Complex classes like FileFormFactory 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 FileFormFactory, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 17 | class FileFormFactory extends AssetFormFactory  | 
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| 18 | { | 
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| 19 | protected function getFormFieldTabs($record, $context = [])  | 
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| 37 | |||
| 38 | /**  | 
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| 39 | * Build "Usage" tab  | 
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| 40 | *  | 
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| 41 | * @param File $record  | 
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| 42 | * @param array $context  | 
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| 43 | * @return Tab  | 
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| 44 | */  | 
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| 45 | protected function getFormFieldUsageTab($record, $context = [])  | 
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| 56 | |||
| 57 | protected function getFormFieldDetailsTab($record, $context = [])  | 
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| 81 | |||
| 82 | /**  | 
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| 83 | * Create tab for file attributes  | 
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| 84 | *  | 
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| 85 | * @param File $record  | 
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| 86 | * @param array $context  | 
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| 87 | * @return Tab  | 
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| 88 | */  | 
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| 89 | protected function getFormFieldAttributesTab($record, $context = [])  | 
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| 103 | |||
| 104 | protected function getFormFieldHistoryTab($record, $context = [])  | 
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| 118 | |||
| 119 | protected function getFormFields(Controller $controller, $name, $context = [])  | 
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| 133 | |||
| 134 | /**  | 
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| 135 | * Get publish action  | 
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| 136 | *  | 
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| 137 | * @param File $record  | 
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| 138 | * @return FormAction  | 
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| 139 | */  | 
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| 140 | protected function getPublishAction($record)  | 
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| 152 | |||
| 153 | protected function getFormActions(Controller $controller, $name, $context = [])  | 
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| 174 | |||
| 175 | /**  | 
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| 176 | * Get raw HTML for image markup  | 
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| 177 | *  | 
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| 178 | * @param File $file  | 
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| 179 | * @return string  | 
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| 180 | */  | 
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| 181 | protected function getIconMarkup($file)  | 
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| 203 | |||
| 204 | /**  | 
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| 205 | * get HTML for status icon  | 
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| 206 | *  | 
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| 207 | * @param File $record  | 
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| 208 | * @return null|string  | 
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| 209 | */  | 
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| 210 | protected function getSpecsMarkup($record)  | 
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| 221 | |||
| 222 | /**  | 
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| 223 | * Get published status flag  | 
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| 224 | *  | 
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| 225 | * @param File $record  | 
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| 226 | * @return null|string  | 
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| 227 | */  | 
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| 228 | protected function getStatusFlagMarkup($record)  | 
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| 235 | |||
| 236 | /**  | 
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| 237 | * Get user-visible "Path" for this record  | 
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| 238 | *  | 
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| 239 | * @param File $record  | 
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| 240 | * @return string  | 
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| 241 | */  | 
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| 242 | protected function getPath($record)  | 
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| 253 | |||
| 254 | /**  | 
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| 255 | * Get action for adding to campaign  | 
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| 256 | *  | 
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| 257 | * @param File $record  | 
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| 258 | * @return FormAction|null  | 
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| 259 | */  | 
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| 260 | protected function getAddToCampaignAction($record)  | 
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| 270 | |||
| 271 | /**  | 
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| 272 | * Get action for publishing  | 
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| 273 | *  | 
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| 274 | * @param File $record  | 
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| 275 | * @return FormAction  | 
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| 276 | */  | 
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| 277 | protected function getUnpublishAction($record)  | 
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| 292 | |||
| 293 | /**  | 
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| 294 | * Build popup menu  | 
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| 295 | *  | 
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| 296 | * @param File $record  | 
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| 297 | * @return PopoverField  | 
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| 298 | */  | 
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| 299 | protected function getPopoverMenu($record)  | 
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| 313 | |||
| 314 | /**  | 
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| 315 | * @param File $record  | 
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| 316 | * @return FormAction  | 
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| 317 | */  | 
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| 318 | protected function getInsertAction($record)  | 
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| 326 | }  | 
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| 327 | 
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.