Application.php

<?php

namespace DesignPatterns\Creational\FactoryMethod;

/**
 * Application abstract base class. Defines a framework for concrete applications.
 *
 * It corresponds to `Creator` in the Factory Method pattern.
 *
 * @author Vlad Riabchenko <contact@vria.eu>
 */
abstract class Application
{
    /**
     * This is the factory method.
     *
     * @return RouterInterface
     */
    public abstract function createRouter();

    /**
     * This is another factory method.
     *
     * @param $requestURL
     *
     * @return RequestInterface
     */
    public abstract function createRequest($requestURL);

    /**
     * @param $requestURL
     *
     * @return string
     */
    public function handle($requestURL)
    {
        $request = $this->createRequest($requestURL);
        $router = $this->createRouter();
        $handler = $router->resolveHandler($request);

        return call_user_func($handler, $request);
    }
}