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<?php
/**
* Matomo - free/libre analytics platform
*
* @link https://matomo.org
* @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*/
namespace Piwik;
/**
* The singleton base class restricts the instantiation of derived classes to one object only.
*
* All plugin APIs are singletons and thus extend this class.
*
* @api
*/
class Singleton
{
protected static $instances;
protected function __construct()
{
}
final protected function __clone()
{
}
/**
* Returns the singleton instance for the derived class. If the singleton instance
* has not been created, this method will create it.
*
* @return static
*/
public static function getInstance()
{
$class = get_called_class();
if (!isset(self::$instances[$class])) {
self::$instances[$class] = new $class();
}
return self::$instances[$class];
}
/**
* Used in tests only
* @ignore
*/
public static function unsetInstance()
{
$class = get_called_class();
unset(self::$instances[$class]);
}
/**
* Sets the singleton instance. For testing purposes.
* @ignore
*/
public static function setSingletonInstance($instance)
{
$class = get_called_class();
self::$instances[$class] = $instance;
}
/**
* @ignore
*/
public static function clearAll()
{
self::$instances = array();
}
}
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