<?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 LGPL. For more information, see

 * <http://www.doctrine-project.org>.

 */

namespace Doctrine\ORM\Internal\Hydration;

use Doctrine\DBAL\Connection;

/**

 * Hydrator that hydrates a single scalar value from the result set.

 *

 * @author Roman Borschel <roman@code-factory.org>

 * @since 2.0

 */

class SingleScalarHydrator extends AbstractHydrator

{

    /** @override */

    protected function _hydrateAll()

    {

        $cache = array();

        $result = $this->_stmt->fetchAll(\PDO::FETCH_ASSOC);

        $num = count($result);

        if ($num == 0) {

            throw new \Doctrine\ORM\NoResultException;

        } else if ($num > 1 || count($result[key($result)]) > 1) {

            throw new \Doctrine\ORM\NonUniqueResultException;

        }

        $result = $this->_gatherScalarRowData($result[key($result)], $cache);

        return array_shift($result);

    }

}