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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
********************************************************************************
* 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"
#if U_SHOW_CPLUSPLUS_API
/**
* \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 /* U_SHOW_CPLUSPLUS_API */
#endif // _FORMAT
//eof
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