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<?php |
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declare(strict_types = 1); |
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namespace SyliusCart\Domain\ValueObject; |
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use SyliusCart\Domain\Exception\InvalidCartItemQuantityException; |
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/** |
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* @author Arkadiusz Krakowiak <[email protected]> |
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*/ |
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final class CartItemQuantity |
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{ |
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/** |
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* @var int |
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*/ |
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private $number; |
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/** |
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* @param int $number |
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*/ |
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private function __construct(int $number) |
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{ |
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$this->number = $number; |
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} |
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/** |
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* @param int $number |
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* |
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* @return CartItemQuantity |
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*/ |
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public static function create(int $number): self |
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{ |
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if (0 >= $number) { |
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throw new InvalidCartItemQuantityException('Cart item quantity cannot be equals or below zero.'); |
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} |
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return new self($number); |
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} |
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/** |
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* @param CartItemQuantity $quantity |
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* |
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* @return CartItemQuantity |
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*/ |
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public function add(CartItemQuantity $quantity): self |
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{ |
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$number = $this->number + $quantity->getNumber(); |
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return CartItemQuantity::create($number); |
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} |
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/** |
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* @param CartItemQuantity $quantity |
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* |
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* @return CartItemQuantity |
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*/ |
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public function subtract(CartItemQuantity $quantity): self |
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{ |
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$number = $this->number - $quantity->getNumber(); |
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return CartItemQuantity::create($number); |
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} |
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/** |
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* @param CartItemQuantity $quantity |
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* |
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* @return bool |
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*/ |
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public function equals(CartItemQuantity $quantity): bool |
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{ |
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return $quantity->getNumber() === $this->number; |
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} |
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/** |
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* @param CartItemQuantity $quantity |
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* |
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* @return bool |
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*/ |
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public function isHigherThan(CartItemQuantity $quantity): bool |
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{ |
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return $quantity->getNumber() < $this->number; |
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} |
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/** |
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* @param CartItemQuantity $quantity |
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* |
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* @return bool |
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*/ |
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public function isLowerThan(CartItemQuantity $quantity): bool |
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{ |
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return $quantity->getNumber() > $this->number; |
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} |
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/** |
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* @return int |
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*/ |
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public function getNumber(): int |
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{ |
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return $this->number; |
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} |
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} |
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Arminek /
Cart
