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<?php
/**
* Piwik - Open source web analytics
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html Gpl v3 or later
* @version $Id$
*
* @package Piwik_DataTable
*/
/**
* Delete all rows from the table that are not in the offset,offset+limit range
*
* @package Piwik_DataTable
* @subpackage Piwik_DataTable_Filter
*/
class Piwik_DataTable_Filter_Limit extends Piwik_DataTable_Filter
{
/**
* Filter constructor.
*
* @param Piwik_DataTable $table
* @param int $offset Starting row
* @param int $limit Number of rows to keep (specify -1 to keep all rows)
*/
public function __construct( $table, $offset, $limit = null )
{
parent::__construct($table);
$this->offset = $offset;
if(is_null($limit))
{
$limit = -1;
}
$this->limit = $limit;
$this->filter();
}
protected function filter()
{
$table = $this->table;
$rowsCount = $table->getRowsCount();
// we have to delete
// - from 0 to offset
// at this point the array has offset less elements
// - from limit to the end
$table->deleteRowsOffset( 0, $this->offset );
if( $this->limit > 0 )
{
$table->deleteRowsOffset( $this->limit );
}
}
}
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