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| <?php | |
| namespace Money\Exchange; | |
| use Money\Currency; | |
| use Money\CurrencyPair; | |
| use Money\Exception\UnresolvableCurrencyPairException; | |
| use Money\Exchange; | |
| /** | |
| * Tries the reverse of the currency pair if one is not available. | |
| * | |
| * Note: adding nested ReversedCurrenciesExchange could cause a huge performance hit. | |
| * | |
| * @author Márk Sági-Kazár <mark.sagikazar@gmail.com> | |
| */ | |
| final class ReversedCurrenciesExchange implements Exchange | |
| { | |
| /** | |
| * @var Exchange | |
| */ | |
| private $exchange; | |
| /** | |
| * @param Exchange $exchange | |
| */ | |
| public function __construct(Exchange $exchange) | |
| { | |
| $this->exchange = $exchange; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function quote(Currency $baseCurrency, Currency $counterCurrency) | |
| { | |
| try { | |
| return $this->exchange->quote($baseCurrency, $counterCurrency); | |
| } catch (UnresolvableCurrencyPairException $exception) { | |
| try { | |
| $currencyPair = $this->exchange->quote($counterCurrency, $baseCurrency); | |
| return new CurrencyPair($baseCurrency, $counterCurrency, 1 / $currencyPair->getConversionRatio()); | |
| } catch (UnresolvableCurrencyPairException $inversedException) { | |
| throw $exception; | |
| } | |
| } | |
| } | |
| } |