Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like API 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 API, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
            ||
| 34 | class API extends AbstractAPI  | 
            ||
| 35 | { | 
            ||
| 36 | /**  | 
            ||
| 37 | * Merchant instance.  | 
            ||
| 38 | *  | 
            ||
| 39 | * @var Merchant  | 
            ||
| 40 | */  | 
            ||
| 41 | protected $merchant;  | 
            ||
| 42 | |||
| 43 | /**  | 
            ||
| 44 | * Sandbox box mode.  | 
            ||
| 45 | *  | 
            ||
| 46 | * @var bool  | 
            ||
| 47 | */  | 
            ||
| 48 | protected $sandboxEnabled = false;  | 
            ||
| 49 | |||
| 50 | /**  | 
            ||
| 51 | * Sandbox sign key.  | 
            ||
| 52 | *  | 
            ||
| 53 | * @var string  | 
            ||
| 54 | */  | 
            ||
| 55 | protected $sandboxSignKey;  | 
            ||
| 56 | |||
| 57 | /**  | 
            ||
| 58 | * Cache.  | 
            ||
| 59 | *  | 
            ||
| 60 | * @var Cache  | 
            ||
| 61 | */  | 
            ||
| 62 | protected $cache;  | 
            ||
| 63 | |||
| 64 | const API_HOST = 'https://api.mch.weixin.qq.com';  | 
            ||
| 65 | |||
| 66 | // api  | 
            ||
| 67 | const API_PAY_ORDER = '/pay/micropay';  | 
            ||
| 68 | const API_PREPARE_ORDER = '/pay/unifiedorder';  | 
            ||
| 69 | const API_QUERY = '/pay/orderquery';  | 
            ||
| 70 | const API_CLOSE = '/pay/closeorder';  | 
            ||
| 71 | const API_REVERSE = '/secapi/pay/reverse';  | 
            ||
| 72 | const API_REFUND = '/secapi/pay/refund';  | 
            ||
| 73 | const API_QUERY_REFUND = '/pay/refundquery';  | 
            ||
| 74 | const API_DOWNLOAD_BILL = '/pay/downloadbill';  | 
            ||
| 75 | const API_REPORT = '/payitil/report';  | 
            ||
| 76 | |||
| 77 | const API_URL_SHORTEN = 'https://api.mch.weixin.qq.com/tools/shorturl';  | 
            ||
| 78 | const API_AUTH_CODE_TO_OPENID = 'https://api.mch.weixin.qq.com/tools/authcodetoopenid';  | 
            ||
| 79 | const API_SANDBOX_SIGN_KEY = 'https://api.mch.weixin.qq.com/sandboxnew/pay/getsignkey';  | 
            ||
| 80 | |||
| 81 | // order id types.  | 
            ||
| 82 | const TRANSACTION_ID = 'transaction_id';  | 
            ||
| 83 | const OUT_TRADE_NO = 'out_trade_no';  | 
            ||
| 84 | const OUT_REFUND_NO = 'out_refund_no';  | 
            ||
| 85 | const REFUND_ID = 'refund_id';  | 
            ||
| 86 | |||
| 87 | // bill types.  | 
            ||
| 88 | const BILL_TYPE_ALL = 'ALL';  | 
            ||
| 89 | const BILL_TYPE_SUCCESS = 'SUCCESS';  | 
            ||
| 90 | const BILL_TYPE_REFUND = 'REFUND';  | 
            ||
| 91 | const BILL_TYPE_REVOKED = 'REVOKED';  | 
            ||
| 92 | |||
| 93 | /**  | 
            ||
| 94 | * API constructor.  | 
            ||
| 95 | *  | 
            ||
| 96 | * @param \EasyWeChat\Payment\Merchant $merchant  | 
            ||
| 97 | * @param \EasyWeChat\Payment\Cache|null $cache  | 
            ||
| 98 | */  | 
            ||
| 99 | 12 | public function __construct(Merchant $merchant, Cache $cache = null)  | 
            |
| 104 | |||
| 105 | /**  | 
            ||
| 106 | * Pay the order.  | 
            ||
| 107 | *  | 
            ||
| 108 | * @param Order $order  | 
            ||
| 109 | *  | 
            ||
| 110 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 111 | */  | 
            ||
| 112 | 1 | public function pay(Order $order)  | 
            |
| 116 | |||
| 117 | /**  | 
            ||
| 118 | * Prepare order to pay.  | 
            ||
| 119 | *  | 
            ||
| 120 | * @param Order $order  | 
            ||
| 121 | *  | 
            ||
| 122 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 123 | */  | 
            ||
| 124 | 1 | public function prepare(Order $order)  | 
            |
| 133 | |||
| 134 | /**  | 
            ||
| 135 | * Query order.  | 
            ||
| 136 | *  | 
            ||
| 137 | * @param string $orderNo  | 
            ||
| 138 | * @param string $type  | 
            ||
| 139 | *  | 
            ||
| 140 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 141 | */  | 
            ||
| 142 | 1 | View Code Duplication | public function query($orderNo, $type = self::OUT_TRADE_NO)  | 
            
| 150 | |||
| 151 | /**  | 
            ||
| 152 | * Query order by transaction_id.  | 
            ||
| 153 | *  | 
            ||
| 154 | * @param string $transactionId  | 
            ||
| 155 | *  | 
            ||
| 156 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 157 | */  | 
            ||
| 158 | 1 | public function queryByTransactionId($transactionId)  | 
