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 FileHandler 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 FileHandler, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 21 | class FileHandler extends AbstractMediaHandler  | 
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| 22 | { | 
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| 23 | /**  | 
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| 24 | * @var string  | 
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| 25 | */  | 
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| 26 | const TYPE = 'file';  | 
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| 27 | |||
| 28 | /**  | 
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| 29 | * @var string  | 
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| 30 | */  | 
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| 31 | public $mediaPath;  | 
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| 32 | |||
| 33 | /**  | 
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| 34 | * @var Filesystem  | 
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| 35 | */  | 
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| 36 | public $fileSystem;  | 
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| 37 | |||
| 38 | /**  | 
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| 39 | * @deprecated This property is deprecated since KunstmaanMediaBundle 5.7 and will be removed in KunstmaanMediaBundle 6.0. Use the `$mimeTypes` property instead.  | 
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| 40 | *  | 
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| 41 | * @var MimeTypeGuesser  | 
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| 42 | */  | 
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| 43 | public $mimeTypeGuesser;  | 
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| 44 | |||
| 45 | /**  | 
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| 46 | * @deprecated This property is deprecated since KunstmaanMediaBundle 5.7 and will be removed in KunstmaanMediaBundle 6.0. Use the `$mimeTypes` property instead.  | 
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| 47 | *  | 
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| 48 | * @var ExtensionGuesser  | 
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| 49 | */  | 
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| 50 | public $extensionGuesser;  | 
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| 51 | |||
| 52 | /** @var MimeTypesInterface */  | 
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| 53 | private $mimeTypes;  | 
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| 54 | |||
| 55 | /**  | 
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| 56 | * Files with a blacklisted extension will be converted to txt  | 
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| 57 | *  | 
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| 58 | * @var array  | 
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| 59 | */  | 
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| 60 | private $blacklistedExtensions = [];  | 
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| 61 | |||
| 62 | /**  | 
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| 63 | * @var SlugifierInterface  | 
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| 64 | */  | 
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| 65 | private $slugifier;  | 
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| 66 | |||
| 67 | /**  | 
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| 68 | * Constructor  | 
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| 69 | *  | 
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| 70 | * @param int $priority  | 
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| 71 | * @param MimeTypeGuesserFactoryInterface|MimeTypesInterface $mimeTypes  | 
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| 72 | * @param ExtensionGuesserFactoryInterface $extensionGuesserFactoryInterface  | 
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| 73 | */  | 
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| 74 | 5 | public function __construct($priority, /*MimeTypesInterface*/ $mimeTypes, ExtensionGuesserFactoryInterface $extensionGuesserFactoryInterface = null)  | 
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| 99 | |||
| 100 | /**  | 
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| 101 | * @param SlugifierInterface $slugifier  | 
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| 102 | */  | 
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| 103 | 1 | public function setSlugifier(SlugifierInterface $slugifier)  | 
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| 107 | |||
| 108 | /**  | 
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| 109 | * Inject the blacklisted  | 
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| 110 | *  | 
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| 111 | * @param array $blacklistedExtensions  | 
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| 112 | */  | 
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| 113 | public function setBlacklistedExtensions(array $blacklistedExtensions)  | 
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| 117 | |||
| 118 | /**  | 
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| 119 | * Inject the path used in media urls.  | 
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| 120 | *  | 
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| 121 | * @param string $mediaPath  | 
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| 122 | */  | 
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| 123 | public function setMediaPath($mediaPath)  | 
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| 127 | |||
| 128 | public function setFileSystem(Filesystem $fileSystem)  | 
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| 132 | |||
| 133 | /**  | 
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| 134 | * @return string  | 
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| 135 | */  | 
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| 136 | public function getName()  | 
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| 140 | |||
| 141 | /**  | 
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| 142 | * @return string  | 
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| 143 | */  | 
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| 144 | public function getType()  | 
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| 148 | |||
| 149 | /**  | 
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| 150 | * @return string  | 
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| 151 | */  | 
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| 152 | public function getFormType()  | 
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| 156 | |||
| 157 | /**  | 
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| 158 | * @param mixed $object  | 
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| 159 | *  | 
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| 160 | * @return bool  | 
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| 161 | */  | 
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| 162 | 2 | public function canHandle($object)  | 
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| 173 | |||
| 174 | /**  | 
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| 175 | * @param Media $media  | 
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| 176 | *  | 
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| 177 | * @return FileHelper  | 
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| 178 | */  | 
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| 179 | public function getFormHelper(Media $media)  | 
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| 183 | |||
| 184 | /**  | 
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| 185 | * @param Media $media  | 
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| 186 | *  | 
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| 187 | * @throws \RuntimeException when the file does not exist  | 
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| 188 | */  | 
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| 189 | 1 | public function prepareMedia(Media $media)  | 
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| 231 | |||
| 232 | /**  | 
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| 233 | * @param Media $media  | 
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| 234 | */  | 
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| 235 | public function removeMedia(Media $media)  | 
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| 258 | |||
| 259 | /**  | 
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| 260 |      * {@inheritdoc} | 
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| 261 | */  | 
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| 262 | public function updateMedia(Media $media)  | 
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| 266 | |||
| 267 | /**  | 
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| 268 | * @param Media $media  | 
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| 269 | */  | 
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| 270 | public function saveMedia(Media $media)  | 
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| 279 | |||
| 280 | /**  | 
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| 281 | * @param Media $media  | 
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| 282 | *  | 
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| 283 | * @return \Gaufrette\File  | 
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| 284 | */  | 
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| 285 | public function getOriginalFile(Media $media)  | 
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| 289 | |||
| 290 | /**  | 
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| 291 | * @param mixed $data  | 
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| 292 | *  | 
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| 293 | * @return Media  | 
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| 294 | */  | 
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| 295 | public function createNew($data)  | 
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| 315 | |||
| 316 | /**  | 
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| 317 |      * {@inheritdoc} | 
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| 318 | */  | 
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| 319 | public function getShowTemplate(Media $media)  | 
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| 323 | |||
| 324 | /**  | 
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| 325 | * @return array  | 
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| 326 | */  | 
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| 327 | public function getAddFolderActions()  | 
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| 336 | |||
| 337 | /**  | 
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| 338 | * @param Media $media  | 
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| 339 | *  | 
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| 340 | * @return string  | 
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| 341 | */  | 
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| 342 | 1 | private function getFilePath(Media $media)  | 
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| 363 | |||
| 364 | /**  | 
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| 365 | * @param Media $media  | 
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| 366 | *  | 
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| 367 | * @return string  | 
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| 368 | */  | 
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| 369 | private function getFileFolderPath(Media $media)  | 
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| 373 | |||
| 374 | 1 | private function guessMimeType($pathName)  | 
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| 383 | |||
| 384 | View Code Duplication | private function getExtensions($mimeType)  | 
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| 393 | }  | 
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| 394 | 
This check looks for
@paramannotations where the type inferred by our type inference engine differs from the declared type.It makes a suggestion as to what type it considers more descriptive.
Most often this is a case of a parameter that can be null in addition to its declared types.