LazyRouteCollection.php

<?php

namespace Drupal\Core\Routing;

use Symfony\Component\Routing\Exception\RouteNotFoundException;
use Symfony\Component\Routing\RouteCollection;
class LazyRouteCollection extends RouteCollection {
    
    /**
     * The route provider for this generator.
     *
     * @var \Drupal\Core\Routing\RouteProviderInterface
     */
    protected $provider;
    
    /**
     * Constructs a LazyRouteCollection.
     */
    public function __construct(RouteProviderInterface $provider) {
        $this->provider = $provider;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIterator() : \ArrayIterator {
        return new \ArrayIterator($this->all());
    }
    
    /**
     * Gets the number of Routes in this collection.
     *
     * @return int
     *   The number of routes
     */
    public function count() {
        return count($this->all());
    }
    
    /**
     * Returns all routes in this collection.
     *
     * @return \Symfony\Component\Routing\Route[]
     *   An array of routes
     */
    public function all() {
        return $this->provider
            ->getRoutesByNames(NULL);
    }
    
    /**
     * Gets a route by name.
     *
     * @param string $name
     *   The route name
     *
     * @return \Symfony\Component\Routing\Route|null
     *   A Route instance or null when not found
     */
    public function get($name) {
        try {
            return $this->provider
                ->getRouteByName($name);
        } catch (RouteNotFoundException $e) {
            return;
        }
    }

}