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 Path 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 Path, and based on these observations, apply Extract Interface, too.
1 | <?php |
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11 | class Path { |
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12 | |||
13 | /** |
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14 | * The path to the directory that backup files are stored in |
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15 | * |
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16 | * @var string $this->path |
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17 | */ |
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18 | private $path; |
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19 | |||
20 | /** |
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21 | * The path to the directory that will be backed up |
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22 | * |
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23 | * @var string $this->root |
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24 | */ |
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25 | private $root; |
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26 | |||
27 | /** |
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28 | * The path to the directory that backup files are stored in |
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29 | * |
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30 | * @var string $this->path |
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31 | */ |
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32 | private $custom_path; |
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33 | |||
34 | /** |
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35 | * Contains the instantiated Path instance |
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36 | * |
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37 | * @var Path $this->instance |
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38 | */ |
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39 | private static $instance; |
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40 | |||
41 | /** |
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42 | * Protected constructor to prevent creating a new instance of the |
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43 | * *Singleton* via the `new` operator from outside of this class. |
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44 | */ |
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45 | protected function __construct() {} |
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46 | |||
47 | /** |
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48 | * Private clone method to prevent cloning of the instance of the |
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49 | * *Singleton* instance. |
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50 | */ |
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51 | private function __clone() {} |
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52 | |||
53 | /** |
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54 | * Private unserialize method to prevent unserializing of the *Singleton* |
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55 | * instance. |
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56 | */ |
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57 | private function __wakeup() {} |
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58 | |||
59 | /** |
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60 | * Returns the *Singleton* instance of this class. |
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61 | * |
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62 | * @staticvar Path $instance The *Singleton* instances of this class. |
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63 | * |
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64 | * @return Path The *Singleton* instance. |
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65 | */ |
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66 | public static function get_instance() { |
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67 | |||
68 | if ( ! ( self::$instance instanceof Path ) ) { |
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69 | self::$instance = new Path(); |
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70 | } |
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71 | |||
72 | return self::$instance; |
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73 | } |
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74 | |||
75 | /** |
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76 | * Convenience method for quickly grabbing the path |
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77 | */ |
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78 | public static function get_path() { |
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81 | |||
82 | /** |
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83 | * Convenience method for quickly grabbing the root |
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84 | */ |
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85 | public static function get_root() { |
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88 | |||
89 | /** |
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90 | * Calculate the path to the site "home" directory. |
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91 | * |
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92 | * The home directory is the path equivalent to the home_url. That is, |
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93 | * the path to the true root of the website. In situations where WordPress is |
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94 | * installed in a subdirectory the home path is different to ABSPATH |
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95 | * |
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96 | * @param string $site_path The site_path to use when calculating the home path, defaults to ABSPATH |
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97 | */ |
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98 | public static function get_home_path( $site_path = ABSPATH ) { |
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123 | |||
124 | /** |
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125 | * get the calculated path to the directory where backups will be stored |
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126 | */ |
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127 | private function get_calculated_path() { |
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140 | |||
141 | /** |
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142 | * Set the path directly, overriding the default |
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143 | * |
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144 | * @param $path |
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145 | */ |
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146 | public function set_path( $path ) { |
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154 | |||
155 | /** |
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156 | * get the calculated path to the directory that will be backed up |
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157 | */ |
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158 | private function get_calculated_root() { |
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173 | |||
174 | /** |
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175 | * Set the root path directly, overriding the default |
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176 | * |
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177 | * @param $root |
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178 | */ |
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179 | public function set_root( $root ) { |
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182 | |||
183 | public function reset_path() { |
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186 | |||
187 | /** |
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188 | * Get the path to the default backup location in wp-content |
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189 | */ |
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190 | public function get_default_path() { |
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193 | |||
194 | /** |
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195 | * Get the path to the fallback backup location in uploads |
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196 | */ |
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197 | public function get_fallback_path() { |
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204 | |||
205 | /** |
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206 | * Get the path to the custom backup location if it's been set |
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207 | */ |
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208 | public function get_custom_path() { |
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221 | |||
222 | /** |
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223 | * Builds an array containing existing backups folders. |
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224 | * |
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225 | * @return array |
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226 | */ |
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227 | public function get_existing_paths() { |
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246 | |||
247 | /** |
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248 | * Returns the first existing path if there is one |
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249 | * |
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250 | * @return string Backup path if found empty string if not |
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251 | */ |
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252 | public function get_existing_path() { |
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263 | |||
264 | /** |
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265 | * Calculate the backup path and create the directory if it doesn't exist. |
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266 | * |
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267 | * Tries all possible locations and uses the first one possible |
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268 | * |
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269 | * @return |
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270 | */ |
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271 | public function calculate_path() { |
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303 | |||
304 | /** |
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305 | * Protect the directory that backups are stored in |
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306 | * |
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307 | * - Adds an index.html file in an attempt to disable directory browsing |
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308 | * - Adds a .httaccess file to deny direct access if on Apache |
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309 | * |
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310 | * @param string $reset |
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311 | */ |
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312 | public function protect_path( $reset = 'no' ) { |
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352 | |||
353 | /** |
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354 | * If we have more than one path then move any existing backups to the current path and remove them |
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355 | */ |
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356 | public function merge_existing_paths() { |
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367 | |||
368 | /** |
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369 | * Move backup files from an existing directory and the new |
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370 | * location |
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371 | * |
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372 | * @param string $path The path to move the backups from |
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373 | */ |
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374 | public function move_old_backups( $from ) { |
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415 | |||
416 | /** |
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417 | * Clean any temporary / incomplete backups from the backups directory |
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418 | */ |
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419 | public function cleanup() { |
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437 | |||
438 | } |
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439 | |||
447 |
Our type inference engine in quite powerful, but sometimes the code does not provide enough clues to go by. In these cases we request you to add a
@return
annotation as described here.