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<?php
/**
* Matomo - free/libre analytics platform
*
* @link https://matomo.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik;
use Exception;
/**
* Base class for all factory types.
*
* Factory types are base classes that contain a **factory** method. This method is used to instantiate
* concrete instances by a specified string ID. Fatal errors do not occur if a class does not exist.
* Instead an exception is thrown.
*
* Derived classes should override the **getClassNameFromClassId** and **getInvalidClassIdExceptionMessage**
* static methods.
*/
abstract class BaseFactory
{
/**
* Creates a new instance of a class using a string ID.
*
* @param string $classId The ID of the class.
* @return \Piwik\DataTable\Renderer
* @throws Exception if $classId is invalid.
*/
public static function factory($classId)
{
$className = static::getClassNameFromClassId($classId);
if (!class_exists($className)) {
self::sendPlainHeader();
throw new Exception(static::getInvalidClassIdExceptionMessage($classId));
}
return new $className;
}
private static function sendPlainHeader()
{
Common::sendHeader('Content-Type: text/plain; charset=utf-8');
}
/**
* Should return a class name based on the class's associated string ID.
*/
protected static function getClassNameFromClassId($id)
{
return $id;
}
/**
* Should return a message to use in an Exception when an invalid class ID is supplied to
* {@link factory()}.
*/
protected static function getInvalidClassIdExceptionMessage($id)
{
return "Invalid class ID '$id' for " . get_called_class() . "::factory().";
}
}
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