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scuffed-code/icu4c/source/i18n/unicode/dtptngen.h
Peter Edberg 98723ad2bd ICU-7180 For hour field, change default behavior to not adjust pattern 
field length to match requested skeleton. For getBestPattern,replaceFieldTypes
add option to override this, forcing pattern field length to match skeleton.

X-SVN-Rev: 27036
2009-12-10 09:13:49 +00:00

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/*
*******************************************************************************
* Copyright (C) 2007-2009, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*
* File DTPTNGEN.H
*
*******************************************************************************
*/
#ifndef __DTPTNGEN_H__
#define __DTPTNGEN_H__
#include "unicode/datefmt.h"
#include "unicode/locid.h"
#include "unicode/udat.h"
#include "unicode/udatpg.h"
U_NAMESPACE_BEGIN
/**
* \file
* \brief C++ API: Date/Time Pattern Generator
*/
class Hashtable;
class FormatParser;
class DateTimeMatcher;
class DistanceInfo;
class PatternMap;
class PtnSkeleton;
/**
* This class provides flexible generation of date format patterns, like "yy-MM-dd".
* The user can build up the generator by adding successive patterns. Once that
* is done, a query can be made using a "skeleton", which is a pattern which just
* includes the desired fields and lengths. The generator will return the "best fit"
* pattern corresponding to that skeleton.
* <p>The main method people will use is getBestPattern(String skeleton),
* since normally this class is pre-built with data from a particular locale.
* However, generators can be built directly from other data as well.
* <p><i>Issue: may be useful to also have a function that returns the list of
* fields in a pattern, in order, since we have that internally.
* That would be useful for getting the UI order of field elements.</i>
* @stable ICU 3.8
**/
class U_I18N_API DateTimePatternGenerator : public UObject {
public:
/**
* Construct a flexible generator according to default locale.
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @stable ICU 3.8
*/
static DateTimePatternGenerator* U_EXPORT2 createInstance(UErrorCode& status);
/**
* Construct a flexible generator according to data for a given locale.
* @param uLocale
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @stable ICU 3.8
*/
static DateTimePatternGenerator* U_EXPORT2 createInstance(const Locale& uLocale, UErrorCode& status);
/**
* Create an empty generator, to be constructed with addPattern(...) etc.
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @stable ICU 3.8
*/
static DateTimePatternGenerator* U_EXPORT2 createEmptyInstance(UErrorCode& status);
/**
* Destructor.
* @stable ICU 3.8
*/
virtual ~DateTimePatternGenerator();
/**
* Clone DateTimePatternGenerator object. Clients are responsible for
* deleting the DateTimePatternGenerator object cloned.
* @stable ICU 3.8
*/
DateTimePatternGenerator* clone() const;
/**
* Return true if another object is semantically equal to this one.
*
* @param other the DateTimePatternGenerator object to be compared with.
* @return true if other is semantically equal to this.
* @stable ICU 3.8
*/
UBool operator==(const DateTimePatternGenerator& other) const;
/**
* Return true if another object is semantically unequal to this one.
*
* @param other the DateTimePatternGenerator object to be compared with.
* @return true if other is semantically unequal to this.
* @stable ICU 3.8
*/
UBool operator!=(const DateTimePatternGenerator& other) const;
/**
* Utility to return a unique skeleton from a given pattern. For example,
* both "MMM-dd" and "dd/MMM" produce the skeleton "MMMdd".
*
* @param pattern Input pattern, such as "dd/MMM"
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return skeleton such as "MMMdd"
* @stable ICU 3.8
*/
UnicodeString getSkeleton(const UnicodeString& pattern, UErrorCode& status);
/**
* Utility to return a unique base skeleton from a given pattern. This is
* the same as the skeleton, except that differences in length are minimized
* so as to only preserve the difference between string and numeric form. So
* for example, both "MMM-dd" and "d/MMM" produce the skeleton "MMMd"
* (notice the single d).
