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<?php |
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namespace Kanunak\Money; |
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class Money |
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{ |
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const NUMBER_OF_DECIMALS = 4; |
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/** @var Currency */ |
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private $currency; |
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/** @var int */ |
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private $value; |
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/** |
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* @param Currency $currency |
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* @param int $value |
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*/ |
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public function __construct(Currency $currency, $value) |
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{ |
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$this->validateValue($value); |
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$this->currency = $currency; |
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$this->value = $value; |
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} |
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/** |
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* @return Currency |
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*/ |
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public function currency() |
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{ |
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return $this->currency; |
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} |
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/** |
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* @return int |
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*/ |
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public function value() |
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{ |
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return $this->value; |
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} |
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/** |
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* @return int |
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*/ |
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public function decimals() |
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{ |
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return self::NUMBER_OF_DECIMALS; |
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} |
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/** |
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* @param Money $moneyToAdd |
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* @return Money |
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* @throw \InvalidArgumentException |
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*/ |
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public function add(Money $moneyToAdd) |
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{ |
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if (!$this->isSameCurrency($moneyToAdd)) { |
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throw new \InvalidArgumentException('Currencies does not match'); |
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} |
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return new Money($this->currency(), $this->value() + $moneyToAdd->value()); |
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} |
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/** |
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* @param Money $moneyToSubtract |
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* @return Money |
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* @throw \InvalidArgumentException |
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*/ |
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public function subtract(Money $moneyToSubtract) |
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{ |
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if (!$this->isSameCurrency($moneyToSubtract)) { |
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throw new \InvalidArgumentException('Currencies does not match'); |
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} |
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return new Money($this->currency(), $this->value() - $moneyToSubtract->value()); |
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} |
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/** |
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* @param Money $moneyToCompare |
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* @return bool |
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* @throw \InvalidArgumentException |
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*/ |
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public function equals(Money $moneyToCompare) |
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{ |
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if ($this->isSameCurrency($moneyToCompare)) { |
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return $this->value() === $moneyToCompare->value(); |
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} |
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return false; |
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} |
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/** |
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* @param CurrencyPair $currencyPair |
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* @return Money |
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* @throw \InvalidArgumentException |
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*/ |
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public function exchange(CurrencyPair $currencyPair) |
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{ |
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if (!$this->isSameCurrencyInCurrencyPair($currencyPair)) { |
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throw new \InvalidArgumentException('CurrencyFrom in the CurrencyPair does not match the money currency'); |
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} |
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return new Money($currencyPair->currencyTo(), (int)($this->value() * $currencyPair->ratio())); |
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} |
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/** |
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* @param CurrencyPair $currencyPair |
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* @return bool |
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*/ |
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private function isSameCurrencyInCurrencyPair(CurrencyPair $currencyPair) |
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{ |
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return ($this->currency()->equals($currencyPair->currencyFrom())); |
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} |
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/** |
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* @param Money $money |
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* @return bool |
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*/ |
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private function isSameCurrency(Money $money) |
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{ |
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return ($this->currency()->equals($money->currency())); |
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} |
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/** |
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* @param $value |
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* @thrown \InvalidArgumentException |
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*/ |
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private function validateValue($value) |
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{ |
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if (!is_integer($value)) { |
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throw new \InvalidArgumentException('Provided value is not an integer: '.$value); |
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} |
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} |
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} |
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Kanunak /
money
