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<?php
/**
* Matomo - free/libre analytics platform
*
* @link https://matomo.org
* @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*/
namespace Piwik\Columns;
use Piwik\Plugin\ArchivedMetric;
use Piwik\Plugin\ComputedMetric;
/**
* A factory to create computed metrics.
*
* @api since Piwik 3.2.0
*/
class ComputedMetricFactory
{
/**
* @var MetricsList
*/
private $metricsList = null;
/**
* Generates a new report metric factory.
* @param MetricsList $list A report list instance
* @ignore
*/
public function __construct(MetricsList $list)
{
$this->metricsList = $list;
}
/**
* @return \Piwik\Plugin\ComputedMetric
*/
public function createComputedMetric($metricName1, $metricName2, $aggregation)
{
$metric1 = $this->metricsList->getMetric($metricName1);
if (!$metric1 instanceof ArchivedMetric || !$metric1->getDimension()) {
throw new \Exception('Only possible to create computed metric for an archived metric with a dimension');
}
$dimension1 = $metric1->getDimension();
$metric = new ComputedMetric($metricName1, $metricName2, $aggregation);
$metric->setCategory($dimension1->getCategoryId());
return $metric;
}
}
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