Complex classes like EditCounter 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 EditCounter, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 11 | class EditCounter extends Model  | 
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| 12 | { | 
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| 13 | |||
| 14 | /** @var Project */  | 
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| 15 | protected $project;  | 
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| 16 | |||
| 17 | /** @var User */  | 
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| 18 | protected $user;  | 
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| 19 | |||
| 20 | /** @var int[] */  | 
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| 21 | protected $revisionCounts;  | 
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| 22 | |||
| 23 | /** @var string[] */  | 
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| 24 | protected $revisionDates;  | 
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| 25 | |||
| 26 | /** @var int[] */  | 
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| 27 | protected $pageCounts;  | 
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| 28 | |||
| 29 | /** @var int[] */  | 
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| 30 | protected $logCounts;  | 
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| 31 | |||
| 32 | public function __construct(Project $project, User $user)  | 
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| 37 | |||
| 38 | /**  | 
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| 39 | * Get revision count data.  | 
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| 40 | * @return int[]  | 
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| 41 | */  | 
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| 42 | protected function getRevisionCounts()  | 
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| 50 | |||
| 51 | /**  | 
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| 52 | * Get revision dates.  | 
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| 53 | * @return int[]  | 
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| 54 | */  | 
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| 55 | protected function getRevisionDates()  | 
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| 63 | |||
| 64 | /**  | 
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| 65 | * Get page count data.  | 
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| 66 | * @return int[]  | 
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| 67 | */  | 
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| 68 | protected function getPageCounts()  | 
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| 76 | |||
| 77 | /**  | 
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| 78 | * Get revision dates.  | 
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| 79 | * @return int[]  | 
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| 80 | */  | 
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| 81 | protected function getLogCounts()  | 
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| 89 | |||
| 90 | public function countLiveRevisions()  | 
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| 95 | |||
| 96 | /**  | 
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| 97 | * Get the total number of revisions that have been deleted.  | 
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| 98 | * @return int  | 
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| 99 | */  | 
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| 100 | public function countDeletedRevisions()  | 
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| 105 | |||
| 106 | /**  | 
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| 107 | * Get the total edit count (live + deleted).  | 
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| 108 | * @return int  | 
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| 109 | */  | 
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| 110 | public function countAllRevisions()  | 
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| 114 | |||
| 115 | /**  | 
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| 116 | * Get the total number of revisions with comments.  | 
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| 117 | * @return int  | 
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| 118 | */  | 
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| 119 | public function countRevisionsWithComments()  | 
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| 124 | |||
| 125 | /**  | 
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| 126 | * Get the total number of revisions without comments.  | 
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| 127 | * @return int  | 
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| 128 | */  | 
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| 129 | public function countRevisionsWithoutComments()  | 
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| 133 | |||
| 134 | /**  | 
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| 135 | * Get the total number of revisions marked as 'minor' by the user.  | 
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| 136 | * @return int  | 
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| 137 | */  | 
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| 138 | public function countMinorRevisions()  | 
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| 143 | |||
| 144 | /**  | 
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| 145 | * Get the total number of revisions under 20 bytes.  | 
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| 146 | */  | 
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| 147 | public function countSmallRevisions()  | 
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| 152 | |||
| 153 | /**  | 
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| 154 | * Get the total number of revisions over 1000 bytes.  | 
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| 155 | */  | 
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| 156 | public function countLargeRevisions()  | 
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| 161 | |||
| 162 | /**  | 
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| 163 | * Get the average revision size for the user.  | 
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| 164 | * @return float Size in bytes.  | 
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| 165 | */  | 
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| 166 | public function averageRevisionSize()  | 
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| 171 | |||
| 172 | /**  | 
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| 173 | * Get the total number of non-deleted pages edited by the user.  | 
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| 174 | * @return int  | 
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| 175 | */  | 
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| 176 | public function countLivePagesEdited()  | 
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| 181 | |||
| 182 | /**  | 
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| 183 | * Get the total number of deleted pages ever edited by the user.  | 
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| 184 | * @return int  | 
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| 185 | */  | 
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| 186 | public function countDeletedPagesEdited()  | 
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| 191 | |||
| 192 | /**  | 
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| 193 | * Get the total number of pages ever edited by this user (both live and deleted).  | 
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| 194 | * @return int  | 
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| 195 | */  | 
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| 196 | public function countAllPagesEdited()  | 
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| 200 | |||
| 201 | /**  | 
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| 202 | * Get the total number of semi-automated edits.  | 
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| 203 | * @return int  | 
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| 204 | */  | 
