Complex classes like Router often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Router, and based on these observations, apply Extract Interface, too.
| 1 | <?php | ||
| 15 | class Router implements ContainerInjectableInterface | ||
| 16 | { | ||
| 17 | use ContainerInjectableTrait; | ||
| 18 | |||
| 19 | |||
| 20 | |||
| 21 | /** | ||
| 22 | * @var array $routes all the routes. | ||
| 23 | * @var array $internalRoutes all internal routes. | ||
| 24 | * @var Route $lastRoute last route that was matched and called. | ||
| 25 | */ | ||
| 26 | private $routes = []; | ||
| 27 | private $internalRoutes = []; | ||
| 28 | private $lastRoute = null; | ||
| 29 | |||
| 30 | |||
| 31 | |||
| 32 | /** | ||
| 33 | * @const DEVELOPMENT Verbose with exceptions. | ||
| 34 | * @const PRODUCTION Exceptions turns into 500. | ||
| 35 | */ | ||
| 36 | const DEVELOPMENT = 0; | ||
| 37 | const PRODUCTION = 1; | ||
| 38 | |||
| 39 | |||
| 40 | |||
| 41 | /** | ||
| 42 | * @var integer $mode current mode. | ||
| 43 | */ | ||
| 44 | private $mode = self::DEVELOPMENT; | ||
| 45 | |||
| 46 | |||
| 47 | |||
| 48 | /** | ||
| 49 | * Set Router::DEVELOPMENT or Router::PRODUCTION mode. | ||
| 50 | * | ||
| 51 | * @param integer $mode which mode to set. | ||
| 52 | * | ||
| 53 | * @return self to enable chaining. | ||
| 54 | */ | ||
| 55 | 1 | public function setMode($mode) : object | |
| 60 | |||
| 61 | |||
| 62 | |||
| 63 | /** | ||
| 64 | * Add routes from an array where the array looks like this: | ||
| 65 | * [ | ||
| 66 | * "mount" => null|string, // Where to mount the routes | ||
| 67 | * "routes" => [ // All routes in this array | ||
| 68 | * [ | ||
| 69 | * "info" => "Just say hi.", | ||
| 70 | * "method" => null, | ||
| 71 | * "path" => "hi", | ||
| 72 |      *              "handler" => function () { | ||
| 73 | * return "Hi."; | ||
| 74 | * }, | ||
| 75 | * ] | ||
| 76 | * ] | ||
| 77 | * ] | ||
| 78 | * | ||
| 79 | * @throws ConfigurationException | ||
| 80 | * | ||
| 81 | * @param array $routes containing the routes to add. | ||
| 82 | * | ||
| 83 | * @return self to enable chaining. | ||
| 84 | */ | ||
| 85 | 5 | public function addRoutes(array $routes) : object | |
| 121 | |||
| 122 | |||
| 123 | |||
| 124 | /** | ||
| 125 | * Prepare the mount string from configuration, use $mount1 or $mount2, | ||
| 126 | * the latter supersedes the first. | ||
| 127 | * | ||
| 128 | * @param string $mount1 first suggestion to mount path. | ||
| 129 | * @param string $mount2 second suggestion to mount path, ovverides | ||
| 130 | * the first. | ||
| 131 | * | ||
| 132 | * @return string|null as mount path. | ||
| 133 | */ | ||
| 134 | 2 | public function createMountPath( | |
| 153 | |||
| 154 | |||
| 155 | |||
| 156 | /** | ||
| 157 | * Add a route with a request method, a path rule to match and an action | ||
| 158 | * as the callback. Adding several path rules (array) results in several | ||
| 159 | * routes being created. | ||
| 160 | * | ||
| 161 | * @param string|array $method as request method to support | ||
| 162 | * @param string $mount prefix to $path | ||
| 163 | * @param string|array $path for this route, array for several | ||
| 164 | * paths | ||
| 165 | * @param string|array|callable $handler for this path, callable or equal | ||
| 166 | * @param string $info description of the route | ||
| 167 | * | ||
| 168 | * @return void. | ||
| 169 | */ | ||
| 170 | 92 | public function addRoute( | |
| 187 | |||
| 188 | |||
| 189 | |||
| 190 | /** | ||
| 191 | * Add an internal route to the router, this route is not exposed to the | ||
| 192 | * browser and the end user. | ||
| 193 | * | ||
| 194 | * @param string $path for this route | ||
| 195 | * @param string|array|callable $handler for this path, callable or equal | ||
| 196 | * @param string $info description of the route | ||
| 197 | * | ||
| 198 | * @return void. | ||
| 199 | */ | ||
| 200 | 12 | public function addInternalRoute( | |
| 209 | |||
| 210 | |||
| 211 | |||
| 212 | /** | ||
| 213 | * Handle the routes and match them towards the request, dispatch them | ||
| 214 | * when a match is made. Each route handler may throw exceptions that | ||
| 215 | * may redirect to an internal route for error handling. | ||
| 216 | * Several routes can match and if the routehandler does not break | ||
