Files
DesignPatternsPHP/Structural/DataMapper/UserMapper.php
2019-12-14 13:41:03 +01:00

38 lines
970 B
PHP

<?php declare(strict_types=1);
namespace DesignPatterns\Structural\DataMapper;
use InvalidArgumentException;
class UserMapper
{
private StorageAdapter $adapter;
public function __construct(StorageAdapter $storage)
{
$this->adapter = $storage;
}
/**
* finds a user from storage based on ID and returns a User object located
* in memory. Normally this kind of logic will be implemented using the Repository pattern.
* However the important part is in mapRowToUser() below, that will create a business object from the
* data fetched from storage
*/
public function findById(int $id): User
{
$result = $this->adapter->find($id);
if ($result === null) {
throw new InvalidArgumentException("User #$id not found");
}
return $this->mapRowToUser($result);
}
private function mapRowToUser(array $row): User
{
return User::fromState($row);
}
}