            |
| 162 | |||
| 163 | /**  | 
            ||
| 164 | * Close order by out_trade_no.  | 
            ||
| 165 | *  | 
            ||
| 166 | * @param $tradeNo  | 
            ||
| 167 | *  | 
            ||
| 168 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 169 | */  | 
            ||
| 170 | 1 | public function close($tradeNo)  | 
            |
| 178 | |||
| 179 | /**  | 
            ||
| 180 | * Reverse order.  | 
            ||
| 181 | *  | 
            ||
| 182 | * @param string $orderNo  | 
            ||
| 183 | * @param string $type  | 
            ||
| 184 | *  | 
            ||
| 185 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 186 | */  | 
            ||
| 187 | 1 | public function reverse($orderNo, $type = self::OUT_TRADE_NO)  | 
            |
| 195 | |||
| 196 | /**  | 
            ||
| 197 | * Reverse order by transaction_id.  | 
            ||
| 198 | *  | 
            ||
| 199 | * @param int $transactionId  | 
            ||
| 200 | *  | 
            ||
| 201 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 202 | */  | 
            ||
| 203 | public function reverseByTransactionId($transactionId)  | 
            ||
| 207 | |||
| 208 | /**  | 
            ||
| 209 | * Make a refund request.  | 
            ||
| 210 | *  | 
            ||
| 211 | * @param string $orderNo  | 
            ||
| 212 | * @param float $totalFee  | 
            ||
| 213 | * @param float $refundFee  | 
            ||
| 214 | * @param string $opUserId  | 
            ||
| 215 | * @param string $type  | 
            ||
| 216 | * @param string $refundAccount  | 
            ||
| 217 | *  | 
            ||
| 218 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 219 | */  | 
            ||
| 220 | 1 | public function refund(  | 
            |
| 241 | |||
| 242 | /**  | 
            ||
| 243 | * Refund by transaction id.  | 
            ||
| 244 | *  | 
            ||
| 245 | * @param string $orderNo  | 
            ||
| 246 | * @param float $totalFee  | 
            ||
| 247 | * @param float $refundFee  | 
            ||
| 248 | * @param string $opUserId  | 
            ||
| 249 | * @param string $refundAccount  | 
            ||
| 250 | *  | 
            ||
| 251 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 252 | */  | 
            ||
| 253 | public function refundByTransactionId(  | 
            ||
| 263 | |||
| 264 | /**  | 
            ||
| 265 | * Query refund status.  | 
            ||
| 266 | *  | 
            ||
| 267 | * @param string $orderNo  | 
            ||
| 268 | * @param string $type  | 
            ||
| 269 | *  | 
            ||
| 270 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 271 | */  | 
            ||
| 272 | 1 | View Code Duplication | public function queryRefund($orderNo, $type = self::OUT_TRADE_NO)  | 
            
| 280 | |||
| 281 | /**  | 
            ||
| 282 | * Query refund status by out_refund_no.  | 
            ||
| 283 | *  | 
            ||
| 284 | * @param string $refundNo  | 
            ||
| 285 | *  | 
            ||
| 286 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 287 | */  | 
            ||
| 288 | public function queryRefundByRefundNo($refundNo)  | 
            ||
| 292 | |||
| 293 | /**  | 
            ||
| 294 | * Query refund status by transaction_id.  | 
            ||
| 295 | *  | 
            ||
| 296 | * @param string $transactionId  | 
            ||
| 297 | *  | 
            ||
| 298 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 299 | */  | 
            ||
| 300 | public function queryRefundByTransactionId($transactionId)  | 
            ||
| 304 | |||
| 305 | /**  | 
            ||
| 306 | * Query refund status by refund_id.  | 
            ||
| 307 | *  | 
            ||
| 308 | * @param string $refundId  | 
            ||
| 309 | *  | 
            ||
| 310 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 311 | */  | 
            ||
| 312 | public function queryRefundByRefundId($refundId)  | 
            ||
| 316 | |||
| 317 | /**  | 
            ||
| 318 | * Download bill history as a table file.  | 
            ||
| 319 | *  | 
            ||
| 320 | * @param string $date  | 
            ||
| 321 | * @param string $type  | 
            ||
| 322 | *  | 
            ||
| 323 | * @return \Psr\Http\Message\ResponseInterface  | 
            ||
| 324 | */  | 
            ||
| 325 | 1 | public function downloadBill($date, $type = self::BILL_TYPE_ALL)  | 
            |
| 334 | |||
| 335 | /**  | 
            ||
| 336 | * Convert long url to short url.  | 
            ||
| 337 | *  | 
            ||
| 338 | * @param string $url  | 
            ||
| 339 | *  | 
            ||
| 340 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 341 | */  | 
            ||
| 342 | 1 | public function urlShorten($url)  | 