| 217 | * execution flow, the route matching will carry on. | ||
| 218 | * Only the last routehandler will get its return value returned further. | ||
| 219 | * | ||
| 220 | * @param string $path the path to find a matching handler for. | ||
| 221 | * @param string $method the request method to match. | ||
| 222 | * | ||
| 223 | * @return mixed content returned from route. | ||
| 224 | */ | ||
| 225 | 92 | public function handle($path, $method = null) | |
| 226 |     { | ||
| 227 |         try { | ||
| 228 | 92 | $match = false; | |
| 229 | 92 |             foreach ($this->routes as $route) { | |
| 230 | 91 |                 if ($route->match($path, $method)) { | |
| 231 | 90 | $this->lastRoute = $route; | |
| 232 | 90 | $match = true; | |
| 233 | 90 | $results = $route->handle($path, $this->di); | |
| 234 | 83 |                     if ($results) { | |
| 235 | 84 | return $results; | |
| 236 | } | ||
| 237 | } | ||
| 238 | } | ||
| 239 | |||
| 240 | 4 |             return $this->handleInternal("404"); | |
| 241 | 7 |         } catch (ForbiddenException $e) { | |
| 242 | 2 |             return $this->handleInternal("403"); | |
| 243 | 5 |         } catch (NotFoundException $e) { | |
| 244 | 1 |             return $this->handleInternal("404"); | |
| 245 | 4 |         } catch (InternalErrorException $e) { | |
| 246 | 2 |             return $this->handleInternal("500"); | |
| 247 | 2 |         } catch (\Exception $e) { | |
| 248 | 2 |             if ($this->mode === Router::DEVELOPMENT) { | |
| 249 | 1 | throw $e; | |
| 250 | } | ||
| 251 | 1 |             return $this->handleInternal("500"); | |
| 252 | } | ||
| 253 | } | ||
| 254 | |||
| 255 | |||
| 256 | |||
| 257 | /** | ||
| 258 | * Handle an internal route, the internal routes are not exposed to the | ||
| 259 | * end user. | ||
| 260 | * | ||
| 261 | * @param string $path for this route. | ||
| 262 | * | ||
| 263 | * @throws \Anax\Route\Exception\NotFoundException | ||
| 264 | * | ||
| 265 | * @return void | ||
| 266 | */ | ||
| 267 | 11 | public function handleInternal($path) | |
| 276 | |||
| 277 | |||
| 278 | |||
| 279 | /** | ||
| 280 | * Add a route having a controller as a handler. | ||
| 281 | * | ||
| 282 | * @param string|array $method as request method to support | ||
| 283 | * @param string|array $mount for this route. | ||
| 284 | * @param string|callable $handler a callback handler for the route. | ||
| 285 | * @param string $info description of the route | ||
| 286 | * | ||
| 287 | * @return void. | ||
| 288 | */ | ||
| 289 | 6 | public function addController($method = null, $mount = null, $handler = null, $info = null) | |
| 293 | |||
| 294 | |||
| 295 | |||
| 296 | /** | ||
| 297 | * Add a route to the router by its method(s), path(s) and a callback. | ||
| 298 | * | ||
| 299 | * @param string|array $method as request method to support | ||
| 300 | * @param string|array $path for this route. | ||
| 301 | * @param string|callable $handler a callback handler for the route. | ||
| 302 | * @param string $info description of the route | ||
| 303 | * | ||
| 304 | * @return void. | ||
| 305 | */ | ||
| 306 | 12 | public function any($method = null, $path = null, $handler = null, $info = null) | |
| 310 | |||
| 311 | |||
| 312 | |||
| 313 | /** | ||
| 314 | * Add a route to the router by its path(s) and a callback for any | ||
| 315 | * request method . | ||
| 316 | * | ||
| 317 | * @param string|array $path for this route. | ||
| 318 | * @param string|callable $handler a callback handler for the route. | ||
| 319 | * @param string $info description of the route | ||
| 320 | * | ||
| 321 | * @return void | ||
| 322 | */ | ||
| 323 | 20 | public function add($path = null, $handler = null, $info = null) | |
| 327 | |||
| 328 | |||
| 329 | |||
| 330 | /** | ||
| 331 | * Add a default route which will be applied for any path and any | ||
| 332 | * request method. | ||
| 333 | * | ||
| 334 | * @param string|callable $handler a callback handler for the route. | ||
| 335 | * @param string $info description of the route | ||
| 336 | * | ||
| 337 | * @return void | ||
| 338 | */ | ||
| 339 | 48 | public function always($handler, $info = null) | |
| 343 | |||
| 344 | |||
| 345 | |||
| 346 | /** | ||
| 347 | * Add a default route which will be applied for any path, if the choosen | ||
| 348 | * request method is matching. | ||
