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msd2/tracking/piwik/plugins/Actions/Columns/Metrics/AverageTimeOnPage.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\Actions\Columns\Metrics;
+
+use Piwik\DataTable\Row;
+use Piwik\Metrics\Formatter;
+use Piwik\Piwik;
+use Piwik\Plugin\ProcessedMetric;
+
+/**
+ * The average amount of time spent on a page. Calculated as:
+ *
+ *     sum_time_spent / nb_visits
+ *
+ * sum_time_spent and nb_visits are calculated by Archiver classes.
+ */
+class AverageTimeOnPage extends ProcessedMetric
+{
+    public function getName()
+    {
+        return 'avg_time_on_page';
+    }
+
+    public function getTranslatedName()
+    {
+        return Piwik::translate('General_ColumnAverageTimeOnPage');
+    }
+
+    public function compute(Row $row)
+    {
+        $sumTimeSpent = $this->getMetric($row, 'sum_time_spent');
+        $visits = $this->getMetric($row, 'nb_hits');
+
+        return Piwik::getQuotientSafe($sumTimeSpent, $visits, $precision = 0);
+    }
+
+    public function format($value, Formatter $formatter)
+    {
+        return $formatter->getPrettyTimeFromSeconds($value, $timeAsSentence = false);
+    }
+
+    public function getDependentMetrics()
+    {
+        return array('sum_time_spent', 'nb_hits');
+    }
+}