doctrine /
orm
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 PersistentCollection 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 PersistentCollection, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 44 | final class PersistentCollection extends AbstractLazyCollection implements Selectable |
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| 45 | { |
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| 46 | /** |
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| 47 | * A snapshot of the collection at the moment it was fetched from the database. |
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| 48 | * This is used to create a diff of the collection at commit time. |
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| 49 | * |
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| 50 | * @var array |
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| 51 | */ |
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| 52 | private $snapshot = []; |
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| 53 | |||
| 54 | /** |
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| 55 | * The entity that owns this collection. |
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| 56 | * |
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| 57 | * @var object |
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| 58 | */ |
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| 59 | private $owner; |
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| 60 | |||
| 61 | /** |
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| 62 | * The association mapping the collection belongs to. |
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| 63 | * This is currently either a OneToManyMapping or a ManyToManyMapping. |
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| 64 | * |
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| 65 | * @var array |
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| 66 | */ |
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| 67 | private $association; |
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| 68 | |||
| 69 | /** |
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| 70 | * The EntityManager that manages the persistence of the collection. |
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| 71 | * |
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| 72 | * @var \Doctrine\ORM\EntityManagerInterface |
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| 73 | */ |
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| 74 | private $em; |
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| 75 | |||
| 76 | /** |
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| 77 | * The name of the field on the target entities that points to the owner |
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| 78 | * of the collection. This is only set if the association is bi-directional. |
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| 79 | * |
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| 80 | * @var string |
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| 81 | */ |
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| 82 | private $backRefFieldName; |
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| 83 | |||
| 84 | /** |
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| 85 | * The class descriptor of the collection's entity type. |
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| 86 | * |
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| 87 | * @var ClassMetadata |
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| 88 | */ |
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| 89 | private $typeClass; |
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| 90 | |||
| 91 | /** |
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| 92 | * Whether the collection is dirty and needs to be synchronized with the database |
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| 93 | * when the UnitOfWork that manages its persistent state commits. |
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| 94 | * |
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| 95 | * @var boolean |
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| 96 | */ |
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| 97 | private $isDirty = false; |
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| 98 | |||
| 99 | /** |
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| 100 | * Creates a new persistent collection. |
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| 101 | * |
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| 102 | * @param EntityManagerInterface $em The EntityManager the collection will be associated with. |
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| 103 | * @param ClassMetadata $class The class descriptor of the entity type of this collection. |
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| 104 | * @param Collection $collection The collection elements. |
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| 105 | */ |
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| 106 | 890 | public function __construct(EntityManagerInterface $em, $class, Collection $collection) |
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| 113 | |||
| 114 | /** |
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| 115 | * INTERNAL: |
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| 116 | * Sets the collection's owning entity together with the AssociationMapping that |
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| 117 | * describes the association between the owner and the elements of the collection. |
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| 118 | * |
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| 119 | * @param object $entity |
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| 120 | * @param array $assoc |
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| 121 | * |
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| 122 | * @return void |
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| 123 | */ |
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| 124 | 884 | public function setOwner($entity, array $assoc) |
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| 130 | |||
| 131 | /** |
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| 132 | * INTERNAL: |
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| 133 | * Gets the collection owner. |
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| 134 | * |
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| 135 | * @return object |
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| 136 | */ |
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| 137 | 526 | public function getOwner() |
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| 141 | |||
| 142 | /** |
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| 143 | * @return Mapping\ClassMetadata |
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| 144 | */ |
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| 145 | 21 | public function getTypeClass() |
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| 149 | |||
| 150 | /** |
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| 151 | * INTERNAL: |
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| 152 | * Adds an element to a collection during hydration. This will automatically |
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| 153 | * complete bidirectional associations in the case of a one-to-many association. |
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| 154 | * |
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| 155 | * @param mixed $element The element to add. |
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| 156 | * |
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| 157 | * @return void |
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| 158 | */ |
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| 159 | 158 | View Code Duplication | public function hydrateAdd($element) |
| 167 | |||
| 168 | /** |
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| 169 | * Sets the owner on the inverse side of the association, when the property was not set yet |
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| 170 | * |
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| 171 | * @param mixed $element |
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| 172 | */ |
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| 173 | 114 | private function completeBidirectionalAssociationLink($element) : void |
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| 189 | |||
| 190 | /** |
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| 191 | * INTERNAL: |
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| 192 | * Sets a keyed element in the collection during hydration. |
