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649 lines
24 KiB
C++
649 lines
24 KiB
C++
/*
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********************************************************************************
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* *
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* COPYRIGHT: *
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* (C) Copyright Taligent, Inc., 1997 *
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* (C) Copyright International Business Machines Corporation, 1997 *
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* Licensed Material - Program-Property of IBM - All Rights Reserved. *
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* US Government Users Restricted Rights - Use, duplication, or disclosure *
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* restricted by GSA ADP Schedule Contract with IBM Corp. *
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* *
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********************************************************************************
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*
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* File DECIMFMT.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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* 03/20/97 clhuang Updated per C++ implementation.
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* 04/03/97 aliu Rewrote parsing and formatting completely, and
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* cleaned up and debugged. Actually works now.
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* 04/17/97 aliu Changed DigitCount to int per code review.
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* 07/10/97 helena Made ParsePosition a class and get rid of the function
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* hiding problems.
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* 09/09/97 aliu Ported over support for exponential formats.
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********************************************************************************
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*/
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#ifndef _DECIMFMT
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#define _DECIMFMT
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#include "ptypes.h"
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#include "numfmt.h"
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#include "locid.h"
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class DecimalFormatSymbols;
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class DigitList;
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/**
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* Concrete class for formatting decimal numbers, allowing a variety
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* of parameters, and localization to Western, Arabic, or Indic numbers.
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* <P>
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* Normally, you get the proper NumberFormat for a specific locale
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* (including the default locale) using the NumberFormat factory methods,
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* rather than constructing a DecimalNumberFormat directly.
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* <P>
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* Either the prefixes or the suffixes must be different for the parse
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* to distinguish positive from negative. Parsing will be unreliable
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* if the digits, thousands or decimal separators are the same, or if
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* any of them occur in the prefixes or suffixes.
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* <P>
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* [Special cases:]
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* <P>
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* NaN is formatted as a single character, typically \\uFFFD.
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* <P>
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* +/-Infinity is formatted as a single character, typically \\u221E,
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* plus the positive and negative pre/suffixes.
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* <P>
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* Note: this class is designed for common users; for very large or small
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* numbers, use a format that can express exponential values.
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* <P>
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* [Example:]
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* <pre>
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* . // normally we would have a GUI with a menu for this
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* . long count;
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* . Locale* locales = NumberFormat::getAvailableLocales(count);
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*
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* . double myNumber = -1234.56;
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* . NumberFormat* form;
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*
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* . // just for fun, we print out a number with the locale number, currency
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* . // and percent format for each locale we can.
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* . for (int j = 0; j < 3; ++j) {
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* . cout << "FORMAT" << endl;
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* . for (int i = 0; i < count; ++i) {
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* . if (locales[i]->getCountry().length() == 0) {
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* . // skip language-only
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* . continue;
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* . }
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* . cout << locales[i]->getDisplayName();
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* . switch (j) {
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* . default:
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* . form = NumberFormat::getInstance(*locales[i]); break;
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* . case 1:
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* . form = NumberFormat::getDefaultCurrency(*locales[i]); break;
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* . case 0:
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* . form = NumberFormat::getDefaultPercent(*locales[i]); break;
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* . }
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* . UnicodeString str;
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* . ErrorCode status;
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* . UnicodeString pattern;
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* . if (form->getDynamicClassID() == DecimalFormat::getStaticClassID())
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* . ((DecimalFormat*)form)->toPattern(pattern);
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* . cout << ": " << pattern
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* . << " -> " << form->format(myNumber, str);
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* . cout << " -> " << form->parse(form->format(myNumber, str), status)
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* . << endl;
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* . }
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* . }
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* </pre>
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* [The following shows the structure of the pattern.]
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* <pre>
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* . pattern := subpattern{;subpattern}
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* . subpattern := {prefix}integer{.fraction}{suffix}
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* .
