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doctrine2/lib/Doctrine/ORM/Tools/Pagination/WhereInWalker.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. This license can also be viewed
* at http://hobodave.com/license.txt
*
* @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
*/
namespace Doctrine\ORM\Tools\Pagination;
use Doctrine\ORM\Query\AST\ArithmeticExpression,
Doctrine\ORM\Query\AST\SimpleArithmeticExpression,
Doctrine\ORM\Query\TreeWalkerAdapter,
Doctrine\ORM\Query\AST\SelectStatement,
Doctrine\ORM\Query\AST\PathExpression,
Doctrine\ORM\Query\AST\InExpression,
Doctrine\ORM\Query\AST\NullComparisonExpression,
Doctrine\ORM\Query\AST\InputParameter,
Doctrine\ORM\Query\AST\ConditionalPrimary,
Doctrine\ORM\Query\AST\ConditionalTerm,
Doctrine\ORM\Query\AST\ConditionalExpression,
Doctrine\ORM\Query\AST\ConditionalFactor,
Doctrine\ORM\Query\AST\WhereClause;
/**
* Replaces the whereClause of the AST with a WHERE id IN (:foo_1, :foo_2) equivalent
*
* @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 WhereInWalker extends TreeWalkerAdapter
{
/**
* ID Count hint name
*/
const HINT_PAGINATOR_ID_COUNT = 'doctrine.id.count';
/**
* Primary key alias for query
*/
const PAGINATOR_ID_ALIAS = 'dpid';
/**
* Replaces the whereClause in the AST
*
* Generates a clause equivalent to WHERE IN (:dpid_1, :dpid_2, ...)
*
* The parameter namespace (dpid) is defined by
* the PAGINATOR_ID_ALIAS
*
* The total number of parameters is retrieved from
* the HINT_PAGINATOR_ID_COUNT query hint
*
* @param SelectStatement $AST
* @return void
*/
public function walkSelectStatement(SelectStatement $AST)
{
$rootComponents = array();
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foreach ($this->_getQueryComponents() as $dqlAlias => $qComp) {
$isParent = array_key_exists('parent', $qComp)
&& $qComp['parent'] === null
&& $qComp['nestingLevel'] == 0
;
if ($isParent) {
$rootComponents[] = array($dqlAlias => $qComp);
}
}
if (count($rootComponents) > 1) {
throw new \RuntimeException("Cannot count query which selects two FROM components, cannot make distinction");
}
$root = reset($rootComponents);
$parentName = key($root);
$parent = current($root);
$pathExpression = new PathExpression(
PathExpression::TYPE_STATE_FIELD, $parentName, $parent['metadata']->getSingleIdentifierFieldName()
);
$pathExpression->type = PathExpression::TYPE_STATE_FIELD;
$count = $this->_getQuery()->getHint(self::HINT_PAGINATOR_ID_COUNT);
if ($count > 0) {
$arithmeticExpression = new ArithmeticExpression();
$arithmeticExpression->simpleArithmeticExpression = new SimpleArithmeticExpression(
array($pathExpression)
);
$expression = new InExpression($arithmeticExpression);
$ns = self::PAGINATOR_ID_ALIAS;
for ($i = 1; $i <= $count; $i++) {
$expression->literals[] = new InputParameter(":{$ns}_$i");
}
} else {
$expression = new NullComparisonExpression($pathExpression);
$expression->not = false;
}
$conditionalPrimary = new ConditionalPrimary;
$conditionalPrimary->simpleConditionalExpression = $expression;
if ($AST->whereClause) {
if ($AST->whereClause->conditionalExpression instanceof ConditionalTerm) {
$AST->whereClause->conditionalExpression->conditionalFactors[] = $conditionalPrimary;
} elseif ($AST->whereClause->conditionalExpression instanceof ConditionalPrimary) {
$AST->whereClause->conditionalExpression = new ConditionalExpression(array(
new ConditionalTerm(array(
$AST->whereClause->conditionalExpression,
$conditionalPrimary
))
));
} elseif ($AST->whereClause->conditionalExpression instanceof ConditionalExpression
|| $AST->whereClause->conditionalExpression instanceof ConditionalFactor
) {
$tmpPrimary = new ConditionalPrimary;
$tmpPrimary->conditionalExpression = $AST->whereClause->conditionalExpression;
$AST->whereClause->conditionalExpression = new ConditionalTerm(array(
$tmpPrimary,
$conditionalPrimary
));
}
} else {
$AST->whereClause = new WhereClause(
new ConditionalExpression(array(
new ConditionalTerm(array(
$conditionalPrimary
))
))
);
}
}
}