140 lines
3.8 KiB
C++
140 lines
3.8 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 2014-2015, International Business Machines
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* Corporation and others. All Rights Reserved.
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******************************************************************************
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* quantityformatter.h
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*/
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#ifndef __QUANTITY_FORMATTER_H__
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#define __QUANTITY_FORMATTER_H__
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#include "unicode/utypes.h"
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#include "unicode/uobject.h"
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#if !UCONFIG_NO_FORMATTING
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#include "standardplural.h"
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U_NAMESPACE_BEGIN
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class SimplePatternFormatter;
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class UnicodeString;
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class PluralRules;
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class NumberFormat;
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class Formattable;
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class FieldPosition;
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/**
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* A plural aware formatter that is good for expressing a single quantity and
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* a unit.
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* <p>
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* First use the add() methods to add a pattern for each plural variant.
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* There must be a pattern for the "other" variant.
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* Then use the format() method.
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* <p>
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* Concurrent calls only to const methods on a QuantityFormatter object are
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* safe, but concurrent const and non-const method calls on a QuantityFormatter
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* object are not safe and require synchronization.
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*
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*/
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class U_I18N_API QuantityFormatter : public UMemory {
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public:
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/**
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* Default constructor.
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*/
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QuantityFormatter();
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/**
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* Copy constructor.
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*/
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QuantityFormatter(const QuantityFormatter& other);
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/**
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* Assignment operator
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*/
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QuantityFormatter &operator=(const QuantityFormatter& other);
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/**
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* Destructor.
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*/
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~QuantityFormatter();
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/**
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* Removes all variants from this object including the "other" variant.
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*/
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void reset();
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/**
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* Adds a plural variant if there is none yet for the plural form.
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*
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* @param variant "zero", "one", "two", "few", "many", "other"
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* @param rawPattern the pattern for the variant e.g "{0} meters"
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* @param status any error returned here.
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* @return TRUE on success; FALSE if status was set to a non zero error.
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*/
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UBool addIfAbsent(const char *variant, const UnicodeString &rawPattern, UErrorCode &status);
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/**
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* returns TRUE if this object has at least the "other" variant.
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*/
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UBool isValid() const;
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/**
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* Gets the pattern formatter that would be used for a particular variant.
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* If isValid() returns TRUE, this method is guaranteed to return a
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* non-NULL value.
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*/
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const SimplePatternFormatter *getByVariant(const char *variant) const;
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/**
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* Formats a number with this object appending the result to appendTo.
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* At least the "other" variant must be added to this object for this
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* method to work.
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*
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* @param number the single number.
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* @param fmt formats the number
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* @param rules computes the plural variant to use.
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* @param appendTo result appended here.
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* @param status any error returned here.
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* @return appendTo
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*/
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UnicodeString &format(
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const Formattable &number,
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const NumberFormat &fmt,
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const PluralRules &rules,
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UnicodeString &appendTo,
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FieldPosition &pos,
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UErrorCode &status) const;
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/**
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* Selects the standard plural form for the number/formatter/rules.
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*/
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static StandardPlural::Form selectPlural(
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const Formattable &number,
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const NumberFormat &fmt,
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const PluralRules &rules,
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UnicodeString &formattedNumber,
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FieldPosition &pos,
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UErrorCode &status);
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/**
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* Formats the pattern with the value and adjusts the FieldPosition.
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*/
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static UnicodeString &format(
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const SimplePatternFormatter &pattern,
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const UnicodeString &value,
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UnicodeString &appendTo,
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FieldPosition &pos,
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UErrorCode &status);
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private:
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SimplePatternFormatter *formatters[StandardPlural::COUNT];
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};
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U_NAMESPACE_END
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#endif
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#endif
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