public function delete(Application $app, Request $request, $id = null)
    {
        $this->isTokenValid($app);
        $session = $request->getSession();
        $page_no = intval($session->get('eccube.admin.product.search.page_no'));
        $page_no = $page_no ? $page_no : Constant::ENABLED;

        if (!is_null($id)) {
            /* @var $Product \Eccube\Entity\Product */
            $Product = $app['eccube.repository.product']->find($id);
            if (!$Product) {
                $app->deleteMessage();
                return $app->redirect($app->url('admin_product_page', array('page_no' => $page_no)).'?resume='.Constant::ENABLED);
            }

            if ($Product instanceof \Eccube\Entity\Product) {
                log_info('商品削除開始', array($id));

                $Product->setDelFlg(Constant::ENABLED);

                $ProductClasses = $Product->getProductClasses();
                $deleteImages = array();
                foreach ($ProductClasses as $ProductClass) {
                    $ProductClass->setDelFlg(Constant::ENABLED);
                    $Product->removeProductClass($ProductClass);

                    $ProductClasses = $Product->getProductClasses();
                    foreach ($ProductClasses as $ProductClass) {
                        $ProductClass->setDelFlg(Constant::ENABLED);
                        $Product->removeProductClass($ProductClass);

                        $ProductStock = $ProductClass->getProductStock();
                        $app['orm.em']->remove($ProductStock);
                    }

                    $ProductImages = $Product->getProductImage();
                    foreach ($ProductImages as $ProductImage) {
                        $Product->removeProductImage($ProductImage);
                        $deleteImages[] = $ProductImage->getFileName();
                        $app['orm.em']->remove($ProductImage);
                    }

                    $ProductCategories = $Product->getProductCategories();
                    foreach ($ProductCategories as $ProductCategory) {
                        $Product->removeProductCategory($ProductCategory);
                        $app['orm.em']->remove($ProductCategory);
                    }

                }

                $app['orm.em']->persist($Product);

                $app['orm.em']->flush();

                $event = new EventArgs(
                    array(
                        'Product' => $Product,
                        'ProductClass' => $ProductClasses,
                        'deleteImages' => $deleteImages,
                    ),
                    $request
                );
                $app['eccube.event.dispatcher']->dispatch(EccubeEvents::ADMIN_PRODUCT_DELETE_COMPLETE, $event);
                $deleteImages = $event->getArgument('deleteImages');

                // 画像ファイルの削除(commit後に削除させる)
                foreach ($deleteImages as $deleteImage) {
                    try {
                        $fs = new Filesystem();
                        $fs->remove($app['config']['image_save_realdir'] . '/' . $deleteImage);
                    } catch (\Exception $e) {
                        // エラーが発生しても無視する
                    }
                }

                log_info('商品削除完了', array($id));

                $app->addSuccess('admin.delete.complete', 'admin');
            } else {
                log_info('商品削除エラー', array($id));
                $app->addError('admin.delete.failed', 'admin');
            }
        } else {
            log_info('商品削除エラー', array($id));
            $app->addError('admin.delete.failed', 'admin');
        }

        return $app->redirect($app->url('admin_product_page', array('page_no' => $page_no)).'?resume='.Constant::ENABLED);
    }