Complex classes like WebDAVAdapter 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 WebDAVAdapter, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
            ||
| 18 | class WebDAVAdapter extends AbstractAdapter  | 
            ||
| 19 | { | 
            ||
| 20 | use StreamedReadingTrait;  | 
            ||
| 21 |     use StreamedCopyTrait { | 
            ||
| 22 | StreamedCopyTrait::copy as streamedCopy;  | 
            ||
| 23 | }  | 
            ||
| 24 | use NotSupportingVisibilityTrait;  | 
            ||
| 25 | |||
| 26 | /**  | 
            ||
| 27 | * @var array  | 
            ||
| 28 | */  | 
            ||
| 29 | protected static $resultMap = [  | 
            ||
| 30 |         '{DAV:}getcontentlength' => 'size', | 
            ||
| 31 |         '{DAV:}getcontenttype' => 'mimetype', | 
            ||
| 32 | 'content-length' => 'size',  | 
            ||
| 33 | 'content-type' => 'mimetype',  | 
            ||
| 34 | ];  | 
            ||
| 35 | |||
| 36 | /**  | 
            ||
| 37 | * @var Client  | 
            ||
| 38 | */  | 
            ||
| 39 | protected $client;  | 
            ||
| 40 | |||
| 41 | /**  | 
            ||
| 42 | * @var bool  | 
            ||
| 43 | */  | 
            ||
| 44 | protected $useStreamedCopy = true;  | 
            ||
| 45 | |||
| 46 | /**  | 
            ||
| 47 | * Constructor.  | 
            ||
| 48 | *  | 
            ||
| 49 | * @param Client $client  | 
            ||
| 50 | * @param string $prefix  | 
            ||
| 51 | * @param bool $useStreamedCopy  | 
            ||
| 52 | */  | 
            ||
| 53 | public function __construct(Client $client, $prefix = null, $useStreamedCopy = true)  | 
            ||
| 59 | |||
| 60 | /**  | 
            ||
| 61 | * url encode a path  | 
            ||
| 62 | *  | 
            ||
| 63 | * @param string $path  | 
            ||
| 64 | *  | 
            ||
| 65 | * @return string  | 
            ||
| 66 | */  | 
            ||
| 67 | protected function encodePath($path)  | 
            ||
| 75 | |||
| 76 | /**  | 
            ||
| 77 |      * {@inheritdoc} | 
            ||
| 78 | */  | 
            ||
| 79 | public function getMetadata($path)  | 
            ||
| 98 | |||
| 99 | /**  | 
            ||
| 100 |      * {@inheritdoc} | 
            ||
| 101 | */  | 
            ||
| 102 | public function has($path)  | 
            ||
| 106 | |||
| 107 | /**  | 
            ||
| 108 |      * {@inheritdoc} | 
            ||
| 109 | */  | 
            ||
| 110 | public function read($path)  | 
            ||
| 132 | |||
| 133 | /**  | 
            ||
| 134 |      * {@inheritdoc} | 
            ||
| 135 | */  | 
            ||
| 136 | public function write($path, $contents, Config $config)  | 
            ||
| 157 | |||
| 158 | /**  | 
            ||
| 159 |      * {@inheritdoc} | 
            ||
| 160 | */  | 
            ||
| 161 | public function writeStream($path, $resource, Config $config)  | 
            ||
| 165 | |||
| 166 | /**  | 
            ||
| 167 |      * {@inheritdoc} | 
            ||
| 168 | */  | 
            ||
| 169 | public function update($path, $contents, Config $config)  | 
            ||
| 173 | |||
| 174 | /**  | 
            ||
| 175 |      * {@inheritdoc} | 
            ||
| 176 | */  | 
            ||
| 177 | public function updateStream($path, $resource, Config $config)  | 
            ||
| 181 | |||
| 182 | /**  | 
            ||
| 183 |      * {@inheritdoc} | 
            ||
| 184 | */  | 
            ||
| 185 | public function rename($path, $newpath)  | 
            ||
| 204 | |||
| 205 | /**  | 
            ||
| 206 |      * {@inheritdoc} | 
            ||
| 207 | */  | 
            ||
| 208 | public function copy($path, $newpath)  | 
            ||
| 216 | |||
| 217 | /**  | 
            ||
| 218 |      * {@inheritdoc} | 
            ||
| 219 | */  | 
            ||
| 220 | public function delete($path)  | 
            ||
| 232 | |||
| 233 | /**  | 
            ||
| 234 |      * {@inheritdoc} | 
            ||
| 235 | */  | 
            ||
| 236 | public function createDir($path, Config $config)  | 
            ||
| 264 | |||
| 265 | /**  | 
            ||
| 266 |      * {@inheritdoc} | 
            ||
| 267 | */  | 
            ||
| 268 | public function deleteDir($dirname)  | 
            ||
| 272 | |||
| 273 | /**  | 
            ||
| 274 |      * {@inheritdoc} | 
            ||
| 275 | */  | 
            ||
| 276 | public function listContents($directory = '', $recursive = false)  | 
            ||
| 301 | |||
| 302 | /**  | 
            ||
| 303 |      * {@inheritdoc} | 
            ||
| 304 | */  | 
            ||
| 305 | public function getSize($path)  | 
            ||
| 309 | |||
| 310 | /**  | 
            ||
| 311 |      * {@inheritdoc} | 
            ||
| 312 | */  | 
            ||
| 313 | public function getTimestamp($path)  | 
            ||
| 317 | |||
| 318 | /**  | 
            ||
| 319 |      * {@inheritdoc} | 
            ||
| 320 | */  | 
            ||
| 321 | public function getMimetype($path)  | 
            ||
| 325 | |||
| 326 | /**  | 
            ||
| 327 | * @return boolean  | 
            ||
| 328 | */  | 
            ||
| 329 | public function getUseStreamedCopy()  | 
            ||
| 333 | |||
| 334 | /**  | 
            ||
| 335 | * @param boolean $useStreamedCopy  | 
            ||
| 336 | */  | 
            ||
| 337 | public function setUseStreamedCopy($useStreamedCopy)  | 
            ||
| 341 | |||
| 342 | /**  | 
            ||
| 343 | * Copy a file through WebDav COPY method.  | 
            ||
| 344 | *  | 
            ||
| 345 | * @param string $path  | 
            ||
| 346 | * @param string $newPath  | 
            ||
| 347 | *  | 
            ||
| 348 | * @return bool  | 
            ||
| 349 | */  | 
            ||
| 350 | protected function nativeCopy($path, $newPath)  | 
            ||
| 374 | |||
| 375 | /**  | 
            ||
| 376 | * Normalise a WebDAV repsonse object.  | 
            ||
| 377 | *  | 
            ||
| 378 | * @param array $object  | 
            ||
| 379 | * @param string $path  | 
            ||
| 380 | *  | 
            ||
| 381 | * @return array  | 
            ||
| 382 | */  | 
            ||
| 383 | protected function normalizeObject(array $object, $path)  | 
            ||
| 400 | }  | 
            ||
| 401 | 
If the size of the collection does not change during the iteration, it is generally a good practice to compute it beforehand, and not on each iteration: