AbstractMachine.php

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<?php
declare(strict_types=1);

namespace ILIAS\ResourceStorage\Flavour\Machine\DefaultMachines;

use ILIAS\ResourceStorage\Flavour\Engine\Engine;
use ILIAS\ResourceStorage\Flavour\Machine\FlavourMachine;

abstract class AbstractMachine implements FlavourMachine
{
    protected ?Engine $engine = null;

    public function __construct()
    {
    }

    public function withEngine(Engine $engine): FlavourMachine
    {
        $clone = clone $this;
        $clone->engine = $engine;
        return $clone;
    }

    public function getEngine(): Engine
    {
        if ($this->engine === null) {
            throw new \OutOfBoundsException("Engine not available");
        }
        return $this->engine;
    }
}