Complex classes like Adjustment 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 Adjustment, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 17 | class Adjustment implements AdjustmentInterface  | 
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| 18 | { | 
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| 19 | /**  | 
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| 20 | * @var mixed  | 
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| 21 | */  | 
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| 22 | protected $id;  | 
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| 23 | |||
| 24 | /**  | 
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| 25 | * @var OrderInterface  | 
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| 26 | */  | 
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| 27 | protected $order;  | 
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| 28 | |||
| 29 | /**  | 
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| 30 | * @var OrderItemInterface  | 
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| 31 | */  | 
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| 32 | protected $orderItem;  | 
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| 33 | |||
| 34 | /**  | 
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| 35 | * @var OrderItemUnitInterface  | 
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| 36 | */  | 
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| 37 | protected $orderItemUnit;  | 
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| 38 | |||
| 39 | /**  | 
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| 40 | * @var string  | 
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| 41 | */  | 
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| 42 | protected $type;  | 
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| 43 | |||
| 44 | /**  | 
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| 45 | * @var string  | 
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| 46 | */  | 
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| 47 | protected $description;  | 
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| 48 | |||
| 49 | /**  | 
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| 50 | * @var int  | 
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| 51 | */  | 
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| 52 | protected $amount = 0;  | 
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| 53 | |||
| 54 | /**  | 
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| 55 | * Is adjustment neutral?  | 
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| 56 | * Should it modify the order total?  | 
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| 57 | *  | 
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| 58 | * @var bool  | 
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| 59 | */  | 
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| 60 | protected $neutral = false;  | 
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| 61 | |||
| 62 | /**  | 
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| 63 | * @var bool  | 
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| 64 | */  | 
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| 65 | protected $locked = false;  | 
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| 66 | |||
| 67 | /**  | 
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| 68 | * @var int  | 
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| 69 | */  | 
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| 70 | protected $originId;  | 
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| 71 | |||
| 72 | /**  | 
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| 73 | * @var string  | 
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| 74 | */  | 
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| 75 | protected $originType;  | 
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| 76 | |||
| 77 | /**  | 
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| 78 | * @var \DateTime  | 
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| 79 | */  | 
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| 80 | protected $createdAt;  | 
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| 81 | |||
| 82 | /**  | 
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| 83 | * @var \DateTime  | 
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| 84 | */  | 
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| 85 | protected $updatedAt;  | 
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| 86 | |||
| 87 | public function __construct()  | 
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| 91 | |||
| 92 | /**  | 
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| 93 |      * {@inheritdoc} | 
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| 94 | */  | 
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| 95 | public function getId()  | 
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| 99 | |||
| 100 | /**  | 
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| 101 |      * {@inheritdoc} | 
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| 102 | */  | 
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| 103 | public function getAdjustable()  | 
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| 119 | |||
| 120 | /**  | 
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| 121 |      * {@inheritdoc} | 
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| 122 | */  | 
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| 123 | public function setAdjustable(AdjustableInterface $adjustable = null)  | 
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| 144 | |||
| 145 | /**  | 
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| 146 |      * {@inheritdoc} | 
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| 147 | */  | 
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| 148 | public function getType()  | 
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| 152 | |||
| 153 | /**  | 
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| 154 |      * {@inheritdoc} | 
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| 155 | */  | 
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| 156 | public function setType($type)  | 
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| 160 | |||
| 161 | /**  | 
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| 162 |      * {@inheritdoc} | 
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| 163 | */  | 
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| 164 | public function getDescription()  | 
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| 168 | |||
| 169 | /**  | 
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| 170 |      * {@inheritdoc} | 
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| 171 | */  | 
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| 172 | public function setDescription($description)  | 
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| 176 | |||
| 177 | /**  | 
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| 178 |      * {@inheritdoc} | 
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| 179 | */  | 
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| 180 | public function getAmount()  | 
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| 184 | |||
| 185 | /**  | 
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| 186 |      * {@inheritdoc} | 
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| 187 | */  | 
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| 188 | public function setAmount($amount)  | 
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| 199 | |||
| 200 | /**  | 
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| 201 |      * {@inheritdoc} | 
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| 202 | */  | 
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| 203 | public function isNeutral()  | 
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| 207 | |||
| 208 | /**  | 
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| 209 |      * {@inheritdoc} | 
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| 210 | */  | 
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| 211 | public function setNeutral($neutral)  | 
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| 220 | |||
| 221 | /**  | 
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| 222 |      * {@inheritdoc} | 
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| 223 | */  | 
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| 224 | public function isLocked()  | 
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| 228 | |||
| 229 | /**  | 
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| 230 |      * {@inheritdoc} | 
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| 231 | */  | 
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| 232 | public function lock()  | 
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| 236 | |||
| 237 | /**  | 
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| 238 |      * {@inheritdoc} | 
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| 239 | */  | 
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| 240 | public function unlock()  | 
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| 244 | |||
| 245 | /**  | 
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| 246 |      * {@inheritdoc} | 
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| 247 | */  | 
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| 248 | public function isCharge()  | 
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| 252 | |||
| 253 | /**  | 
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| 254 |      * {@inheritdoc} | 
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| 255 | */  | 
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| 256 | public function isCredit()  | 
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| 260 | |||
| 261 | /**  | 
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| 262 |      * {@inheritdoc} | 
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| 263 | */  | 
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| 264 | public function getOriginId()  | 
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| 268 | |||
| 269 | /**  | 
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| 270 |      * {@inheritdoc} | 
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| 271 | */  | 
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| 272 | public function setOriginId($originId)  | 
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| 276 | |||
| 277 | /**  | 
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| 278 |      * {@inheritdoc} | 
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| 279 | */  | 
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| 280 | public function getOriginType()  | 
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| 284 | |||
| 285 | /**  | 
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| 286 |      * {@inheritdoc} | 
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| 287 | */  | 
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| 288 | public function setOriginType($originType)  | 
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| 292 | |||
| 293 | /**  | 
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| 294 |      * {@inheritdoc} | 
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| 295 | */  | 
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| 296 | public function getCreatedAt()  | 
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| 300 | |||
| 301 | /**  | 
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| 302 |      * {@inheritdoc} | 
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| 303 | */  | 
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| 304 | public function setCreatedAt(\DateTime $createdAt)  | 
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| 308 | |||
| 309 | /**  | 
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| 310 |      * {@inheritdoc} | 
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| 311 | */  | 
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| 312 | public function getUpdatedAt()  | 
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| 316 | |||
| 317 | /**  | 
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| 318 |      * {@inheritdoc} | 
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| 319 | */  | 
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| 320 | public function setUpdatedAt(\DateTime $updatedAt)  | 
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| 324 | |||
| 325 | private function recalculateAdjustable()  | 
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| 332 | |||
| 333 | /**  | 
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| 334 | * @param AdjustableInterface $adjustable  | 
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| 335 | *  | 
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| 336 | * @throws \InvalidArgumentException when adjustable class is not supported  | 
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| 337 | */  | 
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| 338 | private function assignAdjustable(AdjustableInterface $adjustable)  | 
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| 350 | |||
| 351 | /**  | 
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| 352 | * @throws \LogicException when adjustment is locked  | 
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| 353 | */  | 
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| 354 | private function assertNotLocked()  | 
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| 360 | }  | 
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| 361 |