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* . prefix := '\\u0000'..'\\uFFFD' - specialCharacters
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* . suffix := '\\u0000'..'\\uFFFD' - specialCharacters
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* . integer := '#'* '0'* '0'
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* . fraction := '0'* '#'*
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*
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* Notation:
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* . X* 0 or more instances of X
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* . (X | Y) either X or Y.
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* . X..Y any character from X up to Y, inclusive.
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* . S - T characters in S, except those in T
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* </pre>
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* The first subpattern is for positive numbers. The second (optional)
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* subpattern is used for negative numbers. (In both cases, ',' can
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* occur inside the integer portion--it is just too messy to indicate
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* in BNF.) For the second subpattern, only the PREFIX and SUFFIX are
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* noted; other attributes are taken only from the first subpattern.
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* <P>
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* Here are the special characters used in the parts of the
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* subpattern, with notes on their usage.
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* <pre>
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* . Symbol Meaning
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* . 0 a digit, showing up a zero if it is zero
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* . # a digit, supressed if zero
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* . . placeholder for decimal separator
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* . , placeholder for grouping separator
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* . ; separates postive from negative formats
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* . - default negative prefix
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* . % divide by 100 and show as percentage
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* . X any other characters can be used in the prefix or suffix
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* . ' used to quote special characters in a prefix or suffix
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* </pre>
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* [Notes]
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* <P>
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* If there is no explicit negative subpattern, - is prefixed to the
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* positive form. That is, "0.00" alone is equivalent to "0.00;-0.00".
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* <P>
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* Illegal formats, such as "#.#.#" in the same format, will cause a
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* failing ErrorCode to be returned.
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* <P>
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* The grouping separator is commonly used for thousands, but in some
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* countries for ten-thousands. The interval is a constant number of
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* digits between the grouping characters, such as 100,000,000 or 1,0000,0000.
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* If you supply a pattern with multiple grouping characters, the interval
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* between the last one and the end of the integer is the one that is
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* used. So "#,##,###,####" == "######,####" == "##,####,####".
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* <P>
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* This class only handles localized digits where the 10 digits are
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* contiguous in Unicode, from 0 to 9. Other digits sets (such as
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* superscripts) would need a different subclass.
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*/
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#ifdef NLS_MAC
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#pragma export on
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#endif
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class T_FORMAT_API DecimalFormat: public NumberFormat {
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public:
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/**
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* Create a DecimalFormat using the default pattern and symbols
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* for the default locale. This is a convenient way to obtain a
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* DecimalFormat when internationalization is not the main concern.
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* <P>
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* To obtain standard formats for a given locale, use the factory methods
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* on NumberFormat such as getNumberInstance. These factories will
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* return the most appropriate sub-class of NumberFormat for a given
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* locale.
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* @param status Output param set to success/failure code. If the
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* pattern is invalid this will be set to a failure code.
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*/
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DecimalFormat(ErrorCode& status);
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/**
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* Create a DecimalFormat from the given pattern and the symbols
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* for the default locale. This is a convenient way to obtain a
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* DecimalFormat when internationalization is not the main concern.
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* <P>
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* To obtain standard formats for a given locale, use the factory methods
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* on NumberFormat such as getNumberInstance. These factories will
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* return the most appropriate sub-class of NumberFormat for a given
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* locale.
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* @param pattern A non-localized pattern string.
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* @param status Output param set to success/failure code. If the
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* pattern is invalid this will be set to a failure code.
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*/
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DecimalFormat(const UnicodeString& pattern,
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ErrorCode& status);
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/**
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* Create a DecimalFormat from the given pattern and symbols.
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* Use this constructor when you need to completely customize the
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* behavior of the format.
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* <P>
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* To obtain standard formats for a given
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* locale, use the factory methods on NumberFormat such as
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* getInstance or getCurrencyInstance. If you need only minor adjustments
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* to a standard format, you can modify the format returned by
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* a NumberFormat factory method.
