Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like admin_controller 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 admin_controller, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 18 | class admin_controller |
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| 19 | { |
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| 20 | /** @var array|bool Form data */ |
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| 21 | protected $data = false; |
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| 22 | |||
| 23 | /** @var \phpbb\template\template */ |
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| 24 | protected $template; |
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| 25 | |||
| 26 | /** @var \phpbb\language\language */ |
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| 27 | protected $language; |
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| 28 | |||
| 29 | /** @var \phpbb\request\request */ |
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| 30 | protected $request; |
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| 31 | |||
| 32 | /** @var \phpbb\ads\ad\manager */ |
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| 33 | protected $manager; |
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| 34 | |||
| 35 | /** @var \phpbb\config\db_text */ |
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| 36 | protected $config_text; |
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| 37 | |||
| 38 | /** @var \phpbb\config\config */ |
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| 39 | protected $config; |
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| 40 | |||
| 41 | /** @var \phpbb\group\helper */ |
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| 42 | protected $group_helper; |
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| 43 | |||
| 44 | /** @var \phpbb\ads\controller\admin_input */ |
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| 45 | protected $input; |
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| 46 | |||
| 47 | /** @var \phpbb\ads\controller\admin_helper */ |
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| 48 | protected $helper; |
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| 49 | |||
| 50 | /** @var \phpbb\ads\analyser\manager */ |
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| 51 | protected $analyser; |
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| 52 | |||
| 53 | /** @var string Custom form action */ |
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| 54 | protected $u_action; |
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| 55 | |||
| 56 | /** |
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| 57 | * Constructor |
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| 58 | * |
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| 59 | * @param \phpbb\template\template $template Template object |
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| 60 | * @param \phpbb\language\language $language Language object |
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| 61 | * @param \phpbb\request\request $request Request object |
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| 62 | * @param \phpbb\ads\ad\manager $manager Advertisement manager object |
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| 63 | * @param \phpbb\config\db_text $config_text Config text object |
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| 64 | * @param \phpbb\config\config $config Config object |
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| 65 | * @param \phpbb\group\helper $group_helper Group helper object |
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| 66 | * @param \phpbb\ads\controller\admin_input $input Admin input object |
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| 67 | * @param \phpbb\ads\controller\admin_helper $helper Admin helper object |
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| 68 | * @param \phpbb\ads\analyser\manager $analyser Ad code analyser object |
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| 69 | * @param string $root_path phpBB root path |
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| 70 | * @param string $php_ext PHP extension |
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| 71 | */ |
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| 72 | 33 | public function __construct(\phpbb\template\template $template, \phpbb\language\language $language, \phpbb\request\request $request, \phpbb\ads\ad\manager $manager, \phpbb\config\db_text $config_text, \phpbb\config\config $config, \phpbb\group\helper $group_helper, \phpbb\ads\controller\admin_input $input, \phpbb\ads\controller\admin_helper $helper, \phpbb\ads\analyser\manager $analyser, $root_path, $php_ext) |
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| 95 | |||
| 96 | /** |
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| 97 | * Set page url |
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| 98 | * |
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| 99 | * @param string $u_action Custom form action |
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| 100 | * @return void |
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| 101 | */ |
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| 102 | 27 | public function set_page_url($u_action) |
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| 106 | |||
| 107 | /** |
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| 108 | * Get ACP page title for Ads module |
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| 109 | * |
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| 110 | * @return string Language string for Ads ACP module |
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| 111 | */ |
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| 112 | 1 | public function get_page_title() |
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| 116 | |||
| 117 | /** |
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| 118 | * Process user request for settings mode |
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| 119 | * |
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| 120 | * @return void |
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| 121 | */ |
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| 122 | 3 | public function mode_settings() |
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| 158 | |||
| 159 | /** |
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| 160 | * Process user request for manage mode |
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| 161 | * |
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| 162 | * @return void |
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| 163 | */ |
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| 164 | 29 | public function mode_manage() |
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| 178 | |||
| 179 | /** |
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| 180 | * Add an advertisement |
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| 181 | * |
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| 182 | * @return void |
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| 183 | */ |
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| 184 | 12 | protected function action_add() |
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| 207 | |||
| 208 | /** |
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| 209 | * Edit an advertisement |
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| 210 | * |
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| 211 | * @return void |
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| 212 | */ |