            |
| 346 | |||
| 347 | /**  | 
            ||
| 348 | * Report API status to WeChat.  | 
            ||
| 349 | *  | 
            ||
| 350 | * @param string $api  | 
            ||
| 351 | * @param int $timeConsuming  | 
            ||
| 352 | * @param string $resultCode  | 
            ||
| 353 | * @param string $returnCode  | 
            ||
| 354 | * @param array $other ex: err_code,err_code_des,out_trade_no,user_ip...  | 
            ||
| 355 | *  | 
            ||
| 356 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 357 | */  | 
            ||
| 358 | public function report($api, $timeConsuming, $resultCode, $returnCode, array $other = [])  | 
            ||
| 372 | |||
| 373 | /**  | 
            ||
| 374 | * Get openid by auth code.  | 
            ||
| 375 | *  | 
            ||
| 376 | * @param string $authCode  | 
            ||
| 377 | *  | 
            ||
| 378 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 379 | */  | 
            ||
| 380 | 1 | public function authCodeToOpenId($authCode)  | 
            |
| 384 | |||
| 385 | /**  | 
            ||
| 386 | * Merchant setter.  | 
            ||
| 387 | *  | 
            ||
| 388 | * @param Merchant $merchant  | 
            ||
| 389 | *  | 
            ||
| 390 | * @return $this  | 
            ||
| 391 | */  | 
            ||
| 392 | 1 | public function setMerchant(Merchant $merchant)  | 
            |
| 396 | |||
| 397 | /**  | 
            ||
| 398 | * Merchant getter.  | 
            ||
| 399 | *  | 
            ||
| 400 | * @return Merchant  | 
            ||
| 401 | */  | 
            ||
| 402 | 1 | public function getMerchant()  | 
            |
| 406 | |||
| 407 | /**  | 
            ||
| 408 | * Set sandbox mode.  | 
            ||
| 409 | *  | 
            ||
| 410 | * @param bool $enabled  | 
            ||
| 411 | *  | 
            ||
| 412 | * @return $this  | 
            ||
| 413 | */  | 
            ||
| 414 | 10 | public function sandboxMode($enabled = false)  | 
            |
| 420 | |||
| 421 | /**  | 
            ||
| 422 | * Make a API request.  | 
            ||
| 423 | *  | 
            ||
| 424 | * @param string $api  | 
            ||
| 425 | * @param array $params  | 
            ||
| 426 | * @param string $method  | 
            ||
| 427 | * @param array $options  | 
            ||
| 428 | * @param bool $returnResponse  | 
            ||
| 429 | *  | 
            ||
| 430 | * @return \EasyWeChat\Support\Collection|\Psr\Http\Message\ResponseInterface  | 
            ||
| 431 | */  | 
            ||
| 432 | 10 | protected function request($api, array $params, $method = 'post', array $options = [], $returnResponse = false)  | 
            |
| 452 | |||
| 453 | /**  | 
            ||
| 454 | * Generate sign key.  | 
            ||
| 455 | *  | 
            ||
| 456 | * @param array $params  | 
            ||
| 457 | *  | 
            ||
| 458 | * @return string  | 
            ||
| 459 | */  | 
            ||
| 460 | 10 | protected function generateSignKey($params)  | 
            |
| 466 | |||
| 467 | /**  | 
            ||
| 468 | * Request with SSL.  | 
            ||
| 469 | *  | 
            ||
| 470 | * @param string $api  | 
            ||
| 471 | * @param array $params  | 
            ||
| 472 | * @param string $method  | 
            ||
| 473 | *  | 
            ||
| 474 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 475 | */  | 
            ||
| 476 | 2 | protected function safeRequest($api, array $params, $method = 'post')  | 
            |
| 485 | |||
| 486 | /**  | 
            ||
| 487 | * Parse Response XML to array.  | 
            ||
| 488 | *  | 
            ||
| 489 | * @param ResponseInterface $response  | 
            ||
| 490 | *  | 
            ||
| 491 | * @return \EasyWeChat\Support\Collection  | 
            ||
| 492 | */  | 
            ||
| 493 | 9 | protected function parseResponse($response)  | 
            |
| 501 | |||
| 502 | /**  | 
            ||
| 503 | * Wrap API.  | 
            ||
| 504 | *  | 
            ||
| 505 | * @param string $resource  | 
            ||
| 506 | *  | 
            ||
| 507 | * @return string  | 
            ||
| 508 | */  | 
            ||
| 509 | 8 | protected function wrapApi($resource)  | 
            |
| 513 | |||
| 514 | /**  | 
            ||
| 515 | * Get sandbox sign key.  | 
            ||
| 516 | */  | 
            ||
| 517 | protected function getSandboxSignKey()  | 
            ||
| 539 | |||
| 540 | /**  | 
            ||
| 541 | * Return the cache manager.  | 
            ||
| 542 | *  | 
            ||
| 543 | * @return \Doctrine\Common\Cache\Cache  | 
            ||
| 544 | */  | 
            ||
| 545 | public function getCache()  | 
            ||
| 549 | }  | 
            ||
| 550 |