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msd2/tracking/piwik/plugins/Events/Columns/Metrics/AverageEventValue.php

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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\Plugins\Events\Columns\Metrics;
+
+use Piwik\DataTable\Row;
+use Piwik\Piwik;
+use Piwik\Plugin\ProcessedMetric;
+
+/**
+ * The average value for a triggered event. Calculated as:
+ *
+ *     sum_event_value / nb_events_with_value
+ *
+ * sum_event_value and nb_events_with_value are calculated by the Event archiver.
+ */
+class AverageEventValue extends ProcessedMetric
+{
+    public function getName()
+    {
+        return 'avg_event_value';
+    }
+
+    public function getTranslatedName()
+    {
+        return Piwik::translate('Events_AvgValueDocumentation');
+    }
+
+    public function compute(Row $row)
+    {
+        $sumEventValue = $this->getMetric($row, 'sum_event_value');
+        $eventsWithValue = $this->getMetric($row, 'nb_events_with_value');
+
+        return Piwik::getQuotientSafe($sumEventValue, $eventsWithValue, $precision = 2);
+    }
+
+    public function getDependentMetrics()
+    {
+        return array('sum_event_value', 'nb_events_with_value');
+    }
+}