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<?php |
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namespace Daikon\Entity\Entity; |
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use Daikon\Entity\EntityType\AttributeInterface; |
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use Daikon\Entity\Exception\UnexpectedType; |
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final class EntityDiff |
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{ |
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public function __invoke(EntityInterface $left, EntityInterface $right): ValueObjectMap |
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{ |
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$this->assertComparabiliy($left, $right); |
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return ValueObjectMap::forEntity($left, array_reduce( |
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$this->listAtrributeNames($left), |
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function (array $diff, string $attribute) use ($left, $right): array { |
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if ($this->bothEntitesHaveValueSet($attribute, $left, $right)) { |
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$diff = $this->addValueIfDifferent($diff, $attribute, $left, $right); |
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} elseif ($left->has($attribute)) { |
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$diff[$attribute] = $left->get($attribute); |
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} |
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return $diff; |
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}, |
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[] |
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)); |
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} |
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private function assertComparabiliy(EntityInterface $left, EntityInterface $right) |
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{ |
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if ($left->getEntityType() !== $right->getEntityType()) { |
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throw new UnexpectedType('Comparing entities of different types is not supported.'); |
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} |
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} |
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private function listAtrributeNames(EntityInterface $entity): array |
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{ |
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return array_keys($entity->getEntityType()->getAttributes()->toArray()); |
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} |
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private function bothEntitesHaveValueSet(string $attribute, EntityInterface $left, EntityInterface $right): bool |
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{ |
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return $left->has($attribute) && $right->has($attribute); |
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} |
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private function addValueIfDifferent(array $diff, string $attribute, EntityInterface $left, $right): array |
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{ |
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if (!$left->get($attribute)->equals($right->get($attribute))) { |
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$diff[$attribute] = $left->get($attribute); |
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} |
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return $diff; |
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} |
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} |
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daikon-cqrs /
entity