| 349 | * | ||
| 350 | * @param string|array $method as request method to support | ||
| 351 | * @param string|callable $handler a callback handler for the route. | ||
| 352 | * @param string $info description of the route | ||
| 353 | * | ||
| 354 | * @return void | ||
| 355 | */ | ||
| 356 | 7 | public function all($method, $handler, $info = null) | |
| 360 | |||
| 361 | |||
| 362 | |||
| 363 | /** | ||
| 364 | * Shortcut to add a GET route for the http request method GET. | ||
| 365 | * | ||
| 366 | * @param string|array $path for this route. | ||
| 367 | * @param string|callable $handler a callback handler for the route. | ||
| 368 | * @param string $info description of the route | ||
| 369 | * | ||
| 370 | * @return void | ||
| 371 | */ | ||
| 372 | 6 | public function get($path, $handler, $info = null) | |
| 376 | |||
| 377 | |||
| 378 | |||
| 379 | /** | ||
| 380 | * Shortcut to add a POST route for the http request method POST. | ||
| 381 | * | ||
| 382 | * @param string|array $path for this route. | ||
| 383 | * @param string|callable $handler a callback handler for the route. | ||
| 384 | * @param string $info description of the route | ||
| 385 | * | ||
| 386 | * @return void | ||
| 387 | */ | ||
| 388 | 6 | public function post($path, $handler, $info = null) | |
| 392 | |||
| 393 | |||
| 394 | |||
| 395 | /** | ||
| 396 | * Shortcut to add a PUT route for the http request method PUT. | ||
| 397 | * | ||
| 398 | * @param string|array $path for this route. | ||
| 399 | * @param string|callable $handler a callback handler for the route. | ||
| 400 | * @param string $info description of the route | ||
| 401 | * | ||
| 402 | * @return void | ||
| 403 | */ | ||
| 404 | 6 | public function put($path, $handler, $info = null) | |
| 408 | |||
| 409 | |||
| 410 | |||
| 411 | /** | ||
| 412 | * Shortcut to add a PATCH route for the http request method PATCH. | ||
| 413 | * | ||
| 414 | * @param string|array $path for this route. | ||
| 415 | * @param string|callable $handler a callback handler for the route. | ||
| 416 | * @param string $info description of the route | ||
| 417 | * | ||
| 418 | * @return void | ||
| 419 | */ | ||
| 420 | 6 | public function patch($path, $handler, $info = null) | |
| 424 | |||
| 425 | |||
| 426 | |||
| 427 | /** | ||
| 428 | * Shortcut to add a DELETE route for the http request method DELETE. | ||
| 429 | * | ||
| 430 | * @param string|array $path for this route. | ||
| 431 | * @param string|callable $handler a callback handler for the route. | ||
| 432 | * @param string $info description of the route | ||
| 433 | * | ||
| 434 | * @return void | ||
| 435 | */ | ||
| 436 | 6 | public function delete($path, $handler, $info = null) | |
| 440 | |||
| 441 | |||
| 442 | |||
| 443 | /** | ||
| 444 | * Shortcut to add a OPTIONS route for the http request method OPTIONS. | ||
| 445 | * | ||
| 446 | * @param string|array $path for this route. | ||
| 447 | * @param string|callable $handler a callback handler for the route. | ||
| 448 | * @param string $info description of the route | ||
| 449 | * | ||
| 450 | * @return void | ||
| 451 | */ | ||
| 452 | 6 | public function options($path, $handler, $info = null) | |
| 456 | |||
| 457 | |||
| 458 | |||
| 459 | /** | ||
| 460 | * Get the route for the last route that was handled. | ||
| 461 | * | ||
| 462 | * @return mixed | ||
| 463 | */ | ||
| 464 | 4 | public function getLastRoute() | |
| 468 | |||
| 469 | |||
| 470 | |||
| 471 | /** | ||
| 472 | * Get the route for the last route that was handled. | ||
| 473 | * | ||
| 474 | * @return mixed | ||
| 475 | */ | ||
| 476 | 3 | public function getMatchedPath() | |
| 480 | |||
| 481 | |||
| 482 | |||
| 483 | /** | ||
| 484 | * Get all routes. | ||
| 485 | * | ||
| 486 | * @return array with all routes. | ||
| 487 | */ | ||
| 488 | 78 | public function getAll() | |
| 492 | |||
| 493 | |||
| 494 | |||
| 495 | /** | ||
| 496 | * Get all internal routes. | ||
| 497 | * | ||
| 498 | * @return array with internal routes. | ||
| 499 | */ | ||
| 500 | 5 | public function getInternal() | |
| 504 | } | ||
| 505 | 
In PHP, under loose comparison (like
==, or!=, orswitchconditions), values of different types might be equal.For
stringvalues, the empty string''is a special case, in particular the following results might be unexpected: