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<?php
namespace SMW\SQLStore\QueryEngine;
use SMW\MediaWiki\Database;
use SMW\SQLStore\SQLStore;
use SMWQuery as Query;
/**
* @license GNU GPL v2+
* @since 2.5
*
* @author Markus Krötzsch
* @author mwjames
*/
class QuerySegmentListBuildManager {
/**
* @var QuerySegment[]
*/
private $querySegmentList = [];
/**
* @var string[]
*/
private $errors = [];
/**
* @var string[]
*/
private $sortKeys;
/**
* @var QuerySegmentListBuilder
*/
private $querySegmentListBuilder;
/**
* @var OrderCondition
*/
private $orderCondition;
/**
* @since 2.5
*
* @param Database $connection
* @param QuerySegmentListBuilder $querySegmentListBuilder
* @param OrderCondition $orderCondition
*/
public function __construct( Database $connection, QuerySegmentListBuilder $querySegmentListBuilder, OrderCondition $orderCondition ) {
$this->connection = $connection;
$this->querySegmentListBuilder = $querySegmentListBuilder;
$this->orderCondition = $orderCondition;
}
/**
* @since 2.2
*
* @return string[]
*/
public function getSortKeys() {
return $this->sortKeys;
}
/**
* @since 2.5
*
* @return array
*/
public function getErrors() {
return $this->errors;
}
/**
* @since 2.5
*
* @return array
*/
public function getQuerySegmentList() {
return $this->querySegmentList;
}
/**
* Compute abstract representation of the query (compilation)
*
* @param Query $query
*
* @return integer
*/
public function getQuerySegmentFrom( Query $query ) {
$this->sortKeys = $query->sortkeys;
// Anchor IT_TABLE as root element
$rootSegmentNumber = QuerySegment::$qnum;
$rootSegment = new QuerySegment();
$rootSegment->joinTable = SQLStore::ID_TABLE;
$rootSegment->joinfield = "$rootSegment->alias.smw_id";
$this->querySegmentListBuilder->addQuerySegment(
$rootSegment
);
$this->querySegmentListBuilder->setSortKeys(
$this->sortKeys
);
// compile query, build query "plan"
$this->querySegmentListBuilder->getQuerySegmentFrom(
$query->getDescription()
);
$qid = $this->querySegmentListBuilder->getLastQuerySegmentId();
$this->querySegmentList = $this->querySegmentListBuilder->getQuerySegmentList();
$this->errors = $this->querySegmentListBuilder->getErrors();
// no valid/supported condition; ensure that at least only proper pages
// are delivered
if ( $qid < 0 ) {
$qid = $rootSegmentNumber;
$qobj = $this->querySegmentList[$rootSegmentNumber];
$qobj->where = "$qobj->alias.smw_iw!=" . $this->connection->addQuotes( SMW_SQL3_SMWIW_OUTDATED ) .
" AND $qobj->alias.smw_iw!=" . $this->connection->addQuotes( SMW_SQL3_SMWREDIIW ) .
" AND $qobj->alias.smw_iw!=" . $this->connection->addQuotes( SMW_SQL3_SMWBORDERIW ) .
" AND $qobj->alias.smw_iw!=" . $this->connection->addQuotes( SMW_SQL3_SMWINTDEFIW );
$this->querySegmentListBuilder->addQuerySegment( $qobj );
}
if ( isset( $this->querySegmentList[$qid]->joinTable ) && $this->querySegmentList[$qid]->joinTable != SQLStore::ID_TABLE ) {
// manually make final root query (to retrieve namespace,title):
$rootid = $rootSegmentNumber;
$qobj = $this->querySegmentList[$rootSegmentNumber];
$qobj->components = [ $qid => "$qobj->alias.smw_id" ];
$qobj->sortfields = $this->querySegmentList[$qid]->sortfields;
$this->querySegmentListBuilder->addQuerySegment( $qobj );
} else { // not such a common case, but worth avoiding the additional inner join:
$rootid = $qid;
}
$this->orderCondition->setSortKeys(
$this->sortKeys
);
// Include order conditions (may extend query if needed for sorting):
$this->querySegmentList = $this->orderCondition->apply(
$rootid
);
$this->sortKeys = $this->orderCondition->getSortKeys();
$this->errors = $this->orderCondition->getErrors();
return $rootid;
}
}
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