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*
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* @param pattern a non-localized pattern string
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* @param symbolsToAdopt the set of symbols to be used. The caller should not
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* delete this object after making this call.
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* @param status Output param set to success/failure code. If the
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* pattern is invalid this will be set to a failure code.
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*/
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DecimalFormat( const UnicodeString& pattern,
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DecimalFormatSymbols* symbolsToAdopt,
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ErrorCode& status);
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/**
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* Create a DecimalFormat from the given pattern and symbols.
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* Use this constructor when you need to completely customize the
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* behavior of the format.
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* <P>
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* To obtain standard formats for a given
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* locale, use the factory methods on NumberFormat such as
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* getInstance or getCurrencyInstance. If you need only minor adjustments
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* to a standard format, you can modify the format returned by
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* a NumberFormat factory method.
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*
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* @param pattern a non-localized pattern string
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* @param symbols the set of symbols to be used
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* @param status Output param set to success/failure code. If the
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* pattern is invalid this will be set to a failure code.
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*/
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DecimalFormat( const UnicodeString& pattern,
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const DecimalFormatSymbols& symbols,
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ErrorCode& status);
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/**
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* Copy constructor.
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*/
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DecimalFormat(const DecimalFormat& source);
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/**
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* Assignment operator.
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*/
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DecimalFormat& operator=(const DecimalFormat& rhs);
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/**
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* Destructor.
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*/
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virtual ~DecimalFormat();
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/**
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* Clone this Format object polymorphically. The caller owns the
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* result and should delete it when done.
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*/
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virtual Format* clone() const;
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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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*/
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virtual t_bool operator==(const Format& other) const;
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/**
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* Format a double or long number using base-10 representation.
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*
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* @param number The value to be formatted.
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* @param toAppendTo The string to append the formatted string to.
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* This is an output parameter.
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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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* @return A reference to 'toAppendTo'.
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*/
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virtual UnicodeString& format(double number,
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UnicodeString& toAppendTo,
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FieldPosition& pos) const;
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virtual UnicodeString& format(long number,
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UnicodeString& toAppendTo,
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FieldPosition& pos) const;
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virtual UnicodeString& format(const Formattable& obj,
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UnicodeString& toAppendTo,
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FieldPosition& pos,
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ErrorCode& status) const;
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/**
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* Parse the given string using this object's choices. The method
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* does string comparisons to try to find an optimal match.
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* If no object can be parsed, index is unchanged, and NULL is
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* returned.
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*
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* @param text The text to be parsed.
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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 parsePosition The position to start parsing at on input.
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* On output, moved to after the last successfully
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* parse character. On parse failure, does not change.
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*/
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virtual void parse(const UnicodeString& text,
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Formattable& result,
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ParsePosition& parsePosition) const;
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// Declare here again to get rid of function hiding problems.
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virtual void parse(const UnicodeString& text,
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Formattable& result,
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ErrorCode& error) const;
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/**
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* Returns the decimal format symbols, which is generally not changed
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* by the programmer or user.
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* @return desired DecimalFormatSymbols
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* @see DecimalFormatSymbols
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*/
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virtual const DecimalFormatSymbols* getDecimalFormatSymbols() const;
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/**
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* Sets the decimal format symbols, which is generally not changed
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* by the programmer or user.
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* @param symbolsToAdopt DecimalFormatSymbols to be adopted.
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*/
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virtual void adoptDecimalFormatSymbols(DecimalFormatSymbols* symbolsToAdopt);
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/**
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* Sets the decimal format symbols, which is generally not changed
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* by the programmer or user.
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* @param symbols DecimalFormatSymbols.
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*/
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virtual void setDecimalFormatSymbols(const DecimalFormatSymbols& symbols);
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/**
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* Get the positive prefix.
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*
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* Examples: +123, $123, sFr123
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*/
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UnicodeString& getPositivePrefix(UnicodeString& result) const;
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/**
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* Set the positive prefix.
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*
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* Examples: +123, $123, sFr123
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*/
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virtual void setPositivePrefix(const UnicodeString& newValue);
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/**
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* Get the negative prefix.
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*
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* Examples: -123, ($123) (with negative suffix), sFr-123
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*/
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UnicodeString& getNegativePrefix(UnicodeString& result) const;
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/**
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* Set the negative prefix.
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*
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* Examples: -123, ($123) (with negative suffix), sFr-123
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*/
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virtual void setNegativePrefix(const UnicodeString& newValue);
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/**
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* Get the positive suffix.
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*
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* Example: 123%
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*/
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UnicodeString& getPositiveSuffix(UnicodeString& result) const;
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/**
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* Set the positive suffix.
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*
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* Example: 123%
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*/
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virtual void setPositiveSuffix(const UnicodeString& newValue);
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/**
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* Get the negative suffix.
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*
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* Examples: -123%, ($123) (with positive suffixes)
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*/
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UnicodeString& getNegativeSuffix(UnicodeString& result) const;
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/**
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* Set the positive suffix.
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*
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* Examples: 123%
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*/
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virtual void setNegativeSuffix(const UnicodeString& newValue);
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/**
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* Get the multiplier for use in percent, permill, etc.
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* For a percentage, set the suffixes to have "%" and the multiplier to be 100.
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* (For Arabic, use arabic percent symbol).
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* For a permill, set the suffixes to have "\u2031" and the multiplier to be 1000.
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*
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* Examples: with 100, 1.23 -> "123", and "123" -> 1.23
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*/
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t_int32 getMultiplier() const;
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/**
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* Set the multiplier for use in percent, permill, etc.
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* For a percentage, set the suffixes to have "%" and the multiplier to be 100.
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* (For Arabic, use arabic percent symbol).
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* For a permill, set the suffixes to have "\u2031" and the multiplier to be 1000.
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*
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* Examples: with 100, 1.23 -> "123", and "123" -> 1.23
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*/
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virtual void setMultiplier(t_int32 newValue);
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/**
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* Return the grouping size. Grouping size is the number of digits between
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* grouping separators in the integer portion of a number. For example,
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* in the number "123,456.78", the grouping size is 3.
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* @see setGroupingSize
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* @see NumberFormat::isGroupingUsed
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* @see DecimalFormatSymbols::getGroupingSeparator
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*/
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int getGroupingSize() const;
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/**
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* Set the grouping size. Grouping size is the number of digits between
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* grouping separators in the integer portion of a number. For example,
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* in the number "123,456.78", the grouping size is 3.
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* @see getGroupingSize
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* @see NumberFormat::setGroupingUsed
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* @see DecimalFormatSymbols::setGroupingSeparator
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*/
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virtual void setGroupingSize(int newValue);
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/**
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* Allows you to get the behavior of the decimal separator with integers.
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* (The decimal separator will always appear with decimals.)
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*
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* Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
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*/
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t_bool isDecimalSeparatorAlwaysShown() const;
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/**
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* Allows you to set the behavior of the decimal separator with integers.
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* (The decimal separator will always appear with decimals.)
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*
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* Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
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*/
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virtual void setDecimalSeparatorAlwaysShown(t_bool newValue);
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/**
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* Synthesizes a pattern string that represents the current state
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* of this Format object.
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* @see applyPattern
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*/
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virtual UnicodeString& toPattern(UnicodeString& result) const;
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/**
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* Synthesizes a localized pattern string that represents the current
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* state of this Format object.
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*
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* @see applyPattern
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*/
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virtual UnicodeString& toLocalizedPattern(UnicodeString& result) const;
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/**
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* Apply the given pattern to this Format object. A pattern is a
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* short-hand specification for the various formatting properties.
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* These properties can also be changed individually through the
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* various setter methods.
