297 lines
12 KiB
C++
297 lines
12 KiB
C++
/*
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********************************************************************************
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* Copyright (C) 1997-2006, International Business Machines Corporation and others.
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* All Rights Reserved.
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********************************************************************************
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*
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* File FORMAT.H
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*
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* Modification History:
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*
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* Date Name Description
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* 02/19/97 aliu Converted from java.
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* 03/17/97 clhuang Updated per C++ implementation.
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* 03/27/97 helena Updated to pass the simple test after code review.
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********************************************************************************
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*/
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// *****************************************************************************
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// This file was generated from the java source file Format.java
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// *****************************************************************************
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#ifndef FORMAT_H
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#define FORMAT_H
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#include "unicode/utypes.h"
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/**
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* \file
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* \brief C++ API: Base class for all formats.
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*/
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/unistr.h"
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#include "unicode/fmtable.h"
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#include "unicode/fieldpos.h"
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#include "unicode/parsepos.h"
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#include "unicode/parseerr.h"
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#include "unicode/locid.h"
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U_NAMESPACE_BEGIN
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/**
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* Base class for all formats. This is an abstract base class which
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* specifies the protocol for classes which convert other objects or
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* values, such as numeric values and dates, and their string
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* representations. In some cases these representations may be
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* localized or contain localized characters or strings. For example,
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* a numeric formatter such as DecimalFormat may convert a numeric
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* value such as 12345 to the string "$12,345". It may also parse
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* the string back into a numeric value. A date and time formatter
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* like SimpleDateFormat may represent a specific date, encoded
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* numerically, as a string such as "Wednesday, February 26, 1997 AD".
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* <P>
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* Many of the concrete subclasses of Format employ the notion of
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* a pattern. A pattern is a string representation of the rules which
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* govern the interconversion between values and strings. For example,
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* a DecimalFormat object may be associated with the pattern
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* "$#,##0.00;($#,##0.00)", which is a common US English format for
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* currency values, yielding strings such as "$1,234.45" for 1234.45,
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* and "($987.65)" for 987.6543. The specific syntax of a pattern
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* is defined by each subclass.
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* <P>
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* Even though many subclasses use patterns, the notion of a pattern
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* is not inherent to Format classes in general, and is not part of
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* the explicit base class protocol.
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* <P>
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* Two complex formatting classes bear mentioning. These are
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* MessageFormat and ChoiceFormat. ChoiceFormat is a subclass of
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* NumberFormat which allows the user to format different number ranges
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* as strings. For instance, 0 may be represented as "no files", 1 as
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* "one file", and any number greater than 1 as "many files".
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* MessageFormat is a formatter which utilizes other Format objects to
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* format a string containing with multiple values. For instance,
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* A MessageFormat object might produce the string "There are no files
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* on the disk MyDisk on February 27, 1997." given the arguments 0,
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* "MyDisk", and the date value of 2/27/97. See the ChoiceFormat
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* and MessageFormat headers for further information.
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* <P>
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* If formatting is unsuccessful, a failing UErrorCode is returned when
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* the Format cannot format the type of object, otherwise if there is
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* something illformed about the the Unicode replacement character
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* 0xFFFD is returned.
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* <P>
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* If there is no match when parsing, a parse failure UErrorCode is
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* retured for methods which take no ParsePosition. For the method
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* that takes a ParsePosition, the index parameter is left unchanged.
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* <P>
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* <em>User subclasses are not supported.</em> While clients may write
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* subclasses, such code will not necessarily work and will not be
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* guaranteed to work stably from release to release.
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*/
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class U_I18N_API Format : public UObject {
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public:
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/** Destructor
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* @stable ICU 2.4
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*/
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virtual ~Format();
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/**
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* Return true if the given Format objects are semantically equal.
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* Objects of different subclasses are considered unequal.
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* @param other the object to be compared with.
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* @return Return true if the given Format objects are semantically equal.
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* Objects of different subclasses are considered unequal.
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* @stable ICU 2.0
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*/
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virtual UBool operator==(const Format& other) const = 0;
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/**
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* Return true if the given Format objects are not semantically
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* equal.
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* @param other the object to be compared with.
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* @return Return true if the given Format objects are not semantically.
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* @stable ICU 2.0
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*/
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UBool operator!=(const Format& other) const { return !operator==(other); }
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/**
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* Clone this object polymorphically. The caller is responsible
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* for deleting the result when done.
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* @return A copy of the object
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* @stable ICU 2.0
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*/
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virtual Format* clone() const = 0;
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/**
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* Formats an object to produce a string.
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*
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* @param obj The object to format.
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* @param appendTo Output parameter to receive result.
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* Result is appended to existing contents.
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* @param status Output parameter filled in with success or failure status.
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* @return Reference to 'appendTo' parameter.
