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<?php
declare(strict_types=1);
namespace Brick\Money\Context;
use Brick\Money\Context;
use Brick\Money\Currency;
use Brick\Math\BigDecimal;
use Brick\Math\BigNumber;
/**
* Adjusts a number to the default scale for the currency, respecting a cash rounding.
*/
final class CashContext implements Context
{
/**
* The cash rounding step, in minor units.
*
* For example, step 5 on CHF would allow CHF 0.00, CHF 0.05, CHF 0.10, etc.
*
* @var int
*/
private $step;
/**
* @param int $step The cash rounding step, in minor units. Must be a multiple of 2 and/or 5.
*/
public function __construct(int $step)
{
$this->step = $step;
}
/**
* {@inheritdoc}
*/
public function applyTo(BigNumber $amount, Currency $currency, int $roundingMode) : BigDecimal
{
$scale = $currency->getDefaultFractionDigits();
if ($this->step === 1) {
return $amount->toScale($scale, $roundingMode);
}
return $amount
->toBigRational()
->dividedBy($this->step)
->toScale($scale, $roundingMode)
->multipliedBy($this->step);
}
/**
* {@inheritdoc}
*/
public function getStep() : int
{
return $this->step;
}
/**
* {@inheritdoc}
*/
public function isFixedScale() : bool
{
return true;
}
}