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system/Exceptions/PageNotFoundException.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Exceptions;
+
+use Config\Services;
+use OutOfBoundsException;
+
+class PageNotFoundException extends OutOfBoundsException implements ExceptionInterface
+{
+    use DebugTraceableTrait;
+
+    /**
+     * Error code
+     *
+     * @var int
+     */
+    protected $code = 404;
+
+    public static function forPageNotFound(?string $message = null)
+    {
+        return new static($message ?? self::lang('HTTP.pageNotFound'));
+    }
+
+    public static function forEmptyController()
+    {
+        return new static(self::lang('HTTP.emptyController'));
+    }
+
+    public static function forControllerNotFound(string $controller, string $method)
+    {
+        return new static(self::lang('HTTP.controllerNotFound', [$controller, $method]));
+    }
+
+    public static function forMethodNotFound(string $method)
+    {
+        return new static(self::lang('HTTP.methodNotFound', [$method]));
+    }
+
+    /**
+     * Get translated system message
+     *
+     * Use a non-shared Language instance in the Services.
+     * If a shared instance is created, the Language will
+     * have the current locale, so even if users call
+     * `$this->request->setLocale()` in the controller afterwards,
+     * the Language locale will not be changed.
+     */
+    private static function lang(string $line, array $args = []): string
+    {
+        $lang = Services::language(null, false);
+
+        return $lang->getLine($line, $args);
+    }
+}