Complex classes like UploadImageBehavior 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 UploadImageBehavior, and based on these observations, apply Extract Interface, too.
| 1 | <?php | ||
| 52 | class UploadImageBehavior extends UploadBehavior | ||
| 53 | { | ||
| 54 | /** | ||
| 55 | * @var string | ||
| 56 | */ | ||
| 57 | public $placeholder; | ||
| 58 | |||
| 59 | /** | ||
| 60 | * @var boolean | ||
| 61 | */ | ||
| 62 | public $createThumbsOnSave = true; | ||
| 63 | |||
| 64 | /** | ||
| 65 | * @var boolean | ||
| 66 | */ | ||
| 67 | public $createThumbsOnRequest = false; | ||
| 68 | |||
| 69 | /** | ||
| 70 | * Rotates an image automatically based on EXIF information. | ||
| 71 | * @var boolean | ||
| 72 | */ | ||
| 73 | public $autorotate = false; | ||
| 74 | |||
| 75 | /** | ||
| 76 | * Whether delete original uploaded image after thumbs generating. | ||
| 77 | * Defaults to FALSE | ||
| 78 | * @var boolean | ||
| 79 | */ | ||
| 80 | public $deleteOriginalFile = false; | ||
| 81 | |||
| 82 | /** | ||
| 83 | * @var array the thumbnail profiles | ||
| 84 | * - `width` | ||
| 85 | * - `height` | ||
| 86 | * - `quality` | ||
| 87 | */ | ||
| 88 | public $thumbs = [ | ||
| 89 | 'thumb' => ['width' => 200, 'height' => 200, 'quality' => 90], | ||
| 90 | ]; | ||
| 91 | |||
| 92 | /** | ||
| 93 | * @var string|null | ||
| 94 | */ | ||
| 95 | public $thumbPath; | ||
| 96 | |||
| 97 | /** | ||
| 98 | * @var string|null | ||
| 99 | */ | ||
| 100 | public $thumbUrl; | ||
| 101 | |||
| 102 | /** | ||
| 103 | * @var ImageInterface | ||
| 104 | */ | ||
| 105 | private $originalImage; | ||
| 106 | |||
| 107 | /** | ||
| 108 | * @inheritdoc | ||
| 109 | * @throws NotSupportedException | ||
| 110 | * @throws InvalidConfigException | ||
| 111 | */ | ||
| 112 | public function init() | ||
| 129 | |||
| 130 | /** | ||
| 131 | * @inheritdoc | ||
| 132 | * @throws InvalidConfigException | ||
| 133 | * @throws \yii\base\Exception | ||
| 134 | */ | ||
| 135 | protected function afterUpload() | ||
| 149 | |||
| 150 | /** | ||
| 151 | * @param $path | ||
| 152 | * @throws InvalidConfigException | ||
| 153 | * @throws \yii\base\Exception | ||
| 154 | */ | ||
| 155 | protected function createThumbs($path) | ||
| 175 | |||
| 176 | /** | ||
| 177 | * @param string $attribute | ||
| 178 | * @param string $profile | ||
| 179 | * @param boolean $old | ||
| 180 | * @return string | ||
| 181 | */ | ||
| 182 | public function getThumbUploadPath($attribute, $profile = 'thumb', $old = false) | ||
| 192 | |||
| 193 | /** | ||
| 194 | * @param string $attribute | ||
| 195 | * @param string $profile | ||
| 196 | * @return string|null | ||
| 197 | * @throws InvalidConfigException | ||
| 198 | * @throws \yii\base\Exception | ||
| 199 | */ | ||
| 200 | public function getThumbUploadUrl($attribute, $profile = 'thumb') | ||
| 221 | |||
| 222 | /** | ||
| 223 | * @param $profile | ||
| 224 | * @return string | ||
| 225 | * @throws InvalidConfigException | ||
| 226 | */ | ||
| 227 | protected function getPlaceholderUrl($profile) | ||
| 241 | |||
| 242 | /** | ||
| 243 | * @inheritdoc | ||
| 244 | */ | ||
| 245 | protected function delete($attribute, $old = false) | ||
| 257 | |||
| 258 | /** | ||
| 259 | * @param $filename | ||
| 260 | * @param string $profile | ||
| 261 | * @return string | ||
| 262 | */ | ||
| 263 | protected function getThumbFileName($filename, $profile = 'thumb') | ||
| 267 | |||
| 268 | /** | ||
| 269 | * @param array $config | ||
| 270 | * @param string $path | ||
| 271 | * @param string $thumbPath | ||
| 272 | * @throws InvalidConfigException | ||
| 273 | */ | ||
| 274 | protected function generateImageThumb($config, $path, $thumbPath) | ||
| 314 | |||
| 315 | /** | ||
| 316 | * @param array $config | ||
| 317 | * @param string $attribute | ||
| 318 | * @param mixed|null $default | ||
| 319 | * @return mixed | ||
| 320 | */ | ||
| 321 | private function getConfigValue($config, $attribute, $default = null) | ||
| 329 | |||
| 330 | /** | ||
| 331 | * @return bool|string | ||
| 332 | */ | ||
| 333 | private function getPathOriginalImage() | ||
| 341 | } | ||
| 342 | 
If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check:
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