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 QuizAnswer 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 QuizAnswer, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 17 | class QuizAnswer implements InputFilterAwareInterface |
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| 18 | { |
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| 19 | protected $inputFilter; |
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| 20 | |||
| 21 | /** |
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| 22 | * @ORM\Id |
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| 23 | * @ORM\Column(type="integer"); |
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| 24 | * @ORM\GeneratedValue(strategy="AUTO") |
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| 25 | */ |
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| 26 | protected $id; |
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| 27 | |||
| 28 | /** |
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| 29 | * @ORM\ManyToOne(targetEntity="QuizQuestion", inversedBy="answers") |
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| 30 | * |
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| 31 | **/ |
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| 32 | protected $question; |
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| 33 | |||
| 34 | /** |
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| 35 | * @ORM\Column(type="text", nullable=true) |
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| 36 | */ |
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| 37 | protected $answer; |
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| 38 | |||
| 39 | /** |
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| 40 | * Explanation of the answer |
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| 41 | * @ORM\Column(type="text", nullable=true) |
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| 42 | */ |
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| 43 | protected $explanation; |
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| 44 | |||
| 45 | /** |
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| 46 | * @ORM\Column(name="json_data", type="text", nullable=true) |
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| 47 | */ |
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| 48 | protected $jsonData; |
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| 49 | |||
| 50 | /** |
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| 51 | * @ORM\Column(type="string", nullable=true) |
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| 52 | */ |
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| 53 | protected $video; |
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| 54 | |||
| 55 | /** |
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| 56 | * @ORM\Column(type="string", nullable=true) |
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| 57 | */ |
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| 58 | protected $image; |
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| 59 | |||
| 60 | /** |
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| 61 | * The answer score in the game |
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| 62 | * @ORM\Column(type="integer", nullable=true) |
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| 63 | */ |
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| 64 | protected $points = 0; |
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| 65 | |||
| 66 | /** |
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| 67 | * @ORM\Column(type="integer", nullable=false) |
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| 68 | */ |
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| 69 | protected $position = 0; |
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| 70 | |||
| 71 | /** |
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| 72 | * |
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| 73 | * @ORM\Column(type="boolean", nullable=true) |
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| 74 | */ |
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| 75 | protected $correct = 0; |
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| 76 | |||
| 77 | /** |
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| 78 | * @ORM\Column(type="datetime") |
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| 79 | */ |
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| 80 | protected $created_at; |
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| 81 | |||
| 82 | /** |
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| 83 | * @ORM\Column(type="datetime") |
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| 84 | */ |
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| 85 | protected $updated_at; |
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| 86 | |||
| 87 | /** @PrePersist */ |
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| 88 | public function createChrono() |
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| 93 | |||
| 94 | /** @PreUpdate */ |
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| 95 | public function updateChrono() |
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| 99 | |||
| 100 | /** |
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| 101 | * @return the unknown_type |
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| 102 | */ |
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| 103 | public function getId() |
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| 107 | |||
| 108 | /** |
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| 109 | * @param unknown_type $id |
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| 110 | */ |
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| 111 | public function setId($id) |
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| 117 | |||
| 118 | /** |
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| 119 | * @return the unknown_type |
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| 120 | */ |
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| 121 | public function getQuestion() |
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| 125 | |||
| 126 | /** |
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| 127 | * @param unknown_type $question |
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| 128 | */ |
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| 129 | public function setQuestion($question) |
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| 135 | |||
| 136 | /** |
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| 137 | * @return the unknown_type |
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| 138 | */ |
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| 139 | public function getAnswer() |
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| 143 | |||
| 144 | /** |
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| 145 | * @param unknown_type $answer |
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| 146 | */ |
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| 147 | public function setAnswer($answer) |
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| 153 | |||
| 154 | /** |
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| 155 | * @return the unknown_type |
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| 156 | */ |
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| 157 | public function getExplanation() |
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| 161 | |||
| 162 | /** |
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| 163 | * @param unknown_type $explanation |
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| 164 | */ |
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| 165 | public function setExplanation($explanation) |
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| 171 | |||
| 172 | /** |
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| 173 | * @return the string |
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| 174 | */ |
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| 175 | public function getJsonData() |
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| 179 | |||
| 180 | /** |
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| 181 | * @param string $hint |
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|
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| 182 | */ |
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| 183 | public function setJsonData($jsonData) |
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| 189 | |||
| 190 | /** |
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| 191 | * @return the unknown_type |
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| 192 | */ |
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| 193 | public function getVideo() |
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| 197 | |||
| 198 | /** |
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| 199 | * @param unknown_type $video |
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| 200 | */ |
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| 201 | public function setVideo($video) |
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| 207 | |||
| 208 | /** |
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| 209 | * @return the unknown_type |
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| 210 | */ |
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| 211 | public function getImage() |
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| 215 | |||
| 216 | /** |
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| 217 | * @param unknown_type $image |
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| 218 | */ |
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| 219 | public function setImage($image) |
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| 225 | |||
| 226 | /** |
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| 227 | * @return integer unknown_type |
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| 228 | */ |
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| 229 | public function getPoints() |
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| 233 | |||
| 234 | /** |
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| 235 | * @param unknown_type $points |
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| 236 | */ |
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| 237 | public function setPoints($points) |
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| 243 | |||
| 244 | /** |
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| 245 | * @return integer unknown_type |
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| 246 | */ |
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| 247 | public function getPosition() |
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| 251 | |||
| 252 | /** |
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| 253 | * @param unknown_type $position |
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| 254 | */ |
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| 255 | public function setPosition($position) |
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| 261 | |||
| 262 | /** |
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| 263 | * @return integer unknown_type |
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| 264 | */ |
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| 265 | public function getCorrect() |
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| 269 | |||
| 270 | /** |
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| 271 | * @param unknown_type $correct |
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| 272 | */ |
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| 273 | public function setCorrect($correct) |
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| 279 | |||
| 280 | /** |
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| 281 | * @return the unknown_type |
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| 282 | */ |
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| 283 | public function getCreatedAt() |
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| 287 | |||
| 288 | /** |
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| 289 | * @param unknown_type $created_at |
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| 290 | */ |
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| 291 | public function setCreatedAt($created_at) |
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| 297 | |||
| 298 | /** |
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| 299 | * @return the unknown_type |
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| 300 | */ |
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| 301 | public function getUpdatedAt() |
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| 305 | |||
| 306 | /** |
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| 307 | * @param unknown_type $updated_at |
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| 308 | */ |
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| 309 | public function setUpdatedAt($updated_at) |
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| 315 | |||
| 316 | /** |
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| 317 | * Convert the object to an array. |
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| 318 | * |
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| 319 | * @return array |
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| 320 | */ |
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| 321 | public function getArrayCopy() |
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| 327 | |||
| 328 | /** |
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| 329 | * Populate from an array. |
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| 330 | * |
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| 331 | * @param array $data |
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| 332 | */ |
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| 333 | public function populate($data = array()) |
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| 371 | |||
| 372 | public function setInputFilter(InputFilterInterface $inputFilter) |
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| 376 | |||
| 377 | public function getInputFilter() |
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| 441 | } |
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| 442 |
This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function.
Consider the following example. The parameter
$italyis not defined by the methodfinale(...).The most likely cause is that the parameter was removed, but the annotation was not.