vendor/doctrine/doctrine-cache-bundle/DependencyInjection/DoctrineCacheExtension.php

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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\Bundle\DoctrineCacheBundle\DependencyInjection;

use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;

/**
 * Cache Bundle Extension
 *
 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author Fabio B. Silva <fabio.bat.silva@gmail.com>
 * @author Danilo Cabello <danilo.cabello@gmail.com>
 */
class DoctrineCacheExtension extends Extension
{
    /**
     * @var \Doctrine\Bundle\DoctrineCacheBundle\DependencyInjection\CacheProviderLoader
     */
    private $loader;

    /**
     * @param \Doctrine\Bundle\DoctrineCacheBundle\DependencyInjection\CacheProviderLoader $loader
     */
    public function __construct(CacheProviderLoader $loader = null)
    {
        $this->loader = $loader ?: new CacheProviderLoader;
    }

    /**
     * {@inheritdoc}
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $rootConfig    = $this->processConfiguration($configuration, $configs);

        $locator = new FileLocator(__DIR__ . '/../Resources/config/');
        $loader  = new XmlFileLoader($container, $locator);