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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
*/
namespace Piwik\DataTable\Filter;
use Piwik\DataTable;
use Piwik\DataTable\Filter;
/**
* Adds a new column to every row of a DataTable based on the result of callback.
*
* @package Piwik
* @subpackage DataTable
*/
class ColumnCallbackAddColumn extends Filter
{
/**
* The names of the columns to pass to the callback.
*/
private $columns;
/**
* The name of the column to add.
*/
private $columnToAdd;
/**
* The callback to apply to each row of the DataTable. The result is added as
* the value of a new column.
*/
private $functionToApply;
/**
* Extra parameters to pass to the callback.
*/
private $functionParameters;
/**
* Constructor.
*
* @param DataTable $table The DataTable that will be filtered.
* @param array|string $columns The names of the columns to pass to the callback.
* @param string $columnToAdd The name of the column to add.
* @param mixed $functionToApply The callback to apply to each row of a DataTable.
* @param array $functionParameters Extra parameters to pass to $functionToApply.
*/
public function __construct($table, $columns, $columnToAdd, $functionToApply, $functionParameters = array())
{
parent::__construct($table);
if (!is_array($columns)) {
$columns = array($columns);
}
$this->columns = $columns;
$this->columnToAdd = $columnToAdd;
$this->functionToApply = $functionToApply;
$this->functionParameters = $functionParameters;
}
/**
* Executes a callback on every row of the supplied table and adds the result of
* the callback as a new column to each row.
*
* @param DataTable $table The table to filter.
*/
public function filter($table)
{
foreach ($table->getRows() as $row) {
$columnValues = array();
foreach ($this->columns as $column) {
$columnValues[] = $row->getColumn($column);
}
$parameters = array_merge($columnValues, $this->functionParameters);
$value = call_user_func_array($this->functionToApply, $parameters);
$row->setColumn($this->columnToAdd, $value);
$this->filterSubTable($row);
}
}
}
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