields lrgDiffCalUnit, const UnicodeString& intervalPattern, UErrorCode& status); /given an input skeleton, get the best match skeleton which has pre-defined interval pattern in resource file. * Also return the difference between the input skeleton * and the best match skeleton. * * TODO (xji): set field weight or * isolate the funtionality in DateTimePatternGenerator * @param skeleton input skeleton * @param bestMatchDistanceInfo the difference between input skeleton * and best match skeleton. * 0, if there is exact match for input skeleton * 1, if there is only field width difference between * the best match and the input skeleton * 2, the only field difference is 'v' and 'z' * -1, if there is calendar field difference between * the best match and the input skeleton * @return best match skeleton / const UnicodeString getBestSkeleton(const UnicodeString& skeleton, int8_t& bestMatchDistanceInfo) const; /** * Parse skeleton, save each field's width. * It is used for looking for best match skeleton, * and adjust pattern field width. * @param skeleton skeleton to be parsed * @param skeletonFieldWidth parsed skeleton field width / static void U_EXPORT2 parseSkeleton(const UnicodeString& skeleton, int32_t skeletonFieldWidth); /** * Check whether one field width is numeric while the other is string. * * TODO (xji): make it general * * @param fieldWidth one field width * @param anotherFieldWidth another field width * @param patternLetter pattern letter char * @return true if one field width is numeric and the other is string, * false otherwise. / static UBool U_EXPORT2 stringNumeric(int32_t fieldWidth, int32_t anotherFieldWidth, char patternLetter); /* * Convert calendar field to the interval pattern index in * hash table. * * Since we only support the following calendar fields: * ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, DAY_OF_WEEK, * AM_PM, HOUR, HOUR_OF_DAY, and MINUTE, * We reserve only 4 interval patterns for a skeleton. * * @param field calendar field * @param status output param set to success/failure code on exit * @return interval pattern index in hash table / static IntervalPatternIndex U_EXPORT2 calendarFieldToIntervalIndex( UCalendarDateFields field, UErrorCode& status); /* * delete hash table (of type fIntervalPatterns). * * @param hTable hash table to be deleted / void deleteHash(Hashtable hTable); /** * initialize hash table (of type fIntervalPatterns). * * @param status output param set to success/failure code on exit * @return hash table initialized / Hashtable initHash(UErrorCode& status); /** * copy hash table (of type fIntervalPatterns). * * @param source the source to copy from * @param target the target to copy to * @param status output param set to success/failure code on exit / void copyHash(const Hashtable source, Hashtable* target, UErrorCode& status); // data members // fallback interval pattern UnicodeString fFallbackIntervalPattern; // default order UBool fFirstDateInPtnIsLaterDate; // HashMap<UnicodeString, UnicodeString[kIPI_MAX_INDEX]> // HashMap( skeleton, pattern[largest_different_field] ) Hashtable* fIntervalPatterns; };// end class DateIntervalInfo inline UBool DateIntervalInfo::operator!=(const DateIntervalInfo& other) const { return !operator==(other); } U_NAMESPACE_END #endif #endif /* U_SHOW_CPLUSPLUS_API */ #endif Back

Edit File : dtitvinf.h | Size : 18.51 KB

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 *******************************************************************************
 * Copyright (C) 2008-2016, International Business Machines Corporation and
 * others. All Rights Reserved.
 *******************************************************************************
 *
 * File DTITVINF.H
 *
 *******************************************************************************
 */

#ifndef __DTITVINF_H__
#define __DTITVINF_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

/**
 * \file
 * \brief C++ API: Date/Time interval patterns for formatting date/time interval
 */

#if !UCONFIG_NO_FORMATTING

#include "unicode/udat.h"
#include "unicode/locid.h"
#include "unicode/ucal.h"
#include "unicode/dtptngen.h"

