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<?php
/**
* Piwik - free/libre analytics platform
*
* @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;
use Piwik\Plugins\CoreHome\Columns\Metrics\CallableProcessedMetric;
/**
* Adds a new column to every row of a {@link DataTable} based on the result of callback.
*
* **Basic usage example**
*
* $callback = function ($visits, $timeSpent) {
* return round($timeSpent / $visits, 2);
* };
*
* $dataTable->filter('ColumnCallbackAddColumn', array(array('nb_visits', 'sum_time_spent'), 'avg_time_on_site', $callback));
*
* @api
*/
class ColumnCallbackAddColumn extends BaseFilter
{
/**
* 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 callable $functionToApply The callback to apply to each row of a DataTable. The columns
* specified in `$columns` are passed to this callback.
* @param array $functionParameters deprecated - use an [anonymous function](http://php.net/manual/en/functions.anonymous.php)
* instead.
*/
public function __construct($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;
}
/**
* See {@link ColumnCallbackAddColumn}.
*
* @param DataTable $table The table to filter.
*/
public function filter($table)
{
$columns = $this->columns;
$functionParams = $this->functionParameters;
$functionToApply = $this->functionToApply;
$extraProcessedMetrics = $table->getMetadata(DataTable::EXTRA_PROCESSED_METRICS_METADATA_NAME);
if (empty($extraProcessedMetrics)) {
$extraProcessedMetrics = array();
}
$metric = new CallableProcessedMetric($this->columnToAdd, function (DataTable\Row $row) use ($columns, $functionParams, $functionToApply) {
$columnValues = array();
foreach ($columns as $column) {
$columnValues[] = $row->getColumn($column);
}
$parameters = array_merge($columnValues, $functionParams);
return call_user_func_array($functionToApply, $parameters);
}, $columns);
$extraProcessedMetrics[] = $metric;
$table->setMetadata(DataTable::EXTRA_PROCESSED_METRICS_METADATA_NAME, $extraProcessedMetrics);
foreach ($table->getRows() as $row) {
$row->setColumn($this->columnToAdd, $metric->compute($row));
$this->filterSubTable($row);
}
}
}
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