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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
*
*/
namespace Piwik\DataTable\Filter;
use Piwik\DataTable;
use Piwik\DataTable\BaseFilter;
/**
* Delete all rows from the table that are not in the given [offset, offset+limit) range.
*
* **Basic example usage**
*
* // delete all rows from 5 -> 15
* $dataTable->filter('Limit', array(5, 10));
*
* @api
*/
class Limit extends BaseFilter
{
/**
* Constructor.
*
* @param DataTable $table The DataTable that will be filtered eventually.
* @param int $offset The starting row index to keep.
* @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 = -1, $keepSummaryRow = false)
{
parent::__construct($table);
$this->offset = $offset;
$this->limit = $limit;
$this->keepSummaryRow = $keepSummaryRow;
}
/**
* See {@link Limit}.
*
* @param DataTable $table
*/
public function filter($table)
{
$table->setMetadata(DataTable::TOTAL_ROWS_BEFORE_LIMIT_METADATA_NAME, $table->getRowsCount());
if ($this->keepSummaryRow) {
$summaryRow = $table->getRowFromId(DataTable::ID_SUMMARY_ROW);
}
// we delete from 0 to offset
if ($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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