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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\ORM\Id;

use Doctrine\ORM\EntityManager;

/**
 * Id generator that obtains IDs from special "identity" columns. These are columns
 * that automatically get a database-generated, auto-incremented identifier on INSERT.
 * This generator obtains the last insert id after such an insert.
 */
class IdentityGenerator extends AbstractIdGenerator
{
    /**
     * The name of the sequence to pass to lastInsertId(), if any.
     *
     * @var string
     */
    private $sequenceName;

    /**
     * Constructor.
     *
     * @param string|null $sequenceName The name of the sequence to pass to lastInsertId()
     *                                  to obtain the last generated identifier within the current
     *                                  database session/connection, if any.
     */
    public function __construct($sequenceName = null)
    {
        $this->sequenceName = $sequenceName;
    }

    /**
     * {@inheritDoc}
     */
    public function generate(EntityManager $em, $entity)
    {
        return (int) $em->getConnection()->lastInsertId($this->sequenceName);
    }

    /**
     * {@inheritdoc}
     */
    public function isPostInsertGenerator()
    {
        return true;
    }
}