application/city/classes/filter/verifier/class_CityNameVerifierFilter.php

   1 <?php
   2 // Own namespace
   3 namespace Org\Mxchange\City\Filter\Verifier;
   4
   5 // Import framework stuff
   6 use Org\Mxchange\CoreFramework\Request\Requestable;
   7 use Org\Mxchange\CoreFramework\Response\Responseable;
   8
   9 /**
  10  * A concrete filter for verfying the city name. This filter may intercept the
  11  * filter chain if no city name is given or if supplied city name has an invalid
  12  * form. It could also intercept our filter chain if city name was not found.
  13  *
  14  * @author              Roland Haeder <webmaster@shipsimu.org>
  15  * @version             0.0.0
  16  * @copyright   Copyright (c) 2015, 2016 City Developer Team
  17  * @license             GNU GPL 3.0 or any newer version
  18  * @link                http://www.shipsimu.org
  19  *
  20  * This program is free software: you can redistribute it and/or modify
  21  * it under the terms of the GNU General Public License as published by
  22  * the Free Software Foundation, either version 3 of the License, or
  23  * (at your option) any later version.
  24  *
  25  * This program is distributed in the hope that it will be useful,
  26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  * GNU General Public License for more details.
  29  *
  30  * You should have received a copy of the GNU General Public License
  31  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  32  */
  33 class CityNameVerifierFilter extends BaseFilter implements Filterable {
  34         /**
  35          * Protected constructor
  36          *
  37          * @return      void
  38          */
  39         protected function __construct () {
  40                 // Call parent constructor
  41                 parent::__construct(__CLASS__);
  42         }
  43
  44         /**
  45          * Creates an instance of this filter class
  46          *
  47          * @return      $filterInstance         An instance of this filter class
  48          */
  49         public static final function createCityNameVerifierFilter () {
  50                 // Get a new instance
  51                 $filterInstance = new CityNameVerifierFilter();
  52
  53                 // Return the instance
  54                 return $filterInstance;
  55         }
  56
  57         /**
  58          * Executes the filter with given request and response objects
  59          *
  60          * @param       $requestInstance        An instance of a class with an Requestable interface
  61          * @param       $responseInstance       An instance of a class with an Responseable interface
  62          * @return      void
  63          * @throws      FilterChainException    If this filter fails to operate
  64          */
  65         public function execute (Requestable $requestInstance, Responseable $responseInstance) {
  66                 // Get city name from request
  67                 $cityName = $requestInstance->getRequestElement(CityInformationDatabaseWrapper::DB_COLUMN_CITY_NAME);
  68
  69                 // Is the city name set?
  70                 if (is_null($cityName)) {
  71                         // Not found in form so stop the filtering process
  72                         $requestInstance->requestIsValid(FALSE);
  73
  74                         // Add a message to the response
  75                         $responseInstance->addFatalMessage('city_name_unset');
  76
  77                         // Abort here
  78                         throw new FilterChainException($this, self::EXCEPTION_FILTER_CHAIN_INTERCEPTED);
  79                 } elseif (empty($cityName)) {
  80                         // Empty field!
  81                         $requestInstance->requestIsValid(FALSE);
  82
  83                         // Add a message to the response
  84                         $responseInstance->addFatalMessage('city_name_empty');
  85
  86                         // Abort here
  87                         throw new FilterChainException($this, self::EXCEPTION_FILTER_CHAIN_INTERCEPTED);
  88                 } elseif ($this->ifCityNameIsTaken($cityName) === TRUE) {
  89                         // City name is already taken
  90                         $requestInstance->requestIsValid(FALSE);
  91
  92                         // Add a message to the response
  93                         $responseInstance->addFatalMessage('city_name_taken');
  94
  95                         // Abort here
  96                         throw new FilterChainException($this, self::EXCEPTION_FILTER_CHAIN_INTERCEPTED);
  97                 }
  98         }
  99
 100         /**
 101          * Check whether the city name as already been taken
 102          *
 103          * @param       $cityName               Cityname to check for existence
 104          * @return      $alreadyTaken   Whether the city name has been taken
 105          */
 106         private function ifCityNameIsTaken ($cityName) {
 107                 // Get a new instance
 108                 $managerInstance = ManagerFactory::createManagerByType('city');
 109
 110                 // Make sure the instance is valid
 111                 assert($managerInstance instanceof ManageableCity);
 112
 113                 // Does the city name exist?
 114                 $alreadyTaken = ($managerInstance->ifCityNameExists($cityName));
 115
 116                 // Return the result
 117                 return $alreadyTaken;
 118         }
 119 }