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<?php
declare(strict_types=1);
namespace Brick\Money;
use Brick\Math\BigDecimal;
use Brick\Math\BigNumber;
use Brick\Math\Exception\RoundingNecessaryException;
use Brick\Math\RoundingMode;
/**
* Adjusts a rational number to a decimal amount.
*/
interface Context
{
/**
* Applies this context to a rational amount, and returns a decimal number.
*
* The given rounding mode MUST be respected; no default rounding mode must be applied.
* In case the rounding mode is irrelevant, for example in AutoContext, this method MUST throw an exception if a
* rounding mode other than RoundingMode::UNNECESSARY is used.
*
* @psalm-param RoundingMode::* $roundingMode
*
* @param BigNumber $amount The amount.
* @param Currency $currency The target currency.
* @param int $roundingMode The rounding mode.
*
* @return BigDecimal
*
* @throws RoundingNecessaryException If the result cannot be represented at the required scale without rounding.
*/
public function applyTo(BigNumber $amount, Currency $currency, int $roundingMode) : BigDecimal;
/**
* Returns the step used by this context.
*
* If no cash rounding is involved, this must return 1.
* This value is used by money allocation methods that do not go through the applyTo() method.
*
* @return int
*/
public function getStep() : int;
/**
* Returns whether this context uses a fixed scale and step.
*
* When the scale and step are fixed, it is considered safe to add or subtract monies amounts directly —as long as
* they are in the same context— without going through the applyTo() method, allowing for an optimization.
*
* @return bool
*/
public function isFixedScale() : bool;
}