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 WSClient 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 WSClient, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 43 | class WSClient |
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| 44 | { |
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| 45 | // HTTP Client instance |
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| 46 | protected $httpClient = null; |
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| 47 | |||
| 48 | // Service URL to which client connects to |
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| 49 | protected $serviceBaseURL = 'webservice.php'; |
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| 50 | |||
| 51 | // Webservice login validity |
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| 52 | private $serviceServerTime = false; |
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| 53 | private $serviceExpireTime = false; |
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| 54 | private $serviceToken = false; |
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| 55 | |||
| 56 | // Webservice user credentials |
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| 57 | private $userName = false; |
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| 58 | private $accessKey = false; |
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| 59 | |||
| 60 | // Webservice login credentials |
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| 61 | private $userID = false; |
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| 62 | private $sessionName = false; |
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| 63 | |||
| 64 | // Vtiger CRM and WebServices API version |
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| 65 | private $apiVersion = false; |
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| 66 | private $vtigerVersion = false; |
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| 67 | |||
| 68 | // Last operation error information |
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| 69 | protected $lastErrorMessage = false; |
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| 70 | |||
| 71 | /** |
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| 72 | * Class constructor |
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| 73 | * @param string $url The URL of the remote WebServices server |
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| 74 | */ |
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| 75 | public function __construct($url) |
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| 89 | |||
| 90 | /** |
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| 91 | * Check if server response contains an error, therefore the requested operation has failed |
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| 92 | * @access private |
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| 93 | * @param array $jsonResult Server response object to check for errors |
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| 94 | * @return boolean True if response object contains an error |
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| 95 | */ |
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| 96 | private function checkForError(array $jsonResult) // TODO move checkForError body to sendHttpRequest method's body |
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| 110 | |||
| 111 | /** |
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| 112 | * Checks and performs a login operation if requried and repeats login if needed |
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| 113 | * @access private |
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| 114 | */ |
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| 115 | private function checkLogin() |
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| 122 | |||
| 123 | /** |
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| 124 | * Sends HTTP request to VTiger web service API endpoint |
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| 125 | * @access private |
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| 126 | * @param array $requestData HTTP request data |
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| 127 | * @param string $method HTTP request method (GET, POST etc) |
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| 128 | * @return array Returns request result object (null in case of failure) |
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| 129 | */ |
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| 130 | private function sendHttpRequest(array $requestData, $method = 'POST') |
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| 159 | |||
| 160 | /** |
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| 161 | * Gets a challenge token from the server and stores for future requests |
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| 162 | * @access private |
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| 163 | * @param string $username VTiger user name |
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| 164 | * @return bool Returns false in case of failure |
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| 165 | */ |
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| 166 | private function passChallenge($username) |
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| 184 | |||
| 185 | /** |
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| 186 | * Login to the server using username and VTiger access key token |
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| 187 | * @access public |
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| 188 | * @param string $username VTiger user name |
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| 189 | * @param string $accessKey VTiger access key token (visible on user profile/settings page) |
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| 190 | * @return boolean Returns true if login operation has been successful |
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| 191 | */ |
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| 192 | public function login($username, $accessKey) |
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| 224 | |||
| 225 | /** |
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| 226 | * Allows you to login using username and password instead of access key (works on some VTige forks) |
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| 227 | * @access public |
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| 228 | * @param string $username VTiger user name |
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| 229 | * @param string $password VTiger password (used to access CRM using the standard login page) |
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| 230 | * @param string $accessKey This parameter will be filled with user's VTiger access key |
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| 231 | * @return boolean Returns true if login operation has been successful |
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| 232 | */ |
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| 233 | public function loginPassword($username, $password, &$accessKey = null) |
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| 257 | |||
| 258 | /** |
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| 259 | * Gets last operation error, if any |
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| 260 | * @access public |
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| 261 | * @return WSClientError The error object |
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| 262 | */ |
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| 263 | public function getLastError() |
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| 267 | |||
| 268 | /** |
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| 269 | * Returns the client library version. |
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| 270 | * @access public |
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| 271 | * @return string Client library version |
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| 272 | */ |
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| 273 | public function getVersion() |
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| 278 | |||
| 279 | /** |
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| 280 | * Lists all the Vtiger entity types available through the API |
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| 281 | * @access public |
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| 282 | * @return array List of entity types |
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| 283 | */ |
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| 284 | public function getTypes() |
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| 303 | |||
| 304 | /** |
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| 305 | * Get the type information about a given VTiger entity type. |
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| 306 | * @access public |
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| 307 | * @param string $moduleName Name of the module / entity type |
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| 308 | * @return array Result object |
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| 309 | */ |
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| 310 | public function getType($moduleName) |
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| 323 | |||
| 324 | /** |
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| 325 | * Gets the entity ID prepended with module / entity type ID |
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| 326 | * @access private |
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| 327 | * @param string $moduleName Name of the module / entity type |
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| 328 | * @param string $entityID Numeric entity ID |
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| 329 | * @return boolean|string Returns false if it is not possible to retrieve module / entity type ID |
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| 330 | */ |
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| 331 | private function getTypedID($moduleName, $entityID) |
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| 346 | |||
| 347 | /** |
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| 348 | * Invokes custom operation (defined in vtiger_ws_operation table) |
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| 349 | * @access public |
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| 350 | * @param string $operation Name of the webservice to invoke |
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| 351 | * @param array [$params = null] Parameter values to operation |
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| 352 | * @param string [$method = 'POST'] HTTP request method (GET, POST etc) |
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| 353 | * @return array Result object |
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| 354 | */ |
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| 355 | public function invokeOperation($operation, array $params = null, $method = 'POST') |
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| 377 | |||
| 378 | /** |
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| 379 | * VTiger provides a simple query language for fetching data. |
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| 380 | * This language is quite similar to select queries in SQL. |
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| 381 | * There are limitations, the queries work on a single Module, |
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| 382 | * embedded queries are not supported, and does not support joins. |
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| 383 | * But this is still a powerful way of getting data from Vtiger. |
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| 384 | * Query always limits its output to 100 records, |
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| 385 | * Client application can use limit operator to get different records. |
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| 386 | * @access public |
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| 387 | * @param string $query SQL-like expression |
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| 388 | * @return array Query results |
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| 389 | */ |
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| 390 | public function query($query) |
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| 408 | |||
| 409 | /** |
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| 410 | * Retrieves an entity by ID |
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| 411 | * @param string $moduleName The name of the module / entity type |
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| 412 | * @param string $entityID The ID of the entity to retrieve |
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| 413 | * @return boolean Entity data |
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| 414 | */ |
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| 415 | View Code Duplication | public function entityRetrieveByID($moduleName, $entityID) |
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| 431 | |||
| 432 | /** |
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| 433 | * Uses VTiger queries to retrieve the entity matching a list of constraints |
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| 434 | * @param string $moduleName The name of the module / entity type |
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| 435 | * @param array $params Data used to find a matching entry |
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| 436 | * @return array $select The list of fields to select (defaults to SQL-like '*' - all the fields) |
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| 437 | * @return int The matching record |
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| 438 | */ |
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| 439 | public function entityRetrieve($moduleName, array $params, array $select = []) |
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| 447 | |||
| 448 | /** |
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| 449 | * Uses VTiger queries to retrieve the ID of the entity matching a list of constraints |
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| 450 | * @param string $moduleName The name of the module / entity type |
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| 451 | * @param array $params Data used to find a matching entry |
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| 452 | * @return int Numeric ID |
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| 453 | */ |
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| 454 | public function entityRetrieveID($moduleName, array $params) // TODO check if params is an assoc array |
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| 467 | |||
| 468 | /** |
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| 469 | * Creates an entity for the giving module |
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| 470 | * @param string $moduleName Name of the module / entity type for which the entry has to be created |
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| 471 | * @param array $params Entity data |
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| 472 | * @return array Entity creation results |
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| 473 | */ |
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| 474 | public function entityCreate($moduleName, array $params) // TODO check if params is an assoc array |
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| 493 | |||
| 494 | /** |
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| 495 | * Updates an entity |
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| 496 | * @param string $moduleName The name of the module / entity type |
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| 497 | * @param array $params Entity data |
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| 498 | * @return array Entity update result |
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| 499 | */ |
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| 500 | public function entityUpdate($moduleName, array $params) // TODO check if params is an assoc array |
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| 532 | |||
| 533 | /** |
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| 534 | * Provides entity removal functionality |
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| 535 | * @param string $moduleName The name of the module / entity type |
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| 536 | * @param string $entityID The ID of the entity to delete |
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| 537 | * @return array Removal status object |
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| 538 | */ |
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| 539 | View Code Duplication | public function entityDelete($moduleName, $entityID) |
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| 555 | |||
| 556 | /** |
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| 557 | * Retrieves multiple records using module name and a set of constraints |
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| 558 | * @param string $moduleName The name of the module / entity type |
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| 559 | * @param array $params Data used to find the matching entries |
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| 560 | * @return array $select The list of fields to select (defaults to SQL-like '*' - all the fields) |
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| 561 | * @return int $limit limit the list of entries to N records (acts like LIMIT in SQL) |
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| 562 | * @return bool|array The array containing the matching entries or false if nothing was found |
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| 563 | */ |
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| 564 | public function entitiesRetrieve($moduleName, array $params, array $select = [], $limit = 0) |
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| 586 | |||
| 587 | /** |
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| 588 | * Sync will return a sync result object containing details of changes after modifiedTime |
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| 589 | * @param int [$modifiedTime = null] The date of the first change |
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| 590 | * @param string [$moduleName = null] The name of the module / entity type |
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| 591 | * @return array Sync result object |
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| 592 | */ |
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| 593 | public function entitiesSync($modifiedTime = null, $moduleName = null) |
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| 614 | |||
| 615 | /** |
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| 616 | * Builds the query using the supplied parameters |
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| 617 | * @param string $moduleName The name of the module / entity type |
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| 618 | * @param array $params Data used to find the matching entries |
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| 619 | * @return array $select The list of fields to select (defaults to SQL-like '*' - all the fields) |
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| 620 | * @return int $limit limit the list of entries to N records (acts like LIMIT in SQL) |
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| 621 | * @return string The query build out of the supplied parameters |
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| 622 | */ |
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| 623 | private function buildQuery($moduleName, array $params, array $select = [], $limit = 0) |
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| 638 | |||
| 639 | /** |
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| 640 | * A helper method, used to check in an array is associative or not |
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| 641 | * @param string Array to test |
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| 642 | * @return bool Returns true in a given array is associative and false if it's not |
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| 643 | */ |
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| 644 | private function isAssocArray(array $array) |
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| 653 | } |
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| 654 |
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..