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| 193 | * |
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| 194 | * @param mixed $key The key to set. |
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| 195 | * @param mixed $element The element to set. |
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| 196 | * |
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| 197 | * @return void |
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| 198 | */ |
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| 199 | 39 | View Code Duplication | public function hydrateSet($key, $element) |
| 207 | |||
| 208 | /** |
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| 209 | * Initializes the collection by loading its contents from the database |
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| 210 | * if the collection is not yet initialized. |
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| 211 | * |
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| 212 | * @return void |
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| 213 | */ |
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| 214 | 767 | public function initialize() |
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| 224 | |||
| 225 | /** |
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| 226 | * INTERNAL: |
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| 227 | * Tells this collection to take a snapshot of its current state. |
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| 228 | * |
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| 229 | * @return void |
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| 230 | */ |
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| 231 | 588 | public function takeSnapshot() |
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| 236 | |||
| 237 | /** |
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| 238 | * INTERNAL: |
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| 239 | * Returns the last snapshot of the elements in the collection. |
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| 240 | * |
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| 241 | * @return array The last snapshot of the elements. |
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| 242 | */ |
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| 243 | 24 | public function getSnapshot() |
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| 247 | |||
| 248 | /** |
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| 249 | * INTERNAL: |
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| 250 | * getDeleteDiff |
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| 251 | * |
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| 252 | * @return array |
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| 253 | */ |
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| 254 | 328 | View Code Duplication | public function getDeleteDiff() |
| 262 | |||
| 263 | /** |
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| 264 | * INTERNAL: |
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| 265 | * getInsertDiff |
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| 266 | * |
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| 267 | * @return array |
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| 268 | */ |
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| 269 | 328 | View Code Duplication | public function getInsertDiff() |
| 277 | |||
| 278 | /** |
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| 279 | * INTERNAL: Gets the association mapping of the collection. |
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| 280 | * |
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| 281 | * @return array |
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| 282 | */ |
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| 283 | 554 | public function getMapping() |
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| 287 | |||
| 288 | /** |
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| 289 | * Marks this collection as changed/dirty. |
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| 290 | * |
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| 291 | * @return void |
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| 292 | */ |
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| 293 | 154 | private function changed() |
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| 309 | |||
| 310 | /** |
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| 311 | * Gets a boolean flag indicating whether this collection is dirty which means |
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| 312 | * its state needs to be synchronized with the database. |
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| 313 | * |
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| 314 | * @return boolean TRUE if the collection is dirty, FALSE otherwise. |
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| 315 | */ |
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| 316 | 802 | public function isDirty() |
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| 320 | |||
| 321 | /** |
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| 322 | * Sets a boolean flag, indicating whether this collection is dirty. |
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| 323 | * |
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| 324 | * @param boolean $dirty Whether the collection should be marked dirty or not. |
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| 325 | * |
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| 326 | * @return void |
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| 327 | */ |
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| 328 | 790 | public function setDirty($dirty) |
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| 332 | |||
| 333 | /** |
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| 334 | * Sets the initialized flag of the collection, forcing it into that state. |
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| 335 | * |
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| 336 | * @param boolean $bool |
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| 337 | * |
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| 338 | * @return void |
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| 339 | */ |
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| 340 | 538 | public function setInitialized($bool) |
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| 344 | |||
| 345 | /** |
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| 346 | * {@inheritdoc} |
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| 347 | */ |
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| 348 | 16 | View Code Duplication | public function remove($key) |
| 371 | |||
| 372 | /** |
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| 373 | * {@inheritdoc} |
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| 374 | */ |
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| 375 | 27 | public function removeElement($element) |
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| 404 | |||
| 405 | /** |
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| 406 | * {@inheritdoc} |
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| 407 | */ |
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| 408 | 28 | View Code Duplication | public function containsKey($key) |
| 419 | |||
| 420 | /** |
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| 421 | * {@inheritdoc} |
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| 422 | */ |
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| 423 | 34 | View Code Duplication | public function contains($element) |
| 433 | |||
| 434 | /** |
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| 435 | * {@inheritdoc} |
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| 436 | */ |
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| 437 | 86 | public function get($key) |
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| 452 | |||
| 453 | /** |
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| 454 | * {@inheritdoc} |
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| 455 | */ |
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| 456 | 735 | public function count() |
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| 466 | |||
| 467 | /** |
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| 468 | * {@inheritdoc} |
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| 469 | */ |
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| 470 | 4 | View Code Duplication | public function set($key, $value) |
| 480 | |||
| 481 | /** |
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| 482 | * {@inheritdoc} |
