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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
*
* @category Piwik
* @package Piwik
*/
/**
* Delete all rows from the table that are not in the offset,offset+limit range
*
* @package Piwik
* @subpackage Piwik_DataTable
*/
class Piwik_DataTable_Filter_Limit extends Piwik_DataTable_Filter
{
/**
* Filter constructor.
*
* @param Piwik_DataTable $table
* @param int $offset Starting row (indexed from 0)
* @param int $limit Number of rows to keep (specify -1 to keep all rows)
* @param bool $keepSummaryRow Whether to keep the summary row or not.
*/
public function __construct($table, $offset, $limit = null, $keepSummaryRow = false)
{
parent::__construct($table);
$this->offset = $offset;
if (is_null($limit)) {
$limit = -1;
}
$this->limit = $limit;
$this->keepSummaryRow = $keepSummaryRow;
}
/**
* Limits the given data table
*
* @param Piwik_DataTable $table
*/
public function filter($table)
{
$table->setRowsCountBeforeLimitFilter();
if ($this->keepSummaryRow) {
$summaryRow = $table->getRowFromId(Piwik_DataTable::ID_SUMMARY_ROW);
}
// we delete from 0 to offset
if ($this->offset > 0) {
$table->deleteRowsOffset(0, $this->offset);
}
// at this point the array has offset less elements. We delete from limit to the end
if ($this->limit >= 0) {
$table->deleteRowsOffset($this->limit);
}
if ($this->keepSummaryRow && !empty($summaryRow)) {
$table->addSummaryRow($summaryRow);
}
}
}
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