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vendor/symfony/routing/Loader/Configurator/RouteConfigurator.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Routing\Loader\Configurator;
+
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class RouteConfigurator
+{
+    use Traits\AddTrait;
+    use Traits\HostTrait;
+    use Traits\RouteTrait;
+
+    protected $parentConfigurator;
+
+    public function __construct(RouteCollection $collection, RouteCollection $route, string $name = '', ?CollectionConfigurator $parentConfigurator = null, ?array $prefixes = null)
+    {
+        $this->collection = $collection;
+        $this->route = $route;
+        $this->name = $name;
+        $this->parentConfigurator = $parentConfigurator; // for GC control
+        $this->prefixes = $prefixes;
+    }
+
+    /**
+     * Sets the host to use for all child routes.
+     *
+     * @param string|array $host the host, or the localized hosts
+     *
+     * @return $this
+     */
+    final public function host(string|array $host): static
+    {
+        $this->addHost($this->route, $host);
+
+        return $this;
+    }
+}