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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 $className();
    }
    private static function sendPlainHeader()
    {
        \Piwik\Common::sendHeader('Content-Type: text/plain; charset=utf-8');
    }
    /**
     * Should return a class name based on the class's associated string ID.
     */
    protected static function getClassNameFromClassId($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().";
    }
}