new appraoch

pancake/system/vendor/moneyphp/money/src/Exchange/ExchangerExchange.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Money\Exchange;
+
+use Exchanger\Contract\ExchangeRateProvider;
+use Exchanger\CurrencyPair as ExchangerCurrencyPair;
+use Exchanger\Exception\Exception as ExchangerException;
+use Exchanger\ExchangeRateQuery;
+use Money\Currency;
+use Money\CurrencyPair;
+use Money\Exception\UnresolvableCurrencyPairException;
+use Money\Exchange;
+
+/**
+ * Provides a way to get exchange rate from a third-party source and return a currency pair.
+ *
+ * @author Maksim (Ellrion) Platonov <ellrion11@gmail.com>
+ */
+final class ExchangerExchange implements Exchange
+{
+    /**
+     * @var ExchangeRateProvider
+     */
+    private $exchanger;
+
+    public function __construct(ExchangeRateProvider $exchanger)
+    {
+        $this->exchanger = $exchanger;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function quote(Currency $baseCurrency, Currency $counterCurrency)
+    {
+        try {
+            $query = new ExchangeRateQuery(
+                new ExchangerCurrencyPair($baseCurrency->getCode(), $counterCurrency->getCode())
+            );
+            $rate = $this->exchanger->getExchangeRate($query);
+        } catch (ExchangerException $e) {
+            throw UnresolvableCurrencyPairException::createFromCurrencies($baseCurrency, $counterCurrency);
+        }
+
+        return new CurrencyPair($baseCurrency, $counterCurrency, $rate->getValue());
+    }
+}