Complex classes like Image 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 Image, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 17 | class Image implements \ArrayAccess |
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| 18 | {
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| 19 | /** |
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| 20 | * @var string The new image name, to be provided or will be generated. |
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| 21 | */ |
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| 22 | protected $name; |
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| 23 | |||
| 24 | /** |
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| 25 | * @var int The image width in pixels |
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| 26 | */ |
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| 27 | protected $width; |
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| 28 | |||
| 29 | /** |
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| 30 | * @var int The image height in pixels |
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| 31 | */ |
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| 32 | protected $height; |
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| 33 | |||
| 34 | /** |
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| 35 | * @var string The image mime type (extension) |
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| 36 | */ |
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| 37 | protected $mime; |
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| 38 | |||
| 39 | /** |
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| 40 | * @var string The full image path (dir + image + mime) |
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| 41 | */ |
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| 42 | protected $fullPath; |
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| 43 | |||
| 44 | /** |
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| 45 | * @var string The folder or image storage location |
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| 46 | */ |
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| 47 | protected $location; |
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| 48 | |||
| 49 | /** |
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| 50 | * @var array A json format of all information about an image |
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| 51 | */ |
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| 52 | protected $serialize = array(); |
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| 53 | |||
| 54 | /** |
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| 55 | * @var array The min and max image size allowed for upload (in bytes) |
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| 56 | */ |
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| 57 | protected $size = array(100, 500000); |
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| 58 | |||
| 59 | /** |
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| 60 | * @var array The max height and width image allowed |
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| 61 | */ |
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| 62 | protected $dimensions = array(5000, 5000); |
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| 63 | |||
| 64 | /** |
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| 65 | * @var array The mime types allowed for upload |
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| 66 | */ |
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| 67 | protected $mimeTypes = array('jpeg', 'png', 'gif', 'jpg');
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| 68 | |||
| 69 | /** |
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| 70 | * @var array list of known image types |
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| 71 | */ |
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| 72 | protected $imageMimes = array( |
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| 73 | 1 => 'gif', 'jpeg', 'png', 'swf', 'psd', |
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| 74 | 'bmp', 'tiff', 'tiff', 'jpc', 'jp2', 'jpx', |
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| 75 | 'jb2', 'swc', 'iff', 'wbmp', 'xbm', 'ico' |
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| 76 | ); |
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| 77 | /** |
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| 78 | * @var array error messages strings |
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| 79 | */ |
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| 80 | protected $common_upload_errors = array( |
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| 81 | UPLOAD_ERR_OK => '', |
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| 82 | UPLOAD_ERR_INI_SIZE => 'Image is larger than the specified amount set by the server', |
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| 83 | UPLOAD_ERR_FORM_SIZE => 'Image is larger than the specified amount specified by browser', |
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| 84 | UPLOAD_ERR_PARTIAL => 'Image could not be fully uploaded. Please try again later', |
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| 85 | UPLOAD_ERR_NO_FILE => 'Image is not found', |
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| 86 | UPLOAD_ERR_NO_TMP_DIR => 'Can\'t write to disk, due to server configuration ( No tmp dir found )', |
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| 87 | UPLOAD_ERR_CANT_WRITE => 'Failed to write file to disk. Please check you file permissions', |
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| 88 | UPLOAD_ERR_EXTENSION => 'A PHP extension has halted this file upload process' |
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| 89 | ); |
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| 90 | /** |
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| 91 | * @var array storage for the $_FILES global array |
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| 92 | */ |
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| 93 | private $_files = array(); |
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| 94 | /** |
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| 95 | * @var string storage for any errors |
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| 96 | */ |
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| 97 | private $error = ''; |
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| 98 | |||
| 99 | /** |
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| 100 | * @param array $_files represents the $_FILES array passed as dependency |
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| 101 | */ |
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| 102 | public function __construct(array $_files = array()) |
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| 112 | |||
| 113 | /** |
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| 114 | * @param mixed $offset |
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| 115 | * @param mixed $value |
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| 116 | */ |
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| 117 | public function offsetSet($offset, $value) |
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| 120 | |||
| 121 | /** |
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| 122 | * @param mixed $offset |
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| 123 | * @return null |
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| 124 | */ |
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| 125 | public function offsetExists($offset) |
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| 128 | |||
| 129 | /** |
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| 130 | * @param mixed $offset |
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| 131 | */ |
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| 132 | public function offsetUnset($offset) |
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| 135 | |||
| 136 | /** |
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| 137 | * Gets array value \ArrayAccess |
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| 138 | * |
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| 139 | * @param mixed $offset |
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| 140 | * |
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| 141 | * @return bool |
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| 142 | */ |
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| 143 | public function offsetGet($offset) |
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| 164 | |||
| 165 | /** |
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| 166 | * Checks for the common upload errors |
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| 167 | * |
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| 168 | * @param $errors int error constant |
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| 169 | * |
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| 170 | * @return string |
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| 171 | */ |
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| 172 | protected function commonUploadErrors($errors) |
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| 176 | |||
| 177 | /** |
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| 178 | * Sets acceptable max image height and width |
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| 179 | * |
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| 180 | * @param $maxWidth int max width value |
