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Pager.php
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Pager.php
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<?php
/*
* This file is part of the LyraAdminBundle package.
*
* Copyright 2011-2012 Massimo Giagnoni <gimassimo@gmail.com>
*
* This source file is subject to the MIT license. Full copyright and license
* information are in the LICENSE file distributed with this source code.
*/
namespace Lyra\AdminBundle\Pager;
use Lyra\AdminBundle\QueryBuilder\QueryBuilderInterface;
/**
* List pager class.
*/
class Pager implements PagerInterface
{
/**
* @var \Lyra\AdminBundle\QueryBuilder\QueryBuilderInterface
*/
protected $baseQueryBuilder;
/**
* @var mixed
*/
protected $queryBuilder;
/**
* @var mixed
*/
protected $countQueryBuilder;
/**
* @var integer
*/
protected $page;
/**
* @var integer
*/
protected $maxRows;
/**
* @var integer
*/
protected $maxPageLinks = 7;
/**
* @var integer
*/
protected $total;
public function setQueryBuilder(QueryBuilderInterface $qb)
{
$this->baseQueryBuilder = $qb;
}
public function getQueryBuilder()
{
return $this->baseQueryBuilder;
}
public function setPage($page)
{
$this->page = $page;
}
public function getPage()
{
return $this->page;
}
public function setMaxRows($max)
{
$this->maxRows = $max;
}
public function getMaxRows()
{
return $this->maxRows;
}
public function getTotal()
{
if (null === $this->total) {
$this->initQueryBuilders();
$alias = $this->countQueryBuilder->getRootAlias();
$this->total = $this->countQueryBuilder
->select('COUNT('.$alias.')')
->setFirstResult(null)
->getQuery()->getSingleScalarResult();
}
return $this->total;
}
public function getResults()
{
$this->initQueryBuilders();
$maxRows = $this->getMaxRows();
$alias = $this->queryBuilder->getRootAlias();
$page = min($this->getPage(), max(1, $this->getNbPages()));
return $this->queryBuilder
->select($alias)
->setFirstResult(($page - 1) * $maxRows)
->setMaxResults($maxRows)
->getQuery()->getResult();
}
public function getNbPages()
{
return ceil($this->getTotal() / $this->getMaxRows());
}
public function getPrevPage()
{
return max(1, $this->getPage() - 1);
}
public function getNextPage()
{
return min($this->getNbPages(), $this->getPage() + 1);
}
public function getPageLinks()
{
$page = $this->getPage();
$start = max(1, $page - floor($this->maxPageLinks / 2));
$end = min($this->getNbPages(), $page + $this->maxPageLinks - ($page - $start + 1));
$start = max(1, $start - ($this->maxPageLinks - ($end - $start + 1)));
return range($start, $end);
}
protected function initQueryBuilders()
{
if (null === $this->queryBuilder) {
$this->queryBuilder = $this->baseQueryBuilder->buildQuery();
$this->countQueryBuilder = clone $this->queryBuilder;
$this->countQueryBuilder->resetDQLPart('orderBy');
}
}
}