*
* @param pattern Input pattern, such as "dd/MMM"
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return base skeleton, such as "Md"
* @stable ICU 3.8
*/
UnicodeString getBaseSkeleton(const UnicodeString& pattern, UErrorCode& status);
/**
* Adds a pattern to the generator. If the pattern has the same skeleton as
* an existing pattern, and the override parameter is set, then the previous
* value is overriden. Otherwise, the previous value is retained. In either
* case, the conflicting status is set and previous vale is stored in
* conflicting pattern.
* <p>
* Note that single-field patterns (like "MMM") are automatically added, and
* don't need to be added explicitly!
*
* @param pattern Input pattern, such as "dd/MMM"
* @param override When existing values are to be overridden use true,
* otherwise use false.
* @param conflictingPattern Previous pattern with the same skeleton.
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return conflicting status. The value could be UDATPG_NO_CONFLICT,
* UDATPG_BASE_CONFLICT or UDATPG_CONFLICT.
* @stable ICU 3.8
*/
UDateTimePatternConflict addPattern(const UnicodeString& pattern,
UBool override,
UnicodeString& conflictingPattern,
UErrorCode& status);
/**
* An AppendItem format is a pattern used to append a field if there is no
* good match. For example, suppose that the input skeleton is "GyyyyMMMd",
* and there is no matching pattern internally, but there is a pattern
* matching "yyyyMMMd", say "d-MM-yyyy". Then that pattern is used, plus the
* G. The way these two are conjoined is by using the AppendItemFormat for G
* (era). So if that value is, say "{0}, {1}" then the final resulting
* pattern is "d-MM-yyyy, G".
* <p>
* There are actually three available variables: {0} is the pattern so far,
* {1} is the element we are adding, and {2} is the name of the element.
* <p>
* This reflects the way that the CLDR data is organized.
*
* @param field such as UDATPG_ERA_FIELD.
* @param value pattern, such as "{0}, {1}"
* @stable ICU 3.8
*/
void setAppendItemFormat(UDateTimePatternField field, const UnicodeString& value);
/**
* Getter corresponding to setAppendItemFormat. Values below 0 or at or
* above UDATPG_FIELD_COUNT are illegal arguments.
*
* @param field such as UDATPG_ERA_FIELD.
* @return append pattern for field
* @stable ICU 3.8
*/
const UnicodeString& getAppendItemFormat(UDateTimePatternField field) const;
/**
* Sets the names of field, eg "era" in English for ERA. These are only
* used if the corresponding AppendItemFormat is used, and if it contains a
* {2} variable.
* <p>
* This reflects the way that the CLDR data is organized.
*
* @param field such as UDATPG_ERA_FIELD.
* @param value name of the field
* @stable ICU 3.8
*/
void setAppendItemName(UDateTimePatternField field, const UnicodeString& value);
/**
* Getter corresponding to setAppendItemNames. Values below 0 or at or above
* UDATPG_FIELD_COUNT are illegal arguments.
*
* @param field such as UDATPG_ERA_FIELD.
* @return name for field
* @stable ICU 3.8
*/
const UnicodeString& getAppendItemName(UDateTimePatternField field) const;
/**
* The date time format is a message format pattern used to compose date and
* time patterns. The default value is "{0} {1}", where {0} will be replaced
* by the date pattern and {1} will be replaced by the time pattern.
* <p>
* This is used when the input skeleton contains both date and time fields,
* but there is not a close match among the added patterns. For example,
* suppose that this object was created by adding "dd-MMM" and "hh:mm", and
* its datetimeFormat is the default "{0} {1}". Then if the input skeleton
* is "MMMdhmm", there is not an exact match, so the input skeleton is
* broken up into two components "MMMd" and "hmm". There are close matches
* for those two skeletons, so the result is put together with this pattern,
* resulting in "d-MMM h:mm".
*
* @param dateTimeFormat
* message format pattern, here {0} will be replaced by the date
* pattern and {1} will be replaced by the time pattern.
* @stable ICU 3.8
*/
void setDateTimeFormat(const UnicodeString& dateTimeFormat);
/**
* Getter corresponding to setDateTimeFormat.
* @return DateTimeFormat.
* @stable ICU 3.8
*/
const UnicodeString& getDateTimeFormat() const;
/**
* Return the best pattern matching the input skeleton. It is guaranteed to
* have all of the fields in the skeleton.
*
* @param skeleton
* The skeleton is a pattern containing only the variable fields.
* For example, "MMMdd" and "mmhh" are skeletons.
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return bestPattern
* The best pattern found from the given skeleton.
* @stable ICU 3.8
*/
UnicodeString getBestPattern(const UnicodeString& skeleton, UErrorCode& status);
/**
* Return the best pattern matching the input skeleton. It is guaranteed to
* have all of the fields in the skeleton.
*
* @param skeleton
* The skeleton is a pattern containing only the variable fields.
* For example, "MMMdd" and "mmhh" are skeletons.
* @param options
* Options for forcing the length of specified fields in the
* returned pattern to match those in the skeleton (when this
* would not happen otherwise). For default behavior, use
* UDATPG_MATCH_NO_OPTIONS.
* @param status
* Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return bestPattern
* The best pattern found from the given skeleton.
* @draft ICU 4.4
*/
UnicodeString getBestPattern(const UnicodeString& skeleton,
UDateTimePatternMatchOptions options,
UErrorCode& status);
/**
* Adjusts the field types (width and subtype) of a pattern to match what is
* in a skeleton. That is, if you supply a pattern like "d-M H:m", and a
* skeleton of "MMMMddhhmm", then the input pattern is adjusted to be
* "dd-MMMM hh:mm". This is used internally to get the best match for the
* input skeleton, but can also be used externally.
*
* @param pattern Input pattern
* @param skeleton
* The skeleton is a pattern containing only the variable fields.
* For example, "MMMdd" and "mmhh" are skeletons.
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return pattern adjusted to match the skeleton fields widths and subtypes.
* @stable ICU 3.8
*/
UnicodeString replaceFieldTypes(const UnicodeString& pattern,
const UnicodeString& skeleton,
UErrorCode& status);
/**
* Adjusts the field types (width and subtype) of a pattern to match what is
* in a skeleton. That is, if you supply a pattern like "d-M H:m", and a
* skeleton of "MMMMddhhmm", then the input pattern is adjusted to be
* "dd-MMMM hh:mm". This is used internally to get the best match for the
* input skeleton, but can also be used externally.
*
* @param pattern Input pattern
* @param skeleton
* The skeleton is a pattern containing only the variable fields.
* For example, "MMMdd" and "mmhh" are skeletons.
* @param options
* Options controlling whether the length of specified fields in the
* pattern are adjusted to match those in the skeleton (when this
* would not happen otherwise). For default behavior, use
* UDATPG_MATCH_NO_OPTIONS.
* @param status
* Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return pattern adjusted to match the skeleton fields widths and subtypes.
* @draft ICU 4.4
*/
UnicodeString replaceFieldTypes(const UnicodeString& pattern,
const UnicodeString& skeleton,
UDateTimePatternMatchOptions options,
UErrorCode& status);
/**
* Return a list of all the skeletons (in canonical form) from this class.
*
* Call getPatternForSkeleton() to get the corresponding pattern.
*
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return StringEnumeration with the skeletons.
* The caller must delete the object.
* @stable ICU 3.8
*/
StringEnumeration* getSkeletons(UErrorCode& status) const;
/**
* Get the pattern corresponding to a given skeleton.
* @param skeleton
* @return pattern corresponding to a given skeleton.
* @stable ICU 3.8
*/
const UnicodeString& getPatternForSkeleton(const UnicodeString& skeleton) const;
/**
* Return a list of all the base skeletons (in canonical form) from this class.
*
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return a StringEnumeration with the base skeletons.
* The caller must delete the object.
* @stable ICU 3.8
*/
StringEnumeration* getBaseSkeletons(UErrorCode& status) const;
/**
* Return a list of redundant patterns are those which if removed, make no
* difference in the resulting getBestPattern values. This method returns a
* list of them, to help check the consistency of the patterns used to build
* this generator.
*
* @param status Output param set to success/failure code on exit,
* which must not indicate a failure before the function call.
* @return a StringEnumeration with the redundant pattern.
* The caller must delete the object.
