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<?php
namespace SMW\SPARQLStore\QueryEngine;
use SMW\Exporter\Element\ExpElement;
use SMW\Store;
use SMWExporter as Exporter;
use SMWQuery as Query;
use SMWQueryResult as QueryResult;
/**
* @license GNU GPL v2+
* @since 2.0
*
* @author Markus Krötzsch
* @author mwjames
*/
class QueryResultFactory {
/**
* @var Store
*/
private $store;
/**
* @since 2.0
*
* @param Store $store
*/
public function __construct( Store $store ) {
$this->store = $store;
}
/**
* @since 2.0
*
* @param Query $query QueryResults hold a reference to original query
* @param boolean $hasFurtherResults
*
* @return QueryResult
*/
public function newEmptyQueryResult( Query $query, $hasFurtherResults = false ) {
return new QueryResult(
$query->getDescription()->getPrintrequests(),
$query,
[],
$this->store,
$hasFurtherResults
);
}
/**
* This function is used to generate instance query results, and the given
* result wrapper must have an according format (one result column that
* contains URIs of wiki pages).
*
* @param RepositoryResult|null $repositoryResult
* @param Query $query QueryResults hold a reference to original query
*
* @return QueryResult
*/
public function newQueryResult( RepositoryResult $repositoryResult = null , Query $query ) {
if ( $repositoryResult === null ) {
return $this->newEmptyQueryResult( $query );
}
if ( $query->querymode === Query::MODE_COUNT ) {
return $this->makeQueryResultForCount( $repositoryResult, $query );
}
return $this->makeQueryResultForInstance( $repositoryResult, $query );
}
private function makeQueryResultForCount( RepositoryResult $repositoryResult, Query $query ) {
$queryResult = new QueryResult(
$query->getDescription()->getPrintrequests(),
$query,
[],
$this->store,
false
);
if ( $repositoryResult->getErrorCode() === RepositoryResult::ERROR_NOERROR ) {
$queryResult->setCountValue( $repositoryResult->getNumericValue() );
} else {
$queryResult->addErrors( [ wfMessage( 'smw_db_sparqlqueryproblem' )->inContentLanguage()->text() ] );
}
return $queryResult;
}
private function makeQueryResultForInstance( RepositoryResult $repositoryResult, Query $query ) {
$resultDataItems = [];
foreach ( $repositoryResult as $resultRow ) {
if ( count( $resultRow ) > 0 && $resultRow[0] instanceof ExpElement ) {
$dataItem = Exporter::getInstance()->findDataItemForExpElement( $resultRow[0] );
if ( !is_null( $dataItem ) ) {
$resultDataItems[] = $dataItem;
}
}
}
if ( $repositoryResult->numRows() > $query->getLimit() ) {
if ( count( $resultDataItems) > 1 ) {
array_pop( $resultDataItems );
}
$hasFurtherResults = true;
} else {
$hasFurtherResults = false;
}
$result = new QueryResult(
$query->getDescription()->getPrintrequests(),
$query,
$resultDataItems,
$this->store,
$hasFurtherResults
);
switch ( $repositoryResult->getErrorCode() ) {
case RepositoryResult::ERROR_NOERROR:
break;
case RepositoryResult::ERROR_INCOMPLETE:
$result->addErrors( [ wfMessage( 'smw_db_sparqlqueryincomplete' )->inContentLanguage()->text() ] );
break;
default:
$result->addErrors( [ wfMessage( 'smw_db_sparqlqueryproblem' )->inContentLanguage()->text() ] );
break;
}
return $result;
}
}
|
