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<?php
namespace SMW\Query;
use RuntimeException;
use SMW\QueryEngine;
use SMW\Store;
use SMW\StoreAware;
/**
* @private
*
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class QuerySourceFactory {
/**
* @var Store
*/
private $store;
/**
* @var array
*/
private $querySources = [];
/**
* @since 2.5
*
* @param Store $store
* @param array $querySources
*/
public function __construct( Store $store, $querySources = [] ) {
$this->store = $store;
$this->querySources = $querySources;
// Standard store
$this->querySources['sql_store'] = 'SMW\SQLStore\SQLStore';
}
/**
* @see DefaultSettings::$smwgQuerySources
*
* @since 2.5
*
* @param string|null $source
*
* @return QueryEngine|Store
* @throws RuntimeException
*/
public function get( $source = null ) {
$params = [];
if ( $source !== '' && isset( $this->querySources[$source] ) ) {
$querySource = $this->querySources[$source];
// [ '\SMW\FooHandler', ... parameters ],
if ( is_array( $querySource ) ) {
$source = array_shift( $querySource );
$params = $querySource;
} else {
$source = $this->querySources[$source];
}
}
// Fallback to the default store
if ( $source === null || !class_exists( $source ) ) {
$source = $this->store;
} elseif ( $params !== [] ) {
$source = new $source( $params );
} else {
$source = new $source;
}
if ( !$source instanceof QueryEngine && !$source instanceof Store ) {
throw new RuntimeException( get_class( $source ) . " does not match the expected QueryEngine interface." );
}
if ( $source instanceof StoreAware ) {
$source->setStore( $this->store );
}
return $source;
}
/**
* @since 2.5
*
* @param string|null $source
*
* @return string
*/
public function toString( $source = null ) {
if ( $source === 'sql_store' ) {
return 'SMWSQLStore';
}
if ( $source !== '' && $source !== null ) {
return $source;
}
return json_encode( $this->store->getInfo( 'store' ) );
}
}
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