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<?php declare(strict_types=1); namespace Money\Exchange; use Exchanger\Exception\Exception as ExchangerException; use Money\Currency; use Money\CurrencyPair; use Money\Exception\UnresolvableCurrencyPairException; use Money\Exchange; use Swap\Swap; use function assert; use function is_numeric; use function sprintf; /** * Provides a way to get exchange rate from a third-party source and return a currency pair. */ final class SwapExchange implements Exchange { private Swap $swap; public function __construct(Swap $swap) { $this->swap = $swap; } public function quote(Currency $baseCurrency, Currency $counterCurrency): CurrencyPair { try { $rate = $this->swap->latest($baseCurrency->getCode() . '/' . $counterCurrency->getCode()); } catch (ExchangerException) { throw UnresolvableCurrencyPairException::createFromCurrencies($baseCurrency, $counterCurrency); } $rateValue = sprintf('%.14F', $rate->getValue()); assert(is_numeric($rateValue)); return new CurrencyPair($baseCurrency, $counterCurrency, $rateValue); } }
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