<?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
 */
namespace Piwik\DataTable\Filter;

use Piwik\DataTable;
use Piwik\DataTable\Filter;

/**
 * Delete all rows for which a given function returns false for a given column.
 *
 * @package Piwik
 * @subpackage DataTable
 */
class ColumnCallbackDeleteRow extends Filter
{
    private $columnToFilter;
    private $function;
    private $functionParams;

    /**
     * @param DataTable $table
     * @param string $columnToFilter
     * @param callback $function
     * @param array $functionParams
     */
    public function __construct($table, $columnToFilter, $function, $functionParams = array())
    {
        parent::__construct($table);

        if (!is_array($functionParams)) {
            $functionParams = array($functionParams);
        }

        $this->function = $function;
        $this->columnToFilter = $columnToFilter;
        $this->functionParams = $functionParams;
    }

    /**
     * Filters the given data table
     *
     * @param DataTable $table
     */
    public function filter($table)
    {
        foreach ($table->getRows() as $key => $row) {
            $columnValue = $row->getColumn($this->columnToFilter);
            if (!call_user_func_array($this->function, array_merge(array($columnValue), $this->functionParams))) {
                $table->deleteRow($key);
            }
            $this->filterSubTable($row);
        }
    }
}