update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/Goals/Columns/Metrics/GoalSpecific/ConversionRate.php

@@ -0,0 +1,63 @@
+<?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\GoalSpecific;
+
+use Piwik\DataTable\Row;
+use Piwik\Metrics;
+use Piwik\Metrics\Formatter;
+use Piwik\Piwik;
+use Piwik\Plugins\Goals\Columns\Metrics\GoalSpecificProcessedMetric;
+use Piwik\Tracker\GoalManager;
+
+/**
+ * The conversion rate for a specific goal. Calculated as:
+ *
+ *     goal's nb_conversions / nb_visits
+ *
+ * The goal's nb_conversions is calculated by the Goal archiver and nb_visits
+ * by the core archiving process.
+ */
+class ConversionRate extends GoalSpecificProcessedMetric
+{
+    public function getName()
+    {
+        return $this->getColumnPrefix() . '_conversion_rate';
+    }
+
+    public function getTranslatedName()
+    {
+        return Piwik::translate('Goals_ConversionRate', $this->getGoalName());
+    }
+
+    public function getDocumentation()
+    {
+        return Piwik::translate('Goals_ColumnConversionRateDocumentation', $this->getGoalNameForDocs());
+    }
+
+    public function getDependentMetrics()
+    {
+        return array('goals');
+    }
+
+    public function format($value, Formatter $formatter)
+    {
+        return $formatter->getPrettyPercentFromQuotient($value);
+    }
+
+    public function compute(Row $row)
+    {
+        $mappingFromNameToIdGoal = Metrics::getMappingFromNameToIdGoal();
+
+        $goalMetrics = $this->getGoalMetrics($row);
+
+        $nbVisits = $this->getMetric($row, 'nb_visits');
+        $conversions = $this->getMetric($goalMetrics, 'nb_conversions', $mappingFromNameToIdGoal);
+
+        return Piwik::getQuotientSafe($conversions, $nbVisits, GoalManager::REVENUE_PRECISION + 2);
+    }
+}