vendor/doctrine/dbal/lib/Doctrine/DBAL/Configuration.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\DBAL;

use Doctrine\DBAL\Logging\SQLLogger;
use Doctrine\Common\Cache\Cache;

/**
 * Configuration container for the Doctrine DBAL.
 *
 * @since    2.0
 * @author   Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author   Jonathan Wage <jonwage@gmail.com>
 * @author   Roman Borschel <roman@code-factory.org>
 * @internal When adding a new configuration option just write a getter/setter
 *           pair and add the option to the _attributes array with a proper default value.
 */
class Configuration
{
    /**
     * The attributes that are contained in the configuration.
     * Values are default values.
     *
     * @var array
     */
    protected $_attributes = array();

    /**
     * Sets the SQL logger to use. Defaults to NULL which means SQL logging is disabled.
     *
     * @param \Doctrine\DBAL\Logging\SQLLogger|null $logger
     *
     * @return void
     */
    public function setSQLLogger(SQLLogger $logger = null)
    {
        $this->_attributes['sqlLogger'] = $logger;
    }

    /**
     * Gets the SQL logger that is used.
     *
     * @return \Doctrine\DBAL\Logging\SQLLogger|null