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vendor/symfony/console/CommandLoader/FactoryCommandLoader.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\Console\CommandLoader;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
+
+/**
+ * A simple command loader using factories to instantiate commands lazily.
+ *
+ * @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
+ */
+class FactoryCommandLoader implements CommandLoaderInterface
+{
+    private array $factories;
+
+    /**
+     * @param callable[] $factories Indexed by command names
+     */
+    public function __construct(array $factories)
+    {
+        $this->factories = $factories;
+    }
+
+    public function has(string $name): bool
+    {
+        return isset($this->factories[$name]);
+    }
+
+    public function get(string $name): Command
+    {
+        if (!isset($this->factories[$name])) {
+            throw new CommandNotFoundException(sprintf('Command "%s" does not exist.', $name));
+        }
+
+        $factory = $this->factories[$name];
+
+        return $factory();
+    }
+
+    public function getNames(): array
+    {
+        return array_keys($this->factories);
+    }
+}