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<?php |
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namespace MoneyMan; |
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use MoneyMan\Currency; |
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use MoneyMan\Money; |
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use Swap\Swap; |
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/** |
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* Exchange Class |
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* |
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* Defines how an exchange should be performed. A subclass is needed to derive |
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* the exchange rate used for |
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* |
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* @category Exchange |
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* @package Exchange |
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* @author Graham A. Sutton <[email protected]> |
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* @license MIT <http://mit.org> |
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* @link http://mit.org |
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*/ |
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class Exchange |
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{ |
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/** |
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* The exchange rate service. |
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* @var \Swap\Swap |
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*/ |
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private $service; |
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/** |
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* Constructor |
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* |
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* Accepts the name of an exchange rates service from Swap. Default is set to |
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* use Fixer. |
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* |
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* @param \Swap\Swap $service The service to query exchange rates from. |
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*/ |
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public function __construct($service) |
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{ |
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$this->service = $service; |
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} |
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/** |
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* Add two \MoneyMan\Money objects together. This will return a new \MoneyMan\Money |
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* object. |
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* |
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* IMPORTANT! If the currencies are different, the second parameter will be converted |
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* to the first parameter's currency and then added together. |
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* |
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* @param \MoneyMan\Money $money1 The first money object. |
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* @param \MoneyMan\Money $money2 The second money object. |
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* |
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* @return \MoneyMan\Money |
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*/ |
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public function add(Money $money1, Money $money2) |
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{ |
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// Convert the second money object to the first money object's currency |
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$converted_money = $this->exchange($money2, $money1->getCurrency()); |
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// Return the new \MoneyMan\Money in the first parameter's currency |
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return $money1->add($converted_money); |
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} |
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/** |
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* Subtract one \MoneyMan\Money object from another. This will return a brand new |
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* \MoneyMan\Money object. |
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* |
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* IMPORTANT! If the currencies are different, the second parameter will be converted |
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* to the first parameter's currency. Afterwards, the second parameter's exchanged |
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* amount will be deducted from the first parameter's amount and returned in a |
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* new \MoneyMan\Money object. |
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* |
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* @param \MoneyMan\Money $money1 The first money object |
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* @param \MoneyMan\Money $money2 The second money object |
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* |
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* @return \MoneyMan\Money |
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*/ |
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public function subtract(Money $money1, Money $money2) |
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{ |
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// Convert the second money object to the first money object's currency |
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$converted_money = $this->exchange($money2, $money1->getCurrency()); |
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// Return the new \MoneyMan\Money in the first parameter's currency |
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return $money1->subtract($converted_money); |
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} |
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/** |
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* Exchanges one \MoneyMan\Money object into the desired currency. |
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* |
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* This should return a brand new \MoneyMan\Money object. |
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* |
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* @param \MoneyMan\Money $base The money we are exchanging. |
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* @param \MoneyMan\Currency $quote The currency we are exchanging to. |
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* |
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* @return \MoneyMan\Money |
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*/ |
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public function exchange(Money $base, Currency $quote) |
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{ |
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// If they are of the same currency, there's no need to query the service. |
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$exchange_rate = $base->getCurrency()->equals($quote) |
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? 1.00000 |
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: $this->getExchangeRate($base->getCurrency(), $quote); |
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return new Money( |
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(int) round($base->getAmount() * $exchange_rate, 0), |
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$quote |
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); |
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} |
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/** |
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* Gets the exchange rate between the base and quote currencies. |
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* |
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* @param Currency $base The currency we want to exchange from. |
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* @param Currency $quote The currency we want to exchange to. |
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* |
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* @return float |
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*/ |
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public function getExchangeRate(Currency $base, Currency $quote) |
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{ |
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$base_code = $base->getCode(); |
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$quote_code = $quote->getCode(); |
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return $this->service->latest("$base_code/$quote_code")->getValue(); |
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} |
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} |
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grahamsutton /
moneyman