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| 205 | public function countAutomatedEdits()  | 
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| 208 | |||
| 209 | /**  | 
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| 210 | * Get the total number of pages (both still live and those that have been deleted) created  | 
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| 211 | * by the user.  | 
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| 212 | * @return int  | 
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| 213 | */  | 
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| 214 | public function countPagesCreated()  | 
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| 218 | |||
| 219 | /**  | 
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| 220 | * Get the total number of pages created by the user, that have not been deleted.  | 
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| 221 | * @return int  | 
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| 222 | */  | 
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| 223 | public function countCreatedPagesLive()  | 
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| 228 | |||
| 229 | /**  | 
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| 230 | * Get the total number of pages created by the user, that have since been deleted.  | 
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| 231 | * @return int  | 
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| 232 | */  | 
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| 233 | public function countPagesCreatedDeleted()  | 
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| 238 | |||
| 239 | /**  | 
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| 240 | * Get the total number of pages that have been deleted by the user.  | 
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| 241 | * @return int  | 
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| 242 | */  | 
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| 243 | public function countPagesDeleted()  | 
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| 248 | |||
| 249 | /**  | 
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| 250 | * Get the total number of pages moved by the user.  | 
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| 251 | * @return int  | 
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| 252 | */  | 
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| 253 | public function countPagesMoved()  | 
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| 258 | |||
| 259 | /**  | 
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| 260 | * Get the average number of edits per page (including deleted revisions and pages).  | 
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| 261 | * @return float  | 
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| 262 | */  | 
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| 263 | public function averageRevisionsPerPage()  | 
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| 270 | |||
| 271 | /**  | 
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| 272 | * Average number of edits made per day.  | 
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| 273 | * @return float  | 
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| 274 | */  | 
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| 275 | public function averageRevisionsPerDay()  | 
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| 282 | |||
| 283 | /**  | 
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| 284 | * Get the total number of edits made by the user with semi-automating tools.  | 
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| 285 | * @TODO  | 
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| 286 | */  | 
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| 287 | public function countAutomatedRevisions()  | 
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| 291 | |||
| 292 | /**  | 
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| 293 | * Get the count of (non-deleted) edits made in the given timeframe to now.  | 
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| 294 | * @param string $time One of 'day', 'week', 'month', or 'year'.  | 
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| 295 | * @return int The total number of live edits.  | 
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| 296 | */  | 
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| 297 | public function countRevisionsInLast($time)  | 
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| 302 | |||
| 303 | /**  | 
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| 304 | * Get the date and time of the user's first edit.  | 
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| 305 | */  | 
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| 306 | public function datetimeFirstRevision()  | 
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| 311 | |||
| 312 | /**  | 
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| 313 | * Get the date and time of the user's first edit.  | 
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| 314 | * @return DateTime  | 
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| 315 | */  | 
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| 316 | public function datetimeLastRevision()  | 
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| 321 | |||
| 322 | /**  | 
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| 323 | * Get the number of days between the first and last edits.  | 
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| 324 | * If there's only one edit, this is counted as one day.  | 
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| 325 | * @return int  | 
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| 326 | */  | 
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| 327 | public function getDays()  | 
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| 332 | |||
| 333 | public function countFilesUploaded()  | 
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| 338 | |||
| 339 | public function countFilesUploadedCommons()  | 
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| 344 | |||
| 345 | /**  | 
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| 346 | * Get the total number of revisions the user has sent thanks for.  | 
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| 347 | * @return int  | 
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| 348 | */  | 
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| 349 | public function thanks()  | 
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| 354 | |||
| 355 | /**  | 
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| 356 | * Get the total number of approvals  | 
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| 357 | * @return int  | 
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| 358 | */  | 
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| 359 | public function approvals()  | 
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| 368 | |||
| 369 | /**  | 
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| 370 | * @return int  | 
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| 371 | */  | 
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| 372 | public function patrols()  | 
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| 377 | |||
| 378 | /**  | 
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| 379 | * Get the total edit counts for the top n projects of this user.  | 
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| 380 | * @param User $user  | 
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| 381 | * @param Project $project  | 
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| 382 | * @param int $numProjects  | 
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| 383 | * @return mixed[] Each element has 'total' and 'project' keys.  | 
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| 384 | */  | 
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| 385 | public function topProjectsEditCounts(User $user, Project $project, $numProjects = 10)  | 
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| 396 | }  | 
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| 397 | 
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different sub-classes of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the parent class: