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<?php
/*
 * This file is part of EC-CUBE
 *
 * Copyright(c) 2000-2015 LOCKON CO.,LTD. All Rights Reserved.
 *
 * http://www.lockon.co.jp/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
namespace Eccube\Form\DataTransformer;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
use Doctrine\Common\Persistence\ObjectManager;
class EntityToIdTransformer implements DataTransformerInterface {
    /**
     * @var ObjectManager
     */
    private $om;
    /**
     * @var string
     */
    private $className;
    /**
     * @param ObjectManager $om
     * @param string $className
     */
    public function __construct(ObjectManager $om, $className)
    {
        $this->om = $om;
        $this->className = $className;
    }
    public function transform($entity)
    {
        if (null === $entity) {
            return '';
        }
        return $entity->getId();
    }
    public function reverseTransform($id)
    {
        if (!$id) {
            return null;
        }
        $entity = $this->om
            ->getRepository($this->className)
            ->find($id)
        ;
        if (null === $entity) {
            throw new TransformationFailedException();
        }
        return $entity;
    }
}