vendor/doctrine/orm/lib/Doctrine/ORM/Tools/Pagination/CountWalker.php

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<?php
/**
 * Doctrine ORM
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to kontakt@beberlei.de so I can send you a copy immediately.
 */

namespace Doctrine\ORM\Tools\Pagination;

use Doctrine\ORM\Query\TreeWalkerAdapter;
use Doctrine\ORM\Query\AST\SelectStatement;
use Doctrine\ORM\Query\AST\SelectExpression;
use Doctrine\ORM\Query\AST\PathExpression;
use Doctrine\ORM\Query\AST\AggregateExpression;

/**
 * Replaces the selectClause of the AST with a COUNT statement.
 *
 * @category    DoctrineExtensions
 * @package     DoctrineExtensions\Paginate
 * @author      David Abdemoulaie <dave@hobodave.com>
 * @copyright   Copyright (c) 2010 David Abdemoulaie (http://hobodave.com/)
 * @license     http://hobodave.com/license.txt New BSD License
 */
class CountWalker extends TreeWalkerAdapter
{
    /**
     * Distinct mode hint name.
     */
    const HINT_DISTINCT = 'doctrine_paginator.distinct';

    /**
     * Walks down a SelectStatement AST node, modifying it to retrieve a COUNT.
     *
     * @param SelectStatement $AST
     *
     * @return void
     *
     * @throws \RuntimeException
     */
    public function walkSelectStatement(SelectStatement $AST)
    {
        if ($AST->havingClause) {
            throw new \RuntimeException('Cannot count query that uses a HAVING clause. Use the output walkers for pagination');
        }

        $rootComponents = array();
        foreach ($this->_getQueryComponents() as $dqlAlias => $qComp) {
            $isParent = array_key_exists('parent', $qComp)
                && $qComp['parent'] === null
                && $qComp['nestingLevel'] == 0
            ;
            if ($isParent) {
                $rootComponents[] = array($dqlAlias => $qComp);