Complex classes like FieldHelper 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 FieldHelper, and based on these observations, apply Extract Interface, too.
1 | <?php |
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15 | final class FieldHelper |
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16 | { |
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17 | /** |
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18 | * @var string |
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19 | */ |
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20 | private $field; |
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21 | |||
22 | /** |
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23 | * Field constructor. |
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24 | */ |
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25 | public function __construct(string $field) |
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29 | |||
30 | /** |
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31 | * @return Expression |
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32 | * @throws \InvalidArgumentException |
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33 | */ |
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34 | public function isNull(): Expression |
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38 | |||
39 | /** |
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40 | * @return Expression |
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41 | * @throws \InvalidArgumentException |
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42 | */ |
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43 | public function isNotNull(): Expression |
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47 | |||
48 | /** |
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49 | * @return Expression |
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50 | * @throws \InvalidArgumentException |
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51 | */ |
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52 | public function isTrue(): Expression |
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56 | |||
57 | /** |
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58 | * @return Expression |
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59 | * @throws \InvalidArgumentException |
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60 | */ |
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61 | public function isFalse(): Expression |
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65 | |||
66 | /** |
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67 | * @param array $values |
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68 | * @param null|string $placeholder |
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69 | * @param string $glue |
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70 | * @return Expression |
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71 | * @throws \InvalidArgumentException |
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72 | */ |
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73 | public function in(array $values, ?string $placeholder = '?', string $glue = ', '): Expression |
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106 | |||
107 | /** |
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108 | * @param array $values |
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109 | * @param string $placeholder |
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110 | * @param string $glue |
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111 | * @return Expression |
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112 | * @throws \InvalidArgumentException |
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113 | */ |
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114 | public function notIn(array $values, ?string $placeholder = '?', string $glue = ', '): Expression |
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147 | |||
148 | /** |
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149 | * @param $value |
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150 | * @param string $placeholder |
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151 | * @return Expression |
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152 | * @throws \InvalidArgumentException |
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153 | */ |
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154 | public function equals($value, ?string $placeholder = '?'): Expression |
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172 | |||
173 | /** |
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174 | * @param $value |
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175 | * @param string $placeholder |
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176 | * @return Expression |
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177 | * @throws \InvalidArgumentException |
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178 | */ |
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179 | public function notEquals($value, ?string $placeholder = '?'): Expression |
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197 | |||
198 | /** |
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199 | * @param $value |
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200 | * @param string $placeholder |
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201 | * @return Expression |
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202 | * @throws \InvalidArgumentException |
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203 | */ |
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204 | public function lt($value, ?string $placeholder = '?'): Expression |
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222 | |||
223 | /** |
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224 | * @param $value |
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225 | * @param string $placeholder |
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226 | * @return Expression |
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227 | * @throws \InvalidArgumentException |
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228 | */ |
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229 | public function lte($value, ?string $placeholder = '?'): Expression |
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247 | |||
248 | /** |
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249 | * @param $value |
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250 | * @param string $placeholder |
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251 | * @return Expression |
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252 | * @throws \InvalidArgumentException |
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253 | */ |
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254 | public function gt($value, ?string $placeholder = '?'): Expression |
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272 | |||
273 | /** |
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274 | * @param $value |
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275 | * @param string $placeholder |
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276 | * @return Expression |
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277 | * @throws \InvalidArgumentException |
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278 | */ |
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279 | public function gte($value, ?string $placeholder = '?'): Expression |
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297 | |||
298 | /** |
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299 | * @param $start |
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300 | * @param $end |
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301 | * @param string $placeholder |
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302 | * @return Expression |
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303 | * @throws \InvalidArgumentException |
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304 | */ |
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305 | public function between($start, $end, ?string $placeholder = '?'): Expression |
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331 | |||
332 | /** |
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333 | * @param $start |
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334 | * @param $end |
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335 | * @param string $placeholder |
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336 | * @return Expression |
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337 | * @throws \InvalidArgumentException |
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338 | */ |
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339 | public function notBetween($start, $end, ?string $placeholder = '?'): Expression |
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365 | |||
366 | /** |
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367 | * @param string $value |
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368 | * @param string $placeholder |
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369 | * @param string $surroundWith |
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370 | * @return Expression |
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371 | * @throws \InvalidArgumentException |
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372 | */ |
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373 | public function like(string $value, ?string $placeholder = '?', string $surroundWith = '%'): Expression |
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392 | |||
393 | /** |
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394 | * @param string $value |
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395 | * @param string $placeholder |
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396 | * @param string $surroundWith |
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397 | * @return Expression |
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398 | * @throws \InvalidArgumentException |
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399 | */ |
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400 | public function notLike(string $value, ?string $placeholder = '?', string $surroundWith = '%'): Expression |
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419 | |||
420 | /** |
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421 | * @param string $value |
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422 | * @param string $placeholder |
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423 | * @param string $surroundWith |
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424 | * @return Expression |
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425 | * @throws \InvalidArgumentException |
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426 | */ |
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427 | public function startsWith(string $value, ?string $placeholder = '?', string $surroundWith = '%'): Expression |
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446 | |||
447 | /** |
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448 | * @param string $value |
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449 | * @param string $placeholder |
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450 | * @param string $surroundWith |
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451 | * @return Expression |
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452 | * @throws \InvalidArgumentException |
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453 | */ |
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454 | public function notStartsWith(string $value, ?string $placeholder = '?', string $surroundWith = '%'): Expression |
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473 | |||
474 | /** |
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475 | * @param string $value |
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476 | * @param string $placeholder |
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477 | * @param string $surroundWith |
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478 | * @return Expression |
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479 | * @throws \InvalidArgumentException |
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480 | */ |
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481 | public function endsWith(string $value, ?string $placeholder = '?', string $surroundWith = '%'): Expression |
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500 | |||
501 | /** |
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502 | * @param string $value |
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503 | * @param string $placeholder |
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504 | * @param string $surroundWith |
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505 | * @return Expression |
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506 | * @throws \InvalidArgumentException |
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507 | */ |
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508 | public function notEndsWith(string $value, ?string $placeholder = '?', string $surroundWith = '%'): Expression |
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527 | } |
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528 |