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* @stable ICU 2.0
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*/
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UnicodeString& format(const Formattable& obj,
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UnicodeString& appendTo,
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UErrorCode& status) const;
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/**
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* Format an object to produce a string. This is a pure virtual method which
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* subclasses must implement. This method allows polymorphic formatting
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* of Formattable objects. If a subclass of Format receives a Formattable
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* object type it doesn't handle (e.g., if a numeric Formattable is passed
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* to a DateFormat object) then it returns a failing UErrorCode.
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*
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* @param obj The object to format.
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* @param appendTo Output parameter to receive result.
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* Result is appended to existing contents.
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* @param pos On input: an alignment field, if desired.
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* On output: the offsets of the alignment field.
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* @param status Output param filled with success/failure status.
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* @return Reference to 'appendTo' parameter.
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* @stable ICU 2.0
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*/
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virtual UnicodeString& format(const Formattable& obj,
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UnicodeString& appendTo,
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FieldPosition& pos,
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UErrorCode& status) const = 0;
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/**
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* Parse a string to produce an object. This is a pure virtual
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* method which subclasses must implement. This method allows
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* polymorphic parsing of strings into Formattable objects.
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* <P>
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* Before calling, set parse_pos.index to the offset you want to
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* start parsing at in the source. After calling, parse_pos.index
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* is the end of the text you parsed. If error occurs, index is
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* unchanged.
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* <P>
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* When parsing, leading whitespace is discarded (with successful
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* parse), while trailing whitespace is left as is.
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* <P>
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* Example:
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* <P>
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* Parsing "_12_xy" (where _ represents a space) for a number,
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* with index == 0 will result in the number 12, with
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* parse_pos.index updated to 3 (just before the second space).
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* Parsing a second time will result in a failing UErrorCode since
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* "xy" is not a number, and leave index at 3.
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* <P>
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* Subclasses will typically supply specific parse methods that
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* return different types of values. Since methods can't overload
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* on return types, these will typically be named "parse", while
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* this polymorphic method will always be called parseObject. Any
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* parse method that does not take a parse_pos should set status
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* to an error value when no text in the required format is at the
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* start position.
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*
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* @param source The string to be parsed into an object.
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* @param result Formattable to be set to the parse result.
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* If parse fails, return contents are undefined.
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* @param parse_pos The position to start parsing at. Upon return
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* this param is set to the position after the
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* last character successfully parsed. If the
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* source is not parsed successfully, this param
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* will remain unchanged.
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* @stable ICU 2.0
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*/
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virtual void parseObject(const UnicodeString& source,
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Formattable& result,
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ParsePosition& parse_pos) const = 0;
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/**
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* Parses a string to produce an object. This is a convenience method
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* which calls the pure virtual parseObject() method, and returns a
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* failure UErrorCode if the ParsePosition indicates failure.
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*
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* @param source The string to be parsed into an object.
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* @param result Formattable to be set to the parse result.
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* If parse fails, return contents are undefined.
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* @param status Output param to be filled with success/failure
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* result code.
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* @stable ICU 2.0
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*/
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void parseObject(const UnicodeString& source,
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Formattable& result,
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UErrorCode& status) const;
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/**
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* Returns a unique class ID POLYMORPHICALLY. Pure virtual method.
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* This method is to implement a simple version of RTTI, since not all
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* C++ compilers support genuine RTTI. Polymorphic operator==() and
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* clone() methods call this method.
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* Concrete subclasses of Format must implement getDynamicClassID()
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*
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* @return The class ID for this object. All objects of a
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* given class have the same class ID. Objects of
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* other classes have different class IDs.
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* @stable ICU 2.0
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*/
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virtual UClassID getDynamicClassID() const = 0;
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/** Get the locale for this format object. You can choose between valid and actual locale.
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* @param type type of the locale we're looking for (valid or actual)
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* @param status error code for the operation
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* @return the locale
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* @stable ICU 2.8
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*/
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Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const;
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/** Get the locale for this format object. You can choose between valid and actual locale.
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* @param type type of the locale we're looking for (valid or actual)
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* @param status error code for the operation
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* @return the locale
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* @internal
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*/
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const char* getLocaleID(ULocDataLocaleType type, UErrorCode &status) const;
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protected:
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/** @stable ICU 2.8 */
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void setLocaleIDs(const char* valid, const char* actual);
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protected:
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/**
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* Default constructor for subclass use only. Does nothing.
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* @stable ICU 2.0
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*/
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Format();
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/**
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* @stable ICU 2.0
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*/
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Format(const Format&); // Does nothing; for subclasses only
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/**
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* @stable ICU 2.0
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*/
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Format& operator=(const Format&); // Does nothing; for subclasses
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/**
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* Simple function for initializing a UParseError from a UnicodeString.
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*
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* @param pattern The pattern to copy into the parseError
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* @param pos The position in pattern where the error occured
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* @param parseError The UParseError object to fill in
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* @stable ICU 2.4
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*/
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static void syntaxError(const UnicodeString& pattern,
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int32_t pos,
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UParseError& parseError);
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private:
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char actualLocale[ULOC_FULLNAME_CAPACITY];
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char validLocale[ULOC_FULLNAME_CAPACITY];
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};
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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#endif // _FORMAT
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//eof
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