Complex classes like DomainAssociations 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 DomainAssociations, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
||
| 27 | class DomainAssociations extends Component |
||
| 28 | { |
||
| 29 | /** |
||
| 30 | * @event DomainAssociationEvent The event that is triggered before a domain association. |
||
| 31 | * |
||
| 32 | * You may set [[DomainAssociationEvent::isValid]] to `false` to prevent the associate action. |
||
| 33 | */ |
||
| 34 | const EVENT_BEFORE_ASSOCIATE = 'beforeAssociate'; |
||
| 35 | |||
| 36 | /** |
||
| 37 | * @event DomainAssociationEvent The event that is triggered after a domain association. |
||
| 38 | */ |
||
| 39 | const EVENT_AFTER_ASSOCIATE = 'afterAssociate'; |
||
| 40 | |||
| 41 | /** |
||
| 42 | * @event DomainAssociationEvent The event that is triggered before a domain dissociation. |
||
| 43 | * |
||
| 44 | * You may set [[DomainAssociationEvent::isValid]] to `false` to prevent the dissociate action. |
||
| 45 | */ |
||
| 46 | const EVENT_BEFORE_DISSOCIATE = 'beforeDissociate'; |
||
| 47 | |||
| 48 | /** |
||
| 49 | * @event DomainAssociationEvent The event that is triggered after a domain dissociation. |
||
| 50 | */ |
||
| 51 | const EVENT_AFTER_DISSOCIATE = 'afterDissociate'; |
||
| 52 | |||
| 53 | /** |
||
| 54 | * @param Domains $field |
||
| 55 | * @param DomainsQuery $query |
||
| 56 | * @param ElementInterface|Element $element |
||
| 57 | * @return bool |
||
| 58 | * @throws \Exception |
||
| 59 | */ |
||
| 60 | public function save( |
||
| 101 | |||
| 102 | /******************************************* |
||
| 103 | * ASSOCIATE |
||
| 104 | *******************************************/ |
||
| 105 | |||
| 106 | /** |
||
| 107 | * @param Domain $model |
||
| 108 | * @return bool |
||
| 109 | * @throws \Exception |
||
| 110 | */ |
||
| 111 | public function associate(Domain $model): bool |
||
| 167 | |||
| 168 | /******************************************* |
||
| 169 | * DISSOCIATE |
||
| 170 | *******************************************/ |
||
| 171 | |||
| 172 | /** |
||
| 173 | * @param Domain $model |
||
| 174 | * @param bool $autoReorder |
||
| 175 | * @return bool |
||
| 176 | * @throws \Exception |
||
| 177 | */ |
||
| 178 | public function dissociate( |
||
| 236 | |||
| 237 | /******************************************* |
||
| 238 | * ORDER |
||
| 239 | *******************************************/ |
||
| 240 | |||
| 241 | /** |
||
| 242 | * @param string $tableName |
||
| 243 | * @param int $elementId |
||
| 244 | * @param int $siteId |
||
| 245 | * @param array $sortOrder |
||
| 246 | * @return bool |
||
| 247 | * @throws \yii\db\Exception |
||
| 248 | */ |
||
| 249 | public function updateOrder( |
||
| 273 | |||
| 274 | /******************************************* |
||
| 275 | * INSERT / DELETE |
||
| 276 | *******************************************/ |
||
| 277 | |||
| 278 | /** |
||
| 279 | * @param string $tableName |
||
| 280 | * @param int $elementId |
||
| 281 | * @param string $domain |
||
| 282 | * @param string $status |
||
| 283 | * @param int $sortOrder |
||
| 284 | * @param int $siteId |
||
| 285 | * @return bool |
||
| 286 | * @throws \yii\db\Exception |
||
| 287 | */ |
||
| 288 | private function insertRecord( |
||
| 330 | |||
| 331 | /** |
||
| 332 | * @param string $tableName |
||
| 333 | * @param int $elementId |
||
| 334 | * @param string $domain |
||
