Complex classes like ShowPage 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 ShowPage, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 25 | class ShowPage extends SymfonyPage implements ShowPageInterface  | 
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| 26 | { | 
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| 27 | /**  | 
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| 28 | * @var TableAccessorInterface  | 
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| 29 | */  | 
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| 30 | private $tableAccessor;  | 
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| 31 | |||
| 32 | /**  | 
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| 33 | * @param Session $session  | 
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| 34 | * @param array $parameters  | 
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| 35 | * @param RouterInterface $router  | 
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| 36 | * @param TableAccessorInterface $tableAccessor  | 
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| 37 | */  | 
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| 38 | public function __construct(  | 
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| 48 | |||
| 49 | /**  | 
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| 50 |      * {@inheritdoc} | 
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| 51 | */  | 
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| 52 | public function hasCustomer($customerName)  | 
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| 58 | |||
| 59 | /**  | 
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| 60 |      * {@inheritdoc} | 
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| 61 | */  | 
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| 62 | public function hasShippingAddress($customerName, $street, $postcode, $city, $countryName)  | 
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| 68 | |||
| 69 | /**  | 
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| 70 |      * {@inheritdoc} | 
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| 71 | */  | 
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| 72 | public function hasBillingAddress($customerName, $street, $postcode, $city, $countryName)  | 
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| 78 | |||
| 79 | /**  | 
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| 80 |      * {@inheritdoc} | 
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| 81 | */  | 
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| 82 | public function hasShipment($shippingDetails)  | 
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| 88 | |||
| 89 | public function specifyTrackingCode($code)  | 
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| 93 | |||
| 94 | public function canShipOrder(OrderInterface $order)  | 
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| 98 | |||
| 99 | public function shipOrder(OrderInterface $order)  | 
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| 103 | |||
| 104 | /**  | 
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| 105 |      * {@inheritdoc} | 
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| 106 | */  | 
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| 107 | public function hasPayment($paymentDetails)  | 
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| 113 | |||
| 114 | /**  | 
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| 115 |      * {@inheritdoc} | 
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| 116 | */  | 
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| 117 | public function canCompleteOrderLastPayment(OrderInterface $order)  | 
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| 121 | |||
| 122 | /**  | 
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| 123 |      * {@inheritdoc} | 
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| 124 | */  | 
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| 125 | public function completeOrderLastPayment(OrderInterface $order)  | 
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| 129 | |||
| 130 | /**  | 
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| 131 |      * {@inheritdoc} | 
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| 132 | */  | 
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| 133 | public function refundOrderLastPayment(OrderInterface $order)  | 
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| 137 | |||
| 138 | /**  | 
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| 139 |      * {@inheritdoc} | 
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| 140 | */  | 
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| 141 | public function countItems()  | 
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| 145 | |||
| 146 | /**  | 
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| 147 |      * {@inheritdoc} | 
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| 148 | */  | 
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| 149 | public function isProductInTheList($productName)  | 
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| 163 | |||
| 164 | /**  | 
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| 165 |      * {@inheritdoc} | 
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| 166 | */  | 
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| 167 | public function getItemsTotal()  | 
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| 173 | |||
| 174 | /**  | 
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| 175 |      * {@inheritdoc} | 
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| 176 | */  | 
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| 177 | public function getTotal()  | 
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| 183 | |||
| 184 | /**  | 
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| 185 |      * {@inheritdoc} | 
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| 186 | */  | 
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| 187 | public function getShippingTotal()  | 
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| 193 | |||
| 194 | /**  | 
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| 195 |      * {@inheritdoc} | 
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| 196 | */  | 
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| 197 | public function getTaxTotal()  | 
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| 203 | |||
| 204 | /**  | 
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| 205 |      * {@inheritdoc} | 
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| 206 | */  | 
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| 207 | public function hasShippingCharge($shippingCharge)  | 
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| 213 | |||
| 214 | /**  | 
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| 215 |      * {@inheritdoc} | 
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| 216 | */  | 
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| 217 | public function getPromotionTotal()  | 
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| 223 | |||
| 224 | /**  | 
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| 225 |      * {@inheritdoc} | 
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| 226 | */  | 
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| 227 | public function hasPromotionDiscount($promotionDiscount)  | 
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| 233 | |||
| 234 | /**  | 
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| 235 |      * {@inheritdoc} | 
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| 236 | */  | 
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| 237 | public function hasTax($tax)  | 
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| 243 | |||
| 244 | /**  | 
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| 245 |      * {@inheritdoc} | 
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| 246 | */  | 
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| 247 | public function getItemCode($itemName)  | 
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| 251 | |||
| 252 | /**  | 
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| 253 |      * {@inheritdoc} | 
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| 254 | */  | 
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| 255 | public function getItemUnitPrice($itemName)  | 
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| 259 | |||
| 260 | /**  | 
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| 261 |      * {@inheritdoc} | 
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| 262 | */  | 
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| 263 | public function getItemDiscountedUnitPrice($itemName)  | 
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| 267 | |||
| 268 | /**  | 
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| 269 |      * {@inheritdoc} | 
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| 270 | */  | 
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| 271 | public function getItemQuantity($itemName)  | 
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| 275 | |||
| 276 | /**  | 
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| 277 |      * {@inheritdoc} | 
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| 278 | */  | 
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| 279 | public function getItemSubtotal($itemName)  | 
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| 283 | |||
| 284 | /**  | 
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| 285 |      * {@inheritdoc} | 
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| 286 | */  | 
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| 287 | public function getItemDiscount($itemName)  | 
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| 291 | |||
| 292 | /**  | 
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| 293 |      * {@inheritdoc} | 
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| 294 | */  | 
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| 295 | public function getItemTax($itemName)  | 
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| 299 | |||
| 300 | /**  | 
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| 301 |      * {@inheritdoc} | 
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| 302 | */  | 
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| 303 | public function getItemTotal($itemName)  | 
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| 307 | |||
| 308 | /**  | 
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| 309 |      * {@inheritdoc} | 
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| 310 | */  | 
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| 311 | public function getPaymentAmount()  | 
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| 317 | |||
| 318 | /**  | 
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| 319 |      * {@inheritdoc} | 
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| 320 | */  | 
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| 321 | public function getPaymentsCount()  | 
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| 327 | |||
| 328 | /**  | 
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| 329 |      * {@inheritdoc} | 
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| 330 | */  | 
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| 331 | public function hasCancelButton()  | 
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| 335 | |||
| 336 | /**  | 
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| 337 |      * {@inheritdoc} | 
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| 338 | */  | 
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| 339 | public function getOrderState()  | 
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| 343 | |||
| 344 | /**  | 
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| 345 |      * {@inheritdoc} | 
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| 346 | */  | 
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| 347 | public function getPaymentState()  | 
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| 351 | |||
| 352 | public function cancelOrder()  | 
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| 356 | |||
| 357 | public function deleteOrder()  | 
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| 361 | |||
| 362 | /**  | 
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| 363 |      * {@inheritdoc} | 
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| 364 | */  | 
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| 365 | public function hasNote($note)  | 
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| 371 | |||
| 372 | /**  | 
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| 373 |      * {@inheritdoc} | 
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| 374 | */  | 
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| 375 | public function hasShippingProvinceName($provinceName)  | 
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| 381 | |||
| 382 | /**  | 
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| 383 |      * {@inheritdoc} | 
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| 384 | */  | 
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| 385 | public function hasBillingProvinceName($provinceName)  | 
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| 391 | |||
| 392 | /**  | 
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| 393 |      * {@inheritdoc} | 
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| 394 | */  | 
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| 395 | public function getIpAddressAssigned()  | 
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| 399 | |||
| 400 | /**  | 
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| 401 |      * {@inheritdoc} | 
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| 402 | */  | 
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| 403 | public function getOrderCurrency()  | 
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| 407 | |||
| 408 | /**  | 
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| 409 |      * {@inheritdoc} | 
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| 410 | */  | 
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| 411 | public function getRouteName()  | 
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| 415 | |||
| 416 | /**  | 
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| 417 |      * {@inheritdoc} | 
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| 418 | */  | 
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| 419 | protected function getDefinedElements()  | 
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| 443 | |||
| 444 | /**  | 
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| 445 | * @return TableAccessorInterface  | 
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| 446 | */  | 
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| 447 | protected function getTableAccessor()  | 
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| 451 | |||
| 452 | /**  | 
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| 453 | * @param string $elementText  | 
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| 454 | * @param string $customerName  | 
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| 455 | * @param string $street  | 
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| 456 | * @param string $postcode  | 
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| 457 | * @param string $city  | 
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| 458 | * @param string $countryName  | 
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| 459 | *  | 
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| 460 | * @return bool  | 
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| 461 | */  | 
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| 462 | private function hasAddress($elementText, $customerName, $street, $postcode, $city, $countryName)  | 
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| 471 | |||
| 472 | /**  | 
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| 473 | * @param string $itemName  | 
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| 474 | * @param string $property  | 
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| 475 | *  | 
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| 476 | * @return string  | 
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| 477 | */  | 
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| 478 | private function getItemProperty($itemName, $property)  | 
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| 487 | |||
| 488 | /**  | 
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| 489 | * @param OrderInterface $order  | 
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| 490 | *  | 
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| 491 | * @return NodeElement|null  | 
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| 492 | */  | 
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| 493 | private function getLastOrderPaymentElement(OrderInterface $order)  | 
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| 502 | |||
| 503 | /**  | 
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| 504 | * @param OrderInterface $order  | 
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| 505 | *  | 
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| 506 | * @return NodeElement|null  | 
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| 507 | */  | 
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| 508 | private function getLastOrderShipmentElement(OrderInterface $order)  | 
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| 517 | }  | 
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| 518 | 
Very long variable names usually make code harder to read. It is therefore recommended not to make variable names too verbose.