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<?php
/**
* Piwik - free/libre analytics platform
*
* @link https://matomo.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\Columns;
use Piwik\Cache;
use Piwik\CacheId;
use Piwik\Piwik;
use Piwik\Plugin\ArchivedMetric;
use Piwik\Plugin\Metric;
use Piwik\Plugin\ProcessedMetric;
/**
* Manages the global list of metrics that can be used in reports.
*
* Metrics are added automatically by dimensions as well as through the {@hook Metric.addMetrics} and
* {@hook Metric.addComputedMetrics} and filtered through the {@hook Metric.filterMetrics} event.
* Observers for this event should call the {@link addMetric()} method to add metrics or use any of the other
* methods to remove metrics.
*
* @api since Piwik 3.2.0
*/
class MetricsList
{
/**
* List of metrics
*
* @var Metric[]
*/
private $metrics = array();
private $metricsByNameCache = array();
/**
* @param Metric $metric
*/
public function addMetric(Metric $metric)
{
$this->metrics[] = $metric;
$this->metricsByNameCache = array();
}
/**
* Get all available metrics.
*
* @return Metric[]
*/
public function getMetrics()
{
return $this->metrics;
}
/**
* Removes one or more metrics from the metrics list.
*
* @param string $metricCategory The metric category id. Can be a translation token eg 'General_Visits'
* see {@link Metric::getCategory()}.
* @param string|false $metricName The name of the metric to remove eg 'nb_visits'.
* If not supplied, all metrics within that category will be removed.
*/
public function remove($metricCategory, $metricName = false)
{
foreach ($this->metrics as $index => $metric) {
if ($metric->getCategoryId() === $metricCategory) {
if (!$metricName || $metric->getName() === $metricName) {
unset($this->metrics[$index]);
$this->metricsByNameCache = array();
}
}
}
}
/**
* @param string $metricName
* @return Metric|ArchivedMetric|null
*/
public function getMetric($metricName)
{
if (empty($this->metricsByNameCache)) {
// this method might be called quite often... eg when having heaps of goals... need to cache it
foreach ($this->metrics as $index => $metric) {
$this->metricsByNameCache[$metric->getName()] = $metric;
}
}
if (!empty($this->metricsByNameCache[$metricName])) {
return $this->metricsByNameCache[$metricName];
}
return null;
}
/**
* Get all metrics defined in the Piwik platform.
* @ignore
* @return static
*/
public static function get()
{
$cache = Cache::getTransientCache();
$cacheKey = CacheId::siteAware('MetricsList');
if ($cache->contains($cacheKey)) {
return $cache->fetch($cacheKey);
}
$list = new static;
/**
* Triggered to add new metrics that cannot be picked up automatically by the platform.
* This is useful if the plugin allows a user to create metrics dynamically. For example
* CustomDimensions or CustomVariables.
*
* **Example**
*
* public function addMetric(&$list)
* {
* $list->addMetric(new MyCustomMetric());
* }
*
* @param MetricsList $list An instance of the MetricsList. You can add metrics to the list this way.
*/
Piwik::postEvent('Metric.addMetrics', array($list));
$dimensions = Dimension::getAllDimensions();
foreach ($dimensions as $dimension) {
$factory = new DimensionMetricFactory($dimension);
$dimension->configureMetrics($list, $factory);
}
$computedFactory = new ComputedMetricFactory($list);
/**
* Triggered to add new metrics that cannot be picked up automatically by the platform.
* This is useful if the plugin allows a user to create metrics dynamically. For example
* CustomDimensions or CustomVariables.
*
* **Example**
*
* public function addMetric(&$list)
* {
* $list->addMetric(new MyCustomMetric());
* }
*
* @param MetricsList $list An instance of the MetricsList. You can add metrics to the list this way.
*/
Piwik::postEvent('Metric.addComputedMetrics', array($list, $computedFactory));
/**
* Triggered to filter metrics.
*
* **Example**
*
* public function removeMetrics(Piwik\Columns\MetricsList $list)
* {
* $list->remove($category='General_Visits'); // remove all metrics having this category
* }
*
* @param MetricsList $list An instance of the MetricsList. You can change the list of metrics this way.
*/
Piwik::postEvent('Metric.filterMetrics', array($list));
$availableMetrics = array();
foreach ($list->getMetrics() as $metric) {
$availableMetrics[] = $metric->getName();
}
foreach ($list->metrics as $index => $metric) {
if ($metric instanceof ProcessedMetric) {
$depMetrics = $metric->getDependentMetrics();
if (is_array($depMetrics)) {
foreach ($depMetrics as $depMetric) {
if (!in_array($depMetric, $availableMetrics, $strict = true)) {
unset($list->metrics[$index]); // not resolvable metric
}
}
}
}
}
$cache->save($cacheKey, $list);
return $list;
}
}
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