/usr/share/php/Doctrine/ORM/Tools/Pagination/CountWalker.php is in php-doctrine-orm 2.5.14+dfsg-1.
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/**
* 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');
}
$queryComponents = $this->_getQueryComponents();
// Get the root entity and alias from the AST fromClause
$from = $AST->fromClause->identificationVariableDeclarations;
if (count($from) > 1) {
throw new \RuntimeException("Cannot count query which selects two FROM components, cannot make distinction");
}
$fromRoot = reset($from);
$rootAlias = $fromRoot->rangeVariableDeclaration->aliasIdentificationVariable;
$rootClass = $queryComponents[$rootAlias]['metadata'];
$identifierFieldName = $rootClass->getSingleIdentifierFieldName();
$pathType = PathExpression::TYPE_STATE_FIELD;
if (isset($rootClass->associationMappings[$identifierFieldName])) {
$pathType = PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION;
}
$pathExpression = new PathExpression(
PathExpression::TYPE_STATE_FIELD | PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION, $rootAlias,
$identifierFieldName
);
$pathExpression->type = $pathType;
$distinct = $this->_getQuery()->getHint(self::HINT_DISTINCT);
$AST->selectClause->selectExpressions = array(
new SelectExpression(
new AggregateExpression('count', $pathExpression, $distinct), null
)
);
// ORDER BY is not needed, only increases query execution through unnecessary sorting.
$AST->orderByClause = null;
}
}
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