SemanticMaps/includes/queryprinters/SM_QueryPrinters.php

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<?php

if ( !defined( 'MEDIAWIKI' ) ) {
        die( 'Not an entry point.' );
}

$wgHooks['MappingFeatureLoad'][] = 'SMQueryPrinters::initialize';

final class SMQueryPrinters {
        
        public static function initialize() {
                global $wgAutoloadClasses;
                
                $wgAutoloadClasses['SMQueryHandler']    = dirname( __FILE__ ) . '/SM_QueryHandler.php';
                $wgAutoloadClasses['SMMapper']                  = dirname( __FILE__ ) . '/SM_Mapper.php';
                $wgAutoloadClasses['SMMapPrinter']              = dirname( __FILE__ ) . '/SM_MapPrinter.php';
                $wgAutoloadClasses['SMKMLPrinter']              = dirname( __FILE__ ) . '/SM_KMLPrinter.php';
                
                self::initFormat( 'kml', 'SMKMLPrinter' );
                
                $hasQueryPrinters = false;

                foreach ( MapsMappingServices::getServiceIdentifiers() as $serviceIdentifier ) {
                        $service = MapsMappingServices::getServiceInstance( $serviceIdentifier );       
                                
                        // Check if the service has a query printer.
                        $QPClass = $service->getFeature( 'qp' );
                        
                        // If the service has no QP, skipt it and continue with the next one.
                        if ( $QPClass === false ) continue;
                        
                        // At least one query printer will be enabled when this point is reached.
                        $hasQueryPrinters = true;
                        
                        // Initiate the format.
                        $aliases = $service->getAliases();
                        self::initFormat( $service->getName(), 'SMMapper' /* $QPClass */, $aliases );
                }

                // Add the 'map' result format if there are mapping services that have QP's loaded.
                if ( $hasQueryPrinters ) {
                        self::initFormat( 'map', 'SMMapper' );
                }
                
                return true;
        }
        
        private static function initFormat( $format, $formatClass, array $aliases = array() ) {
                global $smwgResultAliases;

                // Add the QP to SMW.
                self::addFormatQP( $format, $formatClass );

                // If SMW supports aliasing, add the aliases to $smwgResultAliases.
                if ( isset( $smwgResultAliases ) ) {
                        $smwgResultAliases[$format] = $aliases;
                }
                else { // If SMW does not support aliasing, add every alias as a format.
                        foreach ( $aliases as $alias ) self::addFormatQP( $alias, $formatClass );
                }
        }

        private static function addFormatQP( $format, $class ) {
                global $smwgResultFormats;
                $smwgResultFormats[$format] = $class;
        }
        
}

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