includes/search/SearchEngineFactory.php

   1 <?php
   2
   3 use Wikimedia\Rdbms\IDatabase;
   4
   5 /**
   6  * Factory class for SearchEngine.
   7  * Allows to create engine of the specific type.
   8  */
   9 class SearchEngineFactory {
  10         /**
  11          * Configuration for SearchEngine classes.
  12          * @var SearchEngineConfig
  13          */
  14         private $config;
  15
  16         public function __construct( SearchEngineConfig $config ) {
  17                 $this->config = $config;
  18         }
  19
  20         /**
  21          * Create SearchEngine of the given type.
  22          * @param string $type
  23          * @return SearchEngine
  24          */
  25         public function create( $type = null ) {
  26                 $dbr = null;
  27
  28                 $configType = $this->config->getSearchType();
  29                 $alternatives = $this->config->getSearchTypes();
  30
  31                 if ( $type && in_array( $type, $alternatives ) ) {
  32                         $class = $type;
  33                 } elseif ( $configType !== null ) {
  34                         $class = $configType;
  35                 } else {
  36                         $dbr = wfGetDB( DB_REPLICA );
  37                         $class = self::getSearchEngineClass( $dbr );
  38                 }
  39
  40                 $search = new $class( $dbr );
  41                 return $search;
  42         }
  43
  44         /**
  45          * @param IDatabase $db
  46          * @return string SearchEngine subclass name
  47          * @since 1.28
  48          */
  49         public static function getSearchEngineClass( IDatabase $db ) {
  50                 switch ( $db->getType() ) {
  51                         case 'sqlite':
  52                                 return 'SearchSqlite';
  53                         case 'mysql':
  54                                 return 'SearchMySQL';
  55                         case 'postgres':
  56                                 return 'SearchPostgres';
  57                         case 'mssql':
  58                                 return 'SearchMssql';
  59                         case 'oracle':
  60                                 return 'SearchOracle';
  61                         default:
  62                                 return 'SearchEngineDummy';
  63                 }
  64         }
  65 }