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<?php
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;
/**
* Provides a way to get exchange rate from a third-party source and return a currency pair.
*
* @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
*/
final class SwapExchange implements Exchange
{
/**
* @var Swap
*/
private $swap;
/**
* @param Swap $swap
*/
public function __construct(Swap $swap)
{
$this->swap = $swap;
}
/**
* {@inheritdoc}
*/
public function quote(Currency $baseCurrency, Currency $counterCurrency)
{
try {
$rate = $this->swap->latest($baseCurrency->getCode().'/'.$counterCurrency->getCode());
} catch (ExchangerException $e) {
throw UnresolvableCurrencyPairException::createFromCurrencies($baseCurrency, $counterCurrency);
}
return new CurrencyPair($baseCurrency, $counterCurrency, $rate->getValue());
}
}