update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/Goals/Columns/Metrics/AverageQuantity.php

@@ -0,0 +1,47 @@
+<?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\Goals\Columns\Metrics;
+
+use Piwik\DataTable\Row;
+use Piwik\Piwik;
+use Piwik\Plugin\ProcessedMetric;
+
+/**
+ * The average amount of products in each order or abandoned cart. Calculated as:
+ *
+ *     quantity / (orders or abandoned_carts)
+ *
+ * quantity, orders and abandoned_carts are calculated by the Goals archiver.
+ */
+class AverageQuantity extends ProcessedMetric
+{
+    public function getName()
+    {
+        return 'avg_quantity';
+    }
+
+    public function getTranslatedName()
+    {
+        return Piwik::translate('General_AverageQuantity');
+    }
+
+    public function compute(Row $row)
+    {
+        $quantity = $this->getMetric($row, 'quantity');
+        $orders = $this->getMetric($row, 'orders');
+        $abandonedCarts = $this->getMetric($row, 'abandoned_carts');
+
+        return Piwik::getQuotientSafe($quantity, $orders === false ? $abandonedCarts : $orders, $precision = 1);
+    }
+
+    public function getDependentMetrics()
+    {
+        return array('quantity', 'orders', 'abandoned_carts');
+    }
+}