includes/search/SearchEngineFactory.php

   1 <?php
   2
   3 /**
   4  * Factory class for SearchEngine.
   5  * Allows to create engine of the specific type.
   6  */
   7 class SearchEngineFactory {
   8         /**
   9          * Configuration for SearchEngine classes.
  10          * @var SearchEngineConfig
  11          */
  12         private $config;
  13
  14         public function __construct( SearchEngineConfig $config ) {
  15                 $this->config = $config;
  16         }
  17
  18         /**
  19          * Create SearchEngine of the given type.
  20          * @param string $type
  21          * @return SearchEngine
  22          */
  23         public function create( $type = null ) {
  24                 $dbr = null;
  25
  26                 $configType = $this->config->getSearchType();
  27                 $alternatives = $this->config->getSearchTypes();
  28
  29                 if ( $type && in_array( $type, $alternatives ) ) {
  30                         $class = $type;
  31                 } elseif ( $configType !== null ) {
  32                         $class = $configType;
  33                 } else {
  34                         $dbr = wfGetDB( DB_REPLICA );
  35                         $class = self::getSearchEngineClass( $dbr );
  36                 }
  37
  38                 $search = new $class( $dbr );
  39                 return $search;
  40         }
  41
  42         /**
  43          * @param IDatabase $db
  44          * @return string SearchEngine subclass name
  45          * @since 1.28
  46          */
  47         public static function getSearchEngineClass( IDatabase $db ) {
  48                 switch ( $db->getType() ) {
  49                         case 'sqlite':
  50                                 return 'SearchSqlite';
  51                         case 'mysql':
  52                                 return 'SearchMySQL';
  53                         case 'postgres':
  54                                 return 'SearchPostgres';
  55                         case 'mssql':
  56                                 return 'SearchMssql';
  57                         case 'oracle':
  58                                 return 'SearchOracle';
  59                         default:
  60                                 return 'SearchEngineDummy';
  61                 }
  62         }
  63 }