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