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