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| 181 | * @param $maxHeight int max height value |
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| 182 | * |
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| 183 | * @return $this |
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| 184 | */ |
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| 185 | public function setDimension($maxWidth, $maxHeight) |
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| 190 | |||
| 191 | /** |
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| 192 | * Returns the full path of the image ex 'location/image.mime' |
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| 193 | * |
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| 194 | * @return string |
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| 195 | */ |
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| 196 | public function getFullPath() |
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| 201 | |||
| 202 | /** |
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| 203 | * Returns the image size in bytes |
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| 204 | * |
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| 205 | * @return int |
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| 206 | */ |
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| 207 | public function getSize() |
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| 211 | |||
| 212 | /** |
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| 213 | * Define a min and max image size for uploading |
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| 214 | * |
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| 215 | * @param $min int minimum value in bytes |
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| 216 | * @param $max int maximum value in bytes |
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| 217 | * |
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| 218 | * @return $this |
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| 219 | */ |
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| 220 | public function setSize($min, $max) |
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| 225 | |||
| 226 | /** |
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| 227 | * Returns a JSON format of the image width, height, name, mime ... |
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| 228 | * |
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| 229 | * @return string |
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| 230 | */ |
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| 231 | public function getJson() |
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| 235 | |||
| 236 | /** |
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| 237 | * Returns the image mime type |
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| 238 | * |
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| 239 | * @return string |
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| 240 | */ |
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| 241 | public function getMime() |
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| 248 | |||
| 249 | /** |
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| 250 | * Define a mime type for uploading |
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| 251 | * |
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| 252 | * @param array $fileTypes |
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| 253 | * |
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| 254 | * @return $this |
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| 255 | */ |
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| 256 | public function setMime(array $fileTypes) |
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| 261 | |||
| 262 | /** |
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| 263 | * Gets the real image mime type |
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| 264 | * |
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| 265 | * @param $tmp_name string The upload tmp directory |
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| 266 | * |
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| 267 | * @return null|string |
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| 268 | */ |
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| 269 | protected function getImageMime($tmp_name) |
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| 279 | |||
| 280 | /** |
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| 281 | * Returns error string or false if no errors occurred |
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| 282 | * |
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| 283 | * @return string|bool |
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| 284 | */ |
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| 285 | public function getError() |
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| 289 | |||
| 290 | /** |
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| 291 | * This methods validates and uploads the image |
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| 292 | * @return false|Image |
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| 293 | */ |
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| 294 | public function upload() |
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| 371 | |||
| 372 | /** |
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| 373 | * Returns the image name |
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| 374 | * |
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| 375 | * @return string |
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| 376 | */ |
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| 377 | public function getName() |
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| 385 | |||
| 386 | /** |
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| 387 | * Provide image name if not provided |
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| 388 | * |
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| 389 | * @param null $isNameProvided |
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| 390 | * @return $this |
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| 391 | */ |
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| 392 | public function setName($isNameProvided = null) |
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| 400 | |||
| 401 | /** |
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| 402 | * Returns the image width |
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| 403 | * |
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| 404 | * @return int |
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| 405 | */ |
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| 406 | public function getWidth() |
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| 415 | |||
| 416 | /** |
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| 417 | * Returns the image height in pixels |
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| 418 | * |
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| 419 | * @return int |
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| 420 | */ |
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| 421 | public function getHeight() |
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| 430 | |||
| 431 | /** |
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| 432 | * Returns the storage / folder name |
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| 433 | * |
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| 434 | * @return string |
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| 435 | */ |
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| 436 | public function getLocation() |
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| 444 | |||
| 445 | /** |
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| 446 | * Creates a location for upload storage |
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| 447 | * |
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| 448 | * @param $dir string the folder name to create |
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| 449 | * @param int $permission chmod permission |
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| 450 | * |
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| 451 | * @return $this |
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| 452 | */ |
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| 453 | public function setLocation($dir = 'bulletproof', $permission = 0666) |
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| 473 | |||
| 474 | /** |
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| 475 | * Final upload method to be called, isolated for testing purposes |
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| 476 | * |
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| 477 | * @param $tmp_name int the temporary location of the image file |
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| 478 | * @param $destination int upload destination |
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| 479 | * |
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| 480 | * @return bool |
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| 481 | */ |
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| 482 | public function moveUploadedFile($tmp_name, $destination) |
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| 486 | } |
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| 487 |
This check compares the return type specified in the
@returnannotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch.