[apple/icu.git] / icuSources / i18n / unicode / format.h

/*
********************************************************************************
* Copyright (C) 1997-2011, International Business Machines Corporation and others.
* All Rights Reserved.
********************************************************************************
*
* File FORMAT.H
*
* Modification History:
*
*   Date        Name        Description
*   02/19/97    aliu        Converted from java.
*   03/17/97    clhuang     Updated per C++ implementation.
*   03/27/97    helena      Updated to pass the simple test after code review.
********************************************************************************
*/
// *****************************************************************************
// This file was generated from the java source file Format.java
// *****************************************************************************

#ifndef FORMAT_H
#define FORMAT_H


#include "unicode/utypes.h"

/**
 * \file 
 * \brief C++ API: Base class for all formats. 
 */

#if !UCONFIG_NO_FORMATTING

#include "unicode/unistr.h"
#include "unicode/fmtable.h"
#include "unicode/fieldpos.h"
#include "unicode/fpositer.h"
#include "unicode/parsepos.h"
#include "unicode/parseerr.h" 
#include "unicode/locid.h"

U_NAMESPACE_BEGIN

/**
 * Base class for all formats.  This is an abstract base class which
 * specifies the protocol for classes which convert other objects or
 * values, such as numeric values and dates, and their string
 * representations.  In some cases these representations may be
 * localized or contain localized characters or strings.  For example,
 * a numeric formatter such as DecimalFormat may convert a numeric
 * value such as 12345 to the string "$12,345".  It may also parse
 * the string back into a numeric value.  A date and time formatter
 * like SimpleDateFormat may represent a specific date, encoded
 * numerically, as a string such as "Wednesday, February 26, 1997 AD".
 * <P>
 * Many of the concrete subclasses of Format employ the notion of
 * a pattern.  A pattern is a string representation of the rules which
 * govern the interconversion between values and strings.  For example,
 * a DecimalFormat object may be associated with the pattern
 * "$#,##0.00;($#,##0.00)", which is a common US English format for
 * currency values, yielding strings such as "$1,234.45" for 1234.45,
 * and "($987.65)" for 987.6543.  The specific syntax of a pattern
 * is defined by each subclass.
 * <P>
 * Even though many subclasses use patterns, the notion of a pattern
 * is not inherent to Format classes in general, and is not part of
 * the explicit base class protocol.
 * <P>
 * Two complex formatting classes bear mentioning.  These are
 * MessageFormat and ChoiceFormat.  ChoiceFormat is a subclass of
 * NumberFormat which allows the user to format different number ranges
 * as strings.  For instance, 0 may be represented as "no files", 1 as
 * "one file", and any number greater than 1 as "many files".
 * MessageFormat is a formatter which utilizes other Format objects to
 * format a string containing with multiple values.  For instance,
 * A MessageFormat object might produce the string "There are no files
 * on the disk MyDisk on February 27, 1997." given the arguments 0,
 * "MyDisk", and the date value of 2/27/97.  See the ChoiceFormat
 * and MessageFormat headers for further information.
 * <P>
 * If formatting is unsuccessful, a failing UErrorCode is returned when
 * the Format cannot format the type of object, otherwise if there is
 * something illformed about the the Unicode replacement character
 * 0xFFFD is returned.
 * <P>
 * If there is no match when parsing, a parse failure UErrorCode is
 * retured for methods which take no ParsePosition.  For the method
 * that takes a ParsePosition, the index parameter is left unchanged.
 * <P>
 * <em>User subclasses are not supported.</em> While clients may write
 * subclasses, such code will not necessarily work and will not be
 * guaranteed to work stably from release to release.
 */
class U_I18N_API Format : public UObject {
public:

    /** Destructor
     * @stable ICU 2.4
     */
    virtual ~Format();

    /**
     * Return true if the given Format objects are semantically equal.
     * Objects of different subclasses are considered unequal.
     * @param other    the object to be compared with.
     * @return         Return true if the given Format objects are semantically equal.
     *                 Objects of different subclasses are considered unequal.
     * @stable ICU 2.0
     */
    virtual UBool operator==(const Format& other) const = 0;

    /**
     * Return true if the given Format objects are not semantically
     * equal.
     * @param other    the object to be compared with.
     * @return         Return true if the given Format objects are not semantically.
     * @stable ICU 2.0
     */
    UBool operator!=(const Format& other) const { return !operator==(other); }

    /**
     * Clone this object polymorphically.  The caller is responsible
     * for deleting the result when done.
     * @return    A copy of the object
     * @stable ICU 2.0
     */
    virtual Format* clone() const = 0;

    /**
     * Formats an object to produce a string.
     *
     * @param obj       The object to format.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param status    Output parameter filled in with success or failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.0
     */
    UnicodeString& format(const Formattable& obj,
                          UnicodeString& appendTo,
                          UErrorCode& status) const;

    /**
     * Format an object to produce a string.  This is a pure virtual method which
     * subclasses must implement. This method allows polymorphic formatting
     * of Formattable objects. If a subclass of Format receives a Formattable
     * object type it doesn't handle (e.g., if a numeric Formattable is passed
     * to a DateFormat object) then it returns a failing UErrorCode.
     *
     * @param obj       The object to format.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param pos       On input: an alignment field, if desired.
     *                  On output: the offsets of the alignment field.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 2.0
     */
    virtual UnicodeString& format(const Formattable& obj,
                                  UnicodeString& appendTo,
                                  FieldPosition& pos,
                                  UErrorCode& status) const = 0;
    /**
     * Format an object to produce a string.  Subclasses should override this
     * method. This method allows polymorphic formatting of Formattable objects.
     * If a subclass of Format receives a Formattable object type it doesn't
     * handle (e.g., if a numeric Formattable is passed to a DateFormat object)
     * then it returns a failing UErrorCode.
     *
     * @param obj       The object to format.
     * @param appendTo  Output parameter to receive result.
     *                  Result is appended to existing contents.
     * @param posIter   On return, can be used to iterate over positions
     *                  of fields generated by this format call.
     * @param status    Output param filled with success/failure status.
     * @return          Reference to 'appendTo' parameter.
     * @stable ICU 4.4
     */
    virtual UnicodeString& format(const Formattable& obj,
                                  UnicodeString& appendTo,
                                  FieldPositionIterator* posIter,
                                  UErrorCode& status) const;

    /**
     * Parse a string to produce an object.  This is a pure virtual
     * method which subclasses must implement.  This method allows
     * polymorphic parsing of strings into Formattable objects.
     * <P>
     * Before calling, set parse_pos.index to the offset you want to
     * start parsing at in the source.  After calling, parse_pos.index
     * is the end of the text you parsed.  If error occurs, index is
     * unchanged.
     * <P>
     * When parsing, leading whitespace is discarded (with successful
     * parse), while trailing whitespace is left as is.
     * <P>
     * Example:
     * <P>
     * Parsing "_12_xy" (where _ represents a space) for a number,
     * with index == 0 will result in the number 12, with
     * parse_pos.index updated to 3 (just before the second space).
     * Parsing a second time will result in a failing UErrorCode since
     * "xy" is not a number, and leave index at 3.
     * <P>
     * Subclasses will typically supply specific parse methods that
     * return different types of values. Since methods can't overload
     * on return types, these will typically be named "parse", while
     * this polymorphic method will always be called parseObject.  Any
     * parse method that does not take a parse_pos should set status
     * to an error value when no text in the required format is at the
     * start position.
     *
     * @param source    The string to be parsed into an object.
     * @param result    Formattable to be set to the parse result.
     *                  If parse fails, return contents are undefined.
     * @param parse_pos The position to start parsing at. Upon return
     *                  this param is set to the position after the
     *                  last character successfully parsed. If the
     *                  source is not parsed successfully, this param
     *                  will remain unchanged.
     * @stable ICU 2.0
     */
    virtual void parseObject(const UnicodeString& source,
                             Formattable& result,
                             ParsePosition& parse_pos) const = 0;

    /**
     * Parses a string to produce an object. This is a convenience method
     * which calls the pure virtual parseObject() method, and returns a
     * failure UErrorCode if the ParsePosition indicates failure.
     *
     * @param source    The string to be parsed into an object.
     * @param result    Formattable to be set to the parse result.
     *                  If parse fails, return contents are undefined.
     * @param status    Output param to be filled with success/failure
     *                  result code.
     * @stable ICU 2.0
     */
    void parseObject(const UnicodeString& source,
                     Formattable& result,
                     UErrorCode& status) const;

    /** Get the locale for this format object. You can choose between valid and actual locale.
     *  @param type type of the locale we're looking for (valid or actual) 
     *  @param status error code for the operation
     *  @return the locale
     *  @stable ICU 2.8
     */
    Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const;

#ifndef U_HIDE_INTERNAL_API
    /** Get the locale for this format object. You can choose between valid and actual locale.
     *  @param type type of the locale we're looking for (valid or actual) 
     *  @param status error code for the operation
     *  @return the locale
     *  @internal
     */
    const char* getLocaleID(ULocDataLocaleType type, UErrorCode &status) const;
#endif  /* U_HIDE_INTERNAL_API */

 protected:
    /** @stable ICU 2.8 */
    void setLocaleIDs(const char* valid, const char* actual);

protected:
    /**
     * Default constructor for subclass use only.  Does nothing.
     * @stable ICU 2.0
     */
    Format();

    /**
     * @stable ICU 2.0
     */
    Format(const Format&); // Does nothing; for subclasses only

    /**
     * @stable ICU 2.0
     */
    Format& operator=(const Format&); // Does nothing; for subclasses

       
    /**
     * Simple function for initializing a UParseError from a UnicodeString.
     *
     * @param pattern The pattern to copy into the parseError
     * @param pos The position in pattern where the error occured
     * @param parseError The UParseError object to fill in
     * @stable ICU 2.4
     */
    static void syntaxError(const UnicodeString& pattern,
                            int32_t pos,
                            UParseError& parseError);

 private:
    char actualLocale[ULOC_FULLNAME_CAPACITY];
    char validLocale[ULOC_FULLNAME_CAPACITY];
};

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif // _FORMAT
//eof
Commit	Line	Data
b75a7d8f A	1	/*
b75a7d8f A	2	********************************************************************************
4388f060	3	* Copyright (C) 1997-2011, International Business Machines Corporation and others.
73c04bcf	4	* All Rights Reserved.
b75a7d8f A	5	********************************************************************************
	6	*
	7	* File FORMAT.H
	8	*
	9	* Modification History:
	10	*
	11	* Date Name Description
	12	* 02/19/97 aliu Converted from java.
	13	* 03/17/97 clhuang Updated per C++ implementation.
	14	* 03/27/97 helena Updated to pass the simple test after code review.
	15	********************************************************************************
	16	*/
	17	// *****************************************************************************
	18	// This file was generated from the java source file Format.java
	19	// *****************************************************************************
	20
	21	#ifndef FORMAT_H
	22	#define FORMAT_H
	23
	24
	25	#include "unicode/utypes.h"
	26
73c04bcf A	27	/**
	28	* \file
	29	* \brief C++ API: Base class for all formats.
	30	*/
	31
b75a7d8f A	32	#if !UCONFIG_NO_FORMATTING
b75a7d8f A	33
b75a7d8f A	34	#include "unicode/unistr.h"
	35	#include "unicode/fmtable.h"
	36	#include "unicode/fieldpos.h"
729e4ab9	37	#include "unicode/fpositer.h"
b75a7d8f A	38	#include "unicode/parsepos.h"
b75a7d8f A	39	#include "unicode/parseerr.h"
374ca955	40	#include "unicode/locid.h"
b75a7d8f A	41
b75a7d8f A	42	U_NAMESPACE_BEGIN
374ca955	43
b75a7d8f A	44	/**
	45	* Base class for all formats. This is an abstract base class which
	46	* specifies the protocol for classes which convert other objects or
	47	* values, such as numeric values and dates, and their string
	48	* representations. In some cases these representations may be
	49	* localized or contain localized characters or strings. For example,
	50	* a numeric formatter such as DecimalFormat may convert a numeric
	51	* value such as 12345 to the string "$12,345". It may also parse
	52	* the string back into a numeric value. A date and time formatter
	53	* like SimpleDateFormat may represent a specific date, encoded
	54	* numerically, as a string such as "Wednesday, February 26, 1997 AD".
	55	* <P>
	56	* Many of the concrete subclasses of Format employ the notion of
	57	* a pattern. A pattern is a string representation of the rules which
	58	* govern the interconversion between values and strings. For example,
	59	* a DecimalFormat object may be associated with the pattern
	60	* "$#,##0.00;($#,##0.00)", which is a common US English format for
	61	* currency values, yielding strings such as "$1,234.45" for 1234.45,
	62	* and "($987.65)" for 987.6543. The specific syntax of a pattern
	63	* is defined by each subclass.
	64	* <P>
	65	* Even though many subclasses use patterns, the notion of a pattern
	66	* is not inherent to Format classes in general, and is not part of
	67	* the explicit base class protocol.
	68	* <P>
	69	* Two complex formatting classes bear mentioning. These are
	70	* MessageFormat and ChoiceFormat. ChoiceFormat is a subclass of
	71	* NumberFormat which allows the user to format different number ranges
	72	* as strings. For instance, 0 may be represented as "no files", 1 as
	73	* "one file", and any number greater than 1 as "many files".
	74	* MessageFormat is a formatter which utilizes other Format objects to
	75	* format a string containing with multiple values. For instance,
	76	* A MessageFormat object might produce the string "There are no files
	77	* on the disk MyDisk on February 27, 1997." given the arguments 0,
	78	* "MyDisk", and the date value of 2/27/97. See the ChoiceFormat
	79	* and MessageFormat headers for further information.
	80	* <P>
	81	* If formatting is unsuccessful, a failing UErrorCode is returned when
	82	* the Format cannot format the type of object, otherwise if there is
	83	* something illformed about the the Unicode replacement character
	84	* 0xFFFD is returned.
	85	* <P>
	86	* If there is no match when parsing, a parse failure UErrorCode is
	87	* retured for methods which take no ParsePosition. For the method
	88	* that takes a ParsePosition, the index parameter is left unchanged.
	89	* <P>
374ca955 A	90	* <em>User subclasses are not supported.</em> While clients may write
	91	* subclasses, such code will not necessarily work and will not be
	92	* guaranteed to work stably from release to release.
b75a7d8f A	93	*/
	94	class U_I18N_API Format : public UObject {
	95	public:
	96
	97	/** Destructor
374ca955	98	* @stable ICU 2.4
b75a7d8f A	99	*/
	100	virtual ~Format();
	101
	102	/**
	103	* Return true if the given Format objects are semantically equal.
	104	* Objects of different subclasses are considered unequal.
	105	* @param other the object to be compared with.
	106	* @return Return true if the given Format objects are semantically equal.
	107	* Objects of different subclasses are considered unequal.
	108	* @stable ICU 2.0
	109	*/
	110	virtual UBool operator==(const Format& other) const = 0;
	111
	112	/**
	113	* Return true if the given Format objects are not semantically
	114	* equal.
	115	* @param other the object to be compared with.
	116	* @return Return true if the given Format objects are not semantically.
	117	* @stable ICU 2.0
	118	*/
	119	UBool operator!=(const Format& other) const { return !operator==(other); }
	120
	121	/**
	122	* Clone this object polymorphically. The caller is responsible
	123	* for deleting the result when done.
	124	* @return A copy of the object
	125	* @stable ICU 2.0
	126	*/
	127	virtual Format* clone() const = 0;
	128
	129	/**
	130	* Formats an object to produce a string.
	131	*
	132	* @param obj The object to format.
	133	* @param appendTo Output parameter to receive result.
	134	* Result is appended to existing contents.
	135	* @param status Output parameter filled in with success or failure status.
	136	* @return Reference to 'appendTo' parameter.
	137	* @stable ICU 2.0
	138	*/
	139	UnicodeString& format(const Formattable& obj,
	140	UnicodeString& appendTo,
	141	UErrorCode& status) const;
	142
	143	/**
	144	* Format an object to produce a string. This is a pure virtual method which
	145	* subclasses must implement. This method allows polymorphic formatting
	146	* of Formattable objects. If a subclass of Format receives a Formattable
	147	* object type it doesn't handle (e.g., if a numeric Formattable is passed
	148	* to a DateFormat object) then it returns a failing UErrorCode.
	149	*
	150	* @param obj The object to format.
	151	* @param appendTo Output parameter to receive result.
	152	* Result is appended to existing contents.
	153	* @param pos On input: an alignment field, if desired.
	154	* On output: the offsets of the alignment field.
	155	* @param status Output param filled with success/failure status.
	156	* @return Reference to 'appendTo' parameter.
	157	* @stable ICU 2.0
	158	*/
	159	virtual UnicodeString& format(const Formattable& obj,
	160	UnicodeString& appendTo,
	161	FieldPosition& pos,
	162	UErrorCode& status) const = 0;
729e4ab9 A	163	/**
	164	* Format an object to produce a string. Subclasses should override this
	165	* method. This method allows polymorphic formatting of Formattable objects.
	166	* If a subclass of Format receives a Formattable object type it doesn't
	167	* handle (e.g., if a numeric Formattable is passed to a DateFormat object)
	168	* then it returns a failing UErrorCode.
	169	*
	170	* @param obj The object to format.
	171	* @param appendTo Output parameter to receive result.
	172	* Result is appended to existing contents.
	173	* @param posIter On return, can be used to iterate over positions
	174	* of fields generated by this format call.
	175	* @param status Output param filled with success/failure status.
	176	* @return Reference to 'appendTo' parameter.
	177	* @stable ICU 4.4
	178	*/
	179	virtual UnicodeString& format(const Formattable& obj,
	180	UnicodeString& appendTo,
	181	FieldPositionIterator* posIter,
	182	UErrorCode& status) const;
b75a7d8f A	183
	184	/**
	185	* Parse a string to produce an object. This is a pure virtual
	186	* method which subclasses must implement. This method allows
	187	* polymorphic parsing of strings into Formattable objects.
	188	* <P>
	189	* Before calling, set parse_pos.index to the offset you want to
	190	* start parsing at in the source. After calling, parse_pos.index
	191	* is the end of the text you parsed. If error occurs, index is
	192	* unchanged.
	193	* <P>
	194	* When parsing, leading whitespace is discarded (with successful
	195	* parse), while trailing whitespace is left as is.
	196	* <P>
	197	* Example:
	198	* <P>
	199	* Parsing "_12_xy" (where _ represents a space) for a number,
	200	* with index == 0 will result in the number 12, with
	201	* parse_pos.index updated to 3 (just before the second space).
	202	* Parsing a second time will result in a failing UErrorCode since
	203	* "xy" is not a number, and leave index at 3.
	204	* <P>
	205	* Subclasses will typically supply specific parse methods that
	206	* return different types of values. Since methods can't overload
	207	* on return types, these will typically be named "parse", while
	208	* this polymorphic method will always be called parseObject. Any
	209	* parse method that does not take a parse_pos should set status
	210	* to an error value when no text in the required format is at the
	211	* start position.
	212	*
	213	* @param source The string to be parsed into an object.
	214	* @param result Formattable to be set to the parse result.
	215	* If parse fails, return contents are undefined.
	216	* @param parse_pos The position to start parsing at. Upon return
	217	* this param is set to the position after the
	218	* last character successfully parsed. If the
	219	* source is not parsed successfully, this param
	220	* will remain unchanged.
	221	* @stable ICU 2.0
	222	*/
	223	virtual void parseObject(const UnicodeString& source,
	224	Formattable& result,
	225	ParsePosition& parse_pos) const = 0;
	226
	227	/**
	228	* Parses a string to produce an object. This is a convenience method
	229	* which calls the pure virtual parseObject() method, and returns a
	230	* failure UErrorCode if the ParsePosition indicates failure.
	231	*
	232	* @param source The string to be parsed into an object.
	233	* @param result Formattable to be set to the parse result.
	234	* If parse fails, return contents are undefined.
	235	* @param status Output param to be filled with success/failure
	236	* result code.
	237	* @stable ICU 2.0
	238	*/
	239	void parseObject(const UnicodeString& source,
	240	Formattable& result,
	241	UErrorCode& status) const;
	242
374ca955 A	243	/** Get the locale for this format object. You can choose between valid and actual locale.
	244	* @param type type of the locale we're looking for (valid or actual)
	245	* @param status error code for the operation
	246	* @return the locale
73c04bcf	247	* @stable ICU 2.8
374ca955 A	248	*/
	249	Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const;
	250
4388f060	251	#ifndef U_HIDE_INTERNAL_API
374ca955 A	252	/** Get the locale for this format object. You can choose between valid and actual locale.
	253	* @param type type of the locale we're looking for (valid or actual)
	254	* @param status error code for the operation
	255	* @return the locale
	256	* @internal
	257	*/
	258	const char* getLocaleID(ULocDataLocaleType type, UErrorCode &status) const;
4388f060	259	#endif /* U_HIDE_INTERNAL_API */
374ca955 A	260
374ca955 A	261	protected:
73c04bcf	262	/** @stable ICU 2.8 */
374ca955 A	263	void setLocaleIDs(const char* valid, const char* actual);
374ca955 A	264
b75a7d8f A	265	protected:
	266	/**
	267	* Default constructor for subclass use only. Does nothing.
	268	* @stable ICU 2.0
	269	*/
	270	Format();
	271
	272	/**
	273	* @stable ICU 2.0
	274	*/
	275	Format(const Format&); // Does nothing; for subclasses only
	276
	277	/**
	278	* @stable ICU 2.0
	279	*/
	280	Format& operator=(const Format&); // Does nothing; for subclasses
	281
	282
	283	/**
	284	* Simple function for initializing a UParseError from a UnicodeString.
	285	*
	286	* @param pattern The pattern to copy into the parseError
	287	* @param pos The position in pattern where the error occured
	288	* @param parseError The UParseError object to fill in
374ca955	289	* @stable ICU 2.4
b75a7d8f A	290	*/
	291	static void syntaxError(const UnicodeString& pattern,
	292	int32_t pos,
	293	UParseError& parseError);
374ca955 A	294
	295	private:
	296	char actualLocale[ULOC_FULLNAME_CAPACITY];
	297	char validLocale[ULOC_FULLNAME_CAPACITY];
b75a7d8f A	298	};
	299
	300	U_NAMESPACE_END
	301
	302	#endif /* #if !UCONFIG_NO_FORMATTING */
	303
	304	#endif // _FORMAT
	305	//eof