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| 483 | */ |
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| 484 | 118 | View Code Duplication | public function add($value) |
| 496 | |||
| 497 | /* ArrayAccess implementation */ |
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| 498 | |||
| 499 | /** |
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| 500 | * {@inheritdoc} |
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| 501 | */ |
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| 502 | 17 | public function offsetExists($offset) |
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| 506 | |||
| 507 | /** |
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| 508 | * {@inheritdoc} |
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| 509 | */ |
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| 510 | 62 | public function offsetGet($offset) |
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| 514 | |||
| 515 | /** |
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| 516 | * {@inheritdoc} |
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| 517 | */ |
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| 518 | 96 | public function offsetSet($offset, $value) |
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| 527 | |||
| 528 | /** |
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| 529 | * {@inheritdoc} |
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| 530 | */ |
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| 531 | 6 | public function offsetUnset($offset) |
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| 535 | |||
| 536 | /** |
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| 537 | * {@inheritdoc} |
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| 538 | */ |
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| 539 | 791 | public function isEmpty() |
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| 543 | |||
| 544 | /** |
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| 545 | * {@inheritdoc} |
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| 546 | */ |
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| 547 | 21 | public function clear() |
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| 581 | |||
| 582 | /** |
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| 583 | * Called by PHP when this collection is serialized. Ensures that only the |
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| 584 | * elements are properly serialized. |
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| 585 | * |
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| 586 | * Internal note: Tried to implement Serializable first but that did not work well |
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| 587 | * with circular references. This solution seems simpler and works well. |
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| 588 | * |
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| 589 | * @return array |
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| 590 | */ |
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| 591 | 2 | public function __sleep() |
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| 595 | |||
| 596 | /** |
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| 597 | * Extracts a slice of $length elements starting at position $offset from the Collection. |
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| 598 | * |
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| 599 | * If $length is null it returns all elements from $offset to the end of the Collection. |
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| 600 | * Keys have to be preserved by this method. Calling this method will only return the |
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| 601 | * selected slice and NOT change the elements contained in the collection slice is called on. |
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| 602 | * |
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| 603 | * @param int $offset |
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| 604 | * @param int|null $length |
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| 605 | * |
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| 606 | * @return array |
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| 607 | */ |
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| 608 | 15 | View Code Duplication | public function slice($offset, $length = null) |
| 618 | |||
| 619 | /** |
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| 620 | * Cleans up internal state of cloned persistent collection. |
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| 621 | * |
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| 622 | * The following problems have to be prevented: |
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| 623 | * 1. Added entities are added to old PC |
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| 624 | * 2. New collection is not dirty, if reused on other entity nothing |
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| 625 | * changes. |
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| 626 | * 3. Snapshot leads to invalid diffs being generated. |
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| 627 | * 4. Lazy loading grabs entities from old owner object. |
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| 628 | * 5. New collection is connected to old owner and leads to duplicate keys. |
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| 629 | * |
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| 630 | * @return void |
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| 631 | */ |
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| 632 | 11 | public function __clone() |
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| 645 | |||
| 646 | /** |
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| 647 | * Selects all elements from a selectable that match the expression and |
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| 648 | * return a new collection containing these elements. |
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| 649 | * |
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| 650 | * @param \Doctrine\Common\Collections\Criteria $criteria |
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| 651 | * |
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| 652 | * @return Collection |
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| 653 | * |
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| 654 | * @throws \RuntimeException |
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| 655 | */ |
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| 656 | 15 | public function matching(Criteria $criteria) |
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| 686 | |||
| 687 | /** |
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| 688 | * Retrieves the wrapped Collection instance. |
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| 689 | * |
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| 690 | * @return \Doctrine\Common\Collections\Collection |
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| 691 | */ |
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| 692 | 795 | public function unwrap() |
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| 696 | |||
| 697 | /** |
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| 698 | * {@inheritdoc} |
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| 699 | */ |
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| 700 | 147 | protected function doInitialize() |
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| 717 | |||
| 718 | /** |
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| 719 | * @param object[] $newObjects |
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| 720 | * |
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| 721 | * Note: the only reason why this entire looping/complexity is performed via `spl_object_hash` |
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| 722 | * is because we want to prevent using `array_udiff()`, which is likely to cause very |
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| 723 | * high overhead (complexity of O(n^2)). `array_diff_key()` performs the operation in |
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| 724 | * core, which is faster than using a callback for comparisons |
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| 725 | */ |
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| 726 | 17 | private function restoreNewObjectsInDirtyCollection(array $newObjects) : void |
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| 740 | } |
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| 741 |
Loading history...
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.