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<?php |
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declare(strict_types=1); |
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namespace WriteModel; |
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class CommandFactory |
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{ |
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/** @var string[] */ |
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private $fields; |
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/** @var callable */ |
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private $factoryMethod; |
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public function __construct(string ...$fields) |
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{ |
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$this->fields = $fields; |
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} |
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public function createBy(callable $factoryMethod): void |
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{ |
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$this->factoryMethod = $factoryMethod; |
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} |
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public function shouldBeCreated(array $data): bool |
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{ |
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if (empty($this->fields)) { |
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return true; |
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} |
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// command should be created if there is data for at least one command's field |
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$intersection = array_intersect(array_keys($data), $this->fields); |
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return count($intersection) > 0; |
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} |
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public function create(array $data) |
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{ |
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if (!is_callable($this->factoryMethod)) { |
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throw LogicException::factoryMethodIsNotProvided($this->fields); |
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} |
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$values = $this->resolveValues($data); |
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$command = call_user_func($this->factoryMethod, $values); |
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if (!is_object($command)) { |
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throw LogicException::commandIsNotAnObject(); |
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} |
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return $command; |
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} |
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private function resolveValues(array $data): array |
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{ |
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if (empty($this->fields)) { |
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return $data; |
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} |
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// use only data indicated in $fields array |
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$data = array_filter($data, function ($key) { |
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return in_array($key, $this->fields); |
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}, ARRAY_FILTER_USE_KEY); |
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// flip $fields to have it's value as keys in $defaults array and reset all values to null |
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$defaults = array_map(function () { |
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return null; |
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}, array_flip($this->fields)); |
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return array_merge($defaults, $data); |
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} |
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} |
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tomaszhanc /
cqrs-lite-write-model
