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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\Common\EventManager;

/**
 * Factory for creating Doctrine\DBAL\Connection instances.
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @since 2.0
 */
final class DriverManager
{
    /**
     * List of supported drivers and their mappings to the driver classes.
     *
     * To add your own driver use the 'driverClass' parameter to
     * {@link DriverManager::getConnection()}.
     *
     * @var array
     */
     private static $_driverMap = array(
            'pdo_mysql'  => 'Doctrine\DBAL\Driver\PDOMySql\Driver',
            'pdo_sqlite' => 'Doctrine\DBAL\Driver\PDOSqlite\Driver',
            'pdo_pgsql'  => 'Doctrine\DBAL\Driver\PDOPgSql\Driver',
            'pdo_oci' => 'Doctrine\DBAL\Driver\PDOOracle\Driver',
            'oci8' => 'Doctrine\DBAL\Driver\OCI8\Driver',
            'ibm_db2' => 'Doctrine\DBAL\Driver\IBMDB2\DB2Driver',
            'pdo_ibm' => 'Doctrine\DBAL\Driver\PDOIbm\Driver',
            'pdo_sqlsrv' => 'Doctrine\DBAL\Driver\PDOSqlsrv\Driver',
            'mysqli' => 'Doctrine\DBAL\Driver\Mysqli\Driver',
            'drizzle_pdo_mysql'  => 'Doctrine\DBAL\Driver\DrizzlePDOMySql\Driver',
            'sqlsrv' => 'Doctrine\DBAL\Driver\SQLSrv\Driver',
            );

    /**
     * Private constructor. This class cannot be instantiated.
     */
    private function __construct()
    {
    }

    /**
     * Creates a connection object based on the specified parameters.
     * This method returns a Doctrine\DBAL\Connection which wraps the underlying
     * driver connection.
     *
     * $params must contain at least one of the following.
     *
     * Either 'driver' with one of the following values:
     *
     *     pdo_mysql
     *     pdo_sqlite
     *     pdo_pgsql
     *     pdo_oci (unstable)
     *     pdo_sqlsrv
     *     pdo_ibm (unstable)
     *     pdo_sqlsrv
     *     mysqli
     *     sqlsrv
     *     ibm_db2 (unstable)
     *     drizzle_pdo_mysql
     *
     * OR 'driverClass' that contains the full class name (with namespace) of the
     * driver class to instantiate.
     *
     * Other (optional) parameters:
     *
     * <b>user (string)</b>:
     * The username to use when connecting.
     *
     * <b>password (string)</b>:
     * The password to use when connecting.
     *
     * <b>driverOptions (array)</b>:
     * Any additional driver-specific options for the driver. These are just passed
     * through to the driver.
     *
     * <b>pdo</b>:
     * You can pass an existing PDO instance through this parameter. The PDO
     * instance will be wrapped in a Doctrine\DBAL\Connection.
     *
     * <b>wrapperClass</b>:
     * You may specify a custom wrapper class through the 'wrapperClass'
     * parameter but this class MUST inherit from Doctrine\DBAL\Connection.
     *
     * <b>driverClass</b>:
     * The driver class to use.
     *
     * @param array                              $params       The parameters.
     * @param \Doctrine\DBAL\Configuration|null  $config       The configuration to use.
     * @param \Doctrine\Common\EventManager|null $eventManager The event manager to use.
     *
     * @return \Doctrine\DBAL\Connection
     *
     * @throws \Doctrine\DBAL\DBALException
     */
    public static function getConnection(
            array $params,
            Configuration $config = null,
            EventManager $eventManager = null)
    {
        // create default config and event manager, if not set
        if ( ! $config) {
            $config = new Configuration();
        }
        if ( ! $eventManager) {
            $eventManager = new EventManager();
        }

        // check for existing pdo object
        if (isset($params['pdo']) && ! $params['pdo'] instanceof \PDO) {
            throw DBALException::invalidPdoInstance();
        } else if (isset($params['pdo'])) {
            $params['pdo']->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
            $params['driver'] = 'pdo_' . $params['pdo']->getAttribute(\PDO::ATTR_DRIVER_NAME);
        } else {
            self::_checkParams($params);
        }
        if (isset($params['driverClass'])) {
            $className = $params['driverClass'];
        } else {
            $className = self::$_driverMap[$params['driver']];
        }

        $driver = new $className();

        $wrapperClass = 'Doctrine\DBAL\Connection';
        if (isset($params['wrapperClass'])) {
            if (is_subclass_of($params['wrapperClass'], $wrapperClass)) {
               $wrapperClass = $params['wrapperClass'];
            } else {
                throw DBALException::invalidWrapperClass($params['wrapperClass']);
            }
        }

        return new $wrapperClass($params, $driver, $config, $eventManager);
    }

    /**
     * Checks the list of parameters.
     *
     * @param array $params The list of parameters.
     *
     * @return void
     *
     * @throws \Doctrine\DBAL\DBALException
     */
    private static function _checkParams(array $params)
    {
        // check existence of mandatory parameters

        // driver
        if ( ! isset($params['driver']) && ! isset($params['driverClass'])) {
            throw DBALException::driverRequired();
        }

        // check validity of parameters

        // driver
        if ( isset($params['driver']) && ! isset(self::$_driverMap[$params['driver']])) {
            throw DBALException::unknownDriver($params['driver'], array_keys(self::$_driverMap));
        }

        if (isset($params['driverClass']) && ! in_array('Doctrine\DBAL\Driver', class_implements($params['driverClass'], true))) {
            throw DBALException::invalidDriverClass($params['driverClass']);
        }
    }
}