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| 213 | 7 | protected function action_edit() |
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| 244 | |||
| 245 | /** |
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| 246 | * Enable an advertisement |
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| 247 | * |
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| 248 | * @return void |
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| 249 | */ |
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| 250 | 4 | protected function action_enable() |
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| 254 | |||
| 255 | /** |
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| 256 | * Disable an advertisement |
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| 257 | * |
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| 258 | * @return void |
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| 259 | */ |
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| 260 | 4 | protected function action_disable() |
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| 264 | |||
| 265 | /** |
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| 266 | * Delete an advertisement |
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| 267 | * |
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| 268 | * @return void |
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| 269 | */ |
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| 270 | 3 | protected function action_delete() |
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| 310 | |||
| 311 | /** |
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| 312 | * Display the list of all ads |
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| 313 | * |
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| 314 | * @return void |
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| 315 | */ |
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| 316 | 1 | protected function list_ads() |
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| 352 | |||
| 353 | /** |
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| 354 | * Get what action user wants to do with the form. |
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| 355 | * Possible options are: |
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| 356 | * - preview ad code |
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| 357 | * - upload banner to display in an ad code |
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| 358 | * - analyse ad code |
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| 359 | * - submit form (either add or edit an ad) |
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| 360 | * |
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| 361 | * @return mixed Action name or false when no action was submitted |
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| 362 | */ |
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| 363 | 13 | protected function get_submitted_action() |
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| 376 | |||
| 377 | /** |
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| 378 | * Enable/disable an advertisement |
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| 379 | * |
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| 380 | * @param bool $enable Enable or disable the advertisement? |
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| 381 | * @return void |
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| 382 | */ |
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| 383 | 6 | protected function ad_enable($enable) |
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| 411 | |||
| 412 | /** |
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| 413 | * Submit action "preview". |
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| 414 | * Prepare advertisement preview. |
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| 415 | * |
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| 416 | * @return void |
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| 417 | */ |
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| 418 | 2 | protected function preview() |
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| 422 | |||
| 423 | /** |
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| 424 | * Submit action "upload_banner". |
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| 425 | * Upload banner and append it to the ad code. |
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| 426 | * |
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| 427 | * @return void |
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| 428 | */ |
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| 429 | 1 | protected function upload_banner() |
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| 433 | |||
| 434 | /** |
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| 435 | * Submit action "analyse_ad_code". |
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| 436 | * Upload banner and append it to the ad code. |
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| 437 | * |
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| 438 | * @return void |
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| 439 | */ |
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| 440 | 1 | protected function analyse_ad_code() |
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| 444 | |||
| 445 | /** |
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| 446 | * Submit action "submit_add". |
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| 447 | * Add new ad. |
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| 448 | * |
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| 449 | * @return void |
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| 450 | */ |
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| 451 | 2 | protected function submit_add() |
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| 463 | |||
| 464 | /** |
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| 465 | * Submit action "submit_edit". |
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| 466 | * Edit ad. |
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| 467 | * |
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| 468 | * @return void |
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| 469 | */ |
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| 470 | 4 | protected function submit_edit() |
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| 490 | |||
| 491 | /** |
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| 492 | * Print success message. |
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| 493 | * |
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| 494 | * @param string $msg Message lang key |
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| 495 | */ |
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| 496 | 6 | protected function success($msg) |
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| 500 | |||
| 501 | /** |
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| 502 | * Print error message. |
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| 503 | * |
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| 504 | * @param string $msg Message lang key |
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| 505 | */ |
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| 506 | 6 | protected function error($msg) |
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| 510 | } |
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| 511 |
If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check:
If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue.