DoctrineDbal2ModifiersAdapter.php
<?php
/*
* This file is part of the Pagerfanta Adapters project, Doctrine DBAL package.
*
* (c) Jean-Bernard Addor
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace PagerfantaAdapters\Doctrine\DBAL;
use Doctrine\DBAL\Query\QueryBuilder;
use Pagerfanta\Adapter\AdapterInterface;
use Pagerfanta\Exception\InvalidArgumentException;
/**
* @author Jean-Bernard Addor <jean-bernard.addor@umontreal.ca>
* @author Michael Williams <michael@whizdevelopment.com>
* @author Pablo Díez <pablodip@gmail.com>
*/
class DoctrineDbal2ModifiersAdapter implements AdapterInterface
{
private $queryBuilder;
private $finishQueryBuilderModifier;
private $countQueryBuilderModifier;
/**
* Constructor.
*
* @param QueryBuilder $queryBuilder A DBAL query builder
* @param callable $countQueryBuilderModifier A callable to modifier the query builder to count
*/
public function __construct(QueryBuilder $queryBuilder, $finishQueryBuilderModifier, $countQueryBuilderModifier)
{
if (QueryBuilder::SELECT !== $queryBuilder->getType()) {
throw new InvalidArgumentException('Only SELECT queries can be paginated.');
}
if (!\is_callable($finishQueryBuilderModifier)) {
throw new InvalidArgumentException('The finish query builder modifier must be a callable.');
}
if (!\is_callable($countQueryBuilderModifier)) {
throw new InvalidArgumentException('The count query builder modifier must be a callable.');
}
$this->queryBuilder = clone $queryBuilder;
$this->finishQueryBuilderModifier = $finishQueryBuilderModifier;
$this->countQueryBuilderModifier = $countQueryBuilderModifier;
}
/**
* {@inheritdoc}
*/
public function getNbResults()
{
$qb = $this->prepareCountQueryBuilder();
$result = $qb->execute()->fetchColumn();
return (int) $result;
}
private function prepareCountQueryBuilder()
{
$qb = clone $this->queryBuilder;
\call_user_func($this->countQueryBuilderModifier, $qb);
return $qb;
}
/**
* {@inheritdoc}
*/
public function getSlice($offset, $length)
{
$qb = clone $this->queryBuilder;
\call_user_func($this->finishQueryBuilderModifier, $qb);
$result = $qb->setMaxResults($length)
->setFirstResult($offset)
->execute();
return $result->fetchAll();
}
}