Complex classes like Entity 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 Entity, and based on these observations, apply Extract Interface, too.
1 | <?php |
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26 | class Entity extends Generic |
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27 | { |
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28 | /** @var array Collection of all additional fields names */ |
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29 | public static $fieldNames = array(); |
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30 | |||
31 | /** @var array Collection of localized additional fields identifiers */ |
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32 | protected static $localizedFieldIDs = array(); |
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33 | |||
34 | /** @var array Collection of NOT localized additional fields identifiers */ |
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35 | protected static $notLocalizedFieldIDs = array(); |
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36 | |||
37 | /** @var array Collection of all additional fields identifiers */ |
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38 | protected static $fieldIDs = array(); |
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39 | |||
40 | /** @var @var array Collection of additional fields value column names */ |
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41 | protected static $fieldValueColumns = array(); |
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42 | |||
43 | /** @var Condition Collection of entity field filter */ |
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44 | protected $fieldFilter = array(); |
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45 | |||
46 | /** @var string Query locale */ |
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47 | protected $locale = ''; |
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48 | |||
49 | /** @var array Collection of additional fields for ordering */ |
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50 | protected $entityOrderBy = array(); |
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51 | |||
52 | /** @var array Collection of search fields for query */ |
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53 | protected $searchFilter = array(); |
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54 | |||
55 | /** |
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56 | * Select specified entity fields. |
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57 | * If this method is called then only selected entity fields |
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58 | * would be return in entity instances. |
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59 | * |
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60 | * @param mixed $fieldNames Entity field name or collection of names |
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61 | * @return $this Chaining |
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62 | */ |
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63 | public function select($fieldNames) |
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77 | |||
78 | /** |
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79 | * Set additional field for sorting. |
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80 | * |
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81 | * @param string $fieldName Additional field name |
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82 | * @param string $order Sorting order |
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83 | * @return $this Chaining |
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84 | */ |
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85 | public function orderBy($fieldName, $order = 'ASC') |
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95 | |||
96 | /** |
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97 | * Search entity fields by text. |
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98 | * |
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99 | * @param string $text Searching text |
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100 | * @return $this |
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101 | */ |
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102 | public function search($text) |
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108 | |||
109 | /** |
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110 | * Set resulting query limits. |
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111 | * |
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112 | * @param integer $offset Starting index |
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113 | * @param integer|null $count Entities count |
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114 | * @return $this Chaining |
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115 | */ |
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116 | public function limit($offset, $count = null) |
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122 | |||
123 | /** |
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124 | * Add condition to current query. |
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125 | * |
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126 | * @param string $fieldName Entity field name |
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127 | * @param string $fieldValue Value |
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128 | * @param string $fieldRelation Entity field to value relation |
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129 | * @return $this Chaining |
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130 | */ |
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131 | public function where($fieldName, $fieldValue = null, $fieldRelation = ArgumentInterface::EQUAL) |
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144 | |||
145 | /** @return array Collection of entity identifiers */ |
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146 | protected function findEntityIDs() |
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174 | |||
175 | /** |
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176 | * Get collection of entity identifiers filtered by navigation identifiers. |
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177 | * |
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178 | * @param array $entityIDs Additional collection of entity identifiers for filtering |
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179 | * @return array Collection of material identifiers by navigation identifiers |
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180 | */ |
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181 | protected function findByNavigationIDs($entityIDs = array()) |
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185 | |||
186 | /** |
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187 | * Get collection of entity identifiers filtered by additional field and its value. |
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188 | * |
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189 | * @param Condition[] $additionalFields Collection of additional field identifiers => values |
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190 | * @param array $entityIDs Additional collection of entity identifiers for filtering |
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191 | * @return array Collection of material identifiers by navigation identifiers |
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192 | */ |
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193 | protected function findByAdditionalFields($additionalFields, $entityIDs = array()) |
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213 | |||
214 | /** |
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215 | * @param array $entityIDs |
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216 | * @return array |
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217 | */ |
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218 | protected function applySearch(array $entityIDs) |
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236 | |||
237 | /** |
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238 | * Add sorting to entity identifiers. |
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239 | * |
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240 | * @param array $entityIDs |
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241 | * @param string $fieldName Additional field name for sorting |
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242 | * @param string $order Sorting order(ASC|DESC) |
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243 | * @return array Collection of entity identifiers ordered by additional field value |
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244 | */ |
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245 | protected function applySorting(array $entityIDs, $fieldName, $order = 'ASC') |
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263 | |||
264 | /** |
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265 | * Get entities additional field values. |
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266 | * |
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267 | * @param array $entityIDs Collection of entity identifiers |
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268 | * @return array Collection of entities additional fields EntityID => [Additional field name => Value] |
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269 | */ |
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270 | protected function findAdditionalFields($entityIDs) |
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332 | |||
333 | /** |
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334 | * Fill entity additional fields. |
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335 | * |
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336 | * @param Entity $entity Entity instance for filling |
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337 | * @param array $additionalFields Collection of additional field values |
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338 | * @return Entity With filled additional field values |
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339 | */ |
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340 | protected function fillEntityFields($entity, array $additionalFields) |
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356 | |||
357 | /** |
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358 | * Perform SamsonCMS query and get collection of entities. |
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359 | * |
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360 | * @param int $page Page number |
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361 | * @param int $size Page size |
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362 | * |
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363 | * @return \samsoncms\api\Entity[] Collection of entity fields |
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364 | */ |
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365 | public function find($page = null, $size = null) |
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402 | |||
403 | /** |
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404 | * Perform SamsonCMS query and get first matching entity. |
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405 | * |
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406 | * @return \samsoncms\api\Entity Firt matching entity |
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407 | */ |
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408 | public function first() |
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419 | |||
420 | /** |
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421 | * Perform SamsonCMS query and get collection of entities fields. |
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422 | * |
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423 | * @param string $fieldName Entity field name |
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424 | * @return array Collection of entity fields |
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425 | * @throws EntityFieldNotFound |
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426 | */ |
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427 | public function fields($fieldName) |
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453 | |||
454 | /** |
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455 | * Perform SamsonCMS query and get amount resulting entities. |
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456 | * |
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457 | * @return int Amount of resulting entities |
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458 | */ |
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459 | public function count() |
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469 | |||
470 | /** |
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471 | * Generic constructor. |
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472 | * |
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473 | * @param QueryInterface $query Database query instance |
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474 | * @param string $locale Query localization |
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475 | */ |
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476 | public function __construct(QueryInterface $query = null, $locale = null) |
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485 | } |
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486 |
Let’s assume that you have a directory layout like this:
and let’s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are 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.php
However, as
OtherDir/Foo.php
does 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: