new appraoch

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

@@ -0,0 +1,42 @@
+<?php
+
+namespace Money\Exchange;
+
+use Money\Currency;
+use Money\CurrencyPair;
+use Money\Exception\UnresolvableCurrencyPairException;
+use Money\Exchange;
+
+/**
+ * Provides a way to get exchange rate from a static list (array).
+ *
+ * @author Frederik Bosch <f.bosch@genkgo.nl>
+ */
+final class FixedExchange implements Exchange
+{
+    /**
+     * @var array
+     */
+    private $list;
+
+    public function __construct(array $list)
+    {
+        $this->list = $list;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    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);
+    }
+}