U_NAMESPACE_BEGIN

/**
 * DateIntervalInfo is a public class for encapsulating localizable
 * date time interval patterns. It is used by DateIntervalFormat.
 *
 * 
 * For most users, ordinary use of DateIntervalFormat does not need to create
 * DateIntervalInfo object directly.
 * DateIntervalFormat will take care of it when creating a date interval
 * formatter when user pass in skeleton and locale.
 *
 * 
 * For power users, who want to create their own date interval patterns,
 * or want to re-set date interval patterns, they could do so by
 * directly creating DateIntervalInfo and manupulating it.
 *
 * 
 * Logically, the interval patterns are mappings
 * from (skeleton, the_largest_different_calendar_field)
 * to (date_interval_pattern).
 *
 * 
 * A skeleton
 * <ol>
 * <li>
 * only keeps the field pattern letter and ignores all other parts
 * in a pattern, such as space, punctuations, and string literals.
 * <li>
 * hides the order of fields.
 * <li>
 * might hide a field's pattern letter length.
 *
 * For those non-digit calendar fields, the pattern letter length is
 * important, such as MMM, MMMM, and MMMMM; EEE and EEEE,
 * and the field's pattern letter length is honored.
 *
 * For the digit calendar fields, such as M or MM, d or dd, yy or yyyy,
 * the field pattern length is ignored and the best match, which is defined
 * in date time patterns, will be returned without honor the field pattern
 * letter length in skeleton.
 * </ol>
 *
 * 
 * The calendar fields we support for interval formatting are:
 * year, month, date, day-of-week, am-pm, hour, hour-of-day, and minute.
 * Those calendar fields can be defined in the following order:
 * year > month > date > am-pm > hour > minute
 *
 * The largest different calendar fields between 2 calendars is the
 * first different calendar field in above order.
 *
 * For example: the largest different calendar fields between &quot;Jan 10, 2007&quot;
 * and &quot;Feb 20, 2008&quot; is year.
 *
 * 
 * There is a set of pre-defined static skeleton strings.
 * There are pre-defined interval patterns for those pre-defined skeletons
 * in locales' resource files.
 * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is &quot;yMMMd&quot;,
 * in en_US, if the largest different calendar field between date1 and date2
 * is &quot;year&quot;, the date interval pattern is &quot;MMM d, yyyy - MMM d, yyyy&quot;,
 * such as &quot;Jan 10, 2007 - Jan 10, 2008&quot;.
 * If the largest different calendar field between date1 and date2 is &quot;month&quot;,
 * the date interval pattern is &quot;MMM d - MMM d, yyyy&quot;,
 * such as &quot;Jan 10 - Feb 10, 2007&quot;.
 * If the largest different calendar field between date1 and date2 is &quot;day&quot;,
 * the date interval pattern is &quot;MMM d-d, yyyy&quot;, such as &quot;Jan 10-20, 2007&quot;.
 *
 * For date skeleton, the interval patterns when year, or month, or date is
 * different are defined in resource files.
 * For time skeleton, the interval patterns when am/pm, or hour, or minute is
 * different are defined in resource files.
 *
 *
 * 
 * There are 2 dates in interval pattern. For most locales, the first date
 * in an interval pattern is the earlier date. There might be a locale in which
 * the first date in an interval pattern is the later date.
 * We use fallback format for the default order for the locale.
 * For example, if the fallback format is &quot;{0} - {1}&quot;, it means
 * the first date in the interval pattern for this locale is earlier date.
 * If the fallback format is &quot;{1} - {0}&quot;, it means the first date is the
 * later date.
 * For a particular interval pattern, the default order can be overriden
 * by prefixing &quot;latestFirst:&quot; or &quot;earliestFirst:&quot; to the interval pattern.
 * For example, if the fallback format is &quot;{0}-{1}&quot;,
 * but for skeleton &quot;yMMMd&quot;, the interval pattern when day is different is
 * &quot;latestFirst:d-d MMM yy&quot;, it means by default, the first date in interval
 * pattern is the earlier date. But for skeleton &quot;yMMMd&quot;, when day is different,
 * the first date in &quot;d-d MMM yy&quot; is the later date.
 *
 * 
 * The recommended way to create a DateIntervalFormat object is to pass in
 * the locale.
 * By using a Locale parameter, the DateIntervalFormat object is
 * initialized with the pre-defined interval patterns for a given or
 * default locale.
 * 
 * Users can also create DateIntervalFormat object
 * by supplying their own interval patterns.
 * It provides flexibility for power users.
 *
 * 
 * After a DateIntervalInfo object is created, clients may modify
 * the interval patterns using setIntervalPattern function as so desired.
 * Currently, users can only set interval patterns when the following
 * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH,
 * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, and MINUTE.
 * Interval patterns when other calendar fields are different is not supported.
 * 
 * DateIntervalInfo objects are cloneable.
 * When clients obtain a DateIntervalInfo object,
 * they can feel free to modify it as necessary.
 * 
 * DateIntervalInfo are not expected to be subclassed.
 * Data for a calendar is loaded out of resource bundles.
 * Through ICU 4.4, date interval patterns are only supported in the Gregorian
 * calendar; non-Gregorian calendars are supported from ICU 4.4.1.
 * @stable ICU 4.0
**/
class U_I18N_API DateIntervalInfo U_FINAL : public UObject {
public:
 /**
 * Default constructor.
 * It does not initialize any interval patterns except
 * that it initialize default fall-back pattern as "{0} - {1}",
 * which can be reset by setFallbackIntervalPattern().
 * It should be followed by setFallbackIntervalPattern() and
 * setIntervalPattern(),
 * and is recommended to be used only for power users who
 * wants to create their own interval patterns and use them to create
 * date interval formatter.
 * @param status output param set to success/failure code on exit
 * @internal ICU 4.0
 */
 DateIntervalInfo(UErrorCode& status);

/**
     * Construct DateIntervalInfo for the given locale,
     * @param locale  the interval patterns are loaded from the appropriate calendar
     *                data (specified calendar or default calendar) in this locale.
     * @param status  output param set to success/failure code on exit
     * @stable ICU 4.0
     */
    DateIntervalInfo(const Locale& locale, UErrorCode& status);

/**
     * Copy constructor.
     * @stable ICU 4.0
     */
    DateIntervalInfo(const DateIntervalInfo&);

/**
     * Assignment operator
     * @stable ICU 4.0
     */
    DateIntervalInfo& operator=(const DateIntervalInfo&);

/**
     * Clone this object polymorphically.
     * The caller owns the result and should delete it when done.
     * @return   a copy of the object
     * @stable ICU 4.0
     */
    virtual DateIntervalInfo* clone() const;

/**
     * Destructor.
     * It is virtual to be safe, but it is not designed to be subclassed.
     * @stable ICU 4.0
     */
    virtual ~DateIntervalInfo();

/**
     * Return true if another object is semantically equal to this one.
     *
     * @param other    the DateIntervalInfo object to be compared with.
     * @return         true if other is semantically equal to this.
     * @stable ICU 4.0
     */
    virtual UBool operator==(const DateIntervalInfo& other) const;

/**
     * Return true if another object is semantically unequal to this one.
     *
     * @param other    the DateIntervalInfo object to be compared with.
     * @return         true if other is semantically unequal to this.
     * @stable ICU 4.0
     */
    UBool operator!=(const DateIntervalInfo& other) const;

/**
 * Provides a way for client to build interval patterns.
 * User could construct DateIntervalInfo by providing a list of skeletons
 * and their patterns.
 * 
 * For example:
 * <pre>
 * UErrorCode status = U_ZERO_ERROR;
 * DateIntervalInfo dIntervalInfo = new DateIntervalInfo();
 * dIntervalInfo->setFallbackIntervalPattern("{0} ~ {1}");
 * dIntervalInfo->setIntervalPattern("yMd", UCAL_YEAR, "'from' yyyy-M-d 'to' yyyy-M-d", status);
 * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_MONTH, "'from' yyyy MMM d 'to' MMM d", status);
 * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_DAY, "yyyy MMM d-d", status, status);
 * </pre>
 *
 * Restriction:
 * Currently, users can only set interval patterns when the following
 * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH,
 * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, and MINUTE.
 * Interval patterns when other calendar fields are different are
 * not supported.
 *
 * @param skeleton the skeleton on which interval pattern based
 * @param lrgDiffCalUnit the largest different calendar unit.
 * @param intervalPattern the interval pattern on the largest different
 * calendar unit.
 * For example, if lrgDiffCalUnit is
 * "year", the interval pattern for en_US when year
 * is different could be "'from' yyyy 'to' yyyy".
 * @param status output param set to success/failure code on exit
 * @stable ICU 4.0
 */
 void setIntervalPattern(const UnicodeString& skeleton,
 UCalendarDateFields lrgDiffCalUnit,
 const UnicodeString& intervalPattern,
 UErrorCode& status);

/**
     * Get the interval pattern given skeleton and
     * the largest different calendar field.
     * @param skeleton   the skeleton
     * @param field      the largest different calendar field
     * @param result     output param to receive the pattern
     * @param status     output param set to success/failure code on exit
     * @return a reference to 'result'
     * @stable ICU 4.0
     */
    UnicodeString& getIntervalPattern(const UnicodeString& skeleton,
                                      UCalendarDateFields field,
                                      UnicodeString& result,
                                      UErrorCode& status) const;

/**
     * Get the fallback interval pattern.
     * @param  result   output param to receive the pattern
     * @return a reference to 'result'
     * @stable ICU 4.0
     */
    UnicodeString& getFallbackIntervalPattern(UnicodeString& result) const;

/**
     * Re-set the fallback interval pattern.
     *
     * In construction, default fallback pattern is set as "{0} - {1}".
     * And constructor taking locale as parameter will set the
     * fallback pattern as what defined in the locale resource file.
     *
     * This method provides a way for user to replace the fallback pattern.
     *
     * @param fallbackPattern  fall-back interval pattern.
     * @param status           output param set to success/failure code on exit
     * @stable ICU 4.0
     */
    void setFallbackIntervalPattern(const UnicodeString& fallbackPattern,
                                    UErrorCode& status);

/** Get default order -- whether the first date in pattern is later date
                             or not.
     * return default date ordering in interval pattern. TRUE if the first date
     *        in pattern is later date, FALSE otherwise.
     * @stable ICU 4.0
     */
    UBool getDefaultOrder() const;

/**
     * ICU "poor man's RTTI", returns a UClassID for the actual class.
     *
     * @stable ICU 4.0
     */
    virtual UClassID getDynamicClassID() const;

/**
     * ICU "poor man's RTTI", returns a UClassID for this class.
     *
     * @stable ICU 4.0
     */
    static UClassID U_EXPORT2 getStaticClassID();

private:
    /**
     * DateIntervalFormat will need access to
     * getBestSkeleton(), parseSkeleton(), enum IntervalPatternIndex,
     * and calendarFieldToPatternIndex().
     *
     * Instead of making above public,
     * make DateIntervalFormat a friend of DateIntervalInfo.
     */
    friend class DateIntervalFormat;

/**
     * Internal struct used to load resource bundle data.
     */
    struct DateIntervalSink;

/**
     * Following is for saving the interval patterns.
     * We only support interval patterns on
     * ERA, YEAR, MONTH, DAY, AM_PM, HOUR, and MINUTE
     */
    enum IntervalPatternIndex
    {
        kIPI_ERA,
        kIPI_YEAR,
        kIPI_MONTH,
        kIPI_DATE,
        kIPI_AM_PM,
        kIPI_HOUR,
        kIPI_MINUTE,
        kIPI_SECOND,
        kIPI_MAX_INDEX
    };
public:
#ifndef U_HIDE_INTERNAL_API
    /**
     * Max index for stored interval patterns
     * @internal ICU 4.4
     */
     enum {
         kMaxIntervalPatternIndex = kIPI_MAX_INDEX
     };
#endif  /* U_HIDE_INTERNAL_API */
private:

/**
     * Initialize the DateIntervalInfo from locale
     * @param locale   the given locale.
     * @param status   output param set to success/failure code on exit
     */
    void initializeData(const Locale& locale, UErrorCode& status);

/* Set Interval pattern.
     *
     * It sets interval pattern into the hash map.
     *
     * @param skeleton         skeleton on which the interval pattern based
     * @param lrgDiffCalUnit   the largest different calendar unit.
     * @param intervalPattern  the interval pattern on the largest different
     *                         calendar unit.
     * @param status           output param set to success/failure code on exit
     */
    void setIntervalPatternInternally(const UnicodeString& skeleton,
                                      UCalendarDateFields lrgDiffCalUnit,
                                      const UnicodeString& intervalPattern,
                                      UErrorCode& status);

/**given an input skeleton, get the best match skeleton
     * which has pre-defined interval pattern in resource file.
     * Also return the difference between the input skeleton
     * and the best match skeleton.
     *
     * TODO (xji): set field weight or
     *             isolate the funtionality in DateTimePatternGenerator
     * @param  skeleton               input skeleton
     * @param  bestMatchDistanceInfo  the difference between input skeleton
     *                                and best match skeleton.
     *         0, if there is exact match for input skeleton
     *         1, if there is only field width difference between
     *            the best match and the input skeleton
     *         2, the only field difference is 'v' and 'z'
     *        -1, if there is calendar field difference between
     *            the best match and the input skeleton
     * @return                        best match skeleton
     */
    const UnicodeString* getBestSkeleton(const UnicodeString& skeleton,
                                         int8_t& bestMatchDistanceInfo) const;

/**
     * Parse skeleton, save each field's width.
     * It is used for looking for best match skeleton,
     * and adjust pattern field width.
     * @param skeleton            skeleton to be parsed
     * @param skeletonFieldWidth  parsed skeleton field width
     */
    static void U_EXPORT2 parseSkeleton(const UnicodeString& skeleton,
                                        int32_t* skeletonFieldWidth);

/**
     * Check whether one field width is numeric while the other is string.
     *
     * TODO (xji): make it general
     *
     * @param fieldWidth          one field width
     * @param anotherFieldWidth   another field width
     * @param patternLetter       pattern letter char
     * @return true if one field width is numeric and the other is string,
     *         false otherwise.
     */
    static UBool U_EXPORT2 stringNumeric(int32_t fieldWidth,
                                         int32_t anotherFieldWidth,
                                         char patternLetter);

/**
     * Convert calendar field to the interval pattern index in
     * hash table.
     *
     * Since we only support the following calendar fields:
     * ERA, YEAR, MONTH, DATE,  DAY_OF_MONTH, DAY_OF_WEEK,
     * AM_PM,  HOUR, HOUR_OF_DAY, and MINUTE,
     * We reserve only 4 interval patterns for a skeleton.
     *
     * @param field    calendar field
     * @param status   output param set to success/failure code on exit
     * @return  interval pattern index in hash table
     */
    static IntervalPatternIndex U_EXPORT2 calendarFieldToIntervalIndex(
                                                      UCalendarDateFields field,
                                                      UErrorCode& status);

/**
     * delete hash table (of type fIntervalPatterns).
     *
     * @param hTable  hash table to be deleted
     */
    void deleteHash(Hashtable* hTable);

/**
     * initialize hash table (of type fIntervalPatterns).
     *
     * @param status   output param set to success/failure code on exit
     * @return         hash table initialized
     */
    Hashtable* initHash(UErrorCode& status);

/**
     * copy hash table (of type fIntervalPatterns).
     *
     * @param source   the source to copy from
     * @param target   the target to copy to
     * @param status   output param set to success/failure code on exit
     */
    void copyHash(const Hashtable* source, Hashtable* target, UErrorCode& status);

// data members
    // fallback interval pattern
    UnicodeString fFallbackIntervalPattern;
    // default order
    UBool fFirstDateInPtnIsLaterDate;

// HashMap<UnicodeString, UnicodeString[kIPI_MAX_INDEX]>
 // HashMap( skeleton, pattern[largest_different_field] )
 Hashtable* fIntervalPatterns;

};// end class DateIntervalInfo

inline UBool
DateIntervalInfo::operator!=(const DateIntervalInfo& other) const {
    return !operator==(other);
}

U_NAMESPACE_END

#endif

#endif /* U_SHOW_CPLUSPLUS_API */

#endif

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