Complex classes like ClassLoader 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 ClassLoader, and based on these observations, apply Extract Interface, too.
1 | <?php |
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43 | class ClassLoader |
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44 | { |
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45 | // PSR-4 |
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46 | private $prefixLengthsPsr4 = array(); |
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47 | private $prefixDirsPsr4 = array(); |
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48 | private $fallbackDirsPsr4 = array(); |
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49 | |||
50 | // PSR-0 |
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51 | private $prefixesPsr0 = array(); |
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52 | private $fallbackDirsPsr0 = array(); |
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53 | |||
54 | private $useIncludePath = false; |
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55 | private $classMap = array(); |
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56 | |||
57 | private $classMapAuthoritative = false; |
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58 | |||
59 | public function getPrefixes() |
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67 | |||
68 | public function getPrefixesPsr4() |
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72 | |||
73 | public function getFallbackDirs() |
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77 | |||
78 | public function getFallbackDirsPsr4() |
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82 | |||
83 | public function getClassMap() |
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87 | |||
88 | /** |
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89 | * @param array $classMap Class to filename map |
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90 | */ |
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91 | public function addClassMap(array $classMap) |
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99 | |||
100 | /** |
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101 | * Registers a set of PSR-0 directories for a given prefix, either |
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102 | * appending or prepending to the ones previously set for this prefix. |
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103 | * |
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104 | * @param string $prefix The prefix |
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105 | * @param array|string $paths The PSR-0 root directories |
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106 | * @param bool $prepend Whether to prepend the directories |
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107 | */ |
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108 | public function add($prefix, $paths, $prepend = false) |
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144 | |||
145 | /** |
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146 | * Registers a set of PSR-4 directories for a given namespace, either |
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147 | * appending or prepending to the ones previously set for this namespace. |
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148 | * |
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149 | * @param string $prefix The prefix/namespace, with trailing '\\' |
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150 | * @param array|string $paths The PSR-4 base directories |
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151 | * @param bool $prepend Whether to prepend the directories |
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152 | * |
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153 | * @throws \InvalidArgumentException |
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154 | */ |
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155 | public function addPsr4($prefix, $paths, $prepend = false) |
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192 | |||
193 | /** |
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194 | * Registers a set of PSR-0 directories for a given prefix, |
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195 | * replacing any others previously set for this prefix. |
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196 | * |
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197 | * @param string $prefix The prefix |
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198 | * @param array|string $paths The PSR-0 base directories |
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199 | */ |
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200 | public function set($prefix, $paths) |
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208 | |||
209 | /** |
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210 | * Registers a set of PSR-4 directories for a given namespace, |
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211 | * replacing any others previously set for this namespace. |
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212 | * |
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213 | * @param string $prefix The prefix/namespace, with trailing '\\' |
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214 | * @param array|string $paths The PSR-4 base directories |
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215 | * |
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216 | * @throws \InvalidArgumentException |
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217 | */ |
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218 | public function setPsr4($prefix, $paths) |
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231 | |||
232 | /** |
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233 | * Turns on searching the include path for class files. |
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234 | * |
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235 | * @param bool $useIncludePath |
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236 | */ |
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237 | public function setUseIncludePath($useIncludePath) |
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241 | |||
242 | /** |
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243 | * Can be used to check if the autoloader uses the include path to check |
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244 | * for classes. |
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245 | * |
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246 | * @return bool |
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247 | */ |
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248 | public function getUseIncludePath() |
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252 | |||
253 | /** |
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254 | * Turns off searching the prefix and fallback directories for classes |
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255 | * that have not been registered with the class map. |
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256 | * |
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257 | * @param bool $classMapAuthoritative |
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258 | */ |
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259 | public function setClassMapAuthoritative($classMapAuthoritative) |
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263 | |||
264 | /** |
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265 | * Should class lookup fail if not found in the current class map? |
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266 | * |
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267 | * @return bool |
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268 | */ |
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269 | public function isClassMapAuthoritative() |
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273 | |||
274 | /** |
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275 | * Registers this instance as an autoloader. |
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276 | * |
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277 | * @param bool $prepend Whether to prepend the autoloader or not |
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278 | */ |
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279 | public function register($prepend = false) |
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283 | |||
284 | /** |
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285 | * Unregisters this instance as an autoloader. |
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286 | */ |
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287 | public function unregister() |
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291 | |||
292 | /** |
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293 | * Loads the given class or interface. |
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294 | * |
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295 | * @param string $class The name of the class |
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296 | * @return bool|null True if loaded, null otherwise |
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297 | */ |
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298 | public function loadClass($class) |
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306 | |||
307 | /** |
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308 | * Finds the path to the file where the class is defined. |
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309 | * |
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310 | * @param string $class The name of the class |
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311 | * |
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312 | * @return string|false The path if found, false otherwise |
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313 | */ |
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314 | public function findFile($class) |
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343 | |||
344 | private function findFileWithExtension($class, $ext) |
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403 | } |
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404 | |||
414 |