Complex classes like Addon 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 Addon, and based on these observations, apply Extract Interface, too.
| 1 | <?php namespace Anomaly\Streams\Platform\Addon; |
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| 16 | class Addon implements PresentableInterface, Arrayable |
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| 17 | { |
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| 18 | |||
| 19 | use FiresCallbacks; |
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| 20 | use DispatchesJobs; |
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| 21 | |||
| 22 | /** |
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| 23 | * Runtime cache. |
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| 24 | * |
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| 25 | * @var array |
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| 26 | */ |
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| 27 | protected $cache = []; |
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| 28 | |||
| 29 | /** |
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| 30 | * The addon path. |
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| 31 | * |
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| 32 | * @var string |
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| 33 | */ |
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| 34 | protected $path = null; |
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| 35 | |||
| 36 | /** |
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| 37 | * The addon type. |
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| 38 | * |
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| 39 | * @var string |
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| 40 | */ |
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| 41 | protected $type = null; |
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| 42 | |||
| 43 | /** |
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| 44 | * The addon slug. |
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| 45 | * |
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| 46 | * @var string |
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| 47 | */ |
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| 48 | protected $slug = null; |
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| 49 | |||
| 50 | /** |
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| 51 | * The addon vendor. |
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| 52 | * |
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| 53 | * @var string |
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| 54 | */ |
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| 55 | protected $vendor = null; |
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| 56 | |||
| 57 | /** |
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| 58 | * The addon namespace. |
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| 59 | * |
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| 60 | * @var null|string |
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| 61 | */ |
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| 62 | protected $namespace = null; |
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| 63 | |||
| 64 | /** |
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| 65 | * Get the addon's presenter. |
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| 66 | * |
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| 67 | * @return Presenter |
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| 68 | */ |
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| 69 | public function getPresenter() |
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| 73 | |||
| 74 | /** |
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| 75 | * Return a new service provider. |
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| 76 | * |
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| 77 | * @return AddonServiceProvider |
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| 78 | */ |
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| 79 | public function newServiceProvider() |
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| 83 | |||
| 84 | /** |
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| 85 | * Get the service provider class. |
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| 86 | * |
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| 87 | * @return string |
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| 88 | */ |
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| 89 | public function getServiceProvider() |
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| 93 | |||
| 94 | /** |
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| 95 | * Return whether the addon is core or not. |
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| 96 | * |
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| 97 | * @return bool |
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| 98 | */ |
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| 99 | public function isCore() |
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| 103 | |||
| 104 | /** |
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| 105 | * Return whether the addon is shared or not. |
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| 106 | * |
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| 107 | * @return bool |
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| 108 | */ |
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| 109 | public function isShared() |
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| 113 | |||
| 114 | /** |
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| 115 | * Return whether the addon is for testing or not. |
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| 116 | * |
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| 117 | * @return bool |
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| 118 | */ |
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| 119 | public function isTesting() |
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| 123 | |||
| 124 | /** |
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| 125 | * Get the addon name string. |
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| 126 | * |
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| 127 | * @return string |
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| 128 | */ |
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| 129 | public function getName() |
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| 133 | |||
| 134 | /** |
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| 135 | * Get the addon title string. |
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| 136 | * |
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| 137 | * @return string |
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| 138 | */ |
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| 139 | public function getTitle() |
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| 143 | |||
| 144 | /** |
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| 145 | * Get the addon description string. |
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| 146 | * |
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| 147 | * @return string |
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| 148 | */ |
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| 149 | public function getDescription() |
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| 153 | |||
| 154 | /** |
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| 155 | * Get a namespaced key string. |
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| 156 | * |
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| 157 | * @param null $key |
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| 158 | * @return string |
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| 159 | */ |
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| 160 | public function getNamespace($key = null) |
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| 168 | |||
| 169 | /** |
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| 170 | * Get the transformed |
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| 171 | * class to another suffix. |
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| 172 | * |
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| 173 | * @param null $suffix |
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| 174 | * @return string |
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| 175 | */ |
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| 176 | public function getTransformedClass($suffix = null) |
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| 182 | |||
| 183 | /** |
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| 184 | * Return the ID representation (namespace). |
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| 185 | * |
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| 186 | * @return string |
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| 187 | */ |
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| 188 | public function getId() |
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| 192 | |||
| 193 | /** |
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| 194 | * Return whether an addon has |
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| 195 | * config matching the key. |
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| 196 | * |
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| 197 | * @param string $key |
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| 198 | * @return boolean |
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| 199 | */ |
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| 200 | public function hasConfig($key = '*') |
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| 204 | |||
| 205 | /** |
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| 206 | * Return whether an addon has |
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| 207 | * config matching any key. |
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| 208 | * |
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| 209 | * @param array $keys |
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| 210 | * @return bool |
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| 211 | */ |
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| 212 | public function hasAnyConfig(array $keys = ['*']) |
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| 222 | |||
| 223 | /** |
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| 224 | * Get the composer json contents. |
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| 225 | * |
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| 226 | * @return mixed|null |
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| 227 | */ |
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| 228 | public function getComposerJson() |
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| 238 | |||
| 239 | /** |
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| 240 | * @param $path |
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| 241 | * @return $this |
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| 242 | */ |
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| 243 | public function setPath($path) |
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| 249 | |||
| 250 | /** |
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| 251 | * Get the addon path. |
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| 252 | * |
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| 253 | * @return string |
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| 254 | */ |
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| 255 | public function getPath($path = null) |
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| 259 | |||
| 260 | /** |
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| 261 | * Return the app path. |
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| 262 | * |
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| 263 | * @param null $path |
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| 264 | */ |
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| 265 | public function getAppPath($path = null) |
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| 269 | |||
| 270 | /** |
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| 271 | * Set the addon slug. |
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| 272 | * |
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| 273 | * @param $slug |
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| 274 | * @return $this |
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| 275 | */ |
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| 276 | public function setSlug($slug) |
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| 282 | |||
| 283 | /** |
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| 284 | * Get the addon slug. |
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| 285 | * |
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| 286 | * @return string |
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| 287 | */ |
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| 288 | public function getSlug() |
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| 292 | |||
| 293 | /** |
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| 294 | * Set the addon type. |
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| 295 | * |
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| 296 | * @param $type |
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| 297 | * @return $this |
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| 298 | */ |
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| 299 | public function setType($type) |
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| 305 | |||
| 306 | /** |
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| 307 | * Get the addon type. |
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| 308 | * |
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| 309 | * @return string |
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| 310 | */ |
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| 311 | public function getType() |
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| 315 | |||
| 316 | /** |
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| 317 | * Set the vendor. |
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| 318 | * |
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| 319 | * @param $vendor |
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| 320 | * @return $this |
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| 321 | */ |
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| 322 | public function setVendor($vendor) |
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| 328 | |||
| 329 | /** |
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| 330 | * Get the vendor. |
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| 331 | * |
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| 332 | * @return string |
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| 333 | */ |
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| 334 | public function getVendor() |
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| 338 | |||
| 339 | /** |
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| 340 | * Make the addon namespace. |
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| 341 | */ |
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| 342 | protected function makeNamespace() |
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| 346 | |||
| 347 | /** |
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| 348 | * Get a property value from the object. |
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| 349 | * |
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| 350 | * @param $name |
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| 351 | * @return mixed |
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| 352 | */ |
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| 353 | public function __get($name) |
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| 369 | |||
| 370 | /** |
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| 371 | * Return whether a property is set or not. |
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| 372 | * |
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| 373 | * @param $name |
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| 374 | * @return bool |
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| 375 | */ |
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| 376 | public function __isset($name) |
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| 392 | |||
| 393 | /** |
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| 394 | * Return the addon as a string. |
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| 395 | * |
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| 396 | * @return string |
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| 397 | */ |
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| 398 | public function __toString() |
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| 402 | |||
| 403 | /** |
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| 404 | * Get the instance as an array. |
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| 405 | * |
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| 406 | * @return array |
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| 407 | */ |
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| 408 | public function toArray() |
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| 417 | } |
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| 418 |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: