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