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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
*/
/**
* DataTable filter that will group DataTable rows together based on the results
* of a reduce function. Rows with the same reduce result will be summed and merged.
*
* NOTE: This filter should never be queued, it must be applied directly on a DataTable.
*
* @package Piwik
* @subpackage Piwik_DataTable
*/
class Piwik_DataTable_Filter_GroupBy extends Piwik_DataTable_Filter
{
/**
* The name of the columns to reduce.
* @var string
*/
private $groupByColumn;
/**
* A callback that modifies the $groupByColumn of each row in some way. Rows with
* the same reduction result will be added together.
*/
private $reduceFunction;
/**
* Extra parameters to pass to the reduce function.
*/
private $parameters;
/**
* Constructor.
*
* @param Piwik_DataTable $table The DataTable to filter.
* @param string $groupByColumn The column name to reduce.
* @param mixed $reduceFunction The reduce function. This must alter the $groupByColumn in some way.
* @param array $parameters Extra parameters to supply to the reduce function.
*/
public function __construct( $table, $groupByColumn, $reduceFunction, $parameters = array() )
{
parent::__construct($table);
$this->groupByColumn = $groupByColumn;
$this->reduceFunction = $reduceFunction;
$this->parameters = $parameters;
}
/**
* Applies the reduce function to each row and merges rows w/ the same reduce result.
*
* @param Piwik_DataTable $table
*/
public function filter( $table )
{
$groupByRows = array();
$nonGroupByRowIds = array();
foreach ($table->getRows() as $rowId => $row)
{
// skip the summary row
if ($rowId == Piwik_DataTable::ID_SUMMARY_ROW)
{
continue;
}
// reduce the group by column of this row
$groupByColumnValue = $row->getColumn($this->groupByColumn);
$parameters = array_merge(array($groupByColumnValue), $this->parameters);
$groupByValue = call_user_func_array($this->reduceFunction, $parameters);
if (!isset($groupByRows[$groupByValue]))
{
// if we haven't encountered this group by value before, we mark this row as a
// row to keep, and change the group by column to the reduced value.
$groupByRows[$groupByValue] = $row;
$row->setColumn($this->groupByColumn, $groupByValue);
}
else
{
// if we have already encountered this group by value, we add this row to the
// row that will be kept, and mark this one for deletion
$groupByRows[$groupByValue]->sumRow($row);
$nonGroupByRowIds[] = $rowId;
}
}
// delete the unneeded rows.
$table->deleteRows($nonGroupByRowIds);
}
}
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