FixedExchange.php

<?php
 
namespace Money\Exchange;
 
use Money\Currency;
use Money\CurrencyPair;
use Money\Exception\UnresolvableCurrencyPairException;
use Money\Exchange;
 
final class FixedExchange implements Exchange
{
    private $list;
 
    public function __construct(array $list)
    {
        $this->list = $list;
    }
 
    public function quote(Currency $baseCurrency, Currency $counterCurrency)
    {
        if (isset($this->list[$baseCurrency->getCode()][$counterCurrency->getCode()])) {
            return new CurrencyPair(
                $baseCurrency,
                $counterCurrency,
                $this->list[$baseCurrency->getCode()][$counterCurrency->getCode()]
            );
        }
 
        throw UnresolvableCurrencyPairException::createFromCurrencies($baseCurrency, $counterCurrency);
    }
}