digitgroupingiterator.hxx

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#ifndef INCLUDED_UNOTOOLS_DIGITGROUPINGITERATOR_HXX
#define INCLUDED_UNOTOOLS_DIGITGROUPINGITERATOR_HXX
 
#include <com/sun/star/uno/Sequence.hxx>
#include <sal/log.hxx>
 
namespace utl {
 
class DigitGroupingIterator
{
    const css::uno::Sequence< sal_Int32 > maGroupings;
 
    sal_Int32   mnGroup;        // current active grouping
    sal_Int32   mnDigits;       // current active digits per group
    sal_Int32   mnNextPos;      // position (in digits) of next grouping
 
    void setInfinite()
    {
        mnGroup = maGroupings.getLength();
    }
 
    bool isInfinite() const
    {
        return mnGroup >= maGroupings.getLength();
    }
 
    sal_Int32 getGrouping() const
    {
        if (mnGroup < maGroupings.getLength())
        {
            sal_Int32 n = maGroupings[mnGroup];
            SAL_WARN_IF( n < 0, "unotools.i18n", "DigitGroupingIterator::getGrouping: negative grouping");
            if (n < 0)
                n = 0;      // sanitize ...
            return n;
        }
        return 0;
    }
 
    void setPos()
    {
        // someone might be playing jokes on us, so check for overflow
        if (mnNextPos <= SAL_MAX_INT32 - mnDigits)
            mnNextPos += mnDigits;
    }
 
    void setDigits()
    {
        sal_Int32 nPrev = mnDigits;
        mnDigits = getGrouping();
        if (!mnDigits)
        {
            mnDigits = nPrev;
            setInfinite();
        }
        setPos();
    }
 
    void initGrouping()
    {
        mnDigits = 3;       // just in case of constructed with empty grouping
        mnGroup = 0;
        mnNextPos = 0;
        setDigits();
    }
 
    DigitGroupingIterator( const DigitGroupingIterator & ) = delete;
    DigitGroupingIterator & operator=( const DigitGroupingIterator & ) = delete;
 
public:
 
    explicit DigitGroupingIterator( const css::uno::Sequence< sal_Int32 > & rGroupings )
        : maGroupings( rGroupings)
    {
        initGrouping();
    }
 
    DigitGroupingIterator & advance()
    {
        if (isInfinite())
            setPos();
        else
        {
            ++mnGroup;
            setDigits();
        }
        return *this;
    }
 
    sal_Int32 get() const
    {
        return mnDigits;
    }
 
    sal_Int32 getPos() const
    {
        return mnNextPos;
    }
 
    void reset()
    {
        initGrouping();
    }
 
    static css::uno::Sequence< sal_Bool > createForwardSequence(
            sal_Int32 nIntegerDigits,
            const css::uno::Sequence< sal_Int32 > & rGroupings )
    {
        if (nIntegerDigits <= 0)
            return css::uno::Sequence< sal_Bool >();
        DigitGroupingIterator aIterator( rGroupings);
        css::uno::Sequence< sal_Bool > aSeq( nIntegerDigits);
        sal_Bool* pArr = aSeq.getArray();
        for (sal_Int32 j = 0; --nIntegerDigits >= 0; ++j)
        {
            if (j == aIterator.getPos())
            {
                pArr[nIntegerDigits] = true;
                aIterator.advance();
            }
            else
                pArr[nIntegerDigits] = false;
        }
        return aSeq;
    }
};
 
} // namespace utl
 
#endif // INCLUDED_UNOTOOLS_DIGITGROUPINGITERATOR_HXX
 
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