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* <P>
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* There is no limit to integer digits are set
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* by this routine, since that is the typical end-user desire;
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* use setMaximumInteger if you want to set a real value.
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* For negative numbers, use a second pattern, separated by a semicolon
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* <pre>
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* . Example "#,#00.0#" -> 1,234.56
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* </pre>
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* This means a minimum of 2 integer digits, 1 fraction digit, and
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* a maximum of 2 fraction digits.
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* <pre>
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* . Example: "#,#00.0#;(#,#00.0#)" for negatives in parantheses.
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* </pre>
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* In negative patterns, the minimum and maximum counts are ignored;
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* these are presumed to be set in the positive pattern.
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*
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* @param pattern The pattern to be applied.
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* @param status Output param set to success/failure code on
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* exit. If the pattern is invalid, this will be
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* set to a failure result.
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*/
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virtual void applyPattern(const UnicodeString& pattern,
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ErrorCode& status);
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/**
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* Apply the given pattern to this Format object. The pattern
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* is assumed to be in a localized notation. A pattern is a
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* short-hand specification for the various formatting properties.
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* These properties can also be changed individually through the
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* various setter methods.
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* <P>
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* There is no limit to integer digits are set
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* by this routine, since that is the typical end-user desire;
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* use setMaximumInteger if you want to set a real value.
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* For negative numbers, use a second pattern, separated by a semicolon
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* <pre>
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* . Example "#,#00.0#" -> 1,234.56
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* </pre>
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* This means a minimum of 2 integer digits, 1 fraction digit, and
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* a maximum of 2 fraction digits.
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*
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* Example: "#,#00.0#;(#,#00.0#)" for negatives in parantheses.
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*
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* In negative patterns, the minimum and maximum counts are ignored;
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* these are presumed to be set in the positive pattern.
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*
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* @param pattern The localized pattern to be applied.
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* @param status Output param set to success/failure code on
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* exit. If the pattern is invalid, this will be
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* set to a failure result.
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|
*/
|
|
virtual void applyLocalizedPattern(const UnicodeString& pattern,
|
|
ErrorCode& status);
|
|
|
|
/**
|
|
* The resource tags we use to retrieve decimal format data from
|
|
* locale resource bundles.
|
|
*/
|
|
static const UnicodeString kNumberPatterns;
|
|
|
|
public:
|
|
|
|
/**
|
|
* Return the class ID for this class. This is useful only for
|
|
* comparing to a return value from getDynamicClassID(). For example:
|
|
* <pre>
|
|
* . Base* polymorphic_pointer = createPolymorphicObject();
|
|
* . if (polymorphic_pointer->getDynamicClassID() ==
|
|
* . Derived::getStaticClassID()) ...
|
|
* </pre>
|
|
* @return The class ID for all objects of this class.
|
|
*/
|
|
static ClassID getStaticClassID() { return (ClassID)&fgClassID; }
|
|
|
|
/**
|
|
* Returns a unique class ID POLYMORPHICALLY. Pure virtual override.
|
|
* This method is to implement a simple version of RTTI, since not all
|
|
* C++ compilers support genuine RTTI. Polymorphic operator==() and
|
|
* clone() methods call this method.
|
|
*
|
|
* @return The class ID for this object. All objects of a
|
|
* given class have the same class ID. Objects of
|
|
* other classes have different class IDs.
|
|
*/
|
|
virtual ClassID getDynamicClassID() const { return getStaticClassID(); }
|
|
|
|
private:
|
|
static char fgClassID;
|
|
|
|
/**
|
|
* Do real work of constructing a new DecimalFormat.
|
|
*/
|
|
void construct(ErrorCode& status,
|
|
const UnicodeString* pattern = 0,
|
|
DecimalFormatSymbols* symbolsToAdopt = 0,
|
|
const Locale& locale = Locale::getDefault());
|
|
|
|
/**
|
|
* Does the real work of generating a pattern.
