AbstractMiddleware.php

<?php declare(strict_types=1);
/**
 * Part of Windwalker project.
 *
 * @copyright  Copyright (C) 2019 LYRASOFT.
 * @license    LGPL-2.0-or-later
 */

namespace Windwalker\Middleware;

/**
 * Basic Middleware class.
 *
 * @since 2.0
 */
abstract class AbstractMiddleware implements MiddlewareInterface
{
    /**
     * THe next middleware.
     *
     * @var  mixed|MiddlewareInterface
     */
    protected $next = null;

    /**
     * Get next middleware.
     *
     * @return  mixed|MiddlewareInterface
     */
    public function getNext()
    {
        return $this->next;
    }

    /**
     * Set next middleware.
     *
     * @param   callable|MiddlewareInterface $callable The middleware object.
     *
     * @return  static  Return self to support chaining.
     */
    public function setNext($callable)
    {
        if (!($callable instanceof MiddlewareInterface) && is_callable($callable)) {
            $callable = new CallbackMiddleware($callable);
        }

        $this->next = $callable;

        return $this;
    }
}