ReversedCurrenciesExchange.php

<?php
 
namespace Money\Exchange;
 
use Money\Currency;
use Money\CurrencyPair;
use Money\Exception\UnresolvableCurrencyPairException;
use Money\Exchange;
 
final class ReversedCurrenciesExchange implements Exchange
{
    private $exchange;
 
    public function __construct(Exchange $exchange)
    {
        $this->exchange = $exchange;
    }
 
    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;
            }
        }
    }
}