Complex classes like Locale 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 Locale, and based on these observations, apply Extract Interface, too.
1 | <?php |
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8 | final class Locale |
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9 | { |
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10 | /** |
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11 | * @var string|null Two-letter ISO-639-2 language code |
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12 | * @see http://www.loc.gov/standards/iso639-2/ |
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13 | */ |
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14 | private $language; |
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15 | |||
16 | /** |
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17 | * @var string|null extended language subtags |
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18 | */ |
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19 | private $extendedLanguage; |
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20 | |||
21 | /** |
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22 | * @var string|null |
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23 | */ |
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24 | private $extension; |
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25 | |||
26 | /** |
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27 | * @var string|null Four-letter ISO 15924 script code |
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28 | * @see http://www.unicode.org/iso15924/iso15924-codes.html |
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29 | */ |
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30 | private $script; |
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31 | |||
32 | /** |
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33 | * @var string|null Two-letter ISO 3166-1 country code |
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34 | * @see https://www.iso.org/iso-3166-country-codes.html |
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35 | */ |
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36 | private $region; |
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37 | |||
38 | /** |
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39 | * @var string|null variant of language conventions to use |
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40 | */ |
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41 | private $variant; |
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42 | |||
43 | /** |
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44 | * @var string|null ICU currency |
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45 | */ |
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46 | private $currency; |
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47 | |||
48 | /** |
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49 | * @var string|null ICU calendar |
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50 | */ |
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51 | private $calendar; |
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52 | |||
53 | /** |
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54 | * @var string ICU collation |
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55 | */ |
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56 | private $collation; |
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57 | |||
58 | /** |
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59 | * @var string|null ICU numbers |
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60 | */ |
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61 | private $numbers; |
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62 | |||
63 | /** |
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64 | * @var string|null |
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65 | */ |
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66 | private $grandfathered; |
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67 | |||
68 | /** |
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69 | * @var string|null |
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70 | */ |
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71 | private $private; |
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72 | |||
73 | /** |
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74 | * Locale constructor. |
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75 | * @param string $localeString BCP 47 formatted locale string |
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76 | * @see https://tools.ietf.org/html/bcp47 |
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77 | * @throws \InvalidArgumentException |
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78 | */ |
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79 | public function __construct(string $localeString) |
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139 | |||
140 | /** |
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141 | * @return string Four-letter ISO 15924 script code |
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142 | * @see http://www.unicode.org/iso15924/iso15924-codes.html |
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143 | */ |
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144 | public function script(): ?string |
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148 | |||
149 | /** |
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150 | * @param null|string $script Four-letter ISO 15924 script code |
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151 | * @see http://www.unicode.org/iso15924/iso15924-codes.html |
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152 | * @return self |
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153 | */ |
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154 | public function withScript(?string $script): self |
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160 | |||
161 | |||
162 | /** |
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163 | * @return string variant of language conventions to use |
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164 | */ |
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165 | public function variant(): ?string |
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169 | |||
170 | /** |
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171 | * @param null|string $variant variant of language conventions to use |
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172 | * @return self |
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173 | */ |
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174 | public function withVariant(?string $variant): self |
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180 | |||
181 | /** |
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182 | * @return string|null Two-letter ISO-639-2 language code |
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183 | * @see http://www.loc.gov/standards/iso639-2/ |
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184 | */ |
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185 | public function language(): string |
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189 | |||
190 | /** |
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191 | * @param null|string $language Two-letter ISO-639-2 language code |
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192 | * @see http://www.loc.gov/standards/iso639-2/ |
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193 | * @return self |
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194 | */ |
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195 | public function withLanguage(?string $language): self |
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201 | |||
202 | /** |
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203 | * @return null|string ICU calendar |
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204 | */ |
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205 | public function calendar(): ?string |
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209 | |||
210 | /** |
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211 | * @param null|string $calendar ICU calendar |
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212 | * @return self |
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213 | */ |
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214 | public function withCalendar(?string $calendar): self |
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220 | |||
221 | |||
222 | /** |
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223 | * @return null|string ICU collation |
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224 | */ |
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225 | public function collation(): ?string |
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229 | |||
230 | /** |
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231 | * @param null|string $collation ICU collation |
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232 | * @return self |
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233 | */ |
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234 | public function withCollation(?string $collation): self |
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240 | |||
241 | /** |
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242 | * @return null|string ICU numbers |
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243 | */ |
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244 | public function numbers(): ?string |
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248 | |||
249 | /** |
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250 | * @param null|string $numbers ICU numbers |
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251 | * @return self |
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252 | */ |
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253 | public function withNumbers(?string $numbers): self |
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259 | |||
260 | /** |
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261 | * @return string Two-letter ISO 3166-1 country code |
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262 | * @see https://www.iso.org/iso-3166-country-codes.html |
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263 | */ |
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264 | public function region(): ?string |
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268 | |||
269 | /** |
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270 | * @param null|string $region Two-letter ISO 3166-1 country code |
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271 | * @see https://www.iso.org/iso-3166-country-codes.html |
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272 | * @return self |
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273 | */ |
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274 | public function withRegion(?string $region): self |
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280 | |||
281 | /** |
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282 | * @return string ICU currency |
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283 | */ |
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284 | public function currency(): ?string |
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288 | |||
289 | /** |
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290 | * @param null|string $currency ICU currency |
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291 | * @return self |
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292 | */ |
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293 | public function withCurrency(?string $currency): self |
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300 | |||
301 | /** |
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302 | * @return null|string extended language subtags |
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303 | */ |
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304 | public function extendedLanguage(): ?string |
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308 | |||
309 | /** |
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310 | * @param null|string $extendedLanguage extended language subtags |
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311 | * @return self |
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312 | */ |
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313 | public function withExtendedLanguage(?string $extendedLanguage): self |
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320 | |||
321 | |||
322 | /** |
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323 | * @return null|string |
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324 | */ |
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325 | public function private(): ?string |
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329 | |||
330 | /** |
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331 | * @param null|string $private |
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332 | * @return self |
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333 | */ |
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334 | public function withPrivate(?string $private): self |
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341 | |||
342 | /** |
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343 | * @return string regular expression for parsing BCP 47 |
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344 | * @see https://tools.ietf.org/html/bcp47 |
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345 | */ |
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346 | private static function getBCP47Regex(): string |
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363 | |||
364 | public function __toString(): string |
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368 | |||
369 | /** |
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370 | * @return string |
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371 | */ |
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372 | public function asString(): string |
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429 | |||
430 | /** |
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431 | * Returns fallback locale |
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432 | * |
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433 | * @return self fallback locale |
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434 | */ |
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435 | public function fallbackLocale(): self |
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459 | } |
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460 |
Late static binding only has effect in subclasses. A
final
class cannot be extended anymore so late static binding cannot occurr. Consider replacingstatic::
withself::
.To learn more about late static binding, please refer to the PHP core documentation.