* @internal ICU 3.8
*/
StringEnumeration* getRedundants(UErrorCode& status);
/**
* The decimal value is used in formatting fractions of seconds. If the
* skeleton contains fractional seconds, then this is used with the
* fractional seconds. For example, suppose that the input pattern is
* "hhmmssSSSS", and the best matching pattern internally is "H:mm:ss", and
* the decimal string is ",". Then the resulting pattern is modified to be
* "H:mm:ss,SSSS"
*
* @param decimal
* @stable ICU 3.8
*/
void setDecimal(const UnicodeString& decimal);
/**
* Getter corresponding to setDecimal.
* @return UnicodeString corresponding to the decimal point
* @stable ICU 3.8
*/
const UnicodeString& getDecimal() const;
/**
* ICU "poor man's RTTI", returns a UClassID for the actual class.
*
* @stable ICU 3.8
*/
virtual UClassID getDynamicClassID() const;
/**
* ICU "poor man's RTTI", returns a UClassID for this class.
*
* @stable ICU 3.8
*/
static UClassID U_EXPORT2 getStaticClassID(void);
private:
/**
* Constructor.
* @stable ICU 3.8
*/
DateTimePatternGenerator(UErrorCode & status);
/**
* Constructor.
* @stable ICU 3.8
*/
DateTimePatternGenerator(const Locale& locale, UErrorCode & status);
/**
* Copy constructor.
* @param other DateTimePatternGenerator to copy
* @stable ICU 3.8
*/
DateTimePatternGenerator(const DateTimePatternGenerator& other);
/**
* Default assignment operator.
* @param other DateTimePatternGenerator to copy
* @stable ICU 3.8
*/
DateTimePatternGenerator& operator=(const DateTimePatternGenerator& other);
Locale pLocale; // pattern locale
FormatParser *fp;
DateTimeMatcher* dtMatcher;
DistanceInfo *distanceInfo;
PatternMap *patternMap;
UnicodeString appendItemFormats[UDATPG_FIELD_COUNT];
UnicodeString appendItemNames[UDATPG_FIELD_COUNT];
UnicodeString dateTimeFormat;
UnicodeString decimal;
DateTimeMatcher *skipMatcher;
Hashtable *fAvailableFormatKeyHash;
UnicodeString hackPattern;
UnicodeString emptyString;
UChar fDefaultHourFormatChar;
void initData(const Locale &locale, UErrorCode &status);
void addCanonicalItems();
void addICUPatterns(const Locale& locale, UErrorCode& status);
void hackTimes(const UnicodeString& hackPattern, UErrorCode& status);
void addCLDRData(const Locale& locale, UErrorCode& status);
UDateTimePatternConflict addPatternWithSkeleton(const UnicodeString& pattern, const UnicodeString * skeletonToUse, UBool override, UnicodeString& conflictingPattern, UErrorCode& status);
void initHashtable(UErrorCode& status);
void setDateTimeFromCalendar(const Locale& locale, UErrorCode& status);
void setDecimalSymbols(const Locale& locale, UErrorCode& status);
UDateTimePatternField getAppendFormatNumber(const char* field) const;
UDateTimePatternField getAppendNameNumber(const char* field) const;
void getAppendName(UDateTimePatternField field, UnicodeString& value);
int32_t getCanonicalIndex(const UnicodeString& field);
const UnicodeString* getBestRaw(DateTimeMatcher& source, int32_t includeMask, DistanceInfo* missingFields, const PtnSkeleton** specifiedSkeletonPtr = 0);
UnicodeString adjustFieldTypes(const UnicodeString& pattern, const PtnSkeleton* specifiedSkeleton, UBool fixFractionalSeconds, UDateTimePatternMatchOptions options = UDATPG_MATCH_NO_OPTIONS);
UnicodeString getBestAppending(int32_t missingFields, UDateTimePatternMatchOptions options = UDATPG_MATCH_NO_OPTIONS);
int32_t getTopBitNumber(int32_t foundMask);
void setAvailableFormat(const UnicodeString &key, UErrorCode& status);
UBool isAvailableFormatSet(const UnicodeString &key) const;
void copyHashtable(Hashtable *other, UErrorCode &status);
UBool isCanonicalItem(const UnicodeString& item) const;
} ;// end class DateTimePatternGenerator
U_NAMESPACE_END
#endif
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