<?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: Truncate.php 6353 2012-05-28 17:29:23Z SteveG $
 * 
 * @category Piwik
 * @package Piwik
 */

/**
 * @package Piwik
 * @subpackage Piwik_DataTable
 */
class Piwik_DataTable_Filter_Truncate extends Piwik_DataTable_Filter
{
	/**
	 * @param Piwik_DataTable  $table
	 * @param int              $truncateAfter
	 */
	public function __construct( $table, $truncateAfter)
	{
		parent::__construct($table);
		$this->truncateAfter = $truncateAfter;
	}	

	/**
	 * Truncates the table after X rows and adds a summary row
	 *
	 * @param Piwik_DataTable  $table
	 */
	public function filter($table)
	{
		$table->filter('AddSummaryRow', array($this->truncateAfter));
		$table->filter('ReplaceSummaryRowLabel');
	
		foreach($table->getRows() as $row)
		{
			try {
				$idSubTable = $row->getIdSubDataTable();
				$subTable = Piwik_DataTable_Manager::getInstance()->getTable($idSubTable);
				$subTable->filter('Truncate', array($this->truncateAfter));
			} catch(Exception $e) {
				// there is no subtable loaded for example
			}
		}
	}
}