|
|
*/
|
|
UnicodeString& toPattern(UnicodeString& result, t_bool localized) const;
|
|
|
|
/**
|
|
* Does the real work of applying a pattern.
|
|
* @param pattern The pattern to be applied.
|
|
* @param localized If true, the pattern is localized; else false.
|
|
* @param status Output param set to success/failure code on
|
|
* exit. If the pattern is invalid, this will be
|
|
* set to a failure result.
|
|
*/
|
|
void applyPattern(const UnicodeString& pattern,
|
|
t_bool localized,
|
|
ErrorCode& status);
|
|
|
|
/**
|
|
* Do the work of formatting a number, either a double or a long.
|
|
*/
|
|
UnicodeString& subformat(UnicodeString& result,
|
|
FieldPosition& fieldPosition,
|
|
t_bool isNegative,
|
|
t_bool isInteger) const;
|
|
|
|
static const int STATUS_INFINITE;
|
|
static const int STATUS_POSITIVE;
|
|
static const int STATUS_LENGTH;
|
|
|
|
/**
|
|
* Parse the given text into a number. The text is parsed beginning at
|
|
* parsePosition, until an unparseable character is seen.
|
|
* @param text The string to parse.
|
|
* @param parsePosition The position at which to being parsing. Upon
|
|
* return, the first unparseable character.
|
|
* @param digits The DigitList to set to the parsed value.
|
|
* @param isExponent If true, parse an exponent. This means no
|
|
* infinite values and integer only.
|
|
* @param status Upon return contains boolean status flags indicating
|
|
* whether the value was infinite and whether it was positive.
|
|
*/
|
|
t_bool subparse(const UnicodeString& text, ParsePosition& parsePosition,
|
|
DigitList& digits, t_bool isExponent,
|
|
t_bool* status) const;
|
|
|
|
/**
|
|
* Constants.
|
|
*/
|
|
static const t_int8 kMaxDigit; // The largest digit, in this case 9
|
|
|
|
/*transient*/ DigitList* digitList;
|
|
|
|
UnicodeString fPositivePrefix;
|
|
UnicodeString fPositiveSuffix;
|
|
UnicodeString fNegativePrefix;
|
|
UnicodeString fNegativeSuffix;
|
|
t_int32 fMultiplier;
|
|
int fGroupingSize;
|
|
t_bool fDecimalSeparatorAlwaysShown;
|
|
/*transient*/ t_bool isCurrencyFormat;
|
|
DecimalFormatSymbols* fSymbols;
|
|
|
|
t_bool useExponentialNotation;
|
|
t_int8 minExponentDigits;
|
|
|
|
// Constants for characters used in programmatic (unlocalized) patterns.
|
|
static const UniChar PATTERN_ZERO_DIGIT;
|
|
static const UniChar PATTERN_GROUPING_SEPARATOR;
|
|
static const UniChar PATTERN_DECIMAL_SEPARATOR;
|
|
static const UniChar PATTERN_PER_MILLE;
|
|
static const UniChar PATTERN_PERCENT;
|
|
static const UniChar PATTERN_DIGIT;
|
|
static const UniChar PATTERN_SEPARATOR;
|
|
static const UniChar PATTERN_EXPONENT;
|
|
|
|
/**
|
|
* The CURRENCY_SIGN is the standard Unicode symbol for currency. It
|
|
* is used in patterns and substitued with either the currency symbol,
|
|
* or if it is doubled, with the international currency symbol. If the
|
|
* CURRENCY_SIGN is seen in a pattern, then the decimal separator is
|
|
* replaced with the monetary decimal separator.
|
|
*/
|
|
static const UniChar CURRENCY_SIGN;
|
|
|
|
static const UniChar QUOTE;
|
|
|
|
};
|
|
|
|
|
|
#ifdef NLS_MAC
|
|
#pragma export off
|
|
#endif
|
|
|
|
#endif // _DECIMFMT
|
|
//eof
|