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<?php declare(strict_types=1); |
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/** |
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* This file is part of the daikon-cqrs/value-object project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Daikon\ValueObject; |
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use Daikon\Interop\Assertion; |
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use Daikon\Interop\MakeEmptyInterface; |
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final class Natural implements MakeEmptyInterface, ValueObjectInterface |
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{ |
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private ?int $value; |
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public function isZero(): bool |
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{ |
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$this->assertNotEmpty(); |
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return $this->value === 0; |
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} |
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public function isEmpty(): bool |
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{ |
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return $this->value === null; |
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} |
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public function add(self $amount): self |
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{ |
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$this->assertNotEmpty(); |
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Assertion::false($amount->isEmpty(), 'Addition must not be empty.'); |
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return self::fromNative((int)$this->toNative() + (int)$amount->toNative()); |
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} |
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public function subtract(self $amount): self |
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{ |
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$this->assertNotEmpty(); |
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Assertion::false($amount->isEmpty(), 'Subtraction must not be empty.'); |
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return self::fromNative((int)$this->toNative() - (int)$amount->toNative()); |
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} |
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public function isGreaterThanOrEqualTo(self $comparator): bool |
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{ |
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$this->assertNotEmpty(); |
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Assertion::false($comparator->isEmpty(), 'Comparator must not be empty.'); |
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return $this->toNative() >= $comparator->toNative(); |
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} |
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public function isLessThanOrEqualTo(self $comparator): bool |
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{ |
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$this->assertNotEmpty(); |
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Assertion::false($comparator->isEmpty(), 'Comparator must not be empty.'); |
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return $this->toNative() <= $comparator->toNative(); |
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} |
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public function isGreaterThan(self $comparator): bool |
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{ |
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$this->assertNotEmpty(); |
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Assertion::false($comparator->isEmpty(), 'Comparator must not be empty.'); |
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return $this->toNative() > $comparator->toNative(); |
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} |
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public function isLessThan(self $comparator): bool |
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{ |
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$this->assertNotEmpty(); |
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Assertion::false($comparator->isEmpty(), 'Comparator must not be empty.'); |
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return $this->toNative() < $comparator->toNative(); |
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} |
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public static function makeEmpty(): self |
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{ |
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return new self; |
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} |
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public static function zero(): self |
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{ |
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return new self(0); |
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} |
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/** @param null|int|string $value */ |
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public static function fromNative($value): self |
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{ |
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$value = $value === '' ? null : $value; |
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Assertion::nullOrIntegerish($value, 'Trying to create Natural VO from unsupported value type.'); |
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return $value === null ? new self : new self((int)$value); |
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} |
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public function toNative(): ?int |
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{ |
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return $this->value; |
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} |
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/** @param self $comparator */ |
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public function equals($comparator): bool |
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{ |
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Assertion::isInstanceOf($comparator, self::class); |
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return $this->toNative() === $comparator->toNative(); |
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} |
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public function __toString(): string |
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{ |
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return (string)$this->value; |
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} |
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private function assertNotEmpty(): void |
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{ |
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Assertion::false($this->isEmpty(), 'Natural is empty.'); |
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} |
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private function __construct(int $value = null) |
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{ |
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Assertion::nullOrGreaterOrEqualThan($value, 0, 'Must be at least 0.'); |
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$this->value = $value; |
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} |
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} |
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daikon-cqrs /
value-object