| 335 | * @param int $siteId |
||
| 336 | * @return bool |
||
| 337 | * @throws \yii\db\Exception |
||
| 338 | */ |
||
| 339 | private function deleteRecord( |
||
| 377 | |||
| 378 | |||
| 379 | /******************************************* |
||
| 380 | * ASSOCIATE / DISSOCIATE MANY |
||
| 381 | *******************************************/ |
||
| 382 | |||
| 383 | /** |
||
| 384 | * @param ElementInterface|Element $element |
||
| 385 | * @param array $models |
||
| 386 | * @param array $currentModels |
||
| 387 | * @param array $newOrder |
||
| 388 | * @return bool |
||
| 389 | * @throws \Exception |
||
| 390 | */ |
||
| 391 | private function associateAll( |
||
| 416 | |||
| 417 | /** |
||
| 418 | * @param ElementInterface|Element $element |
||
| 419 | * @param array $models |
||
| 420 | * @return bool |
||
| 421 | * @throws \Exception |
||
| 422 | */ |
||
| 423 | private function dissociateAll( |
||
| 438 | |||
| 439 | /******************************************* |
||
| 440 | * SORT ORDER |
||
| 441 | *******************************************/ |
||
| 442 | |||
| 443 | /** |
||
| 444 | * @param Domain $model |
||
| 445 | * @return bool |
||
| 446 | * @throws \Exception |
||
| 447 | * @throws \yii\db\Exception |
||
| 448 | */ |
||
| 449 | private function applySortOrder( |
||
| 477 | |||
| 478 | /** |
||
| 479 | * @param Domain $model |
||
| 480 | * @return int |
||
| 481 | */ |
||
| 482 | private function nextSortOrder( |
||
| 495 | |||
| 496 | /** |
||
| 497 | * Re-orders so they are in sequential order |
||
| 498 | * |
||
| 499 | * @param string $tableName |
||
| 500 | * @param int $elementId |
||
| 501 | * @param int $siteId |
||
| 502 | * @return bool |
||
| 503 | * @throws \yii\db\Exception |
||
| 504 | */ |
||
| 505 | protected function autoReorder(string $tableName, int $elementId, int $siteId): bool |
||
| 523 | |||
| 524 | /** |
||
| 525 | * @param Domains $field |
||
| 526 | * @param ElementInterface|Element $element |
||
| 527 | * @return array|null |
||
| 528 | */ |
||
| 529 | protected function getCurrentDomainAssociations(Domains $field, ElementInterface $element) |
||
| 537 | |||
| 538 | /** |
||
| 539 | * @param string $tableName |
||
| 540 | * @param int $elementId |
||
| 541 | * @param int $siteId |
||
| 542 | * @return array |
||
| 543 | */ |
||
| 544 | private function currentSortOrder(string $tableName, int $elementId, int $siteId): array |
||
| 551 | |||
| 552 | /** |
||
| 553 | * @param string $tableName |
||
| 554 | * @param int $elementId |
||
| 555 | * @param int $siteId |
||
| 556 | * @return Query |
||
| 557 | */ |
||
| 558 | private function baseAssociationQuery(string $tableName, int $elementId, int $siteId): Query |
||
| 568 | |||
| 569 | /******************************************* |
||
| 570 | * UTILITIES |
||
| 571 | *******************************************/ |
||
| 572 | |||
| 573 | /** |
||
| 574 | * @param Domain $model |
||
| 575 | * @return bool |
||
| 576 | */ |
||
| 577 | private function associationExists( |
||
| 594 | |||
| 595 | /** |
||
| 596 | * @param string $tableName |
||
| 597 | * @param array $newOrder |
||
| 598 | * @param ElementInterface|Element $element |
||
| 599 | * @return bool |
||
| 600 | * @throws \yii\db\Exception |
||
| 601 | */ |
||
| 602 | private function reOrderIfChanged(string $tableName, array $newOrder, ElementInterface $element) |
||
| 616 | } |
||
| 617 |
Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: