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    <h3>Editing: ObjectLoader.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Routing\Loader;

use Symfony\Component\Config\Loader\Loader;
use Symfony\Component\Config\Resource\FileResource;
use Symfony\Component\Routing\RouteCollection;

/**
 * A route loader that calls a method on an object to load the routes.
 *
 * @author Ryan Weaver &lt;ryan@knpuniversity.com&gt;
 */
abstract class ObjectLoader extends Loader
{
    /**
     * Returns the object that the method will be called on to load routes.
     *
     * For example, if your application uses a service container,
     * the $id may be a service id.
     *
     * @return object
     */
    abstract protected function getObject(string $id);

    /**
     * Calls the object method that will load the routes.
     *
     * @param string      $resource object_id::method
     * @param string|null $type     The resource type
     *
     * @return RouteCollection
     */
    public function load($resource, ?string $type = null)
    {
        if (!preg_match('/^[^\:]+(?:::(?:[^\:]+))?$/', $resource)) {
            throw new \InvalidArgumentException(sprintf('Invalid resource &quot;%s&quot; passed to the %s route loader: use the format &quot;object_id::method&quot; or &quot;object_id&quot; if your object class has an &quot;__invoke&quot; method.', $resource, \is_string($type) ? '&quot;'.$type.'&quot;' : 'object'));
        }

        $parts = explode('::', $resource);
        $method = $parts[1] ?? '__invoke';

        $loaderObject = $this-&gt;getObject($parts[0]);

        if (!\is_object($loaderObject)) {
            throw new \TypeError(sprintf('&quot;%s:getObject()&quot; must return an object: &quot;%s&quot; returned.', static::class, get_debug_type($loaderObject)));
        }

        if (!\is_callable([$loaderObject, $method])) {
            throw new \BadMethodCallException(sprintf('Method &quot;%s&quot; not found on &quot;%s&quot; when importing routing resource &quot;%s&quot;.', $method, get_debug_type($loaderObject), $resource));
        }

        $routeCollection = $loaderObject-&gt;$method($this, $this-&gt;env);

        if (!$routeCollection instanceof RouteCollection) {
            $type = get_debug_type($routeCollection);

            throw new \LogicException(sprintf('The &quot;%s::%s()&quot; method must return a RouteCollection: &quot;%s&quot; returned.', get_debug_type($loaderObject), $method, $type));
        }

        // make the object file tracked so that if it changes, the cache rebuilds
        $this-&gt;addClassResource(new \ReflectionClass($loaderObject), $routeCollection);

        return $routeCollection;
    }

    private function addClassResource(\ReflectionClass $class, RouteCollection $collection)
    {
        do {
            if (is_file($class-&gt;getFileName())) {
                $collection-&gt;addResource(new FileResource($class-&gt;getFileName()));
            }
        } while ($class = $class-&gt;getParentClass());
    }
}
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