Viewing file:  ReversedCurrenciesExchange.php (1.26 KB) -rw-r--r--
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